Hyster S50XL:
Reverse locking up

When putting truck in reverse the wheels lock
Pressure at reverse and forward test ports reading 100 psi each
No brake work was done to suggest them locking up
Acts as if the drive gearbox goes into park
Will studder in reverse if rev engine but not move to far
Checked inching brake and is set correctly
Truck moves slightly forward in neutral position
Removed and replaced gasket on valve body for shift spools
Am at a loss for what to check next
Does anybody have an idea?
  • Posted 27 Jun 2018 02:46
  • Discussion started by lenC
  • Texas, United States
I'm here for the beer
Showing items 1 - 5 of 5 results.
In neutral, does it speed up going forward when you rev the motor. I have seen the forward clutch break a disc and jam up locking it so it is always in forward. Then when you put it in reverse the 2 clutches are fighting themselves and won't go anywhere.
  • Posted 27 Jun 2018 07:57
  • Reply by mrfixit
  • New York, United States
thought about that but wondered why the truck was creeping forward in neutral. Seems like i have a spool leaking past?
I am not familiar with how the clutches engage, is it like a motorcycles master cylinder that has a hydraulic cylinder that physically moves the clutch pressure plate?
by the way thanks for the prompt reply, i appreciate the help
  • Posted 27 Jun 2018 07:02
  • Reply by lenC
  • Texas, United States
I'm here for the beer
If your pressures are good then it sounds like there is a mechanical problem in the transmission gears.
  • Posted 27 Jun 2018 06:24
  • Reply by BREWSKI
  • Nebraska, United States
Hey Brewski
No I have zero pressure on forward when reversed is engaged and zero pressure on reverse when forward is engaged
Also the modulator pressure is 100 and drops the normal amount of time before increasing when shifting
Checked for brake drag with engine not running and they were free turning
Hope this helps
  • Posted 27 Jun 2018 05:29
  • Reply by lenC
  • Texas, United States
I'm here for the beer
If I understand correctly by your description, you have 100 PSI on both packs when in reverse? What do you have when in forward? Does the truck move in forward?
  • Posted 27 Jun 2018 04:44
  • Modified 27 Jun 2018 04:45 by poster
  • Reply by BREWSKI
  • Nebraska, United States

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