Applicable Systems
PC200 Excavator
Symptoms
Reverse clutch slipping; machine does not move backward properly; transmission shudders in reverse.
Possible Causes
- Reverse clutch disc wear beyond limit
- Clutch hydraulic pressure low
- Clutch seal ring damage causing internal leak
Troubleshooting Steps
- Step 1: Check reverse clutch hydraulic pressure
Pressure within spec (2.0-2.5 MPa) - Step 2: Inspect clutch oil for contamination
Oil clean, no burnt smell - Step 3: Measure clutch pack clearance
Clearance within wear limit - Step 4: Replace clutch discs and seal rings if worn
New discs and seals installed - Step 5: Clear code and test reverse operation under load
Reverse engages smoothly, no slip
How to Reset
Clear via service monitor after clutch repair; requires transmission teardown.
Common Replacement Parts
- Reverse Clutch Disc Kit P/N: 705-99-78100
- Clutch Seal Ring P/N: 705-99-78200
Frequently Asked Questions
- Q: Can I continue operating with slipping reverse clutch?
No. Continued operation will cause clutch plate warping and metal contamination, leading to complete transmission failure.
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Source: komatsufaultcodes.com
Category: Heavy Equipment
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