Allied H12E, Service Manual

Page: 21 / 121

Section 1
1 - 13
Figure 1-16 Control Manifold
Control Manifold (See Fig. 1-16)
The control manifold contains the brake valve, two
solenoid valves and a shuttle valve to direct pilot pressure
to release the
BRAKE , the BRAKE-OFF CLUTCH and
control hydraulic motor displacement. The shuttle is
used to send pressure from either
LINE-IN or LINE-OUT
to the brake valve. When control pressure rises to the
brake release pressure setting, the brake valve sends
pilot pressure to release the brake. One solenoid valve is
used to send pilot pressure to release the
BRAKE-OFF
CLUTCH . The solenoid receives an electrical signal from
a switch on the operator console. The second solenoid
is used on Option Code “D” winches to command high
speed operation.
Port FS
Brake Valve
Port RO
Port Brake
Port PD
Port PP
Port BO
Port TP-BRAKE
Port X1
Port RI
Solenoid Valves