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Repairing the shift drum on a Daewoo Doosan S170W V is a task that requires some mechanical understanding and the right tools. The shift drum is a crucial component in the transmission system that helps to control the gear changes. Below, I will guide you through the process step by step, assuming you have no prior knowledge of mechanics.
### Tools and Materials You Will Need:
1. **Tools:**
– Socket set (with ratchet)
– Wrenches (metric sizes)
– Screwdrivers (flathead and Phillips)
– Pliers
– Torque wrench
– Hammer
– Pry bar
– Snap ring pliers
– Oil catch pan
– Clean rags
2. **Materials:**
– Replacement shift drum (if damaged)
– New gaskets or seals (if required)
– Transmission fluid (as needed)
### safety Precautions:
– **Wear safety glasses** to protect your eyes.
– **Use gloves** to protect your hands from sharp edges and hot components.
– Work in a well-ventilated area to avoid inhaling fumes.
### Step-by-Step Guide:
#### Step 1: Prepare the Machine
1. **Park the machine on a flat surface** and ensure it’s stable.
2. **Turn off the engine** and remove the key from the ignition.
3. **Disconnect the battery** to prevent any electrical shorts.
#### Step 2: Drain the Transmission Fluid
1. **Locate the transmission fluid drain plug** underneath the machine.
2. **Place an oil catch pan** underneath the drain plug.
3. **Use the correct socket or wrench** to remove the drain plug and allow the fluid to drain completely into the pan.
4. **Replace the drain plug** after the fluid has drained.
#### Step 3: Remove the Transmission Cover
1. **Locate the transmission cover** (usually on the side of the transmission).
2. **Use a socket or wrench** to remove the bolts securing the cover.
3. **Gently tap the cover with a hammer** if it’s stuck, but be careful not to damage it.
4. **Set the cover aside** in a safe place.
#### Step 4: Access the Shift Drum
1. **Identify the shift drum** inside the transmission. It looks like a cylindrical piece with grooves or notches.
2. **Take photos or make notes** of the position of any components connected to the shift drum to ensure you can reassemble them later.
#### Step 5: Remove the Shift Drum
1. **Disconnect any linkages or cables** Attached to the shift drum. Use pliers or wrenches as needed.
2. **Use the snap ring pliers** to remove any retaining rings that hold the shift drum in place.
3. **Carefully pull the shift drum out** of its housing. You may need to gently wiggle it to free it from any tight spots.
#### Step 6: Inspect the Shift Drum
1. **Examine the shift drum for damage**, such as cracks, excessive wear, or broken notches.
2. **Check the shift forks** (the components that engage with the drum) for wear or damage as well.
#### Step 7: Replace the Shift Drum (if necessary)
1. If the shift drum is damaged, **replace it with a new one**.
2. **Install the new shift drum** in the same orientation as the old one. Make sure it fits snugly.
#### Step 8: Reassemble the Transmission
1. **Reattach any linkages or cables** to the shift drum, ensuring they are secure.
2. **Replace the retaining rings** that hold the shift drum in place using the snap ring pliers.
3. **Reinstall the transmission cover**, ensuring any gaskets or seals are in good condition. Replace them if they appear worn.
4. **Secure the cover with the bolts**
and tighten them in a crisscross pattern for even pressure.
#### Step 9: Refill the Transmission Fluid
1. **Locate the transmission fill plug** (usually on the top of the transmission).
2. **Remove the fill plug** and use a funnel to pour the new transmission fluid into the transmission.
3. **Check the owner’s manual** for the correct type and amount of fluid.
4. **Replace the fill plug** once filled.
#### Step 10: Final Checks
1. **Reconnect the battery**.
2. **Start the engine** and let it run for a few minutes.
3. **Check for leaks** around the transmission cover and shift drum area.
4. **Test the gear shifting** to ensure everything is functioning correctly.
### Conclusion:
That’s it! You’ve successfully repaired the shift drum on your Daewoo Doosan S170W V. Remember, if you encounter any issues or are unsure about any steps, don’t hesitate to consult a professional mechanic or refer to the service manual for your machine. always prioritize safety and take your time to ensure everything is done correctly. Happy repairing!
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