Rev. 8/4/2020
P-JIB MANUAL
Copyright 2020 Vestil Manufacturing Co.
Page
12
of
14
(B) Inspect the following
at least once per month
:
1)
Oil level
. Lower the boom completely. Oil should be within ¾in. of the top of the tank with the boom in the
fully lowered position. See
Subpart C
, “Yearly inspection”.
2)
Hoses
. Check for cuts, kinks, and other damage. Confirm that the ends of the hose are firmly fastened to
the pump and the cylinder.
3) Hardware. Check the integrity of all nuts, bolts, and pins. Replace any item that is damaged.
4)
Casters
. Move the crane a short distance. Determine whether each caster is loose, severely worn, or
damaged. Clean the casters. Replace casters that do not roll smoothly or are bent or cracked.
5)
Winch, cable, and pulleys
. Examine the cable for frays, broken strands, kinks, etc. Make sure that the
cable clamp (connects the hook to the cable) is secure. Make sure that all pulleys operate satisfactorily.
Confirm that hardware is in satisfactory condition.
6)
Labels
. Check all labeling. The crane should be labeled as shown in the
(C) Regularly inspect the hydraulic oil (at least twice per year)
In addition to the inspections described in parts A and B, check the hydraulic fluid at least twice per year.
Change the oil immediately if it darkens, becomes gritty, or turns a milky color (indicating the presence of water).
Replace the hydraulic fluid with anti-wear hydraulic oil of viscosity grade 150 SUS at 100°F, (ISO 32 at 40°C).
Examples of proper hydraulic fluid are AW 32 and HO 150 hydraulic oil, and non-synthetic transmission fluid. You
may use a synthetic transmission fluid if you flush the system with the synthetic fluid before filling the reservoir.
TROUBLESHOOTING
Refer to
Manual Hydraulic Pump Exploded View
and Bill of Materials on page 9.
Issue
Explanation
Remedy
1. Cylinder does not
extend when I
move the handle
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. Remove enough of load that weight of load is
within 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 to more than 3,000psi
2. A lot of force is
required to move
the handle
e. Autoshifter valve stuck in
deactivated position.
f. Load exceeds capacity.
e. Remove port plug from port marked “UL” (on
manifold); then remove piston. Inspect piston
and springs
f. Reduce load to be within capacity
3. Cylinder extends
only when
unloaded or
handle pumped
rapidly. -OR-
I can pump the
handle but the
cylinder 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
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. Cylinder extends
during down stroke
of handle, but
lowers during
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 handle to
maintain cylinder
extension
l. Outlet check valve allowing oil to
return to pump chamber.
m. Release valve allowing oil to leak
back to the tank.
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
6. Pump feels
spongy or cylinder
extends in jerks
n. Oil level is low
o. Air present in pump and/or
cylinder
n. Add oil until within 1in. of top of reservoir.
o. Purge air by following
on p. 11.
7. Cylinder retracts
very slowly
p. Flow control valve obstructed
p. Remove valve and inspect for debris or non-
operating spool
8. Cylinder retracts
too rapidly
q. Flow control valve obstructed or
not moving freely
q. Remove valve and inspect for debris or non-
operating spool