Yale ERP9060VLE80TE08:
Lift pump running when accelerator depressed

Good morning all. I'm new to this site. Hoping for some help with my Yale trucks.
I have some Yale model ERP9060VLE80TE08 80 volt battery powered trucks.
There is a problem that seems very strange. When you turn on key and press gas pedal the lift pump starts running and does not stop until you turn off. Of course this overheats the pump drive and starts overheating the hyd. fluid. You can even feel the heat in the steering column where the line run for the steering.
These trucks are difficult to troubleshoot and the mechanics my dealer sends over don't even know how to troubleshoot them. I would appreciate any help pointing me in the right direction on this.
  • Posted 13 Sep 2021 20:35
  • Discussion started by Rick_Palmer
  • North Carolina, United States
Rick Palmer
Showing items 1 - 2 of 2 results.
Thanks for commenting. These trucks do not have a separate pump.
When I said that steering hoses were hot i did not mean overheating just that you could feel the heat through the steering column where the lines run.
Looking more into how this system works I think that it must be a failed pressure switch. Now i just have to find it. I will keep you informed of any progress.
Thanks Again
  • Posted 14 Sep 2021 22:43
  • Reply by Rick_Palmer
  • North Carolina, United States
Rick Palmer
do these units have a separate steering pump?
reason i ask is some newer machines utilize the hydraulic pump/system to run steering now. The hydraulic pump will jog at a slow pace and divert fluid to the steering through the steering proportional valve. That would explain why the steeering column is getting hot. If your having overheating issues the dash should set off an alert/fault notifying you/them of it. If it's not triggering an overtemp fault then the machine is running in allowable parameters. I wonder if the tech's have tested the temp and pressure sensors or checked the pressures and/or settings in the system that control the pump 'on/off' time.
I saw this "new way" of powering the steering in some of the earlier hyster trucks back when the AC powered motors, controls started becoming a thing.
These new systems trigger the power steering multiple ways, interaction with the foot pedal when in gear, movement of the steering wheel via a haleffect pot in the steering column combined with a pressure sensor inline with the steering pressure line. (older systems used the pressure sensor at the steering pump).
If this unit does not have the integrated steering in the hydraulic circuit and does have it's own motor then i would be looking for some other electrical issue causing it to trigger the hyd pump when it's not supposed to, a hung switch or bad sensor/switch in the controls.
As far as the dealer tech's? and knowing how to troubleshoot them? First off they shouldn't be sending out a tech that is not trained on the model lift you have. If they are not certified on that model the engineering at Yale will not deal with them.
All dealer tech's have a hotline to the mfg so if they have problems diagnosing any issues they should be contacting engineering at Yale for help.
Communication between you and your tech is imperative and if he's not doing that well enough for you then request another tech till they send someone that knows what they are doing. A good tech will tell you everything that is going on, work with the mfg, and won't leave you hanging and will always follow up and resolve the issue in a timely manner. (please do complain to the dealer about the poor service and that should get them off their butts, if it doesn't then find another dealer).
  • Posted 13 Sep 2021 23:31
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!

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