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Troubleshooting
Relieve the pressure, and check all probable causes
before disassembling the pump.
WARNING
PRESSURIZED EQUIPMENT HAZARD
To reduce the risk of a serious injury whenever you
are instructed to relieve pressure, follow the Pres-
sure Relief Procedure on page 10.
SYMPTOM PROBABLE CAUSE TEST PROCEDURE REMEDY
1. Pump will not
prime
Air is getting into the intake
housing:
a. Defective o-ring (19) on in-
take manifold or accumu-
lator
b. Suction hose/tube not
sealed
a. Replace o-ring.
See page 15.
b. Tighten, or add
sealant to threads
2. Pump will not
run
a. Air supply turned off
b. Fluid valve turned off
c. Air pressure regulator
set too low
d Pilot valve assemblies
worn
e. Air control valve
defective
f. Air piston quad ring (28)
worn
c. Minimum air pressure
on regulator 25 psi (175
kPa, 1.95 bar), depend-
ing on fluid being
pumped
d. Remove tube ends from
hose studs. With air
supply on, alternately
plug tube ends. If pump
runs, remove pilot
valves, inspect
e. Check for air coming
from exhaust when
pump is not running
a. Turn air supply on
b. Turn fluid supply
valve on
c. Increase air pressure
regulator adjustment
d. Repair or replace pilot
valve assembly. See
page 22.
e. Repair or replace air
control valve. See page
20.
f. Replace quad ring. See
page 18.