Technical Manual Operator Handbook
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NSN 7610-66-145-3217 TECHNICAL MANUAL OPERATOR HANDBOOK TRUCK, WRECKER, MEDIUM, MC2 MERCEDES-BENZ UNIMOG U2450L NSN 2320-66-145-0422 (LIABILITY CODE No. 75005) Specification Army (Aust) 6620 AUTHORISED FOR USE WITHIN THE RlEN CSC AUSTRALIAN ARMY BY COMMAND OF THE CHIEF OF ARMY AMENDMENT RECORD SYNOPSIS The Truck, Wrecker, Medium MC2 with Crane is intended for the recovery of Truck Medium MC2, Truck Light MC2 and, Truck Lightweight MC2 vehicles. This includes assistance over difficult going, extrication of bogged equipment, battlefield clearance and backloading of equipment to repair facilities. WARNINGS WARNING At 8 pressure below 1.1 BAR (110 kP8) 8 tym can roll off the rim if the wheel is turned. WARNING 36,54,56,81,92,116 If the engine is switched off during winching opentlons the six-wheel bnke will release mdthe MRV may mow. WARNING When opnting with the PTO engaged, the main tnnsmksion shift lever must bo in the neutral position (7th - 8th gear), the forwardlnverse gear lever in the neutral position, and the splitter transmission in LOW mtlo. WARNING Braking efficiency is reduced when the engine brake is isolated from the service brake padal. The engine brakeisewice brake switch is only to be activated during testing of the service brakes. Do not disconnect the engine brake from the sewice brake pedal when driving on public roads. WARNING The MRV must not be driven if a bnke warning light or low air pressure warning light is operating. These warning devices indicate that the brake system is not functioning correctly. WARNING Do not operate the central tym inflation system when driving on public roads. Lowlunrven tyrt pressures make the MRV dimcult to control and dangerous in traffic. WARNING The refrigeration system components and copper pipework used in the air conditioning system are under high pressure and can cause serious injury if the air conditioning system is opened. The mfrigeration system components and copper pipoworlr contain liquid-vrpour mixtures under pressure, which on contact can freeze, and cold-bum human body tissue resulting in permanent damage. This damage can occur within l(one) second. If refrigerant does enter the eye, fmzing of the eye can occur and blindness could resuk WARNING When operating, the air conditioning system has several hot (> 60%) and cold (>S°C) areas. When working on the vehicle be welt aware of these areas to avoid injuries. WARNING Welding tasks are not to be performed on the refrigerant circuit or in the immediate vicinity. The refrigerant gas is non-tlammable, however ensure that them are no naked flames within the vicinity as toxic gas is produced when the refrigerant gas comes in contact with fire. WARNING 67 Do not ckan the air conditioning condenser with steam cleaning equipment, as the expansion of the refrigerant gas within, may cause excessively high pressures in the air conditioning system that may result in an explosion. WARNING 74 The maximum static load that can be placed on the side step Is 15Okg. WARNING 74 Ensure the side.rtep It stowed and the safety locking pin inserted before moving the MRV. WARNING 75 The air supply pressure at the tyn inflation point is unmonitored. Take can not to exceed the mcommended tyre pressure. Over inflation could result in tyn damagehlowout and injury to personnel. Ensum the accelerator pedal is not depmssed after the engine has been shut down as this action will release the positive engine stop allowing the engine to be roll started. WARNING Do not drive the MRV on a firm surface with the differential locks engaged as there is no differential operation between the whclals when cornering. This leads to increased tyre war, poor steering behaviour and severe loads being placed on drive line components. To prevent severe tyre vibration and possible loss of steering control remove all mud from the front wheels and tyms after cross country operation. WARNING When slave starting the MRV ensure that a 24V source is used and slave lead polarity connections are correct. Incorrect voltage or polarity connections myresult in battery explosion and injury to personnel. WARNING The MRV is equipped with six-wheel drive and differential locks. Do not attempt to apply drive to a wheel that has been jacked up off the ground if either six wheel drive or the differential locks are engaged. Serious injury to personnel and damage to the vehicle could result. WARNING Before changing a wheel secure the MRV to prevent movement. WARNING If 8 casualty MRV has no brakes, then it cannot be towed by another MRV on public road$. WARNING P~iorto mechanically releasing the park brakes the wheels must be chocked to prevent any movement of the MRV. WARNING Chock the whmk of the MRV to prevent it from rolling when the towing device is removed. WARNING When installing the batteries in the MRV ensure that connections with the battery leads an af the correct polarity i.e. (+) to (+) and (-) to (-). Incorrect polarity ~4#bnectionswill cause damage to the vcrhiclr electrical system and may result in battery explosion and injury to personnel. WARNING Do not stand in front of a tyrs whilst inflating it. WARNING 117 During all recovrw operations, take care in the presence of overhead power lines, WARNING Ensure personnel anclear before operating main boom. WARNING Keep clear of the main and folding boom when operating tM main boom locking pins. Ensure personnel an clear before operating the folding or the extension boom. WARNING 126 Ensure that the extension boom is locked prior to towing. WARNING On completion of lowering the load the two MI X 20 screws must be removed and the plugs must be refitted to the winch brake end plate. If this is not done, an accident can occur since the winch brake is completely out of action. WARNING Ensure personnel are clear before operating earth anchors. WARNING 134 Removal of the valves mounted on the top of the earth anchor leg cylinder may result in sudden movement of the earth anchor leg and explosive release of hydraulic fluid. WARNING Removal of the valve adjacent to the hydraulic cylinder port marked 'R' (stamped on the top face of the cylinder end cap) may result in the earth anchor leg dropping if it is unrestrained. WARNING If the MRV is supported on the earth anchor legs the hydraulic valve immediately adjacent to the hydraulic cylinder port marked 'E' (stamped on the top face of the cylinder end cap) must not be removed. WARNING 135 Attempting to lower the MRV by large movements on each side may result in overturning of the vehicle. WARNING The Unimog U1700L rear lift towing adaptam are suitable only for rear lift towing of an unladen Unimog U1700L vehicle. During all -tic lifting opontions, take cam in the pmmnce of werhead powr lines. WARNINO Do not allow bystanders to stand inside the risk area of the ropa when a winch it operating. WARNING Leather glows mud always be worn when handlina steel win rope mdsiingt. WARNING A vehicle mounted cram Is dangerous If operated incorrectly. Meoperator must exercise extreme caution to avoid mistakes which may result in personal injury or property damage. The crane should be operated by trained personnel. WARNING Do not operate the cnne until both stabiliser legs have been lo~nndand the stabilioer feet anon firm standing. WARNING Do not driw the MRV with damaged or incorrectly inflated tyros. WARNING Do not remove the coolant expansion tank filkr cap while the engine is hot. The cooling system is pressurised and sudden reteaoe of pnssun may cause boiling coolant to be ejected, If the engine has overheated and steam is escaping from the coolant expansion tank, allow the engine to cool befon adding mom water to the coolant expansion tank When the engine k quite cool, the filltr cap can k removed. Place a thick cloth ovsr the cap and slowly unscnw it until a sudden drop in resistance is felt. At this point, if the engine and eoolant is still hot, rapour will be heard escaping. Only when this ceases should the cap be fully removed. WARNING 193 Do not remove the coolant expansion trnk filler cap while the engine is hot. the cooling system is prassurfred and sudden release of pmssum may cause boiling coolant to be ejected. menthe engine is quite cool, the filler cap can be removed. WARNING Bawars of the rotating cooling fan behind the radiator when checking the power steering fluid level. LIST OF CONTENTS Preliminary Pages Page No. Front Page ...................................................................................i Amendment Record............................................................... ii ... Synopsis ..................................................................................... III Warnings ....................................................................................iv List of Contents........................................................................... xi ... List of Illustrations .............................................................. xxl~ List of Tables ............................................................................ xxvii Associated Publications ........................................................... xxviii Frontispjece................................ .. .......................................... xxxi Maintenance Supply Items ........................................................xxxii Title Para No. Chapter 1 General Description Chapter 1 Section 1 .Data Summary General ...................................................................1 .1 Engine ................................ .. ...............................1.2 Air