Komatsu PC50UU-1 Troubleshooting and Parts Help

[MikePhua]

Initial Problem
A user reached out for help with a Komatsu PC50UU-1 mini excavator that had several mechanical issues. The main concern was a broken track adjuster spring that needed replacement. The user asked where to find replacement parts and how to tackle the repair.
Parts Availability
Several people responded, explaining that parts for the older PC50UU-1 model can be tricky to find since it’s a Japanese domestic model. Suggestions included checking with local Komatsu dealers, looking for used parts suppliers, or searching online for grey market importers who specialize in Japanese equipment.
Repair Advice
One experienced member gave advice on how to safely disassemble the track adjuster and replace the spring. Emphasis was placed on safety due to the high tension stored in the recoil spring. It was suggested to consult the service manual for step-by-step procedures and to use proper tools to avoid accidents.
Additional Tips
Others shared that it might be easier to buy a complete used adjuster assembly instead of just the spring. Some noted that local hydraulic shops could sometimes rebuild or fabricate needed parts if OEM replacements were not available.
Final Thoughts
Maintaining an older Komatsu PC50UU-1 can be challenging due to limited parts availability outside Japan. However, with careful research, help from specialized suppliers, and advice from experienced operators, repairs like a broken track adjuster can be completed safely and effectively.