Allied H12E, Service Manual

Page: 25 / 121

Section 1
1 - 17
Sequence of Operation - LINE-IN, Option Code B
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 and to the
motor “A” port. At the same time, control pressure from
the control lever applies pressure to the RI port, through
the shuttle valve, to the brake valve. At the set pressure,
the brake valve directs pilot fl ow to release the brake.
Pilot pressure at motor X1 port is proportional to control
lever position. When the pressure at X1 reaches a preset
level, the motor servo reduces motor displacement
to increase line speed. If working pressure increases
to PCOR setting, the motor servo begins to increase
displacement to increase line pull.