Rev. 4/18/2018
CART-DC, MANUAL
Copyright 2018 Vestil Manufacturing Co.
Page
14
of
15
j. Low battery charge.
and cycle the pump. If no oil output,
check pump-motor coupling. Contact
factory to order replacement pump, if
necessary
.
j.
Recharge battery
.
2. Forks rise too slowly
k. Debris stuck in lowering solenoid valve
causing portion of fluid to flow to
reservoir.
l. Debris clogging suction filter or breather
cap.
m. Pinched hose.
n. Low motor voltage.
o. Too much weight applied to tabletop.
p. Pump malfunctioning.
q. Insufficient battery charge.
k.
Lower tabletop. Remove solenoid valve
and clean
.
l.
Correct as appropriate (see also
solutions “f” and ‘h”)
.
m. Repair the hose.
n.
Measure voltage at motor terminals (or
as close to terminals as possible) while
pump runs under load. If voltage is
adequate, check wiring.
o. R
educe weight applied to tabletop. DO
NOT change relief valve setting!!
p.
Disconnect hydraulic line from cylinder.
Put free end of hose in large container
and cycle the pump. If no oil output,
check pump-motor coupling. Contact
factory to order replacement pump, if
necessary
.
q.
Recharge battery
.
3. Motor labors or is really hot
r. Low voltage.
s. Incorrect wiring.
t. Oil starvation causing pump to bind.
High heat produced. Pump might be
permanently damaged.
u. Binding cylinders.
v. Insufficient battery charge.
r. See solution a.
s.
Confirm that one leg of motor line not
connected to ground
.
t. See d, f, g, h, and i.
u. Contact technical service.
v.
Recharge battery
.
4. Tabletop rises in jerks or
support of the tabletop feels
spongy.
w. Fluid starvation.
x. Air trapped in cylinder(s).
w. See solutions d, f, g, I.
x. See “Removing air from hydraulic
system”.
5. Tabletop lowers too slowly
when loaded.
y. Filter of lowering solenoid valve
clogged.
z. Pinched hydraulic hose.
aa. Debris in flow control valve.
bb. Binding cylinders.
cc. Debris in velocity fuse.
y.
Remove lowering solenoid. Clean filter
.
z. Repair hose.
aa.
Remove and clean flow control valve
.
bb. Contact technical service.
cc.
Remove and clean fuse
.
6. Tabletop lowers too rapidly.
dd. Leaking hoses and/or fittings.
ee. Check valve stuck open.
ff. Debris in flow control valve.
dd. Repair as appropriate.
ee. Remove and clean check valve.
ff.
Remove flow control valve from
manifold and clean
.
7. Tabletop rises but does not
maintain elevation and slowly
lowers on its own.
gg. Lowering solenoid valve incorrectly
wired or stuck open.
hh. Check valve stuck open.
ii. Leaking hoses or fittings.
jj. Cylinder packing worn or damaged.
gg.
See solution k
.
hh. Remove and clean check valve.
ii. Repair
as
appropriate.
jj. Replace
packing.
8. Tabletop rises but does not
lower.
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.
kk. Correct wiring.
ll.
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
.
mm. Refer to electrical system diagram
nn. Raise tabletop a clean debris
affecting rollers from frame.
oo. Contact technical service.
pp.
Jog motor to repressurize hydraulic
system
.
9. Erratic operation
qq. Insufficient battery charge.
qq.
Recharge battery
.