Hydraulics — Hydrostatic Drive System Hydrostatic Drive System Problem
Possible Cause
Corrective Action
No response from either hydrostatic drive or the lift/tilt systems.
Hydraulic oil viscosity too heavy.
Allow longer warm-up; replace with proper grade hydraulic oil, see “Fluid Capacities / Lubricants” on page 11 for proper oil grade.
Refer to flowchart on page 109 for more detailed hydrostatic drive system troubleshooting. Drive will not operate in either direction.
Parking brake is engaged
Disengage parking brake.
Hydraulic oil level is too low.
Add hydraulic oil; check for leaks. See “Checking Hydraulic Oil Level” on page 29.
Brake/inch pedal stuck or malfunctioning.
Repair/replace as required.
Refer to flowchart on page 109 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 page 11 for proper oil grade.
Hydraulic oil level is too low.
Add hydraulic oil; check for leaks. See “Checking Hydraulic Oil Level” on page 29.
Refer to flowchart on page 109 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 page 29.
Refer to flowchart on page 109 for more detailed hydrostatic drive system troubleshooting. Hydrostatic drive overheating.
50940008/AP0311
Hydraulic oil level is too low.
Add hydraulic oil; check for leaks. See “Checking Hydraulic Oil Level” on page 29.
Drive system continuously overloaded.
Decrease load on drive system.
Lift/tilt and/or auxiliary system continuously overloaded.
Decrease load on lift/tilt and/or auxiliary system(s).
Oil cooler fins restricted.
Clean oil cooler fins.
Hydraulic oil filter restricted.
Replace filter.
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