Hydraulics — Hydrostatic Drive System

Hydrostatic Drive System

ProblemPossible

No response from either hydrostatic drive or the lift/tilt systems.

CauseCorrective Action

Hydraulic oil viscosity too heavy.Allow longer warm-up; replace with proper grade hydraulic oil, see “Fluid Capacities / Lubricants” on page11 for proper oil grade.

Refer to flowchart on page109 for more detailed hydrostatic drive system troubleshooting.

Drive will not operate in either direction. Parking brake is engagedDisengage parking brake.

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

Brake/inch pedal stuck or malfunctioning. Repair/replace as required.

Refer to flowchart on page109 for more detailed hydrostatic drive system troubleshooting.

Hydrostatic (drive) system noisy.Hydraulic oil viscosity too heavy.Allow longer warm-up, See “Fluid Capacities / Lubricants” on page11 for proper oil grade.

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

Refer to flowchart on page109 for more detailed hydrostatic drive system troubleshooting.

Sluggish acceleration.Hydraulic oil level is too low.Add hydraulic oil; check for leaks. See “Checking Hydraulic Oil Level” on page29.

Refer to flowchart on page109 for more detailed hydrostatic drive system troubleshooting.

Hydrostatic drive overheating.Hydraulic oil level is too low.Add hydraulic oil; check for leaks. See “Checking Hydraulic Oil Level” on page29.

Drive system continuously overloaded.

Lift/tilt and/or auxiliary system continuously overloaded.

Decrease load on drive system.

Decrease load on lift/tilt and/or auxiliary system(s).

Oil cooler fins restricted.Clean oil cooler fins.

Hydraulic oil filter restricted.Replace filter.