Replacing the planetary gear in the gearbox of a BMW 735i can be a complex task, but with a clear step-by-step guide, you can understand the general process. click here for more details on the download manual…..

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Keep in mind that this overview is simplified and assumes you have basic mechanical skills. Always refer to the vehicle’s service manual for specific instructions and safety precautions.

### Tools and Materials Needed:
– Socket set
– Wrenches
– Screwdrivers
– Torque wrench
– Transmission fluid
– Drain pan
– Clean rags
– safety glasses
– Gloves

### Step-by-Step Guide to Replace Planetary Gear in a BMW 735i Gearbox:

#### 1. **Preparation:**
– **Safety First:** Ensure the car is parked on a flat surface. Engage the parking brake and disconnect the battery to avoid electrical issues.
– **Gather Tools:** Have all the necessary tools and materials ready.

#### 2. **Remove the Transmission:**
– **Raise the Vehicle:** Use a jack to lift the car and secure it on jack stands. Make sure it’s stable before working underneath.
– **Drain Transmission Fluid:** Place a drain pan under the transmission pan and remove the drain plug or the pan itself to let the fluid drain completely.
– **Remove Components:** Disconnect any parts that may obstruct access to the transmission, such as the exhaust, driveshaft, or any electrical connectors.
– **Unbolt the Transmission:** Carefully unbolt the transmission from the engine. You may need to support the transmission with a jack to prevent it from falling.

#### 3. **Disassemble the Transmission:**
– **Remove the Transmission Case:** Once unbolted, carefully remove the transmission from the vehicle.
– **Open the Transmission Case:** Using a socket set, unbolt the transmission case. Take care to note the position of any parts as you remove them.
– **Remove the Planetary Gear Assembly:** locate the planetary gear set within the transmission. It usually consists of several gears and a carrier. Carefully remove it, noting how it is assembled for reinstallation.

#### 4. **Replace the Planetary Gear:**
– **Inspect the Gear:** Check the old planetary gear for wear and damage. If it’s worn, it needs to be replaced.
– **Install New Planetary Gear:** Place the new planetary gear into the assembly, ensuring it fits properly. Reassemble the gear set as it was originally configured.

#### 5. **Reassemble the Transmission:**
– **Reattach the Transmission Case:** Once the new gear is in place, secure the transmission case by bolting it back together.
– **Reinstall the Transmission:** Carefully lift the transmission back into place under the vehicle. Bolt it to the engine securely.
– **Reconnect Components:** Reattach any parts that were removed, including the driveshaft, exhaust, and electrical connectors.

#### 6. **Refill Transmission Fluid:**
– **Add New Fluid:** Since you drained the old fluid, you’ll need to refill the transmission with new fluid. Refer to the owner’s manual for the correct type and quantity of fluid.
– **Check for Leaks:** Before lowering the vehicle, check for any leaks around the transmission area.

#### 7. **Final Steps:**
– **Lower the Vehicle:** Remove the jack stands and lower the vehicle carefully.
– **Reconnect the Battery:** Once the vehicle is back on the ground, reconnect the battery.
– **Test Drive:** Take the vehicle for a short test drive to ensure everything is functioning properly. Monitor for any unusual noises or shifting issues.

### Conclusion:
While this guide provides a basic overview of the steps involved in replacing the planetary gear in a BMW 735i, it’s important to remember that working on a vehicle’s transmission can be challenging. If you’re unsure about any steps, it’s wise to consult with a professional mechanic or refer to the specific service manual for your vehicle. Always prioritize safety and proper technique throughout the process.
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