Allied H12E, Service Manual

Page: 43 / 121

Section 1
1 - 35
Sequence of Operation - LINE-IN HI-SPEED (K64)
Pulling the control lever toward the operator commands
the tractor ripper valve to send oil fl owing to the winch,
through the counterbalance relief manifold to the motor “A”
port and to the RI port on the control manifold. The brake
valve directs pilot fl ow to release the brake.
If the operator selects HI-SPEED mode by the rocker
switch on the control panel, an electric solenoid valve on
the control manifold sends pilot pressure to the X1 port on
the motor. Pressure commands the servo to reduce motor
displacement to increase line speed. If working pressure
increases to PCOR setting, the motor servo begins to
increase displacement to increase line pull.