Introduction
Use the procedure that follows in order to adjust the axle housing and bearing preload. Use the same procedure for both axles.
Reference: For information regarding the removal and installation of the kingpins for the axle, refer to the Power Train, Disassembly and Assembly, "Final Drive and Wheel - Remove" and the Power Train, Disassembly and Assembly, "Final Drive and Wheel - Install" for your machine.
Procedure
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
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When testing and adjusting the transmission and power train, move the machine to an area clear of obstructions, with safe exhaust ventilation for the exhausts. Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine. To prevent possible injury, do the procedure that follows before testing and adjusting the transmission and power train. |
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- Move the machine to a smooth, horizontal location that is away from operating machines and away from personnel.
- Permit only one operator on the machine. Keep all other personnel away from the machine or in the operator's sight.
- Move the transmission control to the NEUTRAL position.
- Lower the boom. If equipped, lower the work tool to the ground.
- Engage the parking brake and stop the engine.
- If the machine is in a confined area, ensure that exhaust gases are vented to the outside when the engine is operated.
- Make sure that all the oil pressure is released before you perform any of the following procedures:
- Loosen any fitting, any hose, or any component.
- Tighten any fitting, any hose, or any component.
- Remove any fitting, any hose, or any component.
- Adjust any fitting, any hose, or any component.
- Loosen any fitting, any hose, or any component.
Adjustment Procedure
- Install bearing (6), seal (7) and dust cap (8) onto kingpin (9). Install the kingpin assembly. Secure the kingpin assembly with four bolts (10). Do not torque bolts (10) fully at this stage.
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| Illustration 1 | g01039668 |
Axle and Housing (1) Bearing (2) Seal (3) Dust cap (seal) (4) Kingpin (5) Bolt (6) Bearing (7) Seal (8) Dust cap (seal) (9) Kingpin (10) Bolt (11) Knuckle (K) Clearance dimension | |
- Install bearing (1), seal (2) and dust cap (3) onto kingpin (4). Install the kingpin assembly. Do not install shims at this stage.
- Install four bolts (5). Tighten the bolts evenly until the steer knuckle rolling torque is 26.5 ± 3.5 N·m (235 ± 31 lb in).
- Use a feeler gauge and measure the gap between the kingpin and the steering knuckle in three places (K) .
- Average the three measurements in order to get the required shim thickness.
- Remove the top kingpin and install the shim. Reassemble the kingpin and torque the bolts to 190 N·m (140 lb ft).