Rev. 4/18/2018
SCTAB-FP, MANUAL
Copyright 2018 Vestil Manufacturing Co.
Page
14
of
15
Troubleshooting:
NOTE
: Use this guide in conjunction with the Troubleshooting section of your “Two-speed, auto-shifting foot pump
instruction manual” (Autoshifter manual). Solutions in
italics
are found in the Autoshifter manual.
Contact Vestil for
assistance with issues not covered in this guide.
Issue Explanation Solution
1. Piston does not extend
when I pump the pedal;
tabletop does not move.
a. Too much weight applied (load
exceeds capacity).
b. Too little oil in hydraulic system.
c. Pinched hydraulic hose.
d. Relief valve pressure setting too
low.
a. Reduce load to within table capacity.
b. Add oil until level is within one inch of top of
reservoir.
c. Correct as appropriate.
d. Increase pressure setting as necessary, but
NEVER more than 3,000psi
2. A lot of force is required
to pump the pedal
.
e. Autoshifter valve stuck in
deactivated position.
f. Load exceeds capacity.
e.
Remove port plug (10) from port marked “UL”
(on manifold); then remove piston. Inspect piston
and springs
.
f. Reduce load to be within capacity
3. Piston extends (table
rises) only when table
unloaded or pedal
pumped rapidly; I can
pump the pedal but the
piston does not move
(tabletop does not
move).
g. Pump is air locked.
h. Debris on seat of inlet check
valve.
i. Pressure setting of relief valve
needs adjustment.
j. Debris on seat of relief valve.
g.
Remove air from the pump (see “Purging Air
from Pump” on p. 2).
h.
Remove inlet check valve and clean debris from
valve seat (the bottom of the cavity in pump body
that valve fits into).
i. Increase pressure setting as necessary, but
NEVER more than 3,000psi.
j.
Remove relief valve and clean debris from valve
seat in pump body
.
4. Tabletop rises during
the down stroke of the
pedal, but descends
during the return stroke.
k. Outlet check valve stuck in open
position.
k.
Remove, disassemble, clean (with mineral spirits
or kerosene), reassemble and reinstall outlet
check valve assemblies
.
5. Have to keep pumping
pedal to maintain
tabletop height
l. Outlet check valve allowing oil to
return to pump chamber.
m. Release valve allowing oil to leak
back to the tank.
n. Unloader piston leaking.
l.
Remove both outlet check valves. Clean valves.
Score bottom of chamber for ball bearing
.
m.
Remove release valve assembly, inspect, clean,
& repair as necessary
.
n.
Replace unloader O-ring
.
6. Piston extends very
slowly when pumping.
Tabletop rises slowly.
o. Autoshifter valve stuck in open/
activated position (piston in)
o.
Remove port plug (10) from port marked “UL”
(on manifold (1)); then remove piston. Inspect
piston and springs.
7. Pump pedal feels
spongy or piston extends
in jerks
p. Debris interfering with leg rollers
q. Oil level is low
r. Air present in pump and/or
cylinders
p. Clean the inside of the frame and underside of
deck as necessary.
q. Add oil until level is within 1in. of top of reservoir.
r.
Purge air by following “Purging Air from the
Pump” and “Purging Air from the Cylinder” on p.
2.
8. Piston retracts very
slowly
s. Flow control valve obstructed
s. Remove valve and inspect for debris or non-
operating spool.
9. Piston retracts too
rapidly
t. Flow control valve obstructed or
not moving freely
t. Remove valve and inspect for debris or non-
operating spool.
10. Piston begins to
extend but stops
u. Air trapped in small pump
chamber
u.
Perform “Purging Air from the Pump” on p. 2.
