Toro Sand Pro 3040 Service Manual page 41

Traction System Problems (continued)
Problem
No traction exists in either direction.
The vehicle moves when stopped on a
gentle slope (wheel motors will not hold
load) in neutral.
The front wheel slips or spins (rear
wheel traction is reduced).
Sand Pro ® 3040 and 5040
20251SL Rev A
Possible Cause
The parking brake is engaged.
The hydraulic fluid level in the hydraulic
tank is low (other hydraulic circuit
performance is affected as well).
The traction control linkage is
incorrectly adjusted, binding, or
damaged.
The traction pump bypass valve is open
or damaged.
The charge pressure is low (lift
circuit performance, and steering
circuit performance for model 07845
machines is also affected).
The piston (traction) pump or pump
relief valves are worn or damaged.
The wheel motor(s) is worn or
damaged.
Note: If a traction circuit component
has internal wear or damage, it
is possible that the other traction
components are also damaged.
The charge pressure is low (lift
circuit performance, and steering
circuit performance for model 07845
machines is also affected).
The piston (traction) pump or pump
relief valves are worn or damaged.
Relief valve RV is stuck or damaged.
Page 3–7
Corrective Action
Disengage the parking brake.
Adjust the hydraulic fluid level.
Inspect traction linkage operation and
service or adjust if necessary.
Close or replace the traction pump
bypass valve.
Verify charge pressure; refer to Testing
the Traction Circuit – Charge Pressure
in the Hydraulic System chapter of this
manual.
Verify traction pump operation; refer
to Testing the Traction Circuit – Piston
(traction) Pump (P1) Flow and Relief
Pressure Test in the Hydraulic System
chapter of this manual.
Verify wheel motor operation; refer to
Testing the Traction Circuit – Wheel
Motor Efficiency in the Hydraulic
System chapter of this manual.
Verify charge pressure; refer to Testing
the Traction Circuit – Charge Pressure
in the Hydraulic System chapter of this
manual.
Verify traction pump operation; refer
to Testing the Traction Circuit – Piston
(traction) Pump (P1) Flow and Relief
Pressure Test in the Hydraulic System
chapter of this manual.
Disassemble, clean, inspect and repair
or replace the relief valve.
Troubleshooting: Traction System Problems