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Here’s a detailed step-by-step guide for replacing the water pump on a Kobelco SK115 or SK135 excavator, including descriptions of the tools you may need:
### Preparation
– **Safety Gear**:
– Wear safety glasses, gloves, and steel-toed boots to protect yourself during the maintenance process.
– **Workspace**:
– Ensure you have a clean, well-lit workspace with sufficient room to maneuver around the excavator.
### Tools and Materials Needed
– **Wrenches and Sockets**:
– A set of metric wrenches and sockets (typically 10mm to 19mm) will help you remove bolts and nuts securing the water pump.
– **Ratchet and Extension**:
– A ratchet with an extension can be useful for reaching bolts that are in tight spaces.
– **Screwdrivers**:
– Flathead and Phillips screwdrivers may be required for removing any clamps or covers.
– **Pliers**:
– Needle-nose and regular pliers can help in removing hose clamps or manipulating hoses.
– **Coolant Drain Pan**:
– To catch any coolant when removing the water pump and hoses.
– **Replacement Water Pump**:
– Ensure you have the correct model-specific replacement water pump.
– **Gasket or Sealant**:
– A new gasket or sealant for the water pump to ensure a proper seal when installed.
– **Torque Wrench**:
– To ensure bolts are tightened to the manufacturer’s specifications.
– **Cleaning Supplies**:
– Rags, a scrubbing pad, and solvent to clean the mounting surface before installing the new pump.
### Step-by-Step Replacement Process
– **Disconnect the Battery**:
– Disconnect the negative terminal of the battery to prevent any electrical accidents while working on the machine.
– **Drain Coolant**:
– Place a coolant drain pan under the radiator. Open the drain valve or remove the lower radiator hose to drain the coolant completely.
– **Remove Hoses**:
– Using pliers, loosen and remove the hose clamps from the water pump inlet and outlet hoses. Carefully slide the hoses off the pump and place them aside.
– **Remove Accessory Belts**:
– If necessary, remove any belts that may obstruct access to the water pump. Use a wrench to loosen the tensioner and slide the belts off.
– **Unbolt the Water Pump**:
– Using the appropriate size socket and ratchet, remove the bolts securing the water pump to the engine. Keep track of the bolts for reinstallation.
– **Remove the Old Pump**:
– Gently pull the water pump away from the engine block. Inspect the old pump for any signs of wear or damage.
– **Clean Mounting Surface**:
– Use a rag and solvent to thoroughly clean the mounting surface on the engine block to remove any old gasket material or sealant.
– **Install the New Water Pump**:
– Place the new gasket onto the new water pump (or apply sealant if required). Position the new pump onto the engine block.
– **Bolt the Water Pump**:
– Hand-tighten the bolts to secure the pump in place. Then use a torque wrench to tighten the bolts to the manufacturer’s specified torque settings, ensuring even pressure across the pump.
– **Reconnect Hoses**:
– Reattach the inlet
and outlet hoses to the new water pump, securing them with hose clamps.
– **Reinstall Belts**:
– If you removed any belts, reinstall them by sliding them back onto the pulleys and adjusting the tension as necessary.
– **Refill Coolant**:
– Refill the coolant system with the appropriate type and mixture of coolant, following the manufacturer’s specifications.
– **Reconnect the Battery**:
– Reconnect the negative terminal of the battery.
– **Check for Leaks**:
– Start the engine and allow it to run for a few minutes. Check the water pump and surrounding areas for any signs of leaks.
– **Final Inspection**:
– Ensure all tools and materials are removed from the work area. Double-check that all connections are secure and the coolant level is adequate.
### Conclusion
– **Dispose of Old Coolant**:
– Properly dispose of any old coolant and materials according to local regulations.
By following these steps and using the right tools, you should be able to successfully replace the water pump on a Kobelco SK115 or SK135 excavator. Always refer to the specific service manual for your machine for detailed instructions and torque specifications.
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