Filter
Top Products
10 307619
Troubleshooting
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
1. Relieve the pressure.
2. Check all possible problems and solutions before
disassembling pump.
Problem Cause Solution
Pump fails to operate. Restricted line or inadequate air
supply.
Clear; increase air supply.
Insufficient air pressure; closed or
clogged air valves, etc.
Open; clean (be sure to use air
filter).
Exhausted fluid supply. Refill; purge all air from pump and
fluid lines.
Damaged air valve; stalling. Service air motor (see air motor
manual, supplied).
Dried fluid seizure of displacement
rod (103).
Clean, check or replace throat pack-
ings (114, 123); always stop pump at
bottom of stroke and keep wet-cup
filled with compatible solvent.
Pump operates but output is low on
both strokes.
Restricted line or inadequate air
supply.
Clear; increase air supply.
Insufficient air pressure; closed or
clogged air valves, etc.
Open; clean (be sure to use air
filter).
Exhausted fluid supply. Refill; purge all air from pump and
fluid lines.
Clogged fluid line, valves, etc. Clear* (be sure to use fluid filter).
Packing nut (104) is too tight. Loosen (see page 8).
Loose packing nut (104) or worn
throat packings (114, 123).
Tighten packing nut (see page 8);
replace throat packings.
Pump operates but output is low on
downstroke.
Held open or worn intake valve. Clear; service. See page 12.
Pump operates but output is low on
upstroke.
Held open or worn fluid piston valve
or packings (115, 124).
Clear; service. See page 12.
Erratic or accelerated operation. Exhausted fluid supply. Refill; purge all air from pump and
fluid lines.
Held open or worn intake valve. Clear; service. See page 12.
Held open or worn fluid piston valve
or packings (115, 124).
Clear; service. See page 12.
* To determine if the fluid hose or gun is obstructed, relieve the pressure and disconnect the fluid hose, and place
a container at the pump fluid outlet to catch any fluid. Turn on the air just enough to start the pump (about 20 to
40 psi [0.14 to 0.28 MPa, 1.4 to 2.8 bar]). If the pump starts when the air is turned on, the obstruction is in the
fluid hose or gun.