Toro Groundsmaster 7210, Service Manual

Page: 89 / 342

Traction Circuit Problems (continued)
No traction exists in either direction. • The hydraulic-fluid level in the hydraulic tank is low.
• The transmission bypass valves are open.
• The charge pressure is low.
• The engine flywheel coupling is damaged.
• 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.
The wheel motor does not turn. • The transmission bypass valve(s) is open.
• The transmission or wheel motor 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.
The wheel motor does not hold load in the N
EUTRAL
position.
Note: The machine may not be completely stationary if
parked on an incline without the parking brake engaged.
• The make-up fluid from the charge pump is not available.
• The check valves in the transmission are damaged.
• The valve plate(s) in the transmission is worn or damaged.
• The wheel motor is worn or damaged.
• The cylinder block assembly in the transmission
is worn or damaged.
A single-wheel motor turns while unloaded, but
slows down or stops when the load is applied. • The wheel motor is worn or damaged.
• The transmission components (e.g., piston
pump, relief valve, and check valve) for the
problem wheel motor are 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.
The machine does not track straight.
Note: If the machine does not track straight, look for a
problem with the components that affect the weaker traction
side of the machine.
• The external traction control linkage is incorrectly
adjusted, disconnected, binding, or damaged.
• The transmission bypass valve(s) is open.
• The brake is dragging or binding.
• The transmission-check valve is not seating or damaged.
• The transmission or wheel motor(s) is worn or damaged.
PTO Circuit Problems
Problem Possible Causes
The cutting deck blades do not turn. • An electrical problem exists; refer to Chapter 5:
Electrical System (page 5–1) .
• The engine coolant temperature is high.
• The transmission solenoid valve is stuck.
• The transmission charge pump is damaged
(the traction charge circuit is also affected).
• The transmission pressure valve is damaged.
• There is a problem with the cutting deck;
refer to
Chapter 7: Cutting Deck (page 7–1) .
The cutting deck blade(s) turn too slowly. • The engine speed is too low.
• There is a problem with the cutting deck;
refer to
Chapter 7: Cutting Deck (page 7–1) .
The PTO does not stop when disengaged. • An electrical problem exists; refer to Chapter 5:
Electrical System (page 5–1) .
• The transmission solenoid valve is stuck or damaged.
• The PTO brake friction plates are worn or damaged.
Groundsmaster 7210 Page 4–29 Hydraulic System: Troubleshooting
16222SL Rev C