Hyster H90XMS:
Hydraulics. Mast lowering

I'm still waiting for my service manual to show up. I have a H90XMS with a S/N of K005D02125X. The lift cylinders are lowering without touching the controls. I am looking for some help on troubleshooting this or a schematic.
  • Posted 8 Jul 2013 07:35
  • Discussion started by brokendirtbike
  • Washington, United States
Hard working with little time for hard playing
josh dot olivia gmail
Showing items 1 - 4 of 4 results.
If the Lift cylinders retract when the lift spool is in the neutral position here are some suggestions to check for...

- Cylinder seals leak or check valve for lift spool leaks.
- Large leaks between the spool and bore in the main control valve.
- Hydraulic line(s) leak. (if there are no visible leaks then rule this out and look at the first 2 problems)
  • Posted 14 Jul 2013 14:34
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
There regular controls not electronic.
  • Posted 14 Jul 2013 01:56
  • Reply by brokendirtbike
  • Washington, United States
Hard working with little time for hard playing
josh dot olivia gmail
What a easy way to diagnose a problem. Thanks for the help, I'll give it a try.
  • Posted 14 Jul 2013 01:55
  • Reply by brokendirtbike
  • Washington, United States
Hard working with little time for hard playing
josh dot olivia gmail
Does it have electronic mini-levers or regular hand lever? I use a block off system to determine if I have a valve malfunction or cylinder packing. As old as this truck is, I would look closely at cylinder packing being the issue. Start by blocking off the free lift cylinder. I use a ball type valve to install in line, raise cylinder and close ball valve. If it drifts downward, you have found it. If not move the valve to the lift cylinders, if you do not have downward drift, the control valve is leaking by. If you get drift, one or both lift cylinders is leaking internally.
  • Posted 8 Jul 2013 13:18
  • Reply by meliftman
  • Alabama, United States
Liftman
Retired
Elberta, Al.

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