Troubleshooting - Toro 30821 Service Manual

Troubleshooting

The charts that follow contain information to assist in
troubleshooting. There may possibly be more than one
cause for a machine malfunction.
Problem
Hydraulic oil leaks from system.
Hydraulic fluid foams.
Hydraulic system operates hot.
Neutral is difficult to find, or unit op-
erates in one direction only.
Traction response is sluggish.
No traction exists in either direction.
Hydraulic System (Rev. G)
Refer to the Testing section of this Chapter for precau-
tions and specific test procedures.
Possible Cause
Fitting(s), hose(s), or tube(s) are loose or damaged.
O- ring(s) or seal(s) are missing or damaged.
Oil level in reservoir is low.
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.
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.
External control linkage is misadjusted, disconnected, binding, or
damaged.
Traction pump is worn or damaged.
Hydrostat by- pass valve is open or worn.
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.
Oil level in reservoir is low.
Hydrostat by- pass valve is open.
Traction pump drive belt loose or broken.
Charge pressure is low.
Traction pump or wheel motor(s) are worn or damaged.
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