Operator’s Manual
2/2/21
EHLT, MANUAL.DOCX
Copyright 2020, Vestil Manufacturing Corp.
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10.
Make sure both O-rings and outer seal (flat) are seated on the valve body. Make sure the screen filter is in
place and seated at the bottom of the threads on the valve body (illustration).
11.
Reinstall the solenoid valve, tightening to 20 ft-lb of torque. Reattach the solenoid coil and the retaining nut.
Bleeding the hydraulic cylinder.
Air can enter the hydraulic system at any time its components are opened for service. Symptoms of air in the system
include erratic or bouncing motion of the platform, sponginess in holding position, unusual noises, or foaming in the
hydraulic fluid. Trapped air can also trigger the cylinder’s velocity fuse, slowing or preventing the cylinder from lowering.
Cycling the platform up and down without a load can expel much of the trapped air through the hydraulic reservoir.
If it becomes necessary to bleed air from the system:
1.
Remove any load from the platform.
2.
Raise the platform. Lower the maintenance props into the side frame. Lower the platform until the props
are about ½”-1” away from the end of the frame. Some motion is necessary to expel air from the system.
3.
Hold a rag over the cylinder’s bleeder valve to capture expelled oil. The valve is located at the top of the
cylinder (see illustration). Use a ¼” wrench to open the valve about a half-turn.
4.
Oil and air will sputter from the valve. Once no more air comes out, close the valve.
5.
For multi-cylinder lift tables, it will be necessary to open the bleeder valves on all cylinders simultaneously in
order to bleed the valves.
