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Troubleshooting
NOTE: Check all possible problems and solutions before disassembling the pump.
PROBLEM
CAUSE SOLUTION
Pump fails to operate. Restricted line or inadequate air supply. Clear line; increase air supply.
Insufficient air pressure; closed or
clogged air valves, etc.
Open, clean.
Exhausted fluid supply. Refill; purge all air from pump and fluid
lines.
Damaged air valving mechanism; stalling. Service air motor (see manual, supplied).
Dried fluid seizure of displacement rod
(26).
Clean rod; check or replace throat pack-
ings (18, 23); always stop pump at bot-
tom of stroke and keep wet-cup filled with
compatible solvent.
Pump operates but out-
put is low on both
strokes.
Restricted line or inadequate air supply. Clear line; increase air supply.
Insufficient air pressure; closed or
clogged air valves, etc.
Open, clean.
Exhausted fluid supply. Refill; purge all air from pump and fluid
lines.
Clogged fluid line, valves, etc. Clear*.
Packing nut (36) is too tight. Loosen (see page 9).
Loose packing nut (36) or worn throat
packings (18, 23).
Tighten packing nut (see page 9);
replace throat packings (see page 14).
Pump operates but out-
put is low on down
stroke.
Held open or worn intake valve. Clear; service. See page 14.
Pump operates but out-
put is low on down
stroke.
Held open or worn fluid piston valve or
packings (18, 23).
Clear; service. See page 14.
Erratic or accelerated op-
eration.
Exhausted fluid supply. Refill; purge all air from pump and fluid
lines.
Held open or worn intake valve. Clear; service. See page 14.
Held open or worn fluid piston valve or
packings (18, 23).
Clear; service. See page 14.
* To determine if the fluid hose or gun is obstructed, relieve the pressure. 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 20–40
psi [0.14–0.28 MPa, 1.4–2.8 bar]). If the pump starts when the air is turned on, the obstruction is in the fluid
hose or gun.