Allied H12E, Service Manual

Page: 14 / 121

General
1 - 6
Gear Train (See Fig. 1-8)
A tractor mounted pump provides hydraulic fl ow to drive
the winch motor. The fl ow is controlled in the winch by
the hydraulic counterbalance relief manifold and a control
manifold. The motor is mounted to a multi-disc, spring
applied holding brake. The brake is applied when the motor
comes to a complete stop and is used to prevent drum
rotation due to internal hydraulic leakage to the motor.
A planetary gear assembly provides a 18.8:1 gear
reduction between the hydraulic motor and the planetary
output gear. The planetary output gear rotates at the same
direction as the hydraulic motor.
An intermediate gear shaft assembly gives further gear
reduction to increase torque at the winch drum.
Figure 1-8 Rotation Torque Transfer
Figure 1-7 Gear Train
DRUM GEAR
INTERMEDIATE GEAR
DRUM PINION GEAR
BRAKE-OFF CLUTCH
PLANETARY REDUCER
HOLDING BRAKE
HYDRAULIC MOTOR
DUCER
HYDRAULIC
T U O - E N I L N I - E N I L N O - E K A R B
Oil Supply
Oil Return
Oil Supply
Oil Return