2010/07/02 Caterpillar

Off-Highway Truck:

797F (S/N: LAJ1-UP)

Description of Change: The plate assemblies that are part of the drive shaft guard group have been trimmed. The new shape of the parts will prevent contact between the drive shaft guard group and the transmission and the torque converter. The new shape of the parts will help prevent damage to the transmission and the torque converter from the contact with drive shaft guard group.

Adaptable To: The improved 336-7751 Drive Shaft Guard Gp is now used on the 797F Off-Highway Truck. The improved 336-7751 Drive Shaft Guard Gp is adaptable to machines LAJ1-175. The improved drive shaft guard group became effective in production with the machine LAJ176-UP.

The 336-7751 Drive Shaft Guard Gp that is part machines LAJ1-175 can be updated to the improved design. Use the following procedure to update earlier drive shaft guard groups to the improved design.

1. Permit only one operator on the machine. Either keep other personnel away from the machine, or keep other personnel in the sight of the operator.

2. Move the machine to a smooth horizontal location. Move the machine away from any machines that are working and any personnel.

3. Move the transmission control to the PARK position.

4. Place blocks in front of the wheels and behind the wheels.

5. Install the truck body retaining cable.

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Illustration 1	g02173395
The 336-7751 Drive Shaft Guard Gp (1) 337-4316 Plate As (2) 336-7757 Plate As (3) 337-4313 Plate As (4) 336-7754 Plate As

6. By use of a suitable lifting device, remove the drive shaft guard group from the machine. The drive shaft guard group weighs approximately 82 kg (181 lb).

7. Remove the 337-4316 Plate As (1) from the top of the drive shaft guard group toward the torque converter.

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Illustration 2	g02173398
The 337-4316 Plate As (1) (A) 70.0 mm (2.76 inch) (B) 15.0 mm (0.59 inch)

8. Refer to Illustration 2. Trim the plate assembly. Smooth any rough cuts with a grinder to remove any sharp edges.

9. Remove the 336-7757 Plate As (2) from the bottom of the drive shaft guard group toward the torque converter.

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Illustration 3	g02173400
The 336-7757 Plate As (2) (C) 15.0 mm (0.59 inch) (E) 70.0 mm (2.76 inch) from point (D) to point (F) (G) 30.0 mm (1.18 inch)

10. Refer to Illustration 3. Trim the plate assembly. Smooth any rough cuts with a grinder to remove any sharp edges.

11. Assemble the two plate assemblies to the drive shaft guard group toward the torque converter.

12. Remove the 337-4313 Plate As (3) from the top of the drive shaft guard group toward the transmission.

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Illustration 4	g02173402
The 337-4313 Plate As (3) (J) 15.0 mm (0.59 inch) from point (H) to point (K)

13. Refer to Illustration 4. Trim the plate assembly. Smooth any rough cuts with a grinder to remove any sharp edges.

14. Remove the 336-7754 Plate As (4) from the bottom of the drive shaft guard group toward the transmission.

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Illustration 5	g02173404
The 336-7754 Plate As (4) (M) 15.0 mm (0.59 inch) from point (L) to point (N)

15. Refer to Illustration 5. Trim the plate assembly. Smooth any rough cuts with a grinder to remove any sharp edges.

16. Assemble the two plate assemblies to the drive shaft guard group toward the transmission.

17. Install the drive shaft guard group on the machine.

18. Remove the truck body retaining cable.

19. Remove blocks from in front of the wheels and behind the wheels.

20. Return the truck to service.