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Troubleshooting
SYMPTOM PROBABLE CAUSE TEST PROCEDURE REMEDY
3. Pump runs but
does not main-
tain constant
pressure
a. Air in fluid line
b. Air line too small
c. Obstructed or worn ball
(57) and seat (49)
d. Worn fluid piston (17)
and/or piston seal (13)
e. Air control valve
mufflers (38) plugged
f. Air control valve dirty or
worn
g. Lack of lubrication
h. Dirty air passages
a. Check for spitting at
fluid line outlet
c. Pump fast cycles on
one end of stroke
indicates that side is by-
passing
d. Pump fast cycles on
one end of stroke
indicates that side is by-
passing
e. Check for slow air flow
at muffler
g. Pump reacts slowly
h. Check for sluggish air
control valve operation
a. Bleed fluid line until con-
stant flow is
obtained
b. Install larger air line,
minimum size 1/2 in.
c. Remove, clean, and in-
spect seat, ball, and ball
guide (56). Replace if
worn. See page 15.
d. Replace piston and/or
seal. See page 16.
e. Remove and clean muf-
flers
f. Repair or replace air
control valve. See page
20.
g. Adjust lubricator
h. Clean air passages; do
not enlarge orifices.
Empty air line filter and/
or control valve filter
(40q). See step 5 in Dis-
assembly on page 20.
4. Paint dripping
externally
around piston
rod
a. Ruptured bellows seal
(14)
a. Check for presence of
paint around piston
shaft (15)
a. Replace bellows seal.
See page 16. Be sure
to suction feed, not
pressure feed, pump.
Maximum fluid inlet
pressure is 15 psi (104
kPa, 1.04 bar)