2005/05/30 Caterpillar

Landfill Compactor:

826C (S/N: 87X1-UP)

836 (S/N: 3RL1-UP)

Soil Compactor:

825C (S/N: 86X1-UP)

Wheel Dozer:

824C (S/N: 85X1-UP)

834B (S/N: 7BR1-UP; 92Z1-UP)

Wheel Loader:

980C (S/N: 63X1-UP)

980F Series II (S/N: 5XJ617-UP; 4RN1-UP; 8JN1-UP)

980F (S/N: 8CJ1-UP; 5XJ1-616; 3HK1-UP)

988B (S/N: 50W1-UP)

988F (S/N: 8YG1-UP)

992C (S/N: 42X1-UP; 49Z1-UP)

992D (S/N: 7MJ1-UP)

Service Magazine SEBD1470, 25 June 1984, "New Wheel Bearing Adjustment Procedure". Disregard this article. The correct information follows.

Illustration 1	g01172591
Components for the wheel bearing adjustment

Illustration 2	g01173644
(1) Bolts (2) Retainer (3) Small gauge hole (E) Depth micrometer

Adjustment Procedure Off the Machine

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Illustration 3	g01173650

1. Use an outside micrometer in order to measure thickness (X) of the retainer. Take one measurement at each of the three small gauge holes (3). Determine the average plate thickness from these measurements.

2. Put the spindle on a support (or on the floor) so that the small end is up.

3. Put oil on the wheel bearings, brake discs, and plates. Assemble the brake group, wheel bearings, wheel assembly, and the hub on the spindle.

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Illustration 4	g01172720
Bolt tightening sequence

4. Install the retainer without shims. In order to fasten the retainer to the spindle, install five bolts (three bolts for the 980) finger tight so that the bolts are equally spaced. Refer to Illustration 4 for the bolt locations.

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Illustration 5	g01173644

5. Use depth micrometer (E) in order to measure the depth through the small gauge holes (3). Find the average value of the three measurements. The average is the "ZERO" reading.

6. Tighten the bolts that fasten the retainer to the spindle to the torque that is given in Table 1 below.
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   Table 1

   Model	Bolt Torque
   992	135 ± 14 N·m (100 ± 10 lb ft)
   834836988	90 ± 14 N·m (65 ± 10 lb ft)
   824825826980	100 ± 14 N·m (75 ± 10 lb ft)

7. Rotate the wheel for several revolutions and recheck the bolt torques.

8. Loosen the bolts until the retainer is loose. Rotate the wheel assembly for one complete revolution.

9. Use depth micrometer (E) in order to measure the depth through the small gauge holes (3). Find the average value of the three measurements.

10. Compare the average measurement from Step 9 to the "ZERO" reading from Step 5. If the difference is 0.05 mm (0.002 inch) or less, proceed to Step 12. If the difference is greater than 0.05 mm (0.002 inch), repeat Step 6 through Step 9. Then, go to Step 11.

11. Find the difference between the first measurement and the second measurement that was found in Step 9. If the difference is greater than 0.05 mm (0.002 inch), disassemble the parts in order to determine the problem. If the difference is 0.05 mm (0.002 inch) or less, proceed to Step 12.

12. Tighten the bolts to the torque that is given in Table 2 below.
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    Table 2

    Model	Bolt Torque
    825826834836988992	40 ± 7 N·m (30 ± 5 lb ft)
    824980	25 ± 7 N·m (18 ± 5 lb ft)

13. Rotate the wheel for several revolutions and torque the bolts again. Continue the sequence of rotating the wheel and torquing the bolts until the bolt torque does not change.

14. Use depth micrometer (E) in order to measure the depth through the small gauge holes (3). Find the average value of the three measurements.

15. Subtract the thickness (X) of the retainer from the value that was found in Step 14. This difference is the clearance between the end of the spindle and the retainer.

16. Add the value from Table 3 below to the value that was found in Step 15. The result is the correct thickness of shims that is needed.
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    Table 3

    Model	Thickness (1)
    992	-0.20 mm (-0.008 inch)
    834836988	+0.10 mm (+0.004 inch)
    825826	+0.18 mm (+0.007 inch)
    824980	+0.076 mm (+0.003 inch)

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    ( 1 )

    Add this value to the value that was found in Step 15.

17. Remove the bolts that fasten the retainer to the spindle and remove the retainer.

18. Install the appropriate thickness of shims that was found in Step 16. Then, fasten the retainer to the spindle with all of the bolts. Tighten the bolts evenly to the torque that is given in Table 4 below. Turn an additional 120 ± 10°.
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    Table 4

    Model	Bolt Torque
    824834836980988992	115 ± 20 N·m (85 ± 15 lb ft)
    825826	85 ± 15 N·m (65 ± 10 lb ft)

Adjustment Procedure on the Machine

Note: This procedure can be performed with the tire and rim in place.

1. Use an outside micrometer in order to measure thickness (X) of the retainer. Take one measurement at each of the three small gauge holes (3). Determine the average plate thickness from these measurements.

2. Put oil on the wheel bearings, brake discs, and plates. Put the wheel assembly and bearings in position on the spindle.

3. Install the hub and ring gear.

4. Install the retainer without shims. In order to fasten the retainer to the spindle, install the correct number of bolts from Table 5 below. Equally space the bolts. Install the first bolt of the equally spaced bolts at the top of the spindle. Refer to Illustration 4.
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   Table 5

   Model	Number of Bolts
   992	10
   825826834988	5
   980C824C	3

5. Tighten the bolts in the sequence that is shown in Illustration 4. Tighten the bolts to the torque that is given in Table 6 below.
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   Table 6

   Model	Bolt Torque
   824825826980992	100 ± 14 N·m (75 ± 10 lb ft)
   834836988	90 ± 14 N·m (65 ± 10 lb ft)

6. Rotate the wheel for several revolutions and recheck the torque of each bolt.

7. Loosen the bolts so that the wheel assembly can move a small amount on the wheel bearings.

8. Tighten the bolts in the sequence that is shown in Illustration 4. Tighten the bolts to the torque that is given in Table 7 below.
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   Table 7

   Model	Bolt Torque
   824834836980988992	40 ± 7 N·m (30 ± 5 lb ft)
   825826	70 ± 8 N·m (50 ± 5 lb ft)

9. Rotate the wheel for several revolutions and torque the bolts again. Continue the sequence of rotating the wheel and torquing the bolts until the bolt torque does not change.

10. Use depth micrometer (E) in order to measure the depth through the small gauge holes (3). Find the average value of the three measurements.

11. Subtract the thickness that was found in Step 1 from the value that was found in Step 10. The difference is the clearance between the end of the spindle and the retainer.

12. Add the correct value from Table 8 below to the value that was found in Step 11. The result is the correct thickness of shims that is needed.
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    Table 8

    Model	Thickness (2)
    992	0.00 mm (0.000 inch)
    834836988	0.25 mm (0.010 inch)
    825826	0.36 mm (0.014 inch)
    824980	0.15 mm (0.006 inch)

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    ( 2 )

    Add this value to the value that was found in Step 11.

13. Remove the bolts and remove the retainer.

14. Install the appropriate thickness of shims that was found in Step 12. Then, fasten the retainer to the spindle with all of the bolts. Tighten the bolts evenly to the torque that is given in Table 9 below. Turn an additional 120° ± 10°.
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    Table 9

    Model	Bolt Torque
    824834836980988992	115 ± 20 N·m (85 ± 15 lb ft)
    825826	85 ± 15 N·m (65 ± 10 lb ft)