ILU 40/50 Owner
’s Manual
Revision 1.5
31
6.3
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 ILU lift gate.
6.3.1
Slide Out Function
As soon as the Motor starts to run, valve S8 is energized.
Oil pressure on input “A” sets exits “Av” and Bv” at the valve block under pressure.
The surface at the end of the
piston rod on input “B” is larger than on the shaft at input “A”.
This creates a stronge
r force at the piston rod (“B”) than at the shaft (“A”).
This factor forces the cylinder to extend.
The lift gate will slide out to the end of the rails.
6.3.2
Lower Down and Auto Tilt Function
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.
When the platform touches the ground the auto tilt function will get activated (B-13).
Solenoid release valves S3 and S4 at the tilt cylinders will be activated.
The existing oil in the tilt cylinder runs back through the energized solenoid release valves S3 and S4
and the energized shift valve S5.
Speed of tilting down will be reduced by passing through the restrictor R5.
6.3.3
Level Out Activity
Motor starts running and S5 valve is energized.
Oil pressure on input “B” sets pressure on exits “BK” at the valve block.
The Oil pressure on exit “BK” at the valve block sets the input “B” at the tilt cylinder on pressure.
The platform will tilt up and get in a level position. When the platform is leveled, the B-15 Platform sensor
shuts down the shift valve S5 and activates the S1 and S2 valves at the Lift Cylinders which directs the
fluid into the Lift Cylinders. This causes the platform to raise.
