Toro Outcross 9060 Service Manual page 128

Front Loader Circuit (continued)
Hydraulic System: Hydraulic Flow Diagrams
The machine includes a hydraulic circuit to support the hydraulic demands of
an optional front mounted loader. Gear pump (P3), a 5-position auxiliary load
valve located between the operator and passenger seats, a multi-position
loader control valve located on the operator console, and a series of hydraulic
supply lines with quick disconnect fittings are part of the loader circuit. The
multi-position loader control valve can be moved to the left or right to operate
the loader lift cylinders, and moved forward or rearward to operate the loader
bucket curl cylinders.
Note: The front loader circuit can be expanded to include an additional hydraulic
function by installing an optional selector control valve kit; refer to
Control Valve (SCV) Circuit (optional) (page 5–33)
The gear pump section closest to the piston pump, gear pump section (P3),
supplies fluid to the optional loader circuit. Hydraulic fluid from gear pump
(P3) supplies the loader circuit when there is no hydraulic demand for a rear
mount attachment (the auxiliary load valve is in the NEUTRAL/HOLD or FLOAT
position). Flow passing through the auxiliary load valve enters the loader valve
and is directed as follows based on the loader valve position:
•
When the loader control valve is in the NEUTRAL/HOLD position, flow
bypasses the 2 loader lift supply lines and the 2 loader bucket supply lines. In
this position the hydraulic flow passes through the valve and returns to the
hydraulic tank. Return flow from the loader lift and bucket supply lines is
blocked.
•
When the loader control valve is moved to the rear RAISE position, flow is
directed to lift supply line A. Return flow from lift supply line B is allowed to
return to the hydraulic tank.
•
When the loader control valve is moved to the forward LOWER position, flow
is directed to lift supply line B. Return flow from lift supply line A is allowed to
return to the hydraulic tank.
•
When the loader control valve is moved to the fully forward FLOAT position,
flow bypasses the lift supply lines A and B. Lift supply line flow is allowed to
move in either direction with little to no pressure.
•
When the loader control valve is in the right CURL DOWN position, flow
is directed to bucket supply line A.
•
When the loader control valve is moved to the left CURL UP position, flow
is directed to bucket supply line B.
The hydraulic load for the optional loader circuit is limited to 20,684 kPa (3000
psi) by a relief valve in the auxiliary load valve.
Page 5–32
Selector
for additional information.
Outcross 9060
18234SL Rev B