Toro Outcross 9060 Service Manual page 123

Differential Lock Circuit (continued)
Outcross 9060
18234SL Rev B
The drive axles include hydraulically actuated differential locks. The differential
locks are engaged when the engine is running and the differential lock button is
pressed, or while the engine is running and the parking brake is engaged.
The gear pump section furthest from the piston pump, gear pump section (P4),
supplies fluid to a variety of circuits including the differential lock. Hydraulic
fluid from gear pump (P4) enters the main manifold port P and flows through
the steering priority valve (EC1); refer to
explanation of the steering priority valve (EC1) operation. Fluid flow continues
through the flow regulator valve (EC2) where it dead heads at solenoid valve
(SP1). Fluid is also sent to one end of the flow regulator valve (EC2) spool. As
long as circuit flow is blocked at solenoid valve (SP1), the flow regulator valve
(EC2) spool is shifted to direct flow to the traction charge, 2 speed drive motor
control, brake release, differential lock and PTO clutch circuits.
When the differential lock switch is set to the D
(SV3) in the main manifold is de-energized and hydraulic flow bypasses the
differential lock circuit. Return springs in the differential lock assemblies keep
the differential locks disengaged. When the differential lock switch is held in the
E position, solenoid valve (SV3) energizes and hydraulic flow is directed
NGAGE
to the pistons of the differential lock assemblies. Each piston moves a fork and
collar over a series of pins on the differential assembly to lock the axles together.
Steering Circuit (page 5–18)
ISENGAGE
Page 5–27 Hydraulic System: Hydraulic Flow Diagrams
for a full
position, solenoid valve