Revision 1.0
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7.3
Functional Description of Hydraulics when Operating
The description in the following chapters are relating to Figure 11 “Hydraulic Schematic”. Please use this
drawing to understand the specific functionality of the ILSL lift gate.
7.3.1
Slide Out Function
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As soon as the Motor starts to run, valve S8 is energized.
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Oil pressure on input “A” sets exits “Av” and Bv” at the valve block under pressure.
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The surface at the end of the piston rod on input “B” is larger than on the shaft at input “A”.
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This creates a stronger force at the piston rod (“B”) than at the shaft (“A”).
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This factor forces the cylinder to extend.
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The lift gate will slide out to the end of the rails.
7.3.2
Lower Down
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The shift valve S5 at the pump and the solenoid release valves S1 and S2 at the cylinders will get
energized. In addition the leaking down stop valve S11 in the back of the mount frame is also energized.
•
The gate is designed to lower down by gravity. It will push the hydraulic oil out of the lift cylinder into the
reservoir. The oil passes the solenoid release valves S1 and S2. It also has to pass the energized S11
valve in the back of the mount frame and the shift valve S5 at the pump.
7.3.3
Lift Up Function
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Motor starts running and double locking release valves S1 and S2 are energized.
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The pressure is on input “A” at the valve block. The oil passes the S11 valve and sets pressure on exit
“AH”.
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The energized double locking release valves S1 and S2 forces the fluid to push the lift cylinders to
extend. The platform raises up.
7.3.4
Slide In Function
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Motor starts running and S7 valve is energized.
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Oil pressure on input “A” sets pressure on exits “Av” at the valve block.
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The Oil pressure on exit “Av” at the valve block sets pressure on input “A” at the cylinder.
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The energized valve S7 is allowing the oil at the bottom of the piston rod to get back through the S5 into
the reservoir.
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The pressure on the end of the shaft will force the piston rod to retract.
The liftgate will slide in under the body.