Download Komatsu PC300 and 350-7 shop manual and O&M manual –

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Here’s a step-by-step guide for replacing the battery on a Komatsu PC300/350-7 excavator, presented in reverse order:

### Final Steps
1. **Reconnect the Battery Cables:**
– Start by connecting the positive (+) cable first, followed by the negative (-) cable.
– Ensure that the connections are tight and secure to prevent any electrical issues.

2. **Secure the Battery:**
– If applicable, replace any battery hold-down brackets or straps to ensure that the battery is securely in place.

3. **Close the Battery Compartment:**
– If there is a cover or panel over the battery compartment, ensure it is properly closed and secured.

### Preceding Steps
4. **Remove the Old Battery:**
– Carefully lift the old battery out of the compartment. Be cautious, as batteries can be heavy.

5. **Disconnect Battery Cables:**
– Start by disconnecting the negative (-) cable first to prevent any short circuits.
– Next, disconnect the positive (+) cable.

6. **Prepare for Battery Installation:**
– clean any corrosion from the battery terminals and the cable connectors using a wire brush or battery terminal cleaner.

7. **Select the Right Replacement Battery:**
– Ensure that the new battery is compatible with the Komatsu PC300/350-7 specifications (size, voltage, and capacity).

8. **Access the Battery Compartment:**
– Open the battery compartment by removing any necessary covers or panels.

### Initial Steps
9. **Safety Precautions:**
– Before starting, ensure the excavator is turned off and parked on a flat, stable surface.
– Wear appropriate personal protective equipment (PPE), such as Gloves and safety goggles.

By following these steps in reverse order, you can successfully replace the battery in a Komatsu PC300/350-7 excavator. Always refer to the specific service manual for your machine for any additional instructions or safety warnings.
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