Hydraulics — Work Hydraulics Troubleshooting

Lift arm does not raise/lower.Lift spool in control valve not actuated or leaking.

Repair/replace control valve. See “2-Spool Control Valve Removal” on page126 or “3Spool Control Valve Removal” on page128. Also refer to the parts manual for control valve parts information.

Oil leaking past lift arm cylinder piston seals.

See “Work Cylinder Leakage Test” on page124. Repair/ replace cylinder if required. Also see “Hydraulic Cylinder Disassembly/Assembly” on page141.

Refer to flowchart on page107 for more detailed lift arm hydraulics troubleshooting.

Attachment tilt not working properly.Tilt spool in control valve not actuated or leaking.

Repair/replace control valve. See “2-Spool Control Valve Removal” on page126 or “3Spool Control Valve Removal” on page128. Also refer to the parts manual for control valve parts information.

Oil leaking past tilt cylinder piston seals. See “Work Cylinder Leakage Test” on page124. Repair/ replace cylinder if required. Also see “Hydraulic Cylinder Disassembly/Assembly” on page141.

Refer to flowchart on page107 for more detailed attachment tilt hydraulics troubleshooting.

Hydraulic system overheating.Hydraulic oil cooler is dirty.Clean hydraulic oil cooler. Hydraulic oil level is too low.Add hydraulic oil; check for leaks. See “Checking Hydraulic Oil Level” on page29.

Load too high.Reduce the load.

Auxiliary hydraulics control lever not in neutral.

(NOTE: following serial numbers only:

400 Series 41249 and Before

Check that auxiliary hydraulics control lever is in neutral. See page50 for auxiliary hydraulics control lever location.