Yale ERC050JAN:
Forward/ reverse problems.

Suddenly I can not get my forklift to go into FOR/ REV Let me back up. If I turn of key (reset PMT) turn back on put in FOR I can get it to go. After a couple of rounds of FOR/ stop /FOR it will no longer go FOR. If I turn off key most times it will go FOR again only to go through the same deal. Once in a rare while it will go into REV. Usually on one time. ie if I go into FOR and then back to REV nothing. Sometimes if reset it tries to go into REV ie. contact moves a little. If I push manually at that point it will engage. usually only one cycle though then contact will not move at all and even pushing contact will not engage.
I have 37.6 V across Battery even though it is 10 years or so old. 2rec and 5 rec were replaced a while ago (3 months) due to an unrelated problem ie the surge/ stall scenario. Main card was replaced a month before that to solve an intermittent problem where it would just stop dead in its tracks problem.
I have 37 V at contacts when switch is on. I have 37 V at FOR/REV switch terminals except one that is 10V.. I've cleaned contacts on FOR/REV contactors. Throttle potentiometer seems to work properly (speed increase smoothly till 1A kicks in). All hydraulics work properly. seat switch / brake switches all work as intended. Handbrake switch is bypassed. Si thats most of what I know. Forklift repair guys now just says its the battery. Don't know as I have 37 V (assume all cells are good then??)
Love any input. Key I think is the sudden nature of the problem. Last week drove all day no problem. Next day nothing
  • Posted 21 Sep 2011 10:09
  • Discussion started by sbaussie
  • California, United States
Showing items 1 - 2 of 2 results.
I did clean all the contacts but did not take it down to the guts. Will check spring etc today. Thanks for the tip
  • Posted 22 Sep 2011 00:46
  • Reply by sbaussie
  • California, United States
Since it acts up going one direction more than the other I would get a real good look at the F and R contactor. Did you pull it right out and check it? I know on that model it is almost impossible to take it apart still mounted in the truck. I just fixed one with that problem and it was the big spring in the contactor. It wouldn't push the contact armiture back enough to make good contact, when not energize, all the time. Once the card "sees" that, it trips the PMT off and you must reset the key.
  • Posted 21 Sep 2011 21:29
  • Reply by mrfixit
  • New York, United States

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