Small dirt particles/debris causing the hydraulic valves to stick?

Small dirt particles and debris can cause the hydraulic valves to stick and not function properly. Below are the steps to troubleshoot this problem. The whole process should take around 10 minutes or less.

  1. Disconnect the power connector from one of the valves and press the joystick button (with tractor key in “ON” position if wired to OEM fuse block). You should hear an audible click.
  2. Repeat for the opposite valve. No sound could mean the valve is stuck.
  3. Once the malfunctioning valve is identified, remove the valve from the valve block. 7/8” and 1” wrenches required. You may want to reinstall the solenoid onto the valve and energize while it is out of the valve block to confirm malfunction.
  4. Manually depress the plunger by inserting a fine point sharpie marker (or equivalent) into the end of the valve. Observe the orifice moving from the far groove to the near groove.
  5. Depress the plunger several times. If it is sticking, gritty, or stuck, spray the internal components of the valve with WD40 and/or compressed air to dislodge the debris.
  6. Clean the valve, then lubricate with fresh hydraulic oil.
  7. Reinstall the solenoid onto the valve and energize to confirm functionality.
  8. Reinstall into the valve block and test for functionality. Repeat on the other valve if required.


Manufacturing Facility
70 Hartwell Street
West Boylston, MA 01583
Tel: 508.459.4394 | Fax: 508.854.3377