Rev. 9/10/2020
EHLTP-4864-2-60-D2 MANUAL
Copyright 2020 Vestil Manufacturing Corp. Page 9 of 12
4. Remove the nut holding the solenoid coil (item 2) on the solenoid valve stem. Remove the coil (2); then
unscrew the valve (7) from the manifold.
5. Inspect the valve for contaminants. Inspect the O-rings and back-up washers for cuts, tears, or other damage.
6. With the valve immersed in mineral spirits or kerosene, insert a thin tool such as a small screwdriver or a small
hex wrench in the hole at the bottom of the valve (see illustration below). Push the spool in and out several
times. A properly functioning spool should move freely, with about 1/16” of travel. Use mineral spirits to flush
the valve.
7. If the spool continues to stick, the stem could be bent. If the stem is bent, the valve must be replaced.
8. Blow dry the valve with compressed air while continuing to push the spool in and out.
9. Inspect the bottom of the valve cavity (in the manifold) for contaminants.
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 (see illustration below).
11. Reinstall the solenoid valve. Tighten to 20 ft-lb of torque. Reattach the solenoid coil and the retaining nut.
BLEEDING AIR FROM 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. Unload 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 tables with more than 1 cylinder, it will be necessary to open the bleeder valves on all cylinders
simultaneously in order to bleed the valves.
