Allis-Chalmers 20-35 Test 151

University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln

Tractor Test and Power Museum, The Lester F. Tractor Maintenance Repair and Restoration Larsen

January 1928

Allis-Chalmers 20-35 Test 151

Tractor Museum University of Nebraska-Lincoln, [email protected]

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Museum, Tractor, "Allis-Chalmers 20-35 Test 151" (1928). Tractor Maintenance Repair and Restoration. 5. https://digitalcommons.unl.edu/tractorpower/5

This Article is brought to you for free and open access by the Tractor Test and Power Museum, The Lester F. Larsen at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Tractor Maintenance Repair and Restoration by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. -c The Allis-Chalmers 20-35 Tractor Here is the best tractor Allis-Chalmers The operator's seat has been brought has ever built, a powerful a -plow machine, forward and raised, so he has a clear, un ­ with a rated horsepower of 20·35, selling as obst ru ct ed view of the furrow wheel. the lowest priced a-plow tractor in the world. The tractor has more drop-forgings by far This tractor has been developed and per­ than it has ever had before. These mea n fected until it is the outstanding unit on the added strength and longer life. T he motor market today.Many new accessories have is fully sealed against dirt getting in through been adopted as standard equipment and the air, the fuel or t he oil. many refinements were made to add to its For the major jobs on a fann-plowing, life and increase its efficiency. threshing or the exceedingly heavy work of Not a single detail has been overlooked in combining there is not a tractor in its power consideration of the work it must perform. class which can compare with the tractor Take, for example, the muffler and spark for power, handling ease and ability to arrester which will prevent many grain fires. stand-up under hard service.

4 "Power and Profit with Allis-Chalmer s ZO- 35 Tr actors " AU.IS-CHAI1MERS... _ ....C20-3?>. • TnACTORS• r

Built for Hard Work From wheel to pulley the tractor is de­ lator, a double-action air cleaner, a spark­ signed and developed t o use its tremendous arrest er muffier and many other accessories power without overloading. The crank­ as standard equipment. shaft, the gears, the valves, the pistons ­ We recommend that. with proper cafe everything is built t o take the full load with­ and cleaning of the Oil PurOlator, you can out .overst raining and weakening any part. run the tractor for 100 hours without chang­ There is power to plow with four 14" ing oil. At the present cost of oil the saving moldboard plows, to pull a 32·inch separa­ here alone, compared with other tractors, tor with all attachments, to operate a 16­ will pay for an Allis-Chalmers 20-35 in foot combine, a 10-foot one-way disc plow five years. or a a-row lister. The length of the life of every wearing The Allis-Chalmers 20·35 tractor is com­ part has been more than doubled by im­ plete, with nothing ext ra to buy. Every proving the design , the method of lubricat­ t ractor has the fuel strainer, the oil PurO- ing and the materials used.

"Po w er a n d Profit w i t h A l l is-C h a l me rs %0 - 3 5 Tr a ct or s " 5 Roomy and Comfortable Platform for Operator The Allis-Chalmers 20-35 Tractor has a can stand or sit as he d esires, always with platform which is especi ally d esigned to the control at his finger ti ps. make operation of the t ractor easy and con­ On the dash ahead of the operator the venient. A big , spring-mount ed seat is so cont rols for the governor and magneto are located that the operator has a clear view mounted. A gauge for registering the oil­ of the furrow wheel and is also close t o the pressure is also placed here, so the operator control levers. can keep close check on the pressure lubri­ There are only two levers - one for gear cating syst em. shift ing, the ot her for the clutch . As an A steel tool box is provided on the plat- added safety factor a foot brake is provided. form. This is wa terproof and can be This is so sensitive and positive that a slight locked. tou ch holds the t ractor on the steepest Everything is simple and handy. To grades. operat e an Allis-Chalmers 20-35 Tractor The operator has plenty of leg-room. He from this platform is fun - not workl fj "P ow er a n d Profit with A l lis-C ha lm e rs %0-35 T ractor s" Husky Drawbar for Heavy Loads T he full power of the Allis-Chalmers serving as a guide for t he sidewise move­ 20-35 Tractor is carried throu gh the draw­ ment of the drawbar, when necessary. bar to the plow, combine or other implement The drawbar on the Allis-Chalmers 20-35 which is being used. Therefore. it is essen­ is simple in d esign and const ruction, but tial that the drawbar be strong, well-built exceedingly strong and efficient. The loads and so d esigned that it can be readily are transmitted equally over a big surface reached and attached. and there is no one particular spot which A heavy l ' x 3' st eel bar is securely carries the brunt of the burden. Longer pivot ed on t he tractor frame and it is so life is therefore assured for all of the parts, located that the full power of the tractor is and also for the tractor it self. transmitted t hrough it without loss. Many t est s were made before this design Supporting the drawbar and taking all and const ruction was adopted and since of the upward or downward thrusts is a then it has proven its worth in practical 272' steel angle, wit h a %" x 27'2 '" bar service.

" P o we r and Pro fit w ith Allis- Ch a lmer s 20 -35 Tr a ctors " 7 •

Short Turning Radius With a short turning radius the Allis­ The steering wheel is big and conveniently Chalmers 20-35 T ractor can be used almost located. so the operator can st eer with a anywhere. The ext reme outside radius is minimum amount of effort. This ease of 15 feet 5 inches and the inside radius is handling, t he speed with which the tractor 7 feet 3Y2 inches when making a short turn. responds to a touch on the lever, and its The drawbar is so const ructed that it can ability to maneuver in narrow places makes swing in back of the tract or t o carry t he it ideal for any job, whet her on the belt implement on an ext remely short radius, when necessary . T his is particularly valu­ or drawbar. able when operating a disc-harrow, a com­ T his feature of the Allis-Chalmers 20-35 bine or a similar clumsy, hard-turning T ractor is worth special consideration when implement . There is no ext ra length or determining t he Qualifications of the ma­ width than is necessary t o make a well­ chine for your farm . It enables you to use balanced powerful tractor which should tum more land for actual farming and this, of in as small a circle as possible. course, is profitable for you.

8 II P o w er and Pr o f it w ith Allis- C h a lm er s 2 0 -35 Tr actor s " Clear, Unobstructed View of Furrow Wheel from Operator's Seat From the operator's sea t on the Allis­ Most import ant . perhaps, is t he fact that Chalmers 20-35 Tractor , he commands a when t he operator has this accu rat e control clear view of the furrow-wheel. He can more and can see exactly wh ere he is going the accurately cont rol the tractor and a clean, speed is usually increased. It's safe to go even job of plowing is sure to result. faster when there is full visibility. The seat has been set up high t o give the Less room is required for turning with opera tor this advantage and he also has a this construction and so more land is avail­ clean, well-proportioned hood ahead of him able for straigh t plowing, instead of a bi g to sight along. These things can't help but head-land being necessary. affect the Quality of workmanship which is These are all benefit s which result because turned out . and they explain why the work of the features offered in the Allis-Chalmers don e with the Allis-Chalmers 20-35 Tractor 20·35 Tractor. T hey are all given as standard is uniformly much better than the average. equipment. No extra cha rge for any ofthem.

"P o w er a nd P r o fi t wit h A t t i s s C h e t m e r e 20- 35 Trac t o r s" 9 n 1 • ...... , . • ,··'1 ~. "",!II ....'''" \ 111<1, ALL!5· CHA'l!!MERS QO-;] TnACTORS

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Steel Wheel Equipment

T he steel wheels on the Allis-Chalmers formed by bending the tire. With this rim 20·35 Tractor are built by nationally known the wheels cannot cut into the soil and manufacturers of industrial wheel equip­ leave deep tracks. Holes are spaced on the ment. They represent the result of years rear wheels to fit any desired lug or cleat of development in the attempt to secure equipment . exactly t he right wheel for tract or con­ When wid er wheels are required, exten­ stru ction. sion rims are furnished as shown in the These wheels are exceptionally strong and picture. These are quickly attached and yet light, so their weight will not pack the have hole spacing for any desired equipment. soil. The spokes are hot riveted to the tires The front wheels are 36' diameter by 6' and hubs so t hat a very powerful joint is wide, and the rear wheels are 50' diameter made which will not be loosened by st rains by 12" wide. T he wheels are good-looking, and jars. substantial and add a finished appearance A heavy protecting and reinforcing rim is to t he Allis-Chalmers 20-35 T ractor.

10 "P ow f!r and Pr o fit w ith Al t l e c Ch e l m e r s 2 0 -35 Tractor s " Maximum Traction in Any Soil

As standard equipment every Allis-Chal­ The lugs are scient ifically designed to fit mers 20-35 T ractor is supplied with a on t he wheel s and get the maximum traction complete set of front-wheel guide rims and efficiency. Each lug has a forged knob either angle-cleats or spade lugs for t he which fits int o a hole on the wheel and pre­ rear wheels. vents it from turning or twisting loose. The angle cleats are 3.K· x 3 ~ · x 18' in size and trimmed to fit on the wheels so that the greatest efficiency in traction will These Allis -Chalmers result. lu gs a re shaped an d Ifangle cleats are not desired we supply a pitched so the wheel will complete set of spade lugs. T hese lugs are not clog readily. A spe­ drop-forged. making the st rongest lug on the cial spacing arra ngement market. T here is no argument about t he on t he wheels assures the superior strengt h and lon ger-life of a forging Forged desired results for any over a casting. Steel Spade Lug. kind of soil.

" P o w e r a n d P r o f i t with Alli s -Cha l mer s 2 0 -35 Tr a ctors " 11

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Comfortable Clearance for All Jobs

One of the noticeable charact erist ics of inspection plates have been provided to the Allis-Chalmers 20-35 Tractor is the reach the clutch, the connecting rods, main ample room which has been allowed for bearings and ot her parts which need an work on the tractor and with it. occasional once-over. Everything is accessible, easy-to-reach , The tractor is fitted with Alemite-Zerk with plenty of room t o spare. When thresh­ fittin gs for pressure greasing and all of them ing, or doing any other belt work, for in­ have been so arranged and placed that they stance. there should be lots of room for the can be reach ed easily and conveniently. belt. both around the pulley and between This is a fea ture of the Allis-Chalmers , the front wh eel and radiator. 20-35 Tractor which is worth a great deal You will see from the picture that there is a in the saving of tim e and t emper. A machine liberal 14 inches of space between the wheel which makes it as easy as possible usually rim and the radiator. Plenty for any beltI receives better care and attention. This, at This idea of easy-to-reach has been carried any rate, has been the experience of out in the motor construction. Big, roomy hundreds of Allis-Chalmers Tractor owners.

12 " P o w e r a n d Profit with All; fj ·Chalmers 2 0 -35 Tractors " Substantial, Easv-To-Rcach Belt Pulley For the innumerable jobs where belt the nut safely locked by a cotter, t o t he power is required. more especi ally for belt pulley shaft. threshing, some m eans of getting the power T he material used from t he tractor is necessary. On the Allis­ ~ in making the pulley Chalmers 20-35 Tractor this problem has , been met with the pres ent, very satisfactory ,.j is high -g ra d e cast installation of the belt -pulley. iron. It is ca refully From the opera tor's seat, he can easily machined to a 13" . line-up the belt. due t o the location of the '- diameter. and has an pulley. T here is plenty of room all around ~ 872· wid e crowned t he pulley, for slipping on or off the belt. ,"- face. T he speed of T here is no danger of a wobbling, out -of t he belt pulley is 930 true pulley on this tractor. because of the I r.p.m .• the same as secure manner in which it is fast ened on t he the motor speed un­ shaft. The pulley is keyed and bolted, with der full load.

" P o we r a n d Pr o f it w i t h A l li8 -C ha l m e r s 2 0 -35 Tr a c tor s " ]3 ALL!S- CID\:r:MERS QO-?>5 TRACTORS

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A Perfected Cooling System

If we ever cared to boast about any The radiator is the fin-and-tu be type, particular detail of this tractor's perfonn­ especially designed wit h long oval tubes anee it would be the cooling system. Never, which prevent any danger of a broken to our knowledge, has there ever been a bit radiator should the water ever freeze. of trouble with an Allis-Chalmers 20-35 Tractor overheating, or consuming too The radiator shell is of high quality cast much water. In fact, it is commonly said iron, very durable. It gives the tractor the that a man ca n drink more water t han his touch ofa well-built, modem machine, with A-C \\-ill use all day. its curved lines and finished appearance. A p ump circulates the water freely E ven the little things haven't been for­ through the radiator and around the motor. gotten, for the radiator opening is large and The water jacket thorou ghly encircles the oval shaped. Water can be poured directly cylinders providing a large cooling area . from the pail wit hout slopping over, it 's The capacity of the system is 10 gallons . not necessary to use a funnel.

14 " Power a nd Pr o f it w i t h A ll i s - C halme rs 2 0 -35 T rac to rs "

- Powerful Front-End Construction

The three-point suspension as used on spind les. and these forgings are necessary to the Allis-Chalmers 20·35 Tractor, t ogether st and up und er the severe work. with the construction shown above, con­ The front wheels tum on Timken Roller stitute one of the strongest and best Bearings whi ch mean easy turning and balanced front axle design s on the tractor smooth running. Ample means have been market today. provided for greasing the wheels and The axle is a drop-forging. E verybody is spindles through grease gun fittings. Dust familiar with the tremendous strength of and dirt are sealed out of the moving parts forgings and this should be a big deciding by a felt retainer. factor in favor of Allis-Chalmers. This front -wheel and axle construction is The front wheel spind les. on which the fool-proof. The average fanner who greases wheels are fastened, are also drop-forgings. and oils regularly can just forget about his Perhaps nowhere on a tractor is there so spindles and front-end as far as trouble is much strain , twisting and effort as on these concerned.

"Powe r a nd Profit wi t h A l l is·Cha / me rs 20 -35 T rac tors" J5 I

Drop-Forged Front Wheel Spindles

T o emphasize the strength and heavy­ 20-35 T ractor tum on Timken tapered roller duty construction ofthe front wheel spindles bearings, with adjustment provided to take used on the Allis-Chalmers 20-35 Tractor up any possible wear. A felt ret ainer ring t his picture is shown wit h t he wheel removed. prevents any grease from splashing out and Notice, particularly , the liberal dimension s a nut with shims t akes care of t he take-up of this spindle - how strong and well-built if necessary. it appears. The front wheels have an Alemite-Zerk T he spindles are pounded and shaped fitting on the hub in a very accessible place, from one piece of steel und er the t remend­ so lubrication is easy. This t ype of spindle ous blows of a steam hammer . After forging construct ion is the result of careful design they are carefully machined and ground to and t esting in the laboratories and in t he the req uired size. field . J ust another reason for the long-life The fron t wheels on the Allis-Chalmers of the Allis-Chalmers 20-35 T ractor.

1& " P o w e r and Profit with Allis-Chalmers 2 0 -35 Tr a ctor s " 1

The Backbone of the Tractor

A tractor. like a hou se, is only as good as there is no danger of twists and strains t o its foundation and this "master-casting" for throw them out of alignment. the Allis-Chalmers 20-35 Tractor serves The transmission assem bly is all con­ that purpose. It makes this tractor a t ained in this "master -casting" and it is single unit instead of being built-up as the well protected by the heavy walls. The ordinary bol ted, channel-frame type of clutch is also contained here. construction. The wheels ere assembled t o this " mast er­ More than any ot her feat ure of the Allis­ casting" and it also holds the fuel tank and Chalmers 20·35 Tractor, this particular one serves as a platform. The material used in is mainly responsible for its long, trouble­ the const ruction of the "mast er-casting" is free life. a very high -grade gray iron, cast in our own foundry and carefully sand-blasted. Ma­ Every gear must line up exact ly right, chining is done on aut omat ic machines. every bearing mu st have a perfect fit and Every one is perfect and uniform.

" P o w e r and Profit with Allis-Chalmers 20 -3 5 T ractors" 17 Section View ofTransmission and Main Drive To give a clear picture of the substantial spection plates are easily removed and t here construction of t he transmission and main is lots of space for adjustment or inspection . drive of the Allis-Chalmers 20-35 Tractor we have here t aken a horizontal section Cork gaskets and packing rings are used directly through the center of the wheels. so oil leakage will not occur. All of the transmission gears, the differential, and the You will notice. particularly, the roller drive gears run in a continuou s bath of oil. bearing supports for the shafts. T he clutch Seven gallons of oil are used to fill trans­ shaft is mounted on ball-bearings. whi ch mission case. experience has shown are better fitted for I that particular job. Timken Roller Bear­ The operation of the transmission and ings are used for the spline sha ft, the better drive on the Allis-Chalmers 20-35 Tractor to take care of end thrust. is positive and quiet. There is very little Every moving part in the transmission friction and the moving parts have long and drive is easy to reach. Big, roomy in- life as a result.

18 "Power and Profit with Al t i e s Ch e t m e r s 2 0 -3 5 Tractor s " ALl;IS-CHA:I:MERS GlO-Y> T nACTORS , "

Under the Transmission Cover

T he transmission of the Allis-Chalmers A big advantage of the transmission on 20-35 Tractor is similar to that of an auto­ the Allis-Chalmers 20-35 Tractor is the mobile. T he sliding gear type is used with fact that it is easy to get at . A large cover two speeds forward and one reverse. Shift­ is quickly removed and the gearing is ing is easy and quiet. There is no clashing completely exposed. If necessary. aU gears of gears. can be removed through the opening without The gears in the transmission are all disturbing the remainder of the tractor. forged st eel with machine cut teeth. Aft er machining, they are heat -t reat ed t o give Roller Bearings are used for the main them the greatest possible strength. Then, bearings in the transmission . AU gea rs are t hey are hardened t o t he point where a file constantly running in grease and the t rans­ will not scratch t hem. All ext ra margins of mission is nat urally very quiet and free safety and strength I from friction and wea r.

U P o w e r a nd P r o f it wi t h A l lis-C halmers ZO-35 Trac to rs" 19 Driving the Rear Wheels

The full power of the motor is t rans­ any other, chiefly in the fact that a " live" mitted to the drive wheels of the Allis­ axle is not used. The axle serves one func­ Chalmers 20-35 Tractor t hrou gh gears which tion only . that of carrying the load of the are constantly running in a bath of oil. tractor. All are fully enclosed. The mat erial used for the bull-gear on the The power is directly applied to the rear wheels is of the highest grade of iron. It is wheels through a forged pinion , with continually being analyzed and tested after machine-cut teeth, which drives an internal each ladle of iron is poured, so that no in ­ I gear securely bolted to the wheel. ferior grade will ever be used in this con­ This gearing is kept constantly lubricated struction. in the oil-tight case. A felt retainer prevents The design has been t ried and tested oil or grease from splashing out over t he thorou ghly for many years and thousands rear wheels. of Allis-Chalmers Tractor owners heartily This drive has several advantages over endorse it.

20 " Powe r a n d Pr o fit w i t h Al t i e s C h e t m e r s ZO-3 S Tract o rs " 'I

Three Main Bearings

Three big, oversize main-bearings support main-bearing is 4%" lon g and t he center the crankshaft in t he Allis-Chalmers Trac­ and front main-bearings are each 4" long, tor. Each of these bearings is provided with making a total of 12%· of main bearing four big studs, making the strongest main­ surface. Connecting rod bearings are 3.!4" /I bearing const ruction that can be built in long. 8 tractor. In order t o increase the long-life of the On the A-C T ractor the main-bearings bearings a gear-driven pump provides fresh are bronze-backed. This is the same material oil continuously at a pressure of 20 to 35 that is used in the bearings of well-known pounds to the SQuare inch on all bearings. automobiles which have been t ried and This crankshaft and bearing construction tested for years and years. is the most important part of any t ractor. • T he crankshaft on the A-C Tractor is Too much st ress cannot be laid on the power­ 2 ~ · in diameter. It is a drop-forging, care­ ful, heavy-duty construction which is built fully machined and balanced, so that it into this vital part of every Allis-Chalmers runs absolutely true and even. The rear Tractor.

" P o we r an d Pr ofit wi t h A l l is- C h a l me rs 20-35 Trac tors " 11 Better Farming, Faster and Cheaper The owner of an Allis-Chalmers 20·35 ing an extra furrow free since the A-C tractor soon finds that he can do all kinds 20-35 sells for the same price as most 3­ of work faster and more profitably t han plow tractors. with any ot her method or machine. It is Most farmers are no lon ger satisfied built to suit the condit ion for any farm, with listing three rows when four or even soil or work, especially where the going five can be list ed with the A-C. Instead is heavy. of a 24-inch separator they use a 30 or It is just as easy to pull a 4-bottom 32-inch size and cut a 16 foot swath with moldboard plow as a 3-bottom plow, giv- a combine instead of a 10 or 12 foot swath.

I- Here's an extra fur row free. Plowing with a 4-bottom 14· moldboard plow at a depth of 8· in heavy soil. 2-PuIling a 10 It. one-way disc plow in ha rd gumbo soil. Doing twi ce the 'NOI' k in half the time. 3-<>ne more than we recommend, but this 5-row lister. being pulled wit h an A-C 20·35. gives an additional furrow. 4- Using a 10 ft . binder with the power take-off' on the tractor.Wet grain and soft ground. yet the job was easy. 5-A 16 ft . combine, with a 15 bushel grain bin and an A-C 20-35 is a sure way to harvest profits. &--Constructing a gravel road with an 8 ft. grader. T his work takes power - lots of it.

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F'= Profitable Power for Every Job Figure the time that can be saved when wat er or doing other jobs where plenty it is possible t o hit ch several implements of belt power is needed. in tandem and do the work of many The Allis-Chalmers 20-35 tractor is an hours in one hour. economical tractor t o run and maintain. There is profit in doing all kinds of Accurate governor control while operating ot her work, after the field work has been assures economy in the use of fuel. T he finished. Many dollars of additional profit design, construction and careful testing can be earned by building or grading roads are all aimed to give more than double by sawing wood, stacking hay. pumping the service of t he average tractor.

7-The cost of t he harvest determines the profit . T he A-C 20-35 cooperates wit h smoot h power for a big 32 · separator, working to full capacity. 8-Not to fly, but to make flying easier, this A·C 20-35 is usa! for maintenance work on an airport, 9-Doing t he work of a dozen horses with this com bination of drag-harrows. IG--Stackin g 300 ton s of hay and never using over 10 gallons of fuel per day as this A·C 20·35 is doing, is worthy of mention. 11-&wing is a profitable part-time business if you have the saw and t he power, The A-C 20·35 is pulling a 50-inch saw thru thick and t hin here. 12- Road maintenance work in your townsh ip is going to pay somebody a profit. The power of an A·C 20-35 is needed to pull this grader. Pressure Type Lubrication System

Lubricat ion of the Allis-Chalmers 20-35 The oil is lead to the main bearings, and Tractor motor is done automat ically by the then through a drilled hole in the crankshaft pressure type lubrication system. It is only to the connect ing rod bearings, up the con­ necessary t o put oil in the crankcase. A necting rods and along the pist on pins, gear-driven pump for ces the oil from the do wn the cylinder walls. The oil is com­ reservoir in the crankcase under pressure plet ely cleaned once every 4 minutes, or 15 to all main bearings, connect ing rod bearings t imes an hour by the Oil PurOlator. With and piston pins. proper care we recommend the oil for 100 Every moving part in the motor is thor­ hours of opera tion, wit hout change. oughly lubricat ed with this system . One of Any ot her type of lubrication, other than the noteworthy features of this t ractor is the pressure system, for a modern tractor the fact that even the rocker arms are lubri­ motor is out-of-date and inefficient. The • cated by a lead from the pressure system, modern farmer will n ever be sat isfied wit h supplying enough oil to keep these parts anyt hin g less while Allis-Chalmers offers it running smooth and requiring no attention. as standard equipment.

24 " P o w e r a nd Profit w ith A llis-Chalm er s 20- 35 Tra ctor s "

, AtLI S 'GHA~ME R S ~ O ·;)~ :YUACTO RS

Three-Bearing, High-Grade Steel Crankshaft A motor without a good crankshaft is The three-bearing type of cranksha ft worse than useless. T o design and build a support is used because of the great er crankshaft that would be stronger than the smoothness and strength.A total of 12%' strongest part of the motor has always been of main -bearing surface supports this shaft the aim of Allis-Chalmers engineers. and there is no possibility of bending or This crankshaft is a d rop-forging mad e warping under heavy loads. of high-g rade steel. T he st rongest kind of The bearing su rfaces on the shaft are ca re­ metal has been combined wit h the strong­ fully ground. Oil is supplied to these sur­ est possible way of manufacture. faces under pressure through a drilled hole Besides st rength, Allis-Chalmers engineers in t he crankshaft . had to figure on balance, on smoot hness in On each end of the crankshaft special operation. Therefore, every Allis-Chalmers grooves are turned . These tum in felt crankshaft is carefully balanced , so it will retainers in the crankcase and prevent oil tum absolutely uniformly in the bearings. from splashing out .

" P o w e r a n d Pr o f it with A l li s -C ha lm er s 2 0 -35 T rac to r s " 25 Main and Connecting Rod Bearings

Bearings are to a motor what wings are to In designing these bearings the propor­ a bird . Of utmost importance, because tions were made very liberal and there is an they so vitally affect smoot h, economical ext ra margin of safety in every one. operat ion, every effort was spent on their design and construction. If it is ever necessary to reline or scrape the bearings, the shell-type of const ruction On the Allis-Chalmers 20-35 Tractor the makes them easily removable. main and connecting rod bearings are bronze backed. Each bearing is lined with high­ The rear main-bearing is 4%,'" long, and grade babbitt, carefully finished. the center and front main-bearings are each The bearings are grooved, so the oil from 4" long, making a total of 12% ' of main thepressure system can thoroughly cover and bearing surface. Connecting rod bearings penetrate every part of the bearing surface. are 3ra ll" long.

26 " P o we r and Pro fit w i t h Allis-Chalm er s ZO-3 5 Tracto r s " Connecting Rods and Pistons

The connecting rods used on t he Allis­ shims. T hese bearings are lubricat ed by Chalmers 20 ~3 5 T ractor are exceedingly pressure, the oil being brought through the strong and well-con structed to handle the drilled crankshaft. heavy loads of tractor operation. The connecting rod s are drop-forged with Quality Pistons Lbeam sections, the strongest sections which A light cast iron piston is used , so de­ can be used for that work. Each rod is signed that it has great st rength. Four heat-treated to further strengthen it. U' cast iron rings are on each piston. The The upper end of the rod is bored for the piston pin is tight in the piston and mov es piston pin bushing. The connecting rod in the bronze bushing in the connecting rod . bearings at the lower end are bronze-backed, A hollow steel tube carries the oil to the babbitt-lined. and can be easily replaced . piston pin, providing full lubrication to all T hey are adjustable by means of laminated the moving parts.

"Power and Profit wit h Allh-Cha lmer. ZO -J5 T rac tor." 27 ALLIS -CHAI!MERS QO -Y> T n A CTOn S!

Removable Cylinder Sleeves

Allis-Chalmers first designed a mot or T he cylinder sleeves are made of a special that ranks with the best in modem con­ cylinder iron with a percentage of nickel. struction practice. As an added. final twice as hard as ordinary iron . This is the precaution against trouble every 20-35 same material which Allis-Chalmers has Tractor motor is equipped with removable been using for cylinder walls in big Corliss cylinder sleeves. engines for years and years. The surface of the cylinders is absolutely smooth and flaw­ These sleeves are set in the block and less, like a mi rror. should any cylinder wall be damaged through accident or neglect it is not neces­ With the pressure lubricating syst em the sary to take the motor to a cylinder-grinding cylinder walls are always supplied with shop-simply replace the worn sleeves with plenty of clean oil, so t here is no danger of new ones. The mo tor is renewed, at a very scored cylinders or damaged walls from nominal charge. t his source.

28 " P o w e r and Pro fit with Al l i s -C ha lmer s 20- 35 Trac tor s "

- ALLIS-CHA:LMERS Cl O-Y'i TRACTORS . . - . ,

Camshaft and Valves Upon t he efficient operation of t he cam­ sect ion throu gh the cylinder head shown shaft and the valves t here is a great d eal above will clearly indicate t hat Allis-Chal­ dependent and Allis-C halmers engineers mers gets extremely close to t he head with have given much thought and work to t heir the cooling water. This water jacket com ­ development. pletely encircles each valve head. absolutely Low-carbon steel drop-forging is used for preventing a hot-spot. the camshaft. with the cams machined as Allis-Chalmers uses a special si1crome integral parts of the shaft . The camshaft metal for t he valves. The overhead valve is case-hardened and ground, so the surfaces system is standard on the 20·35 tractor. are smooth and exceed ingly hard. The valves are 2· diameter, readily accessi­ The bearings supportin g the camshaft ble for grinding by removing the head. are automatically lubricated and the opera­ Mushroom type tappets are used. of tion of this ph ase of the motor is very quiet. ample size to suit the exacting conditions Valves are subject to much heat and the which are imposed upon tractor motors.

" P o w e r and Profit with All i 8 ~Cha/mer s ZO-35 Tr actor s " 29 ••• R ALuS- CI-m lo:MERS QO-::':; TnACTORS

Taking Out the Dangerous Vapors With the development and design of a vapors away, as shown by the arrows. new type valve cover, Allis-Chalmers has I t had formerly been the common prac­ made a valuable contribution toward the tice to have the breather in a pipe on the solution of a problem with which every crankcase. This pipe was filled with hair and motor manufacturer has had to cont end. it was found that the cond ensation from the When gasoline is burned in an engine, vapors would cling to the walls of the pipe water is produced in the fonn of st eam . This, and be washed into the crankcase. t ogether with other vapors must be taken This danger is now ent irely eliminated, for out of the crankcase. or dil ution of the motor there is no possibility of anything being oil when the vapor condenses will occur. washed downward with this type of brea ther H ere on the Allis-Chalmers 20-35 Tractor construction. a special breather has been developed . so This view of the valve cover also shows that vapors arising from the crankcase must the trough which carries the oil t o the rocker pass throu gh a space filled wit h hair. T his arms. You will note t hat t he cover is easily breat her is so located that a direct flow of removed by loosening the wing nuts which air from the fan forms a suction which carries bolt it to the cylinder head.

30 "Pow er a nd P rof i t w it h A lli s -Ch almer s 2 0- 35 Tra cto r s " ... .. '• " ., , I GlO·M TRACTORS

Expanding Shoe Type Clutch

Here is a simple clutch, made very dur­ If slippage ever occurs, a slight adjust­ able and designed to be free from trouble. ment on the tum-buckle brings both shoes This Allis-Chalmers Clutch is in daily use out to the correct position for smooth. yet on thousands of tractors and there is never gripping contact. a word of complaint from owners. Only the highest-grade materials are used T he clutch is housed in t he "master-cast­ in the manufacture of this clutch. Linings ing," where it is free from dust and dirt. are made of woven Raybestos, which tests Convenient inspection plates make it easy and long use have shown to be without an to reach and inspect. The shoes can be equal for tractor operation. removed for relining in fifteen minutes. T he Allis-Chalmers clutch is sensitive and Lubrication for the moving parts is pro­ positive in its operation.A slight touch on vided by a grease-gun connection, which is the shifting lever engages or disengages easily reached throu gh t he inspection hole. the clutch.

" P o we r a nd Pr o f it with A l l is-C ha l me rs 2 0-35 Tra cto r s " 31 ALLIS-CHfX:L:MERS QO-Yj TRACTORS

Every Tractor on a Triple Test

Before the Allis-Chalmers 20-35 T ractor laboratories and t est rooms where new de­ is sold it must successfully pass three severe vices and method s are constant ly being tests. These t ests are made by three tried out. Every metal used in the con­ different men at different times. struction of an Allis-Chalmers 20·35 Tractor H ere is a picture of the tractor motor on is analyzed and tested frequently to guard an electrical t esting machine, wh ere it stays against flaws and weaknesses. over four hours. The horsepower is ac­ F ield t ests are made with finished tractors curately measured and recorded.I t must under condit ions far mor e severe than the develop at lea st 43 horsepower. a reserve of average tractor will ever meet. Weakness 8 horsepower over the rated 35 on the belt. in design or construction is overcome here, T hese ext ra margins of power prot ect us before it goes on the market. and protect the customer. These t ests are your protection against Besides the motor tests shown in the grief and breakdowns. They insure your suc ­ picture Allis-Chalmers maintains special cess with the Allis-Chalmers 20-35 Tractor.

32 "Power and P r o f it w ith Allis-Ch almers 20 ·35 Tracto rs" I I

The Allis-Chalmers Governor The function of a gov ernor is primarily running in oil, so there is no danger of wear that of giving positive control of the motor. in the moving parts. On a tractor it is necessary that a uniform A particular ad vantage of this type of and constant speed be maintained for draw­ governor construction is the fact that bar and belt work. This governor was specially designed by our engineers for the Allis-Chalmers 20-35 Tractor t o meet the problems of a constant speed at all times. The range of the gover­ nor had t o be great enough t o insure this, whether operating under full load or run­ c ning idle. Section Th...... ,h Go.~Showlnc Mecha....rn . The Allis-Chalmers governor is simple in variable speeds are controlled from the design. There are few moving parts, and it is dash . This permits a wid e range of speed figured of ample size for extreme conditions. for the fun load, yet it does it sa fely under The governor is fully enclosed and is governor control constantly.

"Powe r and Profit with A ll is -Cha lmers 20- 35 Tractors" 33 High Tension Type Magneto

The Eisemann Magneto has acquired a Magneto is the fact that it has a variable world-wid e reputation for being a quality spark cont rol. The ignition is cut out by product and some of the best-known auto­ simply moving the timing lever to the motive manufacturers areusingit exclusively. ext reme retard position. It was adopted as st andard equipment on With this arrangement a great deal of the Allis-Chalmers 20-35 Tractor after prac­ unnecessary wiring is eliminat ed, and the ti cally every other type had been thoroughly tractor has a neat. clean-cut appearance, t est ed. instead of the usual mess of wires and rods This magneto is equipped wit h an impulse found around the magneto. start er in a dust-proof housing . Starting is The Eisemann Magneto is entirely water­ easy and there is no danger of back -firin g proof and weather cannot short-circuit or with this unit . damage it. Magneto trouble is unknown Anot her desirable feature ofthe Eisemann with the Allis-Chalmers 20-35 Tractor.

34 u P o w e r and Pro fit wit h Al l i s-Ch alm er s 2 0 - 3 5 Tr ac t or s " I ~

Adjustable Roller-Bearing Fan

As important as any other d etail of the fan turns on Timken Roller Bea rings. which Allis-Chalmers 20-35 Tractor is the fan. It assures smooth, noiseless and efficient opera­ has a big part in the job of keeping this tion. Provision is made to lubricate these tractor from ov erheating. bearings and a take-up is provided for wea r. During the hot days of harvest, wh en The fan is adjustable for any st retch t hat threshin g or pulling a combine, the demands may take place in the belt. This adj ustment on a tractor are heavy and it is a big t ribute is very easily made by loosening a set -screw to the design and construction of this fan and turning the eccentric on which t he fan that on hundreds and hundreds of tractors is mount ed. there has never been a bitofworry or trouble T he belt used on the Allis-Chalmers 20-35 with it. T ractor is of cord rubber, made by exactly The Allis-Chalmers fan has four blades, the same process as a cord t ire. The with a 22·inch diameter. The blad es are strengt h and long life of this material is removable and can be easily replaced . The too well known to stress here.

" Po we r a n d Pr o f it wi t h Alli .· Ch almer . %0 -35 T rac to r." 35 _. , QO·Y) TRA CTORS'

Watchman No.1-The Oil PurOlator A tractor must work under conditions on the outside, while the clean oil passes that are generally dusty and the dust finds from the inside of the filt er element t o the it s way into the oil, where it becomes a out let in the head. grinding compound that soon shortens the tractor's life. The Allis-Chalmers 20-35 is the first tractor to use the Oil PurOlator as standard equipment. It thoroughly cleans all the oil, in the lubricat ing system, once every 4 minutes. T he Oil PurOlator is really very simple T his Watchman is an amazing lengthener but remarkably efficient in its operation. A oftractor life. Engineers say it should more filter element is a rranged on a spring so than double the life of every Allis-Chalmers that all dirt, ca rbon and metal is deposited 20-35 Tractor.

36 " P o we r and Pr o fit with Alli s ~ Chalm e r8 20- 35 Tract or s " ALLIS-CHAI:MERS QO-::» TRACTORS

Watchman No.2 -The Air Cleaner Here is a double-duty wat chman with the sieve-like metal container. It is easy to very important job of keeping the air t hat clean, merely dousing it up and down in goes into an Allis-Chalmers 20-35 T ractor kerosene or gaso­ clean and free from dirt, dust and grit. line about on ce a It takes the air be fore it goes into the week do e s th e carburetor and gives it a double cleaning. trick. The first process is by centrifugal force, This double-ac­ where the air is whirled around violently , t ion air cleaner is, and the dirt is sucked into a removable glass without a doubt, jar, from where it can be empt ied. the most effective The second cleaning process takes place and thoro u gh when the air is sucked throu gh an oil-soak­ cleaning device on ed. hair mattress through which it is im­ any tractor today. It has been thoroughly possible to get even very fine specks of dust. tried . t ested and found to be the best of This oil-soaked, hair mattress is in a any ever used on t he tractor before.

" P o w e r a n d P ro fit wi t h A l l i s -C ha l me rs 2 0 - 35 Tr acto rs " 37 Watchman No. 3-The Fuel Filter In keeping wit h the Allis-Chalmers policy dirt and grit which could enter it at this of constantly improving even t he smallest point . part of the tractor, your attention is drawn to the fuel filter which is standard equip ­ This filt er is directly below the fuel t ank, ment on every Allis-Chalmers 20·35 Tractor. at a place where it is easy to reach. A glass container is held finnly in place with The value of this watchman has been a wire loop. T his container can be taken proved by thorough tests by Allis-Chalmers off and cleaned in a minut e's time. tractor owners under all conditions. T here is no possibility of any leakage Any dirt that may be in the fuel itself, occurring on this container. as there is no Of in the fuel tanks. is collected in this opening in the bottom. filter. It cannot reach the carburetor, where it might interfere with the efficient A valve is provided so the fuel line can operation of the needle valve. The Allis­ be closed while the container is being re­ Chalmers mot or is securely sealed against moved.

38 " Po w e r a n d Pr ofit w it h A t t t s c Ch e t m e r e 20·3 $ T' r e c t o r e" 'I ~ljlI's " ! IC M iI! ME 'R "s l l l l l l l l '~o· , ' Il mnA€t0R s'I I I II I I" II," f ' ~' I.dl", Ultll, ""'"U"'I' 11 1111 "",,,I,,,,,,,II,,,,,,,,,,,,,,IIIIL"""'''''''''''''''',"' IlIb: " ,,,,,, ::>~ I 11 11,,, III ,,,,''."IIl,.II".ihh",III"WIIII,"'1I1 II

Worm Gear Type Steering Mechanism

The worm gear type was chosen for the worm and gear set is enclosed in an cil­ st eering mechanism on the Allis-Chalmers filled case, with plenty of lubrication pro­ 2 0~3 5 Tractor because it is the st rongest , vided for the thrust bearings on the worm most positi ve, easiest to operate and the by grease gun connections. safest type yet designed. E very man who Ii Six adjustment s are provided for has been in back of the wheel for 8 or 10 the worm gear, so hours at a st ret ch will appreciate this. that it can be turn­ The material used in the construction of e d around a n d this important partofthe tractor's opera tion used equally on all is the strongest it is possible to secure. The the teeth. This will worm gear is a drop-forging with machine prevent slack in cut and hardened teeth. The worm which the steering wheel. meshes with this is also made of the same Adjustments can also be easily made on the material and has machine-cut t eeth. The worm thrust bearing.

" P o w e r and Pr ofit with Allis-Chalm ers 20-35 Tr act ors " 39

• Ball-Jointed Connection for Easy Steering Every possible feature which could he consequently. this receives more wear than used to provide easier and more accurate the other parts. steering has been utilized on the Allis­ The ball-jointed connection as used on the Allis-Chalm ers 20-35 Tractor reduces It Chalmers 20-35 Tractor. was reali zed wear to a minimum and automatically that the job of driving a t ractor all day is, adjusts itself to take care of wear. The at best , not an easy one and the operator is spring exerts a constant. unifonn pressure entitled to anything which will make him against the "ban" and this tends to make more comfortable. the steering apparatus very sensitive and positive. When ruts, stones and holes are en ­ This is standard design, as used on high­ countered in the average field , the steering grade automobiles and in adopting it Allis­ mechanism is subject to severe shocks and Chalmers maintains the policy of consistent strains.T hese are particularly felt on t he improvement which has always marked jointed connections of the drag link and, their efforts.

40 " P o we r a n d Pr o fit with Al l i s c C h e l m e r s ZO- 3 5 Tr actor '" 0 , ~LI S -GHAl:ME" R S QO·Yj :TRACTORS •

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Power Take-off on Transmission A special power take-off has been de­ self is supported in a heavy cast-iron frame. signed to fit on the Allis-Chalmers 20-35 The normal speed of the t ake-off shaft Tractor for use with the binder. combine, is 542 R.P .M. P rovisions are made to pro­ corn binder and other implements requiring vide either 178' or 1%' diameter splines. power for t heir operation. T his is an unit depending on the requirements of the im­ fitting on the transmission case, taking the plements to be drawn. T he take-off shaft place of the regular cover. and becoming an end has S.A.E. standard 1% ' - 6B spline integral part of the tractor. which is provided with an extension having Power is secured from transmission gears a 178' - 6B spline, when required. and transmitted throu gh hardened steel T he t ake-off shaft is 34 34' from ground, bevel gears. T he unit is self-oiling, using t he 234' to t he left of cen te r of tractor. 1%" oil from t he t ransmission. The shafts tum on spline extends 2534" back of t ractor rear ball and roller bearings makin g a very quiet wheel center and 1.78 6 spline extends 30>1" and smoot h-running t ake-off. The unit it - back of t rac tor rear wheel cente r.

" Powe r a n d Pr o fit with A llis - C ha l mer s ZO-35 Tr a ct or s " 41 • . ~ MUS-CHALMERS' QO-;):) TnACTORS • Detailed Specifications of the Allis-Chalmers 20-35 Tractor

st eer-in& mechani!lfll and moving pam Iitted wit h Capacities- Alemite-Zerk Iittings for prea u.re k rc a~ i n g. Orea" The All is-C ha lmen 20-35 Tractor wiU handle gun pro vided. 4 · I" " plows , a 32" 8('fIarator. a 16' com bine, with Itrlin . a 10' one- way diee plow, a 4 row lister or Fuel Supply System- sm aller implement. in tandem . T ank with 32-gallon capacity, ~ ravity feed , pr o Drawbar Pull- vided with sediment trap. In lew Itear this tractor i. luaranteed to pull 3750 Carburetor- pound s and in hi &h lear it ", ill pull 2875 pounda. C...buretot of special design, 1 ~~ . Controlled by Tractor Speed- covernm. 2 }oS to 3 U mil" per hour. Speed il euiJy ronttolled Cooling System- and ~u1ated . Wat er , impeller pump: fin -and,-tube type radiator or hich coolin« effideney. Four-blade fan. 22" in Weight- diameter , Ca~ty 10 lallona. The net wei&ht of the trKtox is 6.000 pound•• Air Clean er- M otor- Speeial make. ealtrifuc al and oil filt et type, direct Own d...igD and m. kll'. four-ey lil>del'. wn er-cooled connected t o c::arburrtot. by pump circu lation. Bore. 4h-, Stroke 6 }i-, Di .pl .cem~ t 461 cubi c: incht'll. Ignition- Ei"'=ft\ann magneto with im pube . tarter . Motor Speed- Govemor- Under full load the mot or .pttd ;1 930 R.P.M. and Our own de .ign and m ak e. Very sen.it ive and po.i· i. under governor control. tive in action. C entrifugal type. Variable speed. Cylinders- Control- Removable cylinder .Iecv... set in the block. Made All necessary controls mounted on instrument board of cylinda- iron. twice as hard .1 ordinlory iron. within euy reach of the operator. Cylinden hu e a Clau-like fmith, IIDOOlh and a....la:. as • mi lTOr. Transrnission- Unit powe!' pl ant type• .e1ective .Mina: 2 apeecb Crankshaft- forward, 1 reverse, Oean of f<:qed ned -eeuratdy Thn,oe·bearint: type, -ecurat ely PlIIde and C*ld'ully cut and ahaped. Roller bearinp UKd fOf' maiD balanced. M llde of hich gnde rted. bearinp in tranamilSion. Front bcarini; H i - diamt'kl' Z 4 ~ ; (alta 2).i· Steering Gear- d iameter :II. 4 ~ ; re ar diameter :II. 4 ~~. Btonre­ Hi" lS~ b-cked. babbitt liDed, intucltangeable mainbearin&. Semi·nvenible type, diametet hand wheel . Very ea sy steering. T ake-up provided agaiDlt wear. Camshaft- Front Axle- Drop-fOl"'led eeeet, intq:ral Can'l*, cue hardened and. Own make, foq:ed eteet, I -beam Kctioa. Timlren &roun d. R oller Bearin&l on wheel . pindlea. Pi stons- Rear Axle- Ll&ht cut iron, 6 U"lon& with 4- 34"cu t ir on rinKI. Full floatin& type. M oun ted on roller bearingl. Pi .ton pin l ~· diameter, tl&ht in pi.ton. Connecting Rods- Wh eels- Steel wheda. F ront wh eeb 36~ dia met.et :II.6" wide: Drop-fora:ed, heat treated I -beam llection 13' 100&; rear wheels 50· d iamet.a- I: 12" wide. piflon pin bulhin& 1 }-S· diameter .. 2 ~ ~ , bronn. Connecting rod be arin&" broese-becked, babbitt· Turning Radius- lined. adj ustab le by meana of laminated ahima. 15'-5· extreme outside t umin c rad ius - 7'-3 J.i· Valves--> inlide radiu.a. Spec:lal sikrome metal. Aett$llible for &rindilli by Wheelbase­ r=lOving head. Diameter 2~. Overhead valve 9O~inehCL .ystem_ Am ple sin mush room type t appets. Belt PuJley- Lubrication System- 13~ diametet I: s ).i" wlde. Pr~ lubricatin& sys tem from geaNlriven pwnp to al l m ain bearing.. eonnectin& rod bNring. and Wheel Equipment- piston pins. R o<:ker tlrffi.I for valves lu brica ted by St.-ndard equ.ipment provides each trector with lead fro m preeeure ' YlIt em . Pressure &au&e ece­ fr ont-wheel guide rUn. and either angle-eleat. ot veniently located on inatrument board. All wheels, spad e IU&1 for the rear wheels. Tht AlIi.-Chalmt'TI ManUfacturing Companll rtrtrvt. the tight to makt changt. in pric" and ,pl'dficalions or add improvtmt nt. at any time without bf!iTIfJ obligl'd to install , ame on tractor, ptl'viou'/II .old.

42 " P o w e r and Prof i t wit h AIIi.·Cha lmer s ZO·3S T ractor s " ALLIS-CHACMERS G20·::>5 TRACTORS

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Builders of Power The Allis-Chalmers 20-35 T ractor is built years of rendering service to customers in a factory where every machine and every before the plant became it s present size. operation is concentrated on the job of Allis-Chalmers has over 170 acres of building power machinery. ground space, most of which is covered by Some 70 years ago when Allis-Chalmers buildings. There are 18 miles of railway started in business a definite policy of track around the plant. always making every prod uct the best it There is probably no other factory in the could be made was adopted. From that world better tooled and equipped to build time till now the policy has been rigidly a good tractor than Allis-Chalmers. Scores practiced and followed. of skilled engineers are employed, with experience as designers of power machinery. Allis-Chalmers has built some of the larg­ est power machinery ever made in the world. T he greatest and most satis factory thing They number among their satisfied cus­ that the purchaser of an Allis-Chalmers tomers many concerns who are known the 20-35 Tractor gets is the knowledge that he world over. is buying the best tractor that money, brains and machinery can produce and that The factory shown above was not built it is backed by t he reputation of a Company in a day. nor even a year. It required many which couldn't da re build it otherwise.

" P o w e r and Pr o/it with Allh-Ch alm er s %0 -3 5 Tr a ct or s " 43

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