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  1. S

    Komatsu D31 P Dozer only powers one track

    Thanks for the great run-through. I found the dipsticks for the steering clutches and they were really low-between the transmission and the 2 steering clutches I used almost a gallon. I hoped that might get things moving again but it didn't. I've considered the steering clutches but it is only...
  2. S

    Komatsu D31 P Dozer only powers one track

    Machine has worked well for 10 years. Suddenly when I was pushing snow, R track quit working. L track will spin dozer in circles all day. R track just stalled. My guess is steering clutch. Anyone have confirmation or another thought? Thanks. Smedlow
  3. S

    Komatsu 31 steering

    Yesterday I was pushing snow in my D31-P and suddenly the right track quit driving. With the left track I can spin the machine forward or backward, but nothing on the right track. Is the right side steering clutch the most likely culprit? I'm afraid it's gonna have to wait until the snow goes...
  4. S

    Komatsu PC75UU-2 Injection Pump Timing

    Just because nothing goes as smoothly as it should, I started the motor and let it run to check for leaks. Sure enough, there was a leak running down the plate at the front of the pump. I looked at the book to see what might be leaking and saw that an o ring goes around the nose of the pump. I...
  5. S

    Komatsu PC75UU-2 Injection Pump Timing

    I started it again today and it seemed to run fine. I looked at the side of the pump and the plate it mounts to and found a hash mark on both. I was running it about 1/8" misalignment between the hash marks. I moved the pump to align the marks and tightened it down. It started fine and seemed...
  6. S

    Komatsu PC75UU-2 Injection Pump Timing

    My 1994 PC75UU-2, Serial number 8310, Engine Model # 4D95L-1, was belching black smoke and spilling fuel into the crankcase. Air filter was clean. Started well, ran well, but smoked under even a light load. Injectors were just rebuilt. Decided it was the Injection Pump. Took it off, sent it away...
    • Smedlow
    • Thread
    • injection pump komatsu pc75uu-2
    • Replies: 4
    • Forum: Excavators
  7. S

    Komatsu PC75uu-2 pump parts

    Several years ago my pump went belly up and, as you said, it was a Uchica-Rexroth pump. I bought a replacement (rebuilt) from the outfit I bought the Excavator from, and they charged me $8000, delivered in Alaska. I installed it and the pump has run fine, but pieces of the old pump were all...
  8. S

    Komatsu PC75uu-2 Starter Problem

    Thanks for your reply, Randy88. The darn thing is starting now since I hotwired the starter. I know that is likely a temporary condition, but I haven't had time to tear it down yet. I am sending in an oil sample for analysis. Great suggestions!
  9. S

    Komatsu PC75uu-2 Starter Problem

    1. My 1994 PC75UU-2, Serial number 8310, Engine Model # 4D95L-1, was getting harder to start. I replaced the batteries but still turned over slow. Had a friend try and start while I watched and fire/smoke came out of the rear of the starter motor. Now it won't turn over at all. I suspect the...
    • Smedlow
    • Thread
    • oil level pc75uu-2 starter
    • Replies: 3
    • Forum: Excavators
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