Allied Systems H6H, Service Manual

Page: 18 / 133

Section 1
1 - 9
Operation & Control (See Fig. 1-11)
The H6HT winch is designed to operate on a load sense,
pilot operated hydraulic system. When the tractor is running,
the winch is ready to operate but no oil is flowing to the
winch. Control (pilot) pressure is present at the winch.
The control lever and electrical switches are used to select
the following operations (not all winches are equipped
with all options):
• BRAKE-ON
(spring-centered position)
• LINE-IN
• LINE-OUT
• BRAKE-OFF
(optional)
• FREESPOOL
The tractor must be running and the auxiliary hydraulic
function switch, if equipped, must be on.
LINE-IN
,
LINE-
OUT
and
BRAKE-ON
are controlled by a proportional
control lever.
When the control lever is in the
BRAKE-ON
or centered
position, the holding brake is automatically applied.
Pushing the lever away from the operator releases the
brake, and reels the wire rope off the drum (
LINE-OUT
).
Pulling the lever towards the operator releases the brake,
and reels the wire rope onto the drum (
LINE-IN
). Releasing
the lever causes it to return to the
BRAKE-ON
position,
which stops the drum rotation and applies the holding
brake. Moving the lever a small amount results in slow wire
rope movement for inching control. Line speed increases
proportionally as the lever is moved farther.
The switch panel contains two rocker switches to control
FREESPOOL and BRAKE-OFF . The tractor must be
running to supply hydraulic power to operate these
functions. A light shows when a switch is on.
The FREESPOOL and BRAKE-OFF switches incorporate
a lock to prevent inadvertent actuation. The slide lock
must be released before the switch can be turned on. In
BRAKE-OFF, hydraulic pressure is applied to release the
brake-off clutch. As wire rope is pulled from the winch,
the turning drum back-drives the winch gear train to the
brake-off clutch. The winch motor, brake, and planetary
reducer remain stationary. Mechanical drag through the
gear train and viscous drag in the brake-off clutch keep the
wire rope from bird-nesting as it is spooled off the drum.
CAUTION
Before operating the winch in LINE-IN or
LINE-OUT mode, ensure the FREESPOOL and
BRAKE-OFF lights are not illuminated. The
winch will not operate.
FREESPOOL SWITCH
(YELLOW)
BRAKE-OFF SWITCH
(RED)
WINCH-IN/OUT &
BRAKE-ON DECALS
CONTROL LEVER
MODE OF OPERATION DECAL
Figure 1-11 Winch Controls (K49 Shown)
WARNING
BRAKE-OFF should not be used to lower
a suspended load or a load that can slide
down a slope.