Procedure To Replace Lower Transmission Mounts{3030, 3082} Caterpillar

Landfill Compactor:

836G (S/N: BRL1-UP; 7MZ1-UP)

836H (S/N: BXD1-759)

Wheel Dozer:

834G (S/N: BPC1-UP; 6GZ1-UP)

834H (S/N: BTX1-402)

Wheel Loader:

988G (S/N: BNH1-UP; 2TW1-UP)

988H (S/N: BXY1-2908)

Introduction

A new procedure is now used in order to replace the lower transmission mounts. The new lower transmission mounts will improve strength and durability.

The following serial number ranges are equipped with the improved transmission mounts. The machines may have to have the repair completed since the machines are not equipped with the greased center driveshaft. All of the required parts listed may not be needed for the repair.

• BXD600-759

• BTX300-402

• BXY1900-2908

Do not perform any procedure that is outlined in this publication until you understand the information that is contained in this document.

Required Parts

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Illustration 1	g02176921

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Illustration 2	g02176924

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Illustration 3	g02176928

1. Disconnect two hoses (A) from the gage for the transmission located on the left side of the machine. Cap the hoses and cap the gage in order to prevent contamination. Remove two bolts from the gage and remove the gage.

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Illustration 4	g02176934

2. Remove the bracket for the transmission fill tube (B) .

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Illustration 5	g02176939

3. Remove eight bolts from the front drive shaft. Remove the drive shaft (C) .

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Illustration 6	g02176980

4. Disconnect clip (D) from the parking brake release line located above the parking brake.

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Illustration 7	g02177037

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Illustration 8	g02177041

5. Remove eight bolts from the belly guard (E). Remove the guard and both hinges.

6. Lower the guard safely to the ground using an appropriate hydraulic jack.

7. Secure the rear drive shaft yoke in order to prevent the yoke from moving.

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Illustration 9	g02177044

8. Remove eight bolts from the rear drive shaft (F) and remove the rear drive shaft .

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Illustration 10	g02177690

9. Remove six bolts from two panels (G) located above the rear wheels on the left and right side of the machine.

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Illustration 11	g02177702

10. Remove two bolts from the clips of the hydraulic lines (H) from the left and right side of the machine. The lines are located along the frame under panels (G) .

11. Remove the bolts from the top transmission mounts. Install bolts that are 127 mm (5 inch) longer.

    Note: The longer bolts are temporary and are for the guiding of the transmission as the transmission is raised in order to keep proper alignment.

12. Support the transmission with the appropriate hydraulic jack.

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Illustration 12	g02177754

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Illustration 13	g02177816

13. Remove four bolts from each of the lower transmission mounts (J). Remove the mounts.

14. Clean the area of the lower transmission mounts clear of debris and paint.

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Illustration 14	g02210734
Left side lower transmission mount

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Illustration 15	g02210774

15. Mark the frame using the center of the holes of the lower transmission plates. Repeat for right side lower transmission mount.

16. Remove the original lower transmission plates.

    Note: The lower base plate between the original lower transmission mount and the frame will not be removed. The lower base plate will remain in place on the frame.

Installation of the 304-4218 Plate

1. Install the new 304-4218 Plates . Using the holes on the plate, align the plate with the marks from Step 15.

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Illustration 16	g02210883

2. Ensure that the bevels on the plate are facing down on the frame.

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Illustration 17	g02214334
(1) 8 mm (0.315 inch) fillet weld (2) 8 mm (0.315 inch) fillet weld

3. Weld the plates into place. Use an 8 mm (0.32 inch) fillet weld.

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Illustration 18	g02214333

4. Install four 9W-9930 Mount Assemblies (4) and 2 9W-6582 Sleeves (3) into each 304-8704 Lower Support Assembly (5) .

5. Install the new 304-8704 Lower Support Assembly (5) onto the transmission. Use the four original bolts and hard washers.

6. Lower the transmission down and install the new plates to the frame. Use four 8T-6381 Bolts (6), 8T-5439 Hard Washers (7), and 7X-2622 Washers (8)

7. Tighten the 8T-6381 Bolts to a torque of 460 ± 60 N·m (339 ± 44 lb ft).

   Note: Verify that the rubber is not pinched into the joint.

8. Remove the longer bolts from the top transmission mounts from Step 11. Install the original bolts.

9. Install all hoses, brackets, plates, and drive shafts.