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5.
"Spongy·
or "Jerky· unit operation.
6. Unit lowers too slowly when
7.
Unit lowers too
quickly.
8. Unit raises then lowers slowly.
9. Carriage elevates, but does not
Copyright 2016 Vestil Manufacturing Corp.
rev. 11/1/2016
s.
Fluid
starvation.
t. Air in
system.
loaded.
u. Lowering solenoid valve filter screen
clogged.
v. Pinched tube or
w.
Foreign material in flow control valve.
x. Binding
cylinders.
y. Foreign material in velocity fuse.
z. Foreign material stuck in flow control
valve.
(In
this case, carriage initially lowers
at a normal rate but accelerates as the
carriage descends).
aa.
Lowering solenoid valve may be
incorrectly wired or is stuck open
bb. Check valve may be stuck open.
cc. Check for leaking hoses, fittings,
dd.
Cylinder packings may be worn or
damaged.
lower.
ee. Incorrect lowering solenoid valve
wiring.
ff.
Lowering solenoid valve is stuck.
gg. Faulty lowering solenoid coil.
hh. Binding cylinders.
ii. If the carriage lowers too rapidly, air is
present in the hydraulic system causing the
velocity fuse to activate and shut off the oil
flow from the
deck will not lower.
CB-PMPS, manual.doc
hose.
pipes.
cylinders. Consequently,
the
s.
See 2
(d),
(f),
(g), (j)
t.
See air bleed procedure (p. 19).
u.
Remove lowering solenoid valve and
clean filter screen.
v. Correct as necessary.
w.
Remove and clean flow control valve.
Refer to Hydraulic System Diagram on p.
3).
x.
Align cylinders correctly.
y. Remove and clean velocity fuse. Refer
to Hydraulic System Diagram on p.
z. Remove flow control valve from the
valve block and clean. (Refer to Hydraulic
System Diagram on p.
3).
aa.
See 3
(a).
bb. Remove and clean check
to Hydraulic Section of Owner's
cc. See 2 (c).
dd.
Replace packings
(contact
replacement parts).
ee.
Correct per diagram (p.
8-10).
ff.
Lightly tap down the solenoid coil body
to seat it
properly.
(DO NOT hit coil hard as
it will permanently damage the internal
system.
DO NOT remove the solenoid
valve from the block because
will descend dangerously quickly.
gg.
Remove and replace. DO NOT remove
the down solenoid valve fro the block as
the unit will come down at a dangerous
speed.
hh.
See 4 (c).
ii.
To unlock, re-pressurize the hydraulic
system.
Page 19 of 23
3).
valve;
(Refer
Manual).
factory for
the
carriage
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