Allied Systems Allied H6G Series, Руководство по обслуживанию

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General
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Direction Control Manifold (High-Performance Winch
Only)
The direction control manifold controls the direction of hy-
draulic fl ow to the winch motor. When the operator moves
the control lever into the
LINE-IN or LINE-OUT position,
a pressure response is signaled to one side of the direc-
tion control valve, and oil fl ow is delivered to the motor.
The direction control manifold also houses several other
winch control features including the counterbalance valve,
load sense relief valve, and load sense check valves. The
counterbalance valve is a load holding valve that blocks
return oil fl ow from the motor in the event supply pressure
drops below a set point in
LINE-OUT mode. This valve
also acts as an overload relief valve when supply pres-
sure exceeds the setting of the valve. The counterbalance
valve allows oil to free fl ow in the
LINE-IN mode through
a check valve. The load-sense relief valve limits the winch
load signal to the tractor pump to limit the winch hydraulic
system pressure. The load sense check valves are used
to communicate winch motor pressure to the pump load
sense controller. Another check valve in the load sense
circuit is used to intensify the DV or
BRAKE-OFF control
signal. See Figures 1-26 and 1-27 for schematics on
pages 31 and 32.
Logic Control Manifold (High-Performance Winches
Only)
The logic control manifold is used to communicate pres-
sure signals that control the
BRAKE-ON , BRAKE-OFF,
HI-SPEED , and FREESPOOL . The manifold contains
a series of shuttle valves, a directional valve, and three
solenoid valves. One shuttle is used to send a pressure
response to the brake when the winch is shifted to
LINE-IN
or LINE-OUT . The two other shuttle valves allow com-
munication between BRAKE-OFF, HI-SPEED , and FREE-
SPOOL functions. The brake valve provides pressure to
the brake when the LINE-IN or LINE-OUT control pressure
exceeds the pilot setting of the valve. The BRAKE-OFF, HI-
SPEED , and FREESPOOL valves are 2-way electric over
hydraulic valves that communicate pressure responses to
respective functions when activated.
BRAKE-OFF Manifold
The BRAKE-OFF manifold contains a directional valve
that allows the motor to operate as a pump and circulate
oil through an alternate circuit. An orifi ce in the manifold
limits the motor rpm and therefore tractor ground speed
in the
BRAKE-OFF function.
HI-SPEED Limit Switch
The HI-SPEED limit mechanism is comprised of a pres-
sure switch and electric relay. When the HI-SPEED func-
tion is activated, the solenoid valve in the Logic Control
Manifold directs oil to the motor speed spool in the motor.
If the system pressure exceeds a certain percentage of
the rated load, the pressure switch sends a signal to the
relay, which then opens and deactivates
HI-SPEED . The
motor speed will not reactivate until you re-initialize the
switch.
Electronic Control Panel
Depending on the options on the winch, the electronic
control panel contains up to two electric rocker switches
to operate
HI-SPEED , and FREESPOOL functions. Each
switch is equipped with an integral LED indicator to show
if the function is active. The
FREESPOOL switch incorpo-
rates a lock to prevent the switch from being accidentally
turned on. To operate, slide the locking tab fi rst, then push
the rocker switch. The
HI-SPEED switch is a three position
switch on momentary rocker. High speed is deactivated by
pulling a load that generates pressure beyond the setting
of the
HI-SPEED limit switch or manually by rocking the
switch back.