Troubleshooting
The charts that follow contain 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 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.
Hydraulic system operates hot.
Oil level in reservoir is low, or inlet filter is loose or clogged.
Oil is contaminated or too light.
Parking brake is applied or brakes are incorrectly adjusted.
Hydrostat by--pass valve is open or defective.
Oil cooler (if installed) is damaged or plugged. By--pass relief is
stuck open or air flow is obstructed.
Working load of machine (e.g. use of verticutter) may require use of
oil cooler.
Charge pressure is low (see Charge Pressure Relief Valve (R4)
Pressure Test).
Wheel motor(s) or reel motor(s) are worn or damaged (see Wheel
Motor Efficiency and Reel Motor Case Drain Flow Tests).
Traction pump (P3) is worn or damaged (see Traction Drive Hy-
drostat (P3) Flow Test).
Neutral is difficult to find, or unit op-
erates in one direction only.
External traction control linkage is misadjusted, disconnected, bind-
ing, or damaged.
Traction pump (P3) is worn or damaged (see Traction Drive Hy-
drostat (P3) Flow Test).
Traction response is sluggish.
Hydraulic oil is very cold.
Parking brake is applied or brakes are incorrectly adjusted.
Hydrostat by--pass valve is open or defective.
Charge pressure is low (see Charge Pressure Relief Valve (R4)
Pressure Test).
Traction pump (P3) or wheel motor(s) are worn or damaged (see
Traction Drive Hydrostat (P3) Flow and Wheel Motor Efficiency
Tests).
Hydraulic System (Rev. I)
Page 4 -- 28
Greensmaster 3250--D
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