824H Wheel Dozer, 825H Soil Compactor and 826H Landfill Compactor Machine Systems Caterpillar

Connection Procedure

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Illustration 1	g01082577

1. Coat the bores of the hitch with Tooling (M). Use Tooling (K) (not shown) to install the sleeve bearings (26) for the upper hitch.
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   Illustration 2	g01082370

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   Illustration 3	g00523210

2. Use Tooling (L) to install seals (29) and (35) into upper cap (28) and lower cap (36). Install the seal in the lower cap with the sealing lip toward the outside of the cap. Install the seal in the upper cap with the sealing lip inside the cap. Install lower cap (36) and install three equally spaced bolts (27) into the upper hitch. Torque bolts (27) to a torque of 100 ± 20 N·m (74 ± 15 lb ft). Lower the temperature of bearing cup (33) . Install bearing cup (33) until bearing cup (33) contact with lower cap (36).

3. Lubricate bearing cones (32) and (34) with clean oil and install bearing cones (32) and (34). Lower the temperature of bearing cup (31) . Install bearing cup (31) until bearing cup (31) makes light contact with bearing cone (32).

4. Remove bolts (27). Install the original shims (30) and install upper cap (28). Install bolts (27). Tighten bolts (27) to a torque of 100 ± 20 N·m (74 ± 15 lb ft).
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   Illustration 4	g01082594

5. Install Tooling (N) and a torque wrench to check the rolling torque of the upper hitch bearings. The correct rolling torque should be between 2.3 N·m (20 lb in) and 13.6 N·m (120 lb in). Remove Tooling (N), bolts (27), upper cap (28), and lower cap (36) after the correct rolling torque has been reached.

   Note: Adding shims will decrease the amount of rolling torque. Removing shims will increase the amount of rolling torque.

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   Illustration 5	g01082407

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   Illustration 6	g00523224
   Typical example

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   Illustration 7	g01082710

6. Use Tooling (L) to install seals (41) and (48). Install the seal in the lower cap with the sealing lip toward the outside of the cap. Install the seal in the upper cap with the sealing lip inside the cap. Install cap (47) for the lower hitch. Install three equally spaced bolts (37). Tighten bolts (37) to a torque of 100 ± 20 N·m (74 ± 15 lb ft). Lower the temperature of bearing cup (44). Install bearing cup (44) until the bearing cup contact with cap (47). Lubricate bearing cones (43) and (45) with clean oil. Install bearing cones (43) and (45) until the bearing cones make slight contact with bearing cup (44).

7. Remove bolts (37) and install bearing cup (42). Install original shims (40) and cap (39). Tighten bolts (37) to a torque of 100 ± 20 N·m (74 ± 15 lb ft).

8. Install Tooling (P) and a torque wrench to check the rolling torque of the upper hitch bearings. The correct rolling torque should be between 11 N·m (100 lb in) and 40 N·m (350 lb in). Remove Tooling (N), bolts (37), upper cap (39), and lower cap (47) after the correct rolling torque has been reached.

   Note: Adding shims will decrease the amount of rolling torque. Removing shims will increase the amount of rolling torque.

9. Install upper cap (39) and lower cap (47). Install bolts (37). Tighten bolts (37) to a torque of 100 ± 20 N·m (74 ± 15 lb ft). Install spacer (38).
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   Illustration 8	g01081990

10. Attach Tooling (B) and a suitable lifting device to the top of the cab, as shown.
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    Illustration 9	g01082051

11. Attach a suitable lift truck to the rear frame, as shown. Use a chain (18) to connect the rear frame to the lift truck, as shown.
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    Illustration 10	g01082066

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    Illustration 11	g01082081

12. Use the suitable lifting device to apply slight upward pressure to the cab. Use the suitable lifting device that is connected to the cab and the lift truck to connect rear frame (25) to the front frame. Support the front of rear frame (25) on Tooling (D), as shown. Support the rear of the rear frame (25) by using Tooling (E) and (F).
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    Illustration 12	g06303368

13. Use Tooling (A) to aid in the alignment of the pin bores, as shown. The two hydraulic jacks can be used independently to align the pin bores. Refer to Tool Operating Manual, NEHS1303, "Lift Group (Stand - 25 Ton)" for more information on Tooling (A).
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    Illustration 13	g01081993

14. Remove the cab mount. Raise the cab. Install a 76 mm (3 inch) block of wood (5) on both sides of the cab. Rest the cab on wood blocks (5).
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    Illustration 14	g01082005

15. Coat the pin bores by using Tooling (M). Lower the temperature of pin assembly (12) for the upper hitch. Install pin assembly (12). Install the washer and bolt (11). Tighten bolt (11) to a torque of 100 ± 20 N·m (74 ± 15 lb ft). Connect harness assembly (9) and clamp (10).
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    Illustration 15	g01082000

16. Pull mat (8) toward the front of the cab. Install strip (7) and install bolts (6).
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    Illustration 16	g01082057

17. Lower the temperature of pin assembly (19) for the lower hitch. Install pin assembly (19). Install spacer (20). Install plate (23) by using two bolts and washers (24). Tighten bolts (24) to a torque of 800 ± 100 N·m (590 ± 74 lb ft). Measure the gap between plate (23) and the frame. Record this measurement.

18. Subtract 0.25 mm (.0098 inch) from the measurement that was recorded in the previous step. This is the shim thickness that should be used between plate (23) and the frame. Remove bolts (24) and plate (23). Install the required amount of shims (22), plate (23), and the washers and bolts (24). Tighten bolts (24) to a torque of 900 ± 100 N·m (664 ± 74 lb ft). Install the washers and bolts (21). Tighten bolts (21) to a torque of 100 ± 20 N·m (74 ± 15 lb ft).
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    Illustration 17	g01082040

19. Remove blocks (15) between the rear axle and the frame.
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    Illustration 18	g01082049

20. Connect steering shaft (17). Install bolt (16).
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    Illustration 19	g01082022

21. Connect hose assemblies (14) that connect the front frame to the rear frame.
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    Illustration 20	g01082013

22. Install the pin for the rod end of the steering cylinders. Install bolts (13) and the washers to the rod end of both steering cylinders.
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    Illustration 21	g01081985

23. Remove the wood blocks that were installed in step 14. Install the front mounting bolts (4) for the cab. Tighten bolts (4) to a torque of 425 ± 50 N·m (315 ± 37 lb ft).
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    Illustration 22	g01081984

24. Install the rear wiper arm (3). Install bolts (2). Connect hose (1).

End By:

1. Install the center drive shaft. Refer to Power Train, "Drive Shaft (Center) - Remove and Install".