2008/01/07 Caterpillar

Wheel Tractor-Scraper:

631G (S/N: DFA1-UP)

637G (S/N: DFJ1-UP)

Description of Change: A new LH tractor fender and a support bracket is now used on certain Wheel Tractor-Scrapers. This change will prevent cracking due to stress on the current support bracket and the fender. The new design allows an additional support bracket to the front outside corner of the fender and the left rear frame outrigger.

Adaptable To: Table 1 shows the parts that are required for this procedure. This change is adaptable to the following machines:

• 631G (S/N: DFA1-330; M1W100-116)

• 637G (S/N: DFJ1-355)

1. Secure the machine and lock out the machine.

2. Remove the rubber flaps behind the cab and the LH fender. Retain hardware for later use.

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Illustration 1	g01447917
A view of fender (2) and corner fill plate (3) .

3. Remove fender (2) from the machine with hardware (1) and (4) .

4. Remove inside corner fill plate (3) from the existing fender. Retain hardware for later use.

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Illustration 2	g01446889
Dimensions of the holes that will be drilled and tapped (aa) 56 mm (2.2047 inch) (bb) 6 mm (0.2362 inch) (cc) 58 mm (2.2835 inch) (dd) 93.3 mm (3.6732 inch)

5. Drill and tap holes in outrigger (5) behind the cab with a 1/2 - 13 thread tap.

Note: Position the machine in order to give extra work clearance within the tire lugs.

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Illustration 3	g01447427
View of bracket (6), and hardware (13) and (14) .

6. Remove brake actuator (12). Retain the mounting hardware for later use.

7. Remove the old rear fender support bracket (6) and mounting hardware. New hardware (13) and (14) will be located here. Discard bracket (6) .

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Illustration 4	g01446887
View of fender shield (7), fender (10), and bracket assembly (11) .

8. Install new rear support bracket assembly (11) with four bolts (13) and four washers (14). Reinstall brake actuator (12) .

9. Before installation, assemble fender shield (7) to fender (10) with eight washers (8) and eight locknuts (9). Assemble the corner fill plate (3) that was removed on the fender (2) .

10. Install fender (10) to the machine with mounting hardware (1) and (4) .

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Illustration 5	g01446888
View of plate (15) that is installed

11. Install plate (15) with two bolts (18), four washers (16), and two nuts (17) .

12. Install plate (15) with two bolts (19) and two hard washers (20) .

13. Reinstall the rubber flaps to the side of the fender and the rear of cab with hardware that was removed.

14. Test and adjust the brakes for proper operation.