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komatsu d65e-6 steering problem

brads komatsu ยท 2020-09-17 18:55

hi everybody Im new to this forum, just purchased a 79model d65e-6 with some issues to fix, the tractor moves forward and reverse and all three gear shifts but when you pull on left hand clutch lever and apply brake pedal the tractor stops dead and doesnt move and if you pull hard and stand on pedal it gets a pumping motion on the pedal??? tractor turns to the right with no problems at all, I have pulled the filter and the oil has that metallic sheen to it but no signs of chunky metal will i be looking at the steering clutch packs or brake bands?? waiting on a shop manual from komatsu australia before i open this can of worms, any help will be appreciated thanks

Replies7
  1. #1Dave Neubert2020-09-18 06:55

    Put a gauge in the steering valve there is a 1/8 plug at the back see what your pressure is doing

  2. #2brads komatsu2020-09-18 17:21

    Thanks dave, i will have to buy a test gauge hopefully find one in small town i live in, what sort of pressure reading am i looking for?

  3. #3Dave Neubert2020-09-18 17:47

    250=300 psi

  4. #4Don Shilling2020-09-18 22:37

    Brad, be careful with that test port plug. Komatsu uses the JIS metric threads and fittings. JIC won't work.

  5. #5Dave Neubert2020-09-19 15:26

    You are right it is a pipe plug and you can get a 1/8 nipple in there but only by a few threads It is like a metric pipe

  6. #6brads komatsu2020-09-21 05:50

    Thanks guys for the heads up about test port, spent the weekend cleaning and began dismantling , going in to steer clutches, brake pads have about 1/4 inch of pad left and hydraulic control valve has checked out ok after dismantling and inspecting, unfortunatly back to work so next weekend will get clutchs out, thanks

  7. #7hitmix3002023-09-29 13:01

    did you get this dozer fixed? where did you get the parts i am working on a 78