Author: Peter

Replacing a control arm on a Komatsu D85EX-15E0 or D85PX-15E0 dozer requires careful attention to detail, as this is a crucial component for the machine’s operation. click here for more details on the download manual…..

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Below, I’ll outline a simplified step-by-step process that should help you understand the basics of the replacement. Always consult the machine’s manual for specific details and safety guidelines.

### Tools and Materials Needed:
– Wrenches and sockets (specific sizes will vary)
– Torque wrench
– Screwdrivers
– Pry bar
– Hammer
– Jack and jack stands
– Replacement control arm
– Safety gear (gloves, safety glasses)

### Step-by-Step Guide:

1. **Safety First**:
– Turn off the dozer and ensure it is on a flat, stable surface.
– Engage the parking brake to prevent movement.
– Wear safety glasses and gloves to protect yourself.

2. **Lift the Dozer**:
– Use a jack to lift the side of the dozer where the control arm will be replaced.
– Secure it with jack stands to ensure it doesn’t fall while you’re working.

3. **Remove the Wheel (if applicable)**:
– If the control arm is connected to a wheel, you may need to remove the wheel. Use a wrench or socket to remove the lug nuts and then take off the wheel.

4. **Inspect the Control Arm**:
– Before removing the old control arm, take a moment to inspect it. This will help you understand how it is connected and where the bolts are located.

5. **Disconnect the Control Arm**:
– Locate the bolts that attach the control arm to the frame and the axle (or other component it’s connected to).
– Use the appropriate wrench or socket to remove these bolts. If they’re stuck, a little penetrating oil can help.
– If necessary, use a pry bar to help free the control arm from its mounting points.

6. **Remove the Old Control Arm**:
– Carefully take out the old control arm. You may need to wiggle it a bit or tap it gently with a hammer to dislodge it.

7. **Install the New Control Arm**:
– Position the new control arm in place.
– Align it with the mounting points in the frame and the axle.
– Start by hand-tightening the bolts to hold the arm in place, but don’t fully tighten them yet.

8. **Secure the Control Arm**:
– Once the control arm is in place and the bolts are hand-tight, use a torque wrench to tighten the bolts to the manufacturer’s specified torque settings (check your manual for the exact numbers).

9. **Reattach the Wheel (if applicable)**:
– If you removed the wheel, place it back on the hub and hand-tighten the lug nuts. Then, use the torque wrench to tighten them to the specified torque.

10. **Lower the Dozer**:
– Remove the jack stands and carefully lower the dozer back to the ground.

11. **Final Inspection**:
– Double-check all bolts to ensure they are tight.
– Inspect the area around the control arm for any tools or parts left behind.

12. **Test the Dozer**:
– Start the machine and do a quick test to ensure everything is functioning correctly.

### Conclusion:
Replacing a control arm can be a straightforward task if you follow these steps carefully. However, if at any point you feel unsure, it’s advisable to consult a professional mechanic or refer to the service manual for more detailed instructions. Proper maintenance and repairs are vital for the longevity and safety of your dozer.
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