Replacing the input shaft bearing on a Kobelco K905LC II excavator involves several steps, and it’s important to follow the manufacturer’s guidelines for safety and accuracy. click here for more details on the download manual…..
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Below is a detailed description of the components and the process involved in replacing the input shaft bearing.
### Components Involved:
1. **Input shaft Bearing**: This is the bearing that supports the input shaft and allows it to rotate smoothly. It is crucial for the proper functioning of the drivetrain.
2. **Input Shaft**: The shaft that transmits power from the engine to the drivetrain. It connects to the transmission.
3. **Bearing Housing**: This is the component that holds the input shaft bearing in place. It is often bolted to the transmission case.
4. **Gasket/Seals**: Gaskets and seals prevent leaks and keep contaminants out of the bearing housing.
5. **Fasteners**: Bolts and nuts that secure the bearing housing and other components.
6. **Tools**: Common tools required for this job include wrenches, sockets, a bearing puller, a hammer, a torque wrench, and possibly special tools designed for bearing installation.
### Tools Required:
– Socket set
– Wrench set
– Torque wrench
– Bearing puller
– Hammer
– Screwdrivers
– Pliers
– Clean cloths
– Lubricant (grease or oil)
– Safety equipment (gloves, goggles)
### Step-by-Step Replacement Procedure:
1. **Safety Precautions**:
– Park the excavator on a flat surface and engage the parking brake.
– Disconnect the battery to prevent any electrical hazards.
– Use safety glasses and gloves for protection.
2. **Remove the Cover**:
– Locate the cover over the input shaft bearing. This may involve removing access panels or covers.
– Use the appropriate tools to remove any bolts or fasteners securing the cover.
– Carefully lift off the cover and set it aside.
3. **Drain Transmission Fluid**:
– If necessary, drain the transmission fluid to prevent spills during the bearing replacement.
– Locate the drain plug on the transmission case and remove it to allow the fluid to drain completely.
4. **Remove the Input Shaft**:
– Depending on the design, you may need to remove other components or parts that obstruct access to the input shaft.
– Use a bearing puller to remove the input shaft from its position if it is stuck.
– Gently tap it out with a hammer if necessary, ensuring that you do not damage any surrounding components.
5. **Remove the Old Bearing**:
– Once the input shaft is out, access the bearing housing where the input shaft bearing is located.
– Use the bearing puller to remove the old input shaft bearing. Be careful not to damage the bearing housing.
– Inspect the bearing housing for any signs of wear or damage.
6. **Clean the Area**:
– Clean the bearing housing
and the surrounding area to remove any debris or old gasket material.
– Use a clean cloth and appropriate cleaning solution if necessary.
7. **Install the New Bearing**:
– Apply a thin layer of lubricant to the new input shaft bearing.
– Carefully place the new bearing into the bearing housing.
– Use a bearing installation tool or a soft-faced hammer to tap the bearing into place gently. Ensure it is seated evenly.
8. **Reinstall the Input Shaft**:
– Align the input shaft with the new bearing and insert it back into position.
– Ensure it is seated correctly and rotates smoothly.
9. **Reattach the Cover**:
– If there is a gasket or seal, replace it with a new one to prevent leaks.
– Reattach the cover over the input shaft bearing and secure it with the appropriate fasteners.
– Torque the bolts to the manufacturer’s specifications.
10. **Refill Transmission Fluid**:
– If you drained the transmission fluid earlier, refill it to the appropriate level.
– Check for any leaks around the newly installed bearing.
11. **Reconnect the Battery**:
– Reconnect the battery and ensure all electrical connections are secure.
12. **Test the Excavator**:
– Start the excavator and perform a test run to ensure everything is functioning correctly. Listen for any unusual noises and check for leaks.
### Conclusion:
Replacing the input shaft bearing on a Kobelco K905LC II excavator requires careful attention to detail and adherence to safety protocols. Following these detailed steps will help ensure a successful replacement. Always consult the operator’s manual or service manual for specific torque values and additional procedures related to your excavator model.
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