Allied H6G, Service Manual

Page: 14 / 112

General
1 - 6
Gear Train (See Fig. 1-7 & 1-8)
The tractor pump drives the hydraulic motor with hydraulic
oil supply. Pressure in the hydraulic motor is load induced
through the winch gear train. The motor shaft rotates to
give
LINE-IN or LINE-OUT with supply oil and return oil
is directed back to the tractor reservoir. The motor is at-
tached to a multi-disc spring applied brake that holds the
winch drum in a fi xed position when no power operation
occurs. If oil is supplied to the hydraulic motor, the brake
is simultaneously released with pilot control pressure.
When oil is not supplied to the motor, a spring applies
the brake.
The hydraulic motor can operate at half displacement
when the operator selects the
HI-SPEED switch. At half
displacement the gear train rotates at roughly twice the
speed.
A planetary gear assembly gives a 1:6 gear reduction
between the hydraulic motor and the planetary output
gear. Motor shaft direction of rotation is the same as the
planetary output gear at 1/6th the speed.
An intermediate gear assembly gives further gear re-
duction to increase torque at the winch drum. A dental
clutch with splines engages the drum pinion gear and the
intermediate gear. The operator can disengage the dental
clutch with an electric switch to engage the
FREESPOOL
feature.
Figure 1-8 Rotation Torque Transfer
BRAKE-ON
Oil Supply
Oil Return Oil Supply
Oil Return
LINE-IN LINE-OUT
Durm Gear
Intermediate Gear
with Freespool
Drum Pinion Gear
Planetary Reducer
Brake
Hydraulic Motor
A drum gear engages the drum pinion gear and is con-
nected to the drum. When power is applied to the gear
train, the drum will rotate in the forward or reverse direc-
tion. The drum adapter connects the drum to the drum
gear. The other side of the drum runs on roller bearings
held by the drum shaft. The drum shaft is connected to
the winch case.
Figure 1-7 Gear Train