Repair Manual – Page 54

Replacing the upper control arm on a Komatsu WA120L-3MC Wheel Loader involves several steps. click here for more details on the download manual…..

Here’s a reverse order of the process:

### 10. Installation of Upper Control Arm
– Position the new upper control arm in place.
– Align the control arm with the mounting points on the frame and the wheel hub.
– Insert and tighten the bolts to secure the control arm. Use a torque wrench to ensure they are tightened to the manufacturer’s specifications.

### 9. Reinstallation of Other Components
– Reattach any components that were removed or disconnected to access the upper control arm, such as brake lines or electrical connections.
– Ensure all clips and fasteners are properly secured.

### 8. Wheel Assembly
– Reinstall the wheel on the hub.
– Tighten the wheel lug nuts to the specified torque.

### 7. Lowering the Loader
– Carefully lower the wheel loader back to the ground if it was supported by jack stands.

### 6. Removal of Old Control Arm
– Remove the bolts securing the upper control arm to the frame and wheel hub. You may need to tap the bolts with a hammer if they are stuck.
– Carefully take out the old control arm from its position.

### 5. Preparation Before Part Removal
– Disconnect any parts that may obstruct access to the control arm, such as brake lines or suspension components.
– If necessary, secure the wheel loader with jack stands to ensure stability and safety.

### 4. Lifting the Loader
– Use a hydraulic jack to lift the front of the wheel loader. Make sure to lift it high enough to access the upper control arm comfortably.

### 3. Gather Tools and Replacement Parts
– Acquire the necessary tools: socket set, torque wrench, wrenches, jack, jack stands, and possibly a hammer.
– Obtain the replacement upper control arm that is compatible with the Komatsu WA120L-3MC.

### 2. Safety Precautions
– Ensure the wheel loader is on a flat surface.
– Engage the parking brake and place wheel chocks around the wheels.
– Wear safety gear, including gloves download KOMATSU WA120L 3MC Wheel Loader workshop manual and eye protection.

### 1. Diagnostic Check
– Before starting, inspect the upper control arm for issues, such as excessive wear or damage, to confirm that replacement is necessary.

By following these steps in reverse order, you can ensure a thorough understanding of the entire process involved in replacing the upper control arm on a Komatsu WA120L-3MC Wheel Loader. Always consult the service manual for specific torque values and guidelines related to your equipment.
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