General Hydraulic System Problems - Toro Groundsmaster 5900 Series Service Manual

General Hydraulic System Problems

Groundsmaster ® 5900 & 5910
16227SL Rev B
The charts that follow contain suggestions that can be used to assist in
diagnosing hydraulic system performance issues. The suggestions are not
all−inclusive. Also, consider that there may be more than one cause for a
machine problem.
Review the hydraulic schematic and information on hydraulic system operation
in the Hydraulic Flow Diagrams section of this Chapter. This information will be
useful during the hydraulic troubleshooting process.
Refer to the Testing (page 5–36)
procedures.
Problem
Hydraulic oil leaks from machine.
Hydraulic system operates hot.
Note: Use InfoCenter Display to determine
hydraulic oil temperature.
Hydraulic oil in reservoir foams.
for precautions and specific hydraulic test
Possible Cause
Fitting(s), hose(s) or tube(s) is (are) loose or
damaged.
O−ring(s) or seal(s) is (are) missing or
damaged.
Engine RPM is too low.
Brakes are applied or sticking.
Hydraulic reservoir oil level is low.
Hydraulic oil is contaminated or the wrong type.
Piston pump by-pass valve is open or
damaged.
Cooling system is not operating properly.
Charge pressure is low.
Traction circuit pressure is incorrect.
Pump(s) or motor(s) are damaged.
Hydraulic reservoir oil level is low.
Wrong type of oil is in the hydraulic system.
Air is leaking into a pump suction line.
Page 3–3 Troubleshooting: