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Clark gps25mb transmission

Discussion in 'Forklifts/Telehandlers' started by posrepair2013, Apr 24, 2020.

  1. posrepair2013

    posrepair2013 Active Member

    Joined:
    Nov 23, 2013
    Messages:
    41
    Location:
    new york
    Hi everyone
    I have a Clark GPS 25mb forklift when u start machine you have to let it run for about 3-4 min before transmission will work.
    Once the transmission works it works perfectly fine and according to last owner has been like that for the 10 years he had it .
    Anyone ever see this problem?
     
  2. tractormech

    tractormech Well-Known Member

    Joined:
    Feb 19, 2015
    Messages:
    169
    Location:
    florida
    Sounds like it has wear in the clutch packs and front pump. Once it warms a bit and the oil thins and the heat tightens clearances up off it goes. No one can say for sure but it may run another ten years just like that. If it has a inching valve on the transmission be sure it's moving freely and not dumping converter pressure and maybe check the suction screen if it's accessible and change the filter.. other than that run it.
     
  3. tractormech

    tractormech Well-Known Member

    Joined:
    Feb 19, 2015
    Messages:
    169
    Location:
    florida
    The only other thing is be sure the oil is the correct viscosity-but someone may have put a heavier oil in it because it was showing signs of wear-just a theory.
     
  4. tractormech

    tractormech Well-Known Member

    Joined:
    Feb 19, 2015
    Messages:
    169
    Location:
    florida
    Just don't do anything drastic -if the transmission is supposed to have ATF and someone has tractor hydraulic fluid in it it's thicker and could cause it to be slow at first. If you switch it back to ATF it could fail-if it has fiber clutches the lining will come off and you're done. I've seen it happen.
     
  5. posrepair2013

    posrepair2013 Active Member

    Joined:
    Nov 23, 2013
    Messages:
    41
    Location:
    new york
    Thanks for the advice
    I am going to start with filters they look like someone forgot about them for a very long time.
     
  6. tractormech

    tractormech Well-Known Member

    Joined:
    Feb 19, 2015
    Messages:
    169
    Location:
    florida
    They do get neglected. She sounds like she's showing her age but for occasional use she'll probably get you by for a long while.