Installation of the S, U, and SU Bulldozer on the D7E Track-Type Tractor{6050, 6051, 6053, 6078} Caterpillar

Introduction

This Special Instruction provides the procedure for installation of the S, U, and SU Bulldozer on the D7E Track-Type Tractor.

When you have completed this procedure, prepare the machine for service. Refer to the Operation and Maintenance Manual.

Note: Do not perform any procedure in this Special Instruction until the information has been read and understood.

ReferenceService Manual, Parts Manual, Operation and Maintenance Manual.

Warnings

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

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Personal injury or death can result from sudden machine movement. Sudden movement of the machine can cause injury to persons on or near the machine. To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.

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When a hoist is used to lift any part or assembly, stand clear of the area under the part being raised. Always make sure that the hoist has adequate lifting capacity and the wire cable is not damaged. Failure to follow this instruction could lead to injury or death. Approximate weights of the components are shown in the table which follows.

Note: No oil or lubricant is recommended on new fasteners. When fasteners are reused, the fasteners should be cleaned before assembly. Also, lightly oil reused fasteners before reassembly. Instructions are given when lubrication is required.

Weights

Shimming Procedure

Push Arm and Stabilizer Link

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Illustration 1	g00292740

1. Remove all of the shims from push arm (1) .

2. Remove excess rust and paint from the contact surfaces of these components: the push arm, the cap and the shims.

3. Install push arm (1) and cap (2) on trunnion (3) without shims. Use the largest torque from the following list in order to tighten the bolts.
   • 5 percent of the specified torque

   • 50 N·m (37 lb ft)

   Maintain equal distance on both space (A) and space (B) of cap (2). Insert the maximum number of shims into spaces (A) and (B) in order to determine the required number of shims.

4. Remove the bolts that are on cap (2). Insert shims into spaces (A) and (B). Add one additional shim to space (A). Add one additional shim to space (B). When possible, use an equal number of shims for spaces (A) and (B) .

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

5. Tighten the bolts on bearing cap (2) to a torque of 1800 ± 200 N·m (1330 ± 150 lb ft).

6. The push arm should move freely on the trunnion. The specified minimum tolerance is 0.25 mm (0.010 inch).

   Note: You may be need to remove one or more shims after a short period of machine operation. Wear can be caused by normal vibrations of the surface or variations in the thickness of the paint.

Lift Cylinder

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Illustration 2	g03512402
(78) Cap (79) Bolt (80) Nut (81) Shims

1. Remove all shims (81) from lift cylinder cap (78) .

2. Put cap (78) in place by hand with an equal number of shims (81) on each side of the joint.

3. Rock cap (78) back and forth to determine the number of shims (81) required to keep the cap (78) from moving fore and aft on the trunnion.

4. Add one more shim (81) per side and torque bolts (79) to the proper torque.

   Note: The number of shims on one side of the cap must be within one of the number of shims on the other side. For example, if one side has eight shims, the other side must have seven, eight, or nine shims.

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Illustration 3	g02736792

5. Use a pry bar to check that the cylinder rod rotates freely on the trunnion as shown in Illustration 3. The specified minimum clearance is 0.25 mm (0.010 inch).

   Note: The removal of one or more shims may be necessary after a short time. Wear can be caused by normal vibrations of the surface or variations in the thickness of the paint.

Necessary Parts

Installation Procedure

Installation of Trunnions

Necessary Parts

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Illustration 4	g02086316

Note: Clean all surfaces of the parts that will be installed. Remove all paint from the mating surfaces.

1. Install trunnion (14) with 14 bolts (12) and 14 washers (13).

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

3. Perform step 1 and step 2 for the other side of the machine.

Assembly of the Bulldozer

Necessary Parts

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Illustration 5	g02087085

4. Support left push arm (25) or (25A) and right push arm (26) or (26A) with wood blocks.

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Illustration 6	g02087596

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Illustration 7	g02241933

Note: Cage (18) must be installed to left push arm (25) with the bearing bore on the left side.

5. Use cage (18), six washers (35), six bolts (32), six nuts (36), and six washers (37) to assemble left push arm (25) and right push arm (26). Tighten bolts (32) to a torque of 520 ± 70 N·m (385 ± 50 lb ft).

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Illustration 8	g02087654

6. Use cap (20), shims (15), four bolts (33), and four nuts (23) to install the push arm to the bulldozer blade. For instructions on shimming, refer to ""Shimming Procedure" ". Make sure that the chamfer on the nuts aligns with the radius on the push arm. Tighten bolts (33) to a torque of 900 ± 100 N·m (665 ± 75 lb ft).

7. Repeat step 6 for the other side of the machine.

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Illustration 9	g02241974

8. Use two pins (34) and two cotter pins (30) to install link (17) to the bulldozer blade and to the push arm. Link (17) must be assembled correctly. The link is symmetric. Make sure that there is enough clearance between the link and the blade mounting bracket by installing the link as illustrated. See illustration 9

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Illustration 10	g02087657

9. Use pins (28) and (40) in order to install brace (24). Install pin (16) and cotter pin (29) in order to retain the lower pin. Install the lower pin in the rear hole. Install retainer (39) and bolts (41) in order to retain the upper pin.

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Illustration 11	g02087664

10. Use pins (28) and (40) in order to install hydraulic cylinder (27). Install pin (16) and cotter pin (29) in order to retain the lower pin. Install the lower pin in the rear hole. Install retainer (39) and two bolts (41) in order to retain the upper pin.

Assembly of the Hydraulic Lines

Necessary Parts for the Standard Machine

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Illustration 12	g02155758

11. Assemble two elbow assemblies (46) to the blade with two locknuts (48) .

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Illustration 13	g02087673

12. Assemble hose (43) with the 45° end of the hose on the rod end of the cylinder. Use a rectangular seal (47), two flange halves (66), four washers (57) and four bolts (60). Assemble hose (44) with the 90° end of the hose on the head end of the cylinder. Use a rectangular seal (47), two flange halves (66), four washers (57) and four bolts (60) .

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Illustration 14	g02087677

13. Assemble the guard (45) onto the tilt cylinder. Use two bolts (56), four washers (58), and two nuts (64). Assemble the hose clips (50), and (51), and grommet (52) by using bolt (62), nut (59), and washer (65) .

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Illustration 15	g02087692

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Illustration 16	g02074494

14. Assemble two hoses (42). Use existing hardware and two O-ring seals (49). Assemble two clips (50) and (51) and two grommets (52) to the outside plate on the radiator guard at location (E) by using two bolts (62) and two washers (65). Assemble the grommet (53) and the clips (54) and (55) to the rear of the blade by using two bolts (61) and two washers (63). Orient clips (54) and (55) so that the hoses are close to the back of the blade as shown in illustration 12.

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Illustration 17	g02241993

15. Assemble hose guard onto the hoses as illustrated.

    Note: The hose guard should be located between points (C) and (D) on the hoses.

    Note: The hose guard should be located between points (H) and (J) on the hoses.

    Note: The hose guard should be located between points (K) and (L) on the hoses.

Installation of the Bulldozer to the Tractor

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Illustration 18	g02087708

16. Measure the distance from the ground to the center of the trunnion on the track roller frame.

17. Raise both push arms to the height that was measured in Step 16. Support both push arms with wood blocks.

18. Move the machine into position between push arms. Stop the engine.

19. On each side of the machine, use shims (19), two bolts (31), two washers (38), and two nuts (22) in order to install cap (21) on the push arm. Make sure that the chamfer on the nuts aligns with the radius on the push arm. For instructions on shimming, refer to ""Shimming Procedure" ". Tighten the bolts to a torque of 1800 ± 200 N·m (1330 ± 150 lb ft).

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Personal injury or death can result if the lift cylinder is not secured when the lift cylinder is being attached to the blade or detached from the blade. The lift cylinders can rotate freely rearward when the cylinder rod is retracted. Secure the lift cylinder until the cylinder rod is extended in order to prevent the lift cylinder from rotating rearward.

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Illustration 19	g02242014

20. Use a cap, shims, four bolts, and four nuts to connect the lift cylinder to the bulldozer blade. For instructions on shimming, refer to ""Shimming Procedure" ". Tighten the nuts to a torque of 900 ± 100 N·m (665 ± 75 lb ft).

Necessary Parts for the LGP Machine

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Illustration 20	g02087699

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Illustration 21	g02087702

1. Assemble two hoses (68). Use existing hardware and two O-ring seals (49). Assemble two clips (50) and (51) and two grommets (52) to the front plate on the tractor at location (G) by using existing hardware. Assemble the remaining clip by using two bolts (73), four washers (71) and two nuts (72). Assemble the grommet (53) and the clips (54) and (55) to the hoses in the middle of the free length.

   Note: The hose guard should be located between points (C) and (D) on the hoses.

2. Assemble two steps (77) to the push arms. Use eight bolts (76) and eight washers (75) .

3. After the machine has been prepared for service, move the blade to the limits in each direction. Make sure that the clip that is assembled in the middle of the free length does not snag on any other parts of the tractor.