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.
The pump suction line 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 incorrectly adjusted.
Hydrostat by--pass valve is open or defective.
Working load of machine may require use of oil cooler.
Oil cooler (if installed) is damaged or plugged. By--pass relief is
stuck open or air flow is obstructed.
Charge pressure is low.
Wheel motor(s) or reel motor(s) are worn or damaged.
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 control linkage is misadjusted, disconnected, binding, 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 incorrectly adjusted.
Hydrostat by--pass valve is open or defective.
Charge pressure is low.
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. E)
Page 4 -- 24
Greensmaster 3150
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