Table of Contents
Advertisement
Table of Contents
Troubleshooting:
Contact Vestil for assistance with issues not listed below.
Issue
1. Cylinder/piston does not
extend when UP button
pressed, but pump is
running.
2. Piston extends slowly
3. Motor labors or is really
hot
4. Piston extends in jerks
or feels spongy.
Table of Contents
Rev. 11/27/2018
Explanation
a. Voltage at motor terminals too low to
run pump;
b. Hydraulic hose leaking;
c. Fluid level in hydraulic reservoir too
low;
d. Load exceeds capacity/max. rated
load limit, i.e. relief valve opening;
e. Clogged suction filter;
f. Suction line leaking or loose fittings;
g. Clogged filler/breather cap on tank;
h. Lowering valve energized by faulty
wiring or stuck open;
i. Hydraulic pump malfunctioning;
j. Power source interruption.
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. Load exceeds capacity;
p. Pump malfunctioning;
q. Low voltage;
r. Incorrect wiring;
s. Oil starvation causing pump to bind.
High heat produced. Pump might be
permanently damaged;
t. Binding cylinder(s);
u. Insufficient battery charge.
v. Fluid starvation
w. Air trapped in cylinder(s)
Copyright 2018 Vestil Manufacturing Co.
MPU-AC GEN2, MANUAL
Remedy
a. Measure voltage at motor terminals
(or as close to terminals as possible)
while pump runs under load. If
voltage is adequate, check wiring.
Compare wiring to applicable
diagram. Contact Technical Support.
b. Correct as appropriate.
c. Add fluid.
The system uses HO150
hydraulic fluid. Replace the hydraulic
fluid with an anti-wear hydraulic fluid
of viscosity grade of 150 SUS at
100°F (ISO 32 @ 40°C) such as AW-
32 or Dexron transmission fluid.
Reduce weight of load. DO NOT
d.
change relief valve setting!!
e. Remove filter and clean it.
f. Inspect all fittings for proper fit.
g. Remove and clean.
h. Remove lowering valve and clean
(see instructions on
p.
19).
i. 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.
j. Check electrical utility at socket.
k. Remove solenoid valve and clean
(see instructions on
p.
19).
l. Correct as appropriate (see also
remedies
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.
Compare wiring to applicable
diagram. Contact Technical Support.
o. R
educe load. 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. See remedy a.
r. Confirm that neither motor line is
connected to ground.
s. See d, f, g, h, and i.
t. Align cylinder(s).
u. Recharge battery.
v. See remedies d, f, g, I.
w. See "Bleeding air from hydraulic
Page 21 of 23
Advertisement
Table of Contents
