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One for the Komatsu men

Irish in oz ยท 2014-01-10 02:36

On a Komatsu pw160 rubber duck (wheel excavator) has anybody ever come across a jumpy pilot system? All the controls go smooth then every couple of seconds give a bad jerk. It happens in both control levers and can be felt in the brake pedal too? It seems to be not as bad with the park brake applied?

Replies8
  1. #1mikebramel2014-01-10 18:07

    Make sure that the pump is not cavitating

  2. #2Irish in oz2014-01-11 02:04

    You reckon pilot pump is cavitating? Just strange that the park brake affects it

  3. #3The Learner2014-01-11 04:04

    faulty park brake pilot system id guess park brake is normally spring applied so if fault occurs with park brake off id be looking for leaks or bypassing in park control system

  4. #4overworked2014-01-14 09:46

    sounds like a bad accumulator, your feeling pumps recharge system, have seen similar symptoms in cat skidders .

  5. #5MrElectric032014-01-16 00:14

    I'd lean toward the pump as well. Also there are usually inlet screens in the banjo bolt on the ppc valves, check it and see if there is material blocking flow.

  6. #6Irish in oz2014-10-01 05:36

    Turned out to be the accumalators

  7. #7overworked2014-10-01 07:33

    Thanks for the update. Overworked

  8. #8DJK2014-10-01 18:38

    Did u change all 3 or pull them apart and look for broken bladder?