Troubleshooting
The chart that follows contains information to assist in
troubleshooting. There may possibly be more than one
cause for a machine malfunction.
Refer to the Testing section of this Chapter for precau-
tions and specific hydraulic test procedures.
Problem
Possible Cause
Fitting(s), hose(s) or tube(s) are loose or damaged.
Hydraulic oil leaks from system.
O--ring(s) or seal(s) are missing or damaged.
Oil level in reservoir is low.
Hydraulic fluid foams.
Hydraulic system has wrong type of oil.
One of the pump suction lines has an air leak.
Incompatible hydraulic oils mixed in system.
Water in hydraulic system.
Hydraulic system operates hot.
Transmission pressure is high due to load or brakes applied.
Oil level in reservoir is low or inlet filter is loose or clogged.
Oil is contaminated or oil viscosity is too light.
Oil cooler is damaged or plugged. By--pass relief is stuck open or
air flow is obstructed.
Hydrostat by--pass valve is open or defective.
Charge pressure is low.
Wheel motor(s) or cutting unit motor(s) are worn or damaged.
Traction pump is worn or damaged.
Neutral is difficult to find or unit oper-
ates in one direction only.
External control linkage is misadjusted, disconnected, binding or
damaged.
Traction pump is worn or damaged.
Traction response is sluggish.
Hydrostat by--pass valve is open or defective.
Brake is not released.
Charge pressure is low. Hydraulic oil is very cold.
Traction pump or wheel motor(s) are worn or damaged.
Brake is not released.
No traction exists in either direction.
Oil level in reservoir is low.
Hydrostat by--pass valve is open.
Traction pump drive belt is loose or broken.
Charge pressure is low.
Traction pump or wheel motor(s) are worn or damaged.
Hydraulic System
Page 4 -- 22
Groundsmaster 3505--D
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