2006/08/14 Caterpillar

Off-Highway Truck:

793 (S/N: 3SJ1-UP)

793B (S/N: 1HL1-UP)

793C (S/N: 4AR1-UP; ATY1-UP)

Off-Highway Truck/Tractor:

793C (S/N: 4GZ1-UP)

ReferenceDisassembly and Assembly, SENR4917, "793 Truck Vehicle Systems", "Steering Arm". This module is part of Service Manual, SENR4900.

ReferenceDisassembly and Assembly, SENR5692, "793B Truck Machine Systems", "Steering Arm". This module is part of Service Manual, SENR6340.

ReferenceDisassembly and Assembly, SENR1463, "793C Off-Highway Truck Machine Systems", "Steering Arm - Remove and Install". This module is part of Service Manual, SENR1440.

ReferenceDisassembly and Assembly, RENR2535, "793C Off-Highway Truck Machine Systems", "Steering Arm - Remove and Install". This module is part of Service Manual, SENR1540.

Description of Change: A new center arm, a new lock, and a new shim pack are used in the steer linkage. The new shim pack contains three thin shims and three thick shims. The thin shims are 0.13 mm (0.005 inch) thick. The thick shims are 0.38 mm (0.015 inch) thick. The new components and a new torque procedure improve the service life of the steer linkage.

Adaptable To: The new components are direct replacements for the former components. The new components are effective with 793C (S/N: ATY429) Off-Highway Truck. See Table 1 for the part numbers. Use the following procedure to adapt the new parts to all earlier machines.

Note: Do not reuse used 8T-0656 Bolts .

1. Refer to the Disassembly and Assembly Module for the procedure to remove the steering arm.
   Show/hide table

   Table 1

   Item	Qty	New Part Number	Description	Former Part Number
   1	1	207-7321	Center Arm	135-5271
   2	1	201-4758	Shim Pack	-
   3	1	201-4759	Lock	135-5260
   4	2	8T-0656	Bolt	8T-0070

Show/hide table



Illustration 1	g00835659

Show/hide table



Illustration 2	g00835660
Section (A-A)

Show/hide table



Illustration 3	g00835726

2. Use a new 207-7321 Center Arm (1) .

3. Install 8X-1834 Pin (A), two 8T-0656 Bolts (4), and two 8T-3282 Hard Washers (B) .

4. Tighten the bolts to a torque of 250 ± 10 N·m (185 ± 8 lb ft). Check the torque of the previous bolt. Continue to check the torque until the bolts do not move at a torque of 250 ± 10 N·m (185 ± 8 lb ft).

5. Slip 201-4759 Lock (3) and 201-4758 Shim Pack (2) into the center slot. Use as many thick shims and thin shims as necessary. Install the shims and the lock while the bolts are torqued.

6. Loosen and remove the bolts (4). Install lock (3) with the previously determined shims (2). Add one additional thin shim.

   Note: Do not use more than two thin shims in the final pack. If three thin shims are required, substitute one thick shim for the three thin shims.

7. Install the bolts and washers.

8. Tighten the bolts to a torque of 350 ± 10 N·m (258 ± 8 lb ft). Check the torque of the previous bolt. Continue to check the torque until the bolts do not move at a torque of 350 ± 10 N·m (258 ± 8 lb ft).

9. Turn the first bolt by an additional 90 to 100 degrees.

10. Mark the second bolt and torque the second bolt to 250 ± 10 N·m (185 ± 8 lb ft). If the bolt turns go to Step 6 and add an additional thin shim. If the bolt did not turn, turn the second bolt by an additional 90 to 100 degrees.