Toro Sand Pro 3040 Service Manual page 39

General Hydraulic System Problems (continued)
Problem
The hydraulic system operates hot
(exceeds 95° C (203° F).
Sand Pro ® 3040 and 5040
20251SL Rev A
Possible Cause
The hydraulic fluid level in the hydraulic
tank is low.
The hydraulic fluid is contaminated or
the fluid viscosity is too light.
Note: Refer to the traction unit
Operator's Manual for hydraulic fluid
specifications.
The hydraulic fluid cooler is damaged
or plugged.
The fluid cooler air flow is obstructed.
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 traction pump is 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 shuttle valve in the left rear wheel
motor is stuck or damaged.
Page 3–5
Corrective Action
Adjust the hydraulic fluid level.
Replace the hydraulic fluid.
Repair or replace the hydraulic fluid
cooler.
Verify cooling fan operation and remove
debris from in and around the fluid
cooler.
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.
Remove, clean, and inspect the shuttle
valve components; refer to Wheel
Motor Service in the Hydraulic System
chapter of this manual.
Troubleshooting: General Hydraulic System Problems