Replacing the gearbox seal on a Kobelco E135SR excavator might seem daunting if you have little mechanical experience, but by breaking it down into simple steps, you can understand the process better. click here for more details on the download manual…..

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Here’s a straightforward guide to help you through the gearbox seal replacement:

### Tools and Materials Needed:
1. **Tools:**
– Wrench set
– Socket set
– Screwdriver set
– Pliers
– Torque wrench
– Seal puller (if available)
– Clean cloths

2. **Materials:**
– Replacement gearbox seal (make sure it’s the correct type for your model)
– Gear oil (for refilling)
– Clean grease (for lubrication)

### Safety Precautions:
– Ensure the excavator is on a stable surface.
– Turn off the engine and remove the key.
– Wear safety gloves and goggles to protect yourself during the process.

### Step-by-Step Guide to Replace the Gearbox Seal:

1. **Prepare the Excavator:**
– make sure the excavator is parked on a level surface and the engine is turned off.
– Engage the parking brake to prevent any movement.

2. **Access the Gearbox:**
– Locate the gearbox on your Kobelco E135SR. It is usually positioned close to the tracks.
– You may need to remove any covers or protective panels to access the gearbox. Use the appropriate tools to do this.

3. **Drain the Gear Oil:**
– Place a suitable container beneath the gearbox to catch any oil that will drain out.
– Locate the drain plug on the bottom of the gearbox and use a wrench to remove it. Allow all the oil to drain completely.

4. **Remove the Old Seal:**
– Inspect the seal area to see how it is placed.
– Use a seal puller or a flat screwdriver to carefully pry out the old seal. Be cautious not to damage the surrounding surfaces.
– Clean the area around the seal thoroughly with a cloth to remove any debris or old sealant.

5. **Install the New Seal:**
– Before placing the new seal, apply a little grease around its outer edge. This helps it fit better and prevents damage during installation.
– Carefully position the new seal into the gearbox housing. make sure it is seated evenly all around.
– Use a flat surface or a seal installation tool to gently tap the seal into place, ensuring it is flush with the surface.

6. **Reassemble the Gearbox:**
– Replace any covers or panels you removed earlier.
– Reinstall the drain plug securely to prevent leaks.

7. **Refill Gear Oil:**
– Locate the fill plug on the gearbox (usually on the side).
– Using a funnel, refill the gearbox with the appropriate gear oil until it reaches the recommended level (check the operator’s manual for the exact specifications).

8. **Check for Leaks:**
– Start the engine and allow it to run for a few minutes.
– Check the area around the new seal for any signs of leaks. If everything looks good, you’re done!

9. **Clean Up:**
– Dispose of the old seal and any waste oil properly.
– Clean your tools and work area.

### Final Notes:
Replacing the gearbox seal is a manageable task with some patience and attention to detail. If you encounter any difficulties or are unsure about any step, it’s always a good idea to consult the excavator’s service manual or seek help from a professional mechanic. Regular maintenance will help ensure your Kobelco E135SR runs smoothly for years to come!
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