Replacing the input shaft bearing on a Hyundai R290LC-3 Crawler Excavator can be a complex task, but I will break it down into simple steps to make it easier to understand. click here for more details on the download manual…..

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Before you begin, ensure you have the right tools, safety equipment, and a service manual for your specific model, as it will provide important specifications and diagrams. Here’s a simplified guide on how to do it:

### Tools and Materials Needed:
– safety goggles and gloves
– Basic hand tools (wrenches, sockets, screwdrivers)
– Torque wrench
– Puller tool (for removing bearings)
– New input shaft bearing
– Clean cloths
– lubricant or grease

### Steps to Replace the Input Shaft Bearing:

1. **Safety First**:
– Ensure the excavator is on a level surface and turn off the engine.
– Engage the parking brake and make sure the hydraulic system is depressurized.

2. **Remove the Access Panel**:
– Locate the access panel for the transmission or gear casing. This is usually found on the side of the excavator.
– Use the appropriate tools to remove the bolts or screws holding the panel in place.

3. **Drain the Oil**:
– Place a drain pan underneath the transmission to catch any oil that may spill.
– Remove the drain plug and allow the oil to fully drain out.

4. **Disconnect Components**:
– Identify and Disconnect any components or hoses that may obstruct access to the input shaft bearing, such as the drive shaft or other nearby parts.
– Take pictures or make notes of how parts are arranged to help with reassembly.

5. **Remove the Input Shaft**:
– Use a puller tool to carefully remove the input shaft from its housing. Be cautious Not to damage any surrounding components during this step.
– Inspect the input shaft for wear or damage as you remove it.

6. **Remove the Old Bearing**:
– Once the input shaft is out, locate the input shaft bearing. It should be visible in the housing.
– Use a bearing puller to remove the old bearing. If it’s stubborn, you may need to apply some penetrating oil and let it sit for a while.

7. **Clean the Area**:
– Clean the bearing housing thoroughly with a clean cloth to remove any debris or old lubricant.

8. **Install the New Bearing**:
– Apply a thin layer of lubricant to the new bearing and the bearing housing.
– Carefully press or tap the new bearing into place using a soft hammer, ensuring it is seated evenly.

9. **Reinstall the Input Shaft**:
– Once the new bearing is in place, carefully reinstall the input shaft. It should slide back into the bearing smoothly.
– If applicable, secure the input shaft with any retaining clips or bolts.

10. **Reconnect Components**:
– Reattach any components or hoses that were disconnected earlier. Make sure everything is tightened to the manufacturer’s specifications.

11. **Replace the Access Panel**:
– Reattach the access panel and secure it with bolts or screws.

12. **Refill the Oil**:
– Replace the drain plug and refill the transmission with the appropriate type and amount of oil as specified in your service manual.

13. **Test the Excavator**:
– Start the engine and allow it to run for a few minutes. Check for any leaks and ensure that everything is functioning correctly.
– Test the excavator’s operation to make sure the input shaft and bearing are working properly.

### Final Notes:
– Always refer to the service manual for your specific model for torque specifications and detailed diagrams.
– If you’re uncertain about any step, it might be best to consult with a professional mechanic.
– Dispose of old oil and parts properly, following local regulations.

By following these steps carefully and methodically, you can successfully replace the input shaft bearing on your Hyundai R290LC-3 Crawler Excavator.