(Revised April 2001)
U-173
A-133
O-157

June 30, 2002

The case and frame bottom guards need to be replaced on certain D6M Track Type Tractors. Under some working and soil conditions, cracks may occur in the frame. Those cracks are located in frame arms, at rear bottom guard strips. Those cracks are initialized and developed in frame arms, at the rear end of the rear bottom guard strips, where those strips are welded on the side arm plates. There may also be cracks in the same area, but starting in the front part of the bottom guard strips. (See illustration in the rework procedure for crack locations).

D6M 2RN1-642
3WN1-2384
4JN1-2131
9ZM1-702

D6M XL 5WR604

6LR521

2YS466

4HS664

D6M LGP 5NR439

4GS290

12 - 6c9149/">6C9149 Washer
4 - 8G3497 Boss
12 - 6v3532/">6V3532 Bolt
2 - 1857388 Bracket - Bottom Guard

See the attached Rework Procedure.

Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.

List of parts needed:

Part 1: backup strips ? Qty: 2

Part 2: bosses 8G3497 ? Qty: 4

Part 3: inner frame plates ? Qty: 2

Part 4: bottom guard bracket 185-7388 ? Qty: 2

Part 5: front gussets ? Qty: 2

Part 6: rear gussets ? Qty: 2

Part 7: bolt head protections ? Qty: 6

Part 8: washers 6c9149 ? Qty: 12

Part 9: 6v3532 for Std & Heavy Duty Bottom Guards ? Qty: 12

1. Remove all hydraulic lines to facilitate side plate removal:



2. Remove belly guard support bars and discard:



3. Remove side plates from frame rails both sides, 250-mm up from bottom of plates :





4. Grind surface area smooth where new plate is to be installed.
5. Cut 2 backup strips 575 mm long from ?" x 1" or 6 mm x 25 mm material (Part 1). When putting backup strips in place, leave a gap of 3mm between the strip ends and the slab frame.
6. Tack weld backup strips in place.





7. Position 8G3497 bosses (Part 2) to outside plate of main frame and weld in place.





8. Weld new inner frame plates (Part 3) in place, leave 8mm gap at top to allow weld penetration into backup strip. Plug weld bosses to side frame, fill and grind flat.







9. Weld belly guard supports (Part 4) in place, 109 mm from the bottom of the frame rail, and rearmost bolt hole 95 mm from the vertical front plate of Case (foremost bolt hole 95 mm from the inverted-U cross member).



10. Weld the front gussets (Parts 5) between the belly guard support (part 4) and the 50 mm slab rail, 30 mm away from the cross member.



11. Weld the rear gussets (Parts 6) between the belly guard support (part 4) and the 50 mm slab rail, 50 mm away from the front wall of the Case.

1. Replace weld bosses for lines on right side. Reinstall hydraulic lines and clips.

1. Remove the bolt head protections, and plug all holes carefully with weld. Grind the surface smooth (both sides). Make new holes as indicated here below.

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2. For Standard Bottom Guard : trim the reinforcements a few millimeters as needed to fit within the Case & Frame.
3. For Heavy Duty Bottom Guard : remove carefully the outside stiffeners, shorten the lateral ones by 13 mm at each extremity (26 mm total), and reweld the outside stiffeners.



4. Standard & HD: install new bolt head protections (Part 10) according to the drawing above.
5. Reinstall the bottom guard with the new washers and bolts. Use 6v3532 bolts for standard and Heavy Duty bottom guards.

Description: 575 mm long bar from ?" x 1" or 6 mm x 25 mm material