Yale ERP16VT:
forklift Jerking poblem

please help me to find a solution for this problem,
every day in the morning when the operator starts the forklift and starts to accelerate the forklift by pressing the pedal , the forklift starts to jerks in both directions( forward & reverse) and this continues for around 45 minutes and after that the forklift moves in a normal,smooth operation for the rest of the day. moreover there is no error on the display which may indecaites for any fault inside the forklift.
next day, same problem happens with the same steps as descriped above.

we have made some checks for the battery connections ,replaced the traction motor sensors,replaced the accelerator pedal sensor and cleaned all the electrical sockets.

please help me with this problem and try to think if the problem may be caused due to a mechanical problem or no ?
  • Posted 22 Oct 2010 23:29
  • Discussion started by ahmed_a
  • riyadh, Saudi Arabia
Showing items 1 - 4 of 4 results.
i already checked all wires and controllers and last thing i did is replacing the bake oil sensor as i got a doubt that it may be faulty and finally the problem is solved after replacing this sensor.
thank you all.
  • Posted 25 Nov 2010 19:32
  • Reply by ahmed_a
  • riyadh, Saudi Arabia
i already encountered this problem with our toyota electric forklift.check all the wires from the controller to motor checked all the continuity....last thing that solve this problem is by replacing the traction controller i am not familiar in this unit but maybe this hint will help you..

Good luck!
  • Posted 16 Nov 2010 00:42
  • Reply by forkliftcity
  • cebu, Philippines
don't bite the hands that feed you!
Thank you for your response, i already replaced the two traction motors and still jerking , also i replaced the power cables from the battery to the main controlers to make sure that the current is not intruptted at any point but all invain and i'm still getting the same problem.
there is one more thing i'm going to check which is the brake oil sensor which may be faulty and giving a false signal to the traction motors. i will update you incase it solved the problem or no.
  • Posted 5 Nov 2010 21:03
  • Reply by ahmed_a
  • riyadh, Saudi Arabia
Ahmed A,
I know tthis sounds verty much like a mechanical problem, but I think it would be worth while checking the motor field windings for earth faults it could be that the motor is only running on two phases if that checks out ok the may you can run some inductance test on the phase outputs it may be that you have a power unit fault that appears to disapear as the truck system gets warmed up. also there is a bearing at the end of the motor that the power unit sences direction of rotation on but at the moment I cant think of its name but it may have become faulty. I think these areas need checking out.

  • Posted 30 Oct 2010 19:44
  • Reply by Titus
  • North Yorkshire, United Kingdom

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