Toro Groundsmaster 7210, Service Manual

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Troubleshooting
The following chart contains information to troubleshoot hydraulic circuit
problems. There can be more than 1 cause for a machine malfunction.
Refer to Testing the Hydraulic System (page 4–31) for precautions and specific
hydraulic test procedures.
General Hydraulic System Problems
Problem Possible Causes
The hydraulic fluid is leaking from the system. • The fitting(s), hose(s), or tube(s) are loose or damaged.
• The O-ring(s) or seal(s) are missing or damaged.
The hydraulic fluid foams excessively causing
fluid leakage from the hydraulic tank breather.
Note: Some aeration of the hydraulic fluid on this machine
is normal.
• The hydraulic-fluid level in the hydraulic tank is low.
• The hydraulic system has a wrong type of fluid.
• One of the pump suction lines has an air leak.
• The incompatible hydraulic fluids are mixed in the system.
• There is water in the hydraulic system.
The hydraulic system operates hot. • The transmission pressure is high due to load
or dragging brakes.
• The hydraulic-fluid level in the hydraulic tank
is low or the inlet filter is loose or clogged.
• The hydraulic fluid is contaminated or the fluid
viscosity is too light.
• The oil cooler is damaged or plugged. The oil
cooler air flow is obstructed.
• The transmission bypass valve(s) is open or damaged.
• The gear pump relief valve is stuck open.
• The transmission check valve is not seating or is damaged.
• The charge pressure is low.
• The transmission or wheel motor(s) is worn or damaged.
Note: If 1 traction circuit component has internal wear or
damage, it is possible that the other traction components
are also damaged.
Traction Circuit Problems
Problem Possible Causes
The traction response is sluggish. • The transmission bypass valve(s) is open or damaged.
• The brake is dragging or binding.
• The transmission-check valve, relief valve, and/or
flushing valve is leaking.
• The charge pressure is low. The hydraulic fluid is very cold.
• The transmission or wheel motor(s) is worn or damaged.
Note: If 1 traction circuit component has internal wear or
damage, it is possible that the other traction components
are also damaged.
Neutral is difficult to find.
• The external control linkage is incorrectly
adjusted, disconnected, binding, or damaged.
• The orifice in the transmission-check valve(s) is plugged.
• The transmission is worn or damaged.
Hydraulic System: Troubleshooting Page 4–28 Groundsmaster 7210
16222SL Rev C