Toro Outcross 9060 Service Manual page 66

Traction System Problems (continued)
Problem
No traction exists in either direction.
High range traction speed will not
engage.
The parking brake cannot be
disengaged with engine running.
Troubleshooting: Traction System Problems
Possible Cause
The hydraulic fluid level in the hydraulic
tank is low (other hydraulic circuit
performance is affected as well).
The traction pump bypass valve(s) is
open or damaged.
One or more orifice or screen in piston
(traction) pump control assembly is
partially obstructed or damaged.
The charge pressure is low (steering
and lift circuit performance is also
affected).
The traction pump charge relief valve is
leaking or damaged.
Problem with the piston (traction) pump
control solenoid circuit exists.
The traction pump relief valves are
leaking or damaged.
The traction pump is worn or damaged.
The drive axle motor 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.
An electrical problem exists in the
solenoid valve (SV1) circuit.
Solenoid valve (SV1) in the main
manifold is leaking or faulty.
An electrical problem exists in the
solenoid valve (SV2) circuit.
Solenoid valve (SV2) in the main
manifold is leaking or faulty.
Page 3–28
Corrective Action
Adjust the hydraulic fluid level.
Close or replace the traction pump
bypass valve(s).
Clean or repair piston (traction) pump
passages.
Verify charge pressure; refer to the
InfoCenter SERVICE–INPUT/OUTPUT
–TRACTION–TRACTION INPUTS
FRONT TRACTION and REAR
TRACTION readings while the machine
is stationary.
Clean or repair the charge relief valve.
Verify traction pedal sensor operation
and the machine wire harness traction
pedal circuit.
Verify the TEC output to the pump
control solenoids are occurring.
Test the machine wire harness pump
control solenoid circuits.
Clean or repair the piston (traction)
pump relief valves.
Verify traction pump operation; refer to
Traction Pump (P1 and P2) Tests in
the Hydraulic System chapter of this
manual.
Repair or replace the drive axle motor.
Test and replace the valve solenoid if
necessary.
Test the machine wire harness solenoid
valve (SV1) circuit.
Clean the solenoid valve and replace
the seals
Replace solenoid valve if necessary.
Test and replace the valve solenoid if
necessary.
Test the machine wire harness solenoid
valve (SV2) circuit.
Clean the solenoid valve and replace
the seals
Replace solenoid valve if necessary.
Outcross 9060
18234SL Rev B