Replacing leaf springs on a Hitachi EX750 or EX800H excavator is a complex task that requires careful attention to detail and safety. click here for more details on the download manual…..
- Belparts Hot sell product final drive travel motor hydraulic pump Quality Excavator Hydraulic Pump from China.
Below is a detailed guide on how to conduct this replacement, including the necessary components and tools involved.
### Tools and Equipment Required
1. **Safety Equipment:**
– Safety goggles
– Heavy-duty gloves
– Steel-toed boots
– Hard hat
2. **Tools:**
– Socket and wrench set (including large sizes for heavy nuts/bolts)
– Torque wrench
– Pry bar
– Hydraulic jack and jack stands
– Hammer
– Screwdrivers (flat and Phillips)
– Pliers
– Impact wrench (optional But recommended for large bolts)
– Measuring tape
3. **Replacement Parts:**
– Leaf springs (ensure they are compatible with EX750/EX800H models)
– Spring bushings and eye bolts (if required)
– mounting hardware (washers, nuts, bolts)
– Lubricant (grease or anti-seize compound)
### Procedure
#### Safety Precautions
1. **Park the Excavator:**
– Ensure the excavator is parked on a level surface.
– Engage the parking brake and turn off the ignition.
2. **Safety Check:**
– Use wheel chocks to prevent movement.
– Wear all safety equipment.
#### Step-by-Step Replacement Process
1. **Prepare the Work Area:**
– Clear the area around the excavator, ensuring enough space to work.
2. **Lift the Excavator:**
– Use a hydraulic jack to lift the excavator safely.
– Place jack stands securely under the frame to support the machine.
3. **Remove the Old Leaf Spring:**
– **Identify the Leaf Spring Assembly:** Locate the leaf spring assembly attached to the undercarriage of the excavator.
– **Inspect for Fasteners:** Look for bolts securing the leaf spring to the frame and axle.
– **Remove Bolts:**
– Use a socket wrench or impact wrench to remove the nuts and bolts.
– If bolts are rusted or stuck, apply penetrating oil and allow it to soak before attempting removal.
– **Disconnect the Leaf Spring:**
– Once the bolts are removed, carefully pry the leaf spring away from its mounting points using a pry bar.
– Be cautious of any tension in the springs; they may spring out if not handled properly.
4. **Prepare and Inspect Components:**
– **Inspect mounting Points:** Check the mounting brackets for any signs of wear or damage. Clean any dirt or rust from the surfaces.
– **Inspect Bushings:** Remove and inspect the bushings; replace if damaged or worn.
5. **Install New Leaf Spring:**
– **Align the New Leaf Spring:** Position the new leaf spring in place, ensuring it is aligned with the mounting points.
– **Insert Bushings and Bolts:** If new bushings are included, insert them into the spring eyes before bolting.
– **Secure the Leaf Spring:**
– Insert bolts through the spring eyes and into the mounting brackets.
– 
Hand-tighten the nuts to hold the assembly in place.
6. **Torque Specifications:**
– Use a torque wrench to tighten the bolts to the manufacturer’s specified torque settings. Refer to the service manual for the correct specifications.
7. **Recheck Alignment:**
– Ensure the leaf spring is properly aligned and seated against the mounting points.
8. **Lower the Excavator:**
– Carefully remove the jack stands and lower the excavator using the hydraulic jack.
9. **Final Inspection:**
– After lowering, double-check all bolts and connections for tightness.
– Inspect the leaf spring installation for any misalignments.
10. **Test the Excavator:**
– Start the excavator and allow it to operate at low speed.
– Observe the suspension for any unusual noises or behavior.
– Ensure that the ride height and stability are within normal parameters.
### Conclusion
Replacing the leaf springs on a Hitachi EX750 or EX800H excavator is a demanding task that requires proper tools and safety precautions. Always refer to the manufacturer’s service manual for specific torque settings and additional instructions. If you are not confident in performing this task, consider seeking assistance from a qualified technician. Proper maintenance and timely replacements will ensure the longevity and performance of your excavator’s suspension system.
The radiator drain plug is a crucial component found in the cooling system of an internal combustion engine. Its primary function is to facilitate the removal of coolant from the radiator, which is essential for maintenance tasks such as flushing the cooling system and replacing old coolant. Typically made of plastic or metal, the drain plug is located at the lowest point of the radiator, allowing gravity to assist in the complete drainage of coolant.
During routine maintenance, such as coolant changes or system flushes, mechanics or vehicle owners can open the drain plug to allow the old coolant to flow out easily. This process helps remove contaminants, rust, and debris that may have accumulated over time, ensuring optimal cooling performance and preventing overheating issues.
The drain plug is usually threaded, allowing it to be securely fastened to prevent leaks when closed. It’s important to check the condition of the plug regularly, as over time, it can become worn, cracked, or corroded, leading to potential coolant leaks. In some vehicles, the drain plug may also be equipped with a sealing washer or O-ring to enhance its sealing capabilities. Proper maintenance of the radiator drain plug is essential for the longevity of the cooling system and the overall health of the engine.