TM 5-3810-306-20
The outlet section has two ports. One port, offset to the side is the return from the circuit supplied by ports A and B. The
other port is for the power beyond circuit as long as the working section spool is in neutral.
Outrigger Control Valve Assembly
The solenoid valve stack assembly consists of four valve sections, four solenoid assemblies, and an assembly kit. By
using the four valves assembled together, four separate components can be controlled by a single hydraulic source.
The valve is held in its normally closed position by a spring. When the solenoid is energized, the plunger assembly forces
the spool to shift which opens the valve. De-energizing the solenoid causes spring pressure to shift the spool to its
normally closed position.
Pilot Operated Check Valve
The pilot operated check valve is located in the port block on the outrigger stabilizer cylinder. The valve is normally closed
and is opened by pilot pressure.
Hoist Motor Control Valve
The hoist motor control valve is designed to provide an even flow of oil to the hoist motors in both directions.
To drive the hoist motor in the raise direction, hydraulic oil flows through the in port and pushes to the free flow poppet off
its seat. The oil then flows to the out port and onto the hoist drive motors.
When driving the hoist motors in the lower direction, oil from the directional control valve enters the out port. The pilot
operated poppet is held shut by the adjustment spring until pilot pressure of sufficient force is secured at the pilot pressure
port to move the pilot operated poppet off its seat. This allows flow to the return reservoir through the directional control
valve.
An orifice plug is installed in the pilot pressure port to restrict back flow when the directional control valve is closed. The
restriction prevents the pilot operated poppet from chattering on it seat.
A vent is provided that vents the area between the pilot piston seal and the free flow poppet and pilot operated poppet
seals to prevent a hydraulic lock should weepage around the seals occur.
Swing Brake Valve
The glide swing brake valve is a proportionate valve. Pressing the brake pedal causes hydraulic oil to be transmitted to
the top of the swing brake where pressure and spring tension proportionately apply the brake. The total force overcomes
the brake release pressure and applies the brake.
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