Allied H6G, Руководство по обслуживанию

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General
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Directional Control Manifold
The directional control manifold controls the direction
of hydraulic 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 directional control valve, and oil fl ow is delivered to
the motor. The directional control manifold also houses
several other winch control features including the coun-
terbalance 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 pressure 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. See Figure 1-22 for
schematics on page 25.
Logic Control Manifold
The logic control manifold is used to communicate pres-
sure signals that control the
BRAKE-ON , 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 communication between
HI-SPEED and FREESPOOL 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 HI-SPEED and FREESPOOL valves are 3-way
electric over hydraulic valves that communicate pressure
responses to respective functions when activated.
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 two electric rocker switches to
operate
HI-SPEED and FREESPOOL functions. Each
switch is equipped with integral LED indicator to show if the
function is active. The
FREESPOOL switch incorporates
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 set-
ting of the
HI-SPEED limit switch or manually by rocking
the switch back.