Troubleshooting — Hydraulic System

Hydraulic System

NOTE: Also see “Work Hydraulics Troubleshooting” on page103 and “Hydraulics Troubleshooting Diagnostic Flow Charts” on page107.

ProblemPossible CauseCorrective Action

Hydraulics do not work or work only at a low performance level

Low hydraulic fluid levelAdd hydraulic fluid

Hydraulic fluid is not warmAllow longer warm-up

Engine to pump coupling or hydraulic pump damaged

Check hydraulic system pressures. Check pump coupler for wear. inspect hydraulic pump for wear; analyze hydraulic oil sample. Repair/replace as necessary

Pressure limiting valves set too low or damaged Check hydraulic system pressures. inspect pressure limiting valve. Repair/replace as necessary

Hydraulic cylinder damagedDisassemble cylinder and inspect for wear/damage parts. Repair/replace as necessary. Replace seals

Control valve damagedInspect control valve. Repair/ replace as necessary. Replace seals.

Engine speed is too lowAdjust engine speed. See “Accelerator pedal” on page51 See “Hand throttle” on page51

Dirty/restricted air filter(s)Replace air filter(s)

Incorrect fuel gradeChange the fuel; see “Fluid Capacities/Lubricants” on page11for proper fuel grade

Attachment tilts down with tilt control in neutral

Oil leaking past tilt cylinder seals (internal or external)

Leaking hydraulic hoses, tubes or fittings between control valve and cylinders

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

Hydraulic oil leaking past cylinder piston seals

Attachment tilt not working; Lift arm works properly

Tilt spool in control valve not actuated or leaking

Remove cylinder. Repair/replace as necessary. Replace seals

Repair as required

Inspect control valve. Repair/ replace as necessary. Replace seals

Remove cylinder. Repair/replace as necessary. Replace seals.

Inspect control valve. Repair/ replace as necessary. Replace seals