Spartan Chassis,Inc
Total Page:16
File Type:pdf, Size:1020Kb
SPARTAN CHASSIS,INC. TSB04-160-001 November, 2004 Page 1 of 4 T E C H N I C A L S E R V I C E B U L L E T I N SUBJECT: IFS84 Turning Radius APPLIES TO: Spartan K2 Chassis Models Equipped with an IFS84 Front Suspension System and a VDM (Vehicle Date of Manufacture) on or before 8-27-04. CONDITION: Cannot Achieve the Specified Turning Radius There is at least a 1/2 turn difference in range between turning the steering wheel from center to full lock left and turning the steering wheel from center to full lock right. CORRECTION: Adjust steering system; check and adjust toe in. PART / SERVICE INFORMATION: Labor Time: 2.0 Hrs. PLEASE READ THE ENTIRE BULLETIN BEFORE PROCEEDING WITH ANY WORK. STEP-BY-STEP INSTRUCTIONS: 1. Observe all industry safety standards and secure vehicle for alignment of front wheels. Refer to the most recent version of the Dana Spicer Specialty Axle Division PARTS AND SERVICE MANUAL FOR IFS84 FRONT SUSPENSION Commercial Vehicle Systems - Technical Publications; currently Manual No. 1968 Issue A, Jun 2003. 2. Ensure ride height (front 8.00”; 8.25” rear) and tire pressures are set according to manufacturer specifications. 3. Ensure wheels are directed straight forward. Refer to FIG. No 1. Check that the markings on the steering gear and input shaft are aligned. Technical Service Bulletins are intended for use by Professional Technicians only. They are written to guide Professional Technicians in performing service to vehicles of product specific nature in conjunction with industry standards. Professional Technicians are appropriately trained on industry standards and have the tools and equipment to perform procedures safely and properly. SPARTAN CHASSIS,INC. TSB04-160-001 November, 2004 Page 2 of 4 T E C H N I C A L S E R V I C E B U L L E T I N INPUT SHAFT ALIGNMENT TOP VIEW OF STEERING GEAR FIG. NO. 1 4. Disconnect drag link. 5. Measure distance from relay levers to a convenient point on the chassis / subframe to determine that the levers are parallel and equidistant to axle center-line within 1/16” per side. Any adjustment required can be effected by slackening clamp bolts in ball sockets and rotating the central tie (track) rod tube. After adjustment, tighten clamp bolts (36 - S10) to 70 +/- 5 lbs. ft. (88/102Nm.) torque. NOTE: The clamp tabs must be positioned at the top of the tube. 6. With the steering wheel secured at the straight ahead position, adjust the drag link length so that it drops into the taper hole and torque castle nut 150 +/- 20 lbs. ft. and clamp bolts 60 lbs.ft. NOTE: DO NOT reuse cotter pin. Install a new cotter pin. Technical Service Bulletins are intended for use by Professional Technicians only. They are written to guide Professional Technicians in performing service to vehicles of product specific nature in conjunction with industry standards. Professional Technicians are appropriately trained on industry standards and have the tools and equipment to perform procedures safely and properly. SPARTAN CHASSIS,INC. TSB04-160-001 November, 2004 Page 3 of 4 T E C H N I C A L S E R V I C E B U L L E T I N 7. Check the alignment (toe-in) of the front wheels with the specification stated in figure 2. To overcome the difficulties of measuring over the hub flanges due to bodywork/chassis obstruction, it is usual practice to employ optical equipment which fastens to the wheels. In this case follow the equipment manufacturer’s recommended practices for use. Alternatively, measuring aids can be produced which fasten to the wheel rim and that extend beyond the tire and down towards ground level. This is to allow the use of a tape measure underneath the vehicle. However, this method is not as accurate and it must be noted that the 1/32” toe-in dimension must be factored to take into account that the points at which the measurements are taken are further away from wheel center-line. Any adjustment required can be effected by slackening clamp bolts in ball sockets and rotating the outer tie (track) rod tube before tightening clamp bolts (36 - S10) to 70 +/- 5 lbs. ft. (88/102Nm.) torque. NOTE: The clamp tabs must be positioned at the top of the tube. 8. To allow for inaccuracies in wheels, the same check should be made with vehicle moved an equivalent to one half (1/2) of a wheel revolution. The 1/32” toe-in dimension equates to an inclusive angle of 0.13° or 0.065° per side. Technical Service Bulletins are intended for use by Professional Technicians only. They are written to guide Professional Technicians in performing service to vehicles of product specific nature in conjunction with industry standards. Professional Technicians are appropriately trained on industry standards and have the tools and equipment to perform procedures safely and properly. SPARTAN CHASSIS,INC. TSB04-160-001 November, 2004 Page 4 of 4 T E C H N I C A L S E R V I C E B U L L E T I N 9. To check steering wheel alignment, perform the following steps: 9a. Drive vehicle in reverse a minimum of 4 tire revolutions and stop. 9b. Drive vehicle straight forward a minimum of 4 tire revolutions without touching the steering wheel and roll to a stop if possible. DO NOT JAM ON THE BRAKES. If brakes are depressed with too much force (other than lightly), repeat step 9a. 9c. If steering wheel is not aligned, proceed to step 9d. Otherwise skip to step #10. 9d. Carefully remove center pad of steering wheel by loosening retaining cap screw. 9e. Unplug wiring connector (wheel to clockspring). 9f. Remove steering wheel nut and remove steering wheel from column using a steering wheel puller. 9g. Remove the column cover and follow the instructions on the clock spring for recentering the clock spring. Note: The clock spring mechanism must be recentered any time the steering wheel is removed, the intermediate shaft disconnected, or steering geometry has changed. 9h. Reinstall steering wheel and center pad. Torque wheel nut to 40 lbs.ft. CLOCK SPRING MECHANISM COLUMN COVER WIRING CONNECTION STEERING WHEEL 10. Test drive vehicle. The steering wheel turning range from center to full lock right should be within 1/2 a turn of the range from center to full lock left. Technical Service Bulletins are intended for use by Professional Technicians only. They are written to guide Professional Technicians in performing service to vehicles of product specific nature in conjunction with industry standards. Professional Technicians are appropriately trained on industry standards and have the tools and equipment to perform procedures safely and properly. .