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 hydraulic tank is low.
Hydraulic fluid foams excessively
causing oil leakage from hydraulic
tank breather.
NOTE: Some aeration of hydraulic
oil on this machine is normal.
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 dragging brakes.
Oil level in hydraulic tank is low or inlet filter is loose or clogged.
Oil is contaminated or oil viscosity is too light.
Oil cooler is damaged or plugged. Oil cooler air flow is obstructed.
Transmission by–pass valve(s) is open or defective.
Gear pump relief valve is stuck open.
Lift control valve is being held in the lift or lower position.
Transmission check valve is not seating or is damaged.
Charge pressure is low.
Transmission or wheel motor(s) is worn or damaged.
(NOTE: If one traction circuit component has internal wear or dam-
age, it is possible that other traction components are also dam-
aged)
Traction response is sluggish.
Transmission by–pass valve(s) is open or defective.
Brake is dragging or binding.
Transmission check valve, relief valve and/or flushing valve is leak-
ing.
Charge pressure is low. Hydraulic oil is very cold.
Transmission or wheel motor(s) is worn or damaged.
(NOTE: If one traction circuit component has internal wear or dam-
age, it is possible that other traction components are also dam-
aged)
Hydraulic System
Page 4 – 20
Groundsmaster 7200/7210
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
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| Document Type | Service Manual |
| Language | English |
| Product Brand | Toro. Customer Service Representatives are available by phone:
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My mower is a TORO 7210.
Start fuse defection. Why ?