Replacing the output shaft seal on a Liebherr A902 hydraulic excavator involves several steps and requires specific tools and safety precautions. find more details on the download manual…..
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- Liebherr 902 in Aktion
Below is a detailed guide presented in bullet points:
– **Safety Precautions**
– Ensure the excavator is on a level surface and the engine is turned off.
– Engage the parking brake to prevent any movement during the repair.
– Use appropriate personal protective equipment (PPE), including gloves, safety glasses, and steel-toed boots.
– Disconnect the battery to avoid any electrical hazards during the procedure.
– **Gather Required Tools and Materials**
– **Wrenches:** A set of metric wrenches will be needed for loosening and tightening bolts.
– **Socket Set:** A ratchet and socket set, particularly metric sizes, for various bolts and nuts.
– **Torque Wrench:** For ensuring that bolts are tightened to the manufacturer’s specifications.
– **Seal Puller:** A specialized tool designed to remove seals without damaging the surrounding components.
– **Flathead and Phillips Screwdrivers:** For any screws that may need to be removed.
– **Pry Bar:** To help in the removal of stuck components if necessary.
– **Clean Rags:** For cleaning and wiping down surfaces.
– **Sealant:** If required, use a suitable sealant for hydraulic applications.
– **Replacement Output Shaft Seal:** Ensure you have the correct part specific to the Liebherr A902 model.
– **Preparation for Seal Replacement**
– **Access the Output Shaft:**
– Remove any coverings or panels that may obstruct access to the output shaft.
– If necessary, consult the service manual for specific disassembly Instructions related to your model.
– **Drain Hydraulic Fluid**
– Position a drain pan beneath the hydraulic system.
– Open the drain valve to allow the hydraulic fluid to drain completely, preventing spills and contamination.
– **Remove the Output Shaft Assembly**
– **Unbolt the Assembly:** Using the appropriate wrenches or sockets, carefully remove the bolts securing the output shaft assembly.
– **Disconnect Any Hoses:** If there are hydraulic lines connected to the assembly, use appropriate tools to disconnect them while being cautious of residual fluid.
– **Gently Pull the Assembly Out:** Use the pry bar if necessary to help ease the output shaft assembly out of its housing.
– **Remove the Old Seal**
– **Inspect the Shaft:** Before removing the seal, inspect the shaft for any damage or wear.
– **Use Seal Puller:** Insert the seal puller behind the old seal and carefully extract it from its housing. Take care not to damage the surrounding area.
– **Clean the Seal Area**
– **Wipe Down the Housing:** Use clean rags to remove any debris, old sealant, or dirt from the seal housing.
– **Check for Wear:** Inspect the seal housing for any scratches or damage that could affect the new seal’s performance.
– **Install the New Output Shaft Seal**
– **Lubricate the Seal:** Apply a small amount of hydraulic fluid or grease to the new seal to facilitate installation.
– **Position the Seal:** Carefully place the new seal into the housing, ensuring it is aligned properly.
– **Use a Seal Driver:** If available, use a seal driver to press the seal evenly into place, making sure it is seated correctly without tilting.
– **Reassemble the Output Shaft Assembly**
– **Reattach the Shaft:** Carefully reinsert the output shaft assembly back into position, ensuring it aligns with the housing properly.
– **Reconnect Hoses
and Bolts:** Securely bolt the assembly in place and reconnect any hydraulic hoses or lines that were previously disconnected.
– **Refill Hydraulic Fluid**
– **Fill the System:** Using the manufacturer’s recommended hydraulic fluid, refill the hydraulic system to the appropriate level.
– **Check for Leaks:** Before starting the excavator, inspect the area around the new seal and connections for any signs of leaks.
– **Test the System**
– **Start the Engine:** Reconnect the battery and start the excavator’s engine.
– **Observe Functionality:** Operate the hydraulic system and observe for any abnormal noises, leaks, or performance issues.
– **Final Checks**
– **Inspect the Area Again:** After running the machine for a short period, stop and check the seal area once more for any signs of leakage.
– **Document the Work:** Record the replacement in the maintenance log for future reference.
This process should ensure successful replacement of the output shaft seal on a Liebherr A902 hydraulic excavator, maintaining its performance and preventing fluid leaks. Always refer to the specific service manual for additional details and specifications related to your machine model.
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