Installation of 8A (1HH) Bulldozer{6052} Caterpillar

Introduction

This Special Instruction gives the procedure for installation of the lift cylinders and the 8A Bulldozer with or without dual tilt cylinders.

NOTE: Each section contains the related parts list.

After the assembly is complete, prepare the machine for service as shown in the machine's Operation & Maintenance Manual.

Do not perform any procedure, outlined in this publication, or order any parts until you read and understand the information contained within.

Reference: Service Manual, Parts Manual and Operation & Maintenance Manual.

Show/hide table

Do not attempt to assemble this machine until you have read and understand the assembly instructions. Improper procedures could result in injury or death.

NOTE: Do not coat any fasteners with oil or grease prior to tightening, "unless instructed to do so."

Weights

Shimming Procedure (Typical)

Typical Example

1. Remove all the shims from assembly (1).

2. Install assembly (1) and cap (2) on trunnion (3) without the shims. Tighten the bolts until snug using five percent of the specified joint torque or 50 N·m (37 lb ft), which ever is larger. Maintain equal distance on both (A) and (B) of cap (2).

3. Insert an equal amount of shims as needed into spaces (A) and (B), between the cap and the assembly.

NOTE: The number of shims at (A) must be equal to, or within one of the number of shims at (B). For example, if (A) has eight shims, (B) must have seven, eight or nine shims.

4. Add one additional shim to space (A) and one additional shim to space (B).

5. Tighten the cap to the proper torque.

6. This should allow the assembly to move on the trunnion freely and within the specified tolerance (0.25 mm minimum).

NOTE: It may be necessary to remove one or more shims after a short time of "Wear In" due to normal surface variations or paint thicknesses.

Installation of Lift Cylinders

Necessary Parts

NOTE: Clean all surfaces where parts are to be installed, including removal of paint from mating surfaces.

Installation Procedure

1. Lubricate seal (1) with multipurpose type grease. Install seal (1) in radiator guard housing with the lips to the outside.

2. Pack lift cylinder mounting bearing bores in radiator guard housing with multipurpose type grease.

3. Install yoke (2) in radiator guard housing. Lock yoke (2) in place with pin (3).

NOTE: Remove cover (A) and bolts (B) to install pin (3). Install cover (A) and bolts (B) after pin (3) is installed.

4. Install fitting (5) in radiator guard housing.

5. Pack cap assemblies (4) with multipurpose type grease.

6. Install cap assemblies (4) on trunnions of lift cylinder (7).

7. Mount lift cylinder (7) and cap assemblies (4) on yoke (2) with four bolts (6). Tighten bolts (6) to a torque of 430 ± 60 N·m (315 ± 44 lb ft).

8. Install plate assembly (8) to plate (C) with two washers (9) and two bolts (10). Assemble mounting (11), two spacers (12), and bolt (13) to plate assembly (8) and radiator guard housing.

9. Repeat Steps 1 through 8 for the other side of the machine.

NOTE: Remove shipping covers from manifold on radiator guard housing and lift cylinders (7).

10. Connect hose assemblies (14) and (15) to cylinder group (7) using two seals (16), four flanges, and eight washers and bolts.

NOTE: The items not numbered are part of cylinder group (7).

11. Connect hose assemblies (14) and (15) to manifold on radiator guard housing using two seals (17), four flanges, and eight washers and bolts.

NOTE: The items not numbered are part of the lines group that comes with the tractor.

12. Install bracket assembly (18) to cylinder group (7) with two washers and bolts from the tube assembly.

13. Install guard (19) to bracket assembly (18) with washer (20) and bolt (21).

14. Repeat Steps 10 through 13 for the other cylinder group.

Installation of Trunnions

Necessary Parts

Installation Procedure

Typical Example

Starting on one side:

1. Remove shipping cover (1) from the track roller frame.

Typical Example

2. Remove plug (3) and move plate (2) in towards the center of the tractor as far as possible. Install plug (3) back in the plate.

NOTE: Step 2 eliminates the hydraulic pressure that forms between seal plate (2) and pivot shaft retainer plate (A). This step also allows adequate clearance between trunnion assembly (4) and plate (2).

Typical Example

3. Install the guide pins [same thread size as bolts being installed, approximately 203 mm (8 in) in length] in the track roller frame.

Typical Example

4. Start trunnion assembly (4) on the guide pins.

Typical Example

5. Install trunnion assembly (4) with 16 washers (5) and bolts (6).

6. Tighten bolts (6) to a torque of 240 ± 40 N·m (175 ± 30 lb ft).

Repeat Steps 1 through 6 for other side of the machine.

Bulldozer Assembly (Without Dual Tilt)

Necessary Parts

Assembly Procedure

1. Assemble frame assembly-RH (1) to frame assembly-LH (2) with 2 keys (4), 64 washers (3), 32 bolts (5), and 32 nuts (6). Tighten bolts (5) to a torque of 430 ± 60 N·m (315 ± 44 lb ft).

2. Install pin (7) in frame assembly-RH (1) with retainer (8) and two bolts (9). Tighten bolts (9) to a torque of 430 ± 60 N·m (315 ± 44 lb ft).

3. Measure the height from the ground to the trunnion assembly on the roller frames.

4. Raise and block the rear of the C-frame assembly (A) to the height measured in Step 3.

5. Move machine in position between C-frame assembly (A) and stop the engine.

6. Install C-frame assembly (A) to trunnion assembly with cap (10), shims (11), two bolts (12), two washers (13), and two nuts (14). Tighten bolts (12) to a torque of 2100 ± 250 N·m (1540 ± 185 lb ft). See the topic entitled Shimming Procedure in this Special Instruction for shimming instructions.

Repeat Step 6 for the other side of the machine.

NOTE: Remove shipping plate assembly and plate from lift cylinder and radiator guard housing, before connecting lift cylinder to C-frame assembly (A).

7. Connect lift cylinder to C-frame assembly (A) with cap, shims, four bolts, and nuts. Tighten bolts to a torque of 430 ± 60 N·m (315 ± 44 lb ft). See the topic entitled Shimming Procedure in this Special Instruction for shimming instructions.

NOTE: The items not numbered are part of the lift cylinder group.

Repeat Step 7 for the other side of the machine.

8. Raise and block the bulldozer blade in an upright position.

9. Install arm assembly-RH (21) to bulldozer blade with pin (18), retainer (19) and two bolts (20). Tighten bolts (20) to a torque of 240 ± 40 N·m (175 ± 30 lb ft).

10. Install arm assembly-LH (22) to bulldozer blade with pin (18), retainer (19) and two bolts (20). Tighten bolts (20) to a torque of 240 ± 40 N·m (175 ± 30 lb ft).

11. Align C-frame assembly (A) with bulldozer blade and connect pin (7) to bulldozer blade with pin (15), retainer (16), and bolt (17). Tighten bolt (17) to a torque of 240 ± 40 N·m (175 ± 30 lb ft).

12. Assemble ballstud (23) to arm assembly-RH (21) with cap (26), shims (27), and four bolts (28). Tighten bolts (28) to a torque of 240 ± 40 N·m (175 ± 30 lb ft). See the topic entitled Shimming Procedure in this Special Instruction for shimming instructions.

13. Install arm assembly-RH (21) with ballstud (23) to C-frame assembly (A) with pin (24) and pin (25).

14. Install brace group (29) to bulldozer blade with cap, shims, and four bolts and nuts. Tighten bolts to a torque of 1050 ± 150 N·m (780 ± 110 lb ft). See the topic entitled Shimming Procedure in this Special Instruction for shimming instructions.

NOTE: The items not numbered are part of the brace group.

(B) 1373 mm (54.05 in)

15. Adjust brace group (29) to dimension (B).

NOTE: Apply a heavy coating of multipurpose type grease to the threaded surfaces on brace group (29).

16. Assemble other end of brace group (29) to arm assembly-RH (21) with pin (30), retainer (31), and two bolts (32). Tighten bolts (32) to a torque of 700 ± 90 N·m (520 ± 65 lb ft).

Repeat Steps 12 through 16 for the left hand side of the machine.

17. Check oil in hydraulic tank and fill if necessary. Cycle cylinders full stroke in both directions to purge air from lines and cylinders. Refill hydraulic tank to full mark.

(C) 25 to 45 mm (1 to 1.8 in)

After the assembly is complete, get the machine ready for use as shown in the machine's Operation & Maintenance Manual.

Bulldozer Assembly (With Dual Tilt)

Necessary Parts

Assembly Procedure

1. Assemble frame assembly-RH (1) to frame assembly-LH (2) with 2 keys (4), 64 washers (3), 32 bolts (5), and 32 nuts (6). Tighten bolts (5) to a torque of 430 ± 60 N·m (315 ± 44 lb ft).

2. Install pin (7) in frame assembly-RH (1) with retainer (8) and two bolts (9). Tighten bolts (9) to a torque of 430 ± 60 N·m (315 ± 44 lb ft).

3. Measure the height from the ground to the trunnion assembly on the roller frames.

4. Raise and block the rear of the C-frame assembly (A) to the height measured in Step 3.

5. Move machine in position between C-frame assembly (A) and stop the engine.

6. Install C-frame assembly (A) to trunnion assembly with cap (10), shims (11), two bolts (12), two washers (13), and two nuts (14). Tighten bolts (12) to a torque of 2100 ± 250 N·m (1540 ± 185 lb ft). See the topic entitled Shimming Procedure in this Special Instruction for shimming instructions.

Repeat Step 6 for the other side of the machine.

NOTE: Remove shipping plate assembly and plate from lift cylinder and radiator guard housing, before connecting lift cylinder to C-frame assembly (A).

7. Connect lift cylinder to C-frame assembly (A) with cap, shims, four bolts, and nuts. Tighten bolts to a torque of 430 ± 60 N·m (315 ± 44 lb ft). See the topic entitled Shimming Procedure in this Special Instruction for shimming instructions.

NOTE: The items not numbered are part of the lift cylinder group.

Repeat Step 7 for the other side of the machine.

8. Raise and block the bulldozer blade in an upright position.

(B) 1190.0 ± 1.5 mm (46.85 ± .06 in)

9. Install tube assemblies (33) and (34) to blocks on bulldozer blade with four blocks (35) and four bolts (36). Tighten bolts (36) to a torque of 50 ± 10 N·m (37 ± 7 lb ft).

NOTE: Before tightening bolts (36), align tube assemblies (33) and (34) to dimension (B) from center line of bulldozer blade.

10. Install arm assembly-RH (21) to bulldozer blade with pin (18), retainer (19) and two bolts (20). Tighten bolts (20) to a torque of 240 ± 40 N·m (175 ± 30 lb ft).

11. Install arm assembly-LH (22) to bulldozer blade with pin (18), retainer (19) and two bolts (20). Tighten bolts (20) to a torque of 240 ± 40 N·m (175 ± 30 lb ft).

12. Align C-frame assembly (A) with bulldozer blade and connect pin (7) to bulldozer blade with pin (15), retainer (16), and bolt (17). Tighten bolt (17) to a torque of 240 ± 40 N·m (175 ± 30 lb ft).

13. Assemble ballstud (23) to arm assembly-RH (21) with cap (26), shims (27), and four bolts (28). Tighten bolts (28) to a torque of 240 ± 40 N·m (175 ± 30 lb ft). See the topic entitled Shimming Procedure in this Special Instruction for shimming instructions.

14. Install arm assembly-RH (21) with ballstud (23) to C-frame assembly (A) with pin (24) and pin (25).

NOTE: Extend cylinder group (29) to approximately 1373 mm (54 in), from center of head end eye to center of rod end eye.

15. Install cylinder group (29) to bulldozer blade with cap, shims, four bolts, and nuts. Tighten bolts to a torque of 1050 ± 150 N·m (780 ± 110 lb ft). See the topic entitled Shimming Procedure in this Special Instruction for shimming instructions.

NOTE: The items not numbered are part of the cylinder group.

16. Assemble other end of cylinder group (29) to arm assembly-RH (21) with pin (30), retainer (31), and two bolts (32). Tighten bolts (32) to a torque of 700 ± 90 N·m (520 ± 65 lb ft).

Repeat Steps 13 through 16 for the left hand side of the machine.

(D) Upper. (E) Lower.

17. Connect hose assemblies (37) to tube assemblies on the bulldozer blade with two seals (38), four flanges (39), eight washers (40), and eight bolts (41). Tighten bolts (41) to a torque of 50 ± 37 N·m (40 ± 7 lb ft).

(D) Upper. (E) Lower.

18. Connect the other end of hose assemblies (37) to the manifold on the radiator housing with two seals (38), four flanges (39), eight washers (40), and eight bolts (41). Tighten bolts (41) to a torque of 50 ± 10 N·m (37 ± 7 lb ft).

19. Connect hose assembly (42) to tube assembly (33) on bulldozer blade with seal (38), two flanges (39), four washers (40), and four bolts (41). Tighten bolts (41) to a torque of 50 ± 10 N·m (37 ± 7 lb ft).

20. Connect hose assembly (43) to tube assembly (34) on bulldozer blade with seal (38), two flanges (39), four washers (40), and four bolts (41). Tighten bolts (41) to a torque of 50 ± 10 N·m (37 ± 7 lb ft).

21. Connect hose assembly (42) to rod end of tilt cylinder with seal (38), two flanges (39), four washers (40), and four bolts (41). Tighten bolts (41) to a torque of 50 ± 10 N·m (37 ± 7 lb ft).

22. Connect hose assembly (43) to head end of tilt cylinder with seal (44), two flanges (45), four washers (46), and four bolts (47). Tighten bolts (47) to a torque of 28 ± 7 N·m (21 ± 5 lb ft).

23. Install bracket (48) to tilt cylinder with washer (49) and bolt (50). Tighten bolt (50) to a torque of 430 ± 60 N·m (320 ± 45 lb ft).

24. Install grommet (51) to hose assembly (43). Assemble clip (52) and (53) to grommet (51) and bracket (48) with bolt (54), two washers (55), and nut (56). Tighten bolt (54) to a torque of 120 ± 20 N·m (90 ± 15 lb ft).

Repeat Steps 19 through 23 for the other side of the machine.

25. Install guard assembly (57) to tilt cylinder-RH with two washers (49), two bolts (50), two washers (55), and two bolts (58). Tighten bolts (50) to a torque of 430 ± 60 N·m (320 ± 45 lb ft). Tighten bolts (58) to a torque of 120 ± 20 N·m (90 ± 15 lb ft).

26. Install guard assembly (59) to tilt cylinder-LH with two washers (49), two bolts (50), two washers (55), and two bolts (58). Tighten bolts (50) to a torque of 430 ± 60 N·m (320 ± 45 lb ft). Tighten bolts (58) to a torque of 120 ± 20 N·m (90 ± 15 lb ft).

27. Install guard assembly (60) to blocks on bulldozer blade with four washers (55) and four bolts (61). Tighten bolts (61) to a torque of 120 ± 20 N·m (90 ± 15 lb ft).

28. Check oil in hydraulic tank and fill if necessary. Cycle cylinders full stroke in both directions to purge air from lines and cylinders. Refill hydraulic tank to full mark.

(C) 25 to 45 mm (1 to 1.8 in)

After the assembly is complete, get the machine ready for use as shown in the machine's Operation & Maintenance Manual.