Usage:
613C, 615, 814B Tractors;
815B, 816B Compactors;
950B, 966D Loaders
Reference: Service Manuals for above models. Write a note in the Power Train Specifications Module referring to this Service Magazine article on wheel bearing adjustment.
An improvement has been made to the procedure for adjusting the final drive and wheel bearings on the above models. In addition to using the same shim procedure as formerly used, a rotational torque check is made on the wheels. This is another check for quality assembly to determine if the preload on both sets of bearings is correct.
Excessive preload shortens bearing life. Insufficient preload shortens the life of planet gears and Duo-Cone seals.
This method of checking the rotating torque required after a bearing adjustment can be used on all of the above machines. This method does not apply to earlier models, for example 613B Tractors, because they use a nut for bearing preload.
The entire bearing adjustment procedure and the new check for wheel rotating torque is printed in this article. The procedure steps are the same for all the listed models, but some of the assembly specifications are different. The specifications that are different are listed in the chart.
The torques listed in the chart are the desired torques to keep the wheel slowly turning, after deducting for Duo-Cone seal torque. They are not the initial torques just to start rotation. The WHEEL RIM torques are also based on using the 9S7354 Torque Wrench, which has a grip length of 203 mm (8.0"). See illustration. The grip length is the distance from the center of the hand to the center of the wrench square drive. Any length torque wrench can be used, but you MUST always GRIP the torque wrench 203 mm (8.0") from the wheel rim mounting bolt.
Location of the torque wrench and major parts.
The complete bearing adjustment procedure and how to check for actual bearing rolling torque is:
1. Inspect all parts to be sure they are the correct parts, and clean and free of any burrs or damage.
2. Press wheel bearing cups into the wheel. Check seating with feeler gauge.
3. Install the Duo-Cone seal in the wheel. Clean and dry the ramps and lightly oil the seal surfaces.
4. Install the Duo-Cone seal in the spindle. Clean and dry the ramps and lightly oil the seal surfaces.
5. Install the outer wheel bearing cone on the hub. Put a little oil on the cone.
6. Install the inner wheel bearing cone on the spindle. Put a little oil on the cone.
7. Put the wheel on the spindle.
8. Place the hub on the spindle.
9. Use an outside micrometer and measure the thickness of the bearing adjusting plate at the three small holes. Find the average thickness and write down this figure.
10. Install the adjusting plate on the spindle. Do not use shims and do not tighten the bolts.
11. Rotate the wheel to seat the bearing rollers on the cone.
12. While rotating wheel, tighten three of the adjusting plate bolts to 100 N·m (75 lb ft) to seat the parts.
13. Loosen the three bolts.
14. Using the 9S7354 Torque Wrench on the mounting bolt for the wheel rim, write down the rolling torque that it takes to continuously turn the wheel. This is the torque caused by Duo-Cone seals. Be sure the grip length on the torque wrench is 203 mm (8.0").
15. While rotating the wheel, tighten the three plate bolts to 25 N·m (20 lb ft).
16. Use a depth micrometer and measure through the three small holes in the plate. Find the average depth.
17. Find the difference between the two average measurements in Steps 16 and 9. The difference is the gap between the end of the spindle housing and the plate.
18. Remove the plate. Install an amount of shims equal to the same thickness as the average gap found in the preceding step, plus the additional shims listed in the chart.
19. Reinstall the plate and all its bolts.
20. Tighten all the bolts evenly to 150 ± 20 N·m (110 ± 15 lb ft).
21. Attach the 9S7354 Torque Wrench to the wheel rim mounting bolt and read the torque needed to continuously rotate the wheel. (The final drive is NOT installed.)
NOTE: If the 9S7354 Torque Wrench is not used, be sure your grip length is 203 mm (8") from the wheel bolt.
22. From the torque obtained in the preceding step, subtract the seal rotating torque obtained in Step 14. This is the actual rolling torque for the preloaded bearings, and should agree with the Wheel Rim Torque in the chart.
NOTE: If desired, a strap iron with a nut in the center can be bolted across the wheel and the torque wrench placed directly on this nut. In this case, the desired rotating torque is the Center of Wheel Torque listed in the chart. Any grip length can be used on the torque wrench to obtain the seal torque and actual bearing torque.
If the turning torque is quite high, disassemble the parts and check for interference. If the torque with new bearings is lower than that for used bearings, measure and compute again the amount of shims needed.