Applicable Systems
PC200 Excavator
Symptoms
Swift parking brake not releasing properly; swing function may be restricted or noisy.
Possible Causes
- Swing parking brake solenoid failure
- Brake disc wear beyond limit
- Brake control relay faulty
Troubleshooting Steps
- Step 1: Check swing parking brake solenoid operation
Solenoid clicks audibly on activation - Step 2: Measure brake solenoid resistance
Resistance 20-30 ohm typical - Step 3: Inspect brake disc thickness (min 3.0mm)
Disc thickness above minimum - Step 4: Replace solenoid if resistance out of spec
New solenoid resistance nominal - Step 5: Clear code and verify swing brake release
Brake releases smoothly, no drag
How to Reset
Clear via monitor panel after repair.
Common Replacement Parts
- Swing Brake Solenoid P/N: 705-21-72120
- Swing Brake Disc Kit
Frequently Asked Questions
- Q: Can I operate with E03 active?
Machine should be withdrawn from service immediately. E03 is a safety-related fault per Komatsu tier system.
Source: safequarry.com incident report + komatsufaultcodes.com
Category: Heavy Equipment