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5. Piston retracts slowly
when loaded.
6. Piston retracts rapidly.
7. Piston extends but does
not maintain extension
and slowly retracts on its
own.
8. Piston extends but does
not retract.
9. Erratic operation
Table of Contents
Rev. 11/27/2018
x. Filter of lowering solenoid valve
clogged;
y. Pinched hydraulic hose;
z. Debris in flow control valve;
aa. Binding cylinder(s);
bb. Debris in velocity fuse.
cc. Leaking hoses and/or fittings;
dd. Check valve stuck open;
ee. Debris in flow control valve.
gg. Lowering solenoid valve incorrectly
wired or stuck open by debris in
valve;
hh. Check valve stuck open;
ii.
Leaking hoses or fittings;
jj.
Cylinder packing worn or damaged.
kk. Lowering solenoid wired incorrectly;
ll.
Lowering solenoid valve stuck
open;
mm. Faulty lowering solenoid coil;
nn. Object in frame blocking leg rollers;
oo. Binding cylinders;
pp. Velocity fuse is open.
qq. Insufficient power
Copyright 2018 Vestil Manufacturing Co.
MPU-AC GEN2, MANUAL
system" on
p.
19.
y. Remove lowering solenoid and clean
filter.
z. Repair hose.
aa. Remove and clean flow control
valve.
bb. Align cylinder(s) properly.
cc. Remove and clean fuse.
dd. Repair as appropriate.
ee. Remove and clean check valve.
ff.
Remove flow control valve from
manifold and clean.
ff.
See remedy k.
gg. Remove and clean check valve.
hh. Repair as appropriate.
ii.
Replacing packing.
jj.
Correct wiring. Contact Technical
Support.
kk. Lightly tap the solenoid coil body to
seat it properly. Striking the coil
hard might damage the stem. DO
NOT remove the solenoid from the
manifold because the tabletop will
descend dangerously quickly.
ll.
Refer to electrical system diagram.
Contact Technical Support.
mm. Raise tabletop a clean debris
affecting rollers from frame.
nn. Align cylinders properly.
oo. Jog the motor to pressurize
hydraulic system.
pp. The squirrel is tired of running on its
wheel.
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