Motion Cut Solenoid Valve Installation; Operating Principle - Motion Cut Valve - GKD 1H Series Installation Manual

7 MOTION CUT SOLENOID VALVE INSTALLATION

If motion cut on height limit is required, a three port solenoid valve should be installed in the
low pressure Pilot hydraulic line between the machine control lever and the high pressure
valve block.
Identify the pilot line controlling the boom lift hydraulic function.
With the boom fully lowered and the engine off, remove the pilot line hydraulic fitting from
the valve block, and route it through the three port solenoid valve as per the diagram below.
From Control Lever
Pressure Dump to Tank
From Control Lever
Pressure Dump to Tank
7.1 Operating Principle – motion cut valve
When working below the set height limit, boom up motion is allowed and the solenoid valve
will be powered. Hydraulic oil can flow freely between the machine control lever and the
high pressure valve block. The tank dump line from the solenoid valve is blocked in this valve
state.
When the height limit is reached, the power supply from the Series 1-H display to the
solenoid valve is cut and the valve closes. The pilot line from the machine control lever is
now blocked, and the pilot line to the high pressure valve block is connected to the tank
dump port within the solenoid valve to allow any residual pressure in the pilot line to be
dumped to tank, thus preventing further upward motion and causing immediate motion
cut. When the boom is dropped back below the height limit, power to the solenoid valve is
restored and normal operation is resumed automatically.
www.gkdtechnologies.com
Solenoid Energized (Motion Allowed)
Solenoid NOT Energized (Motion Cut)
10
To Main Valve Block
To Main Valve Block
M1000005 V1.5 - 11/2021