Troubleshooting
12
308116V
Troubleshooting
, page 9,
before checking or repairing the pump.
2. Check all possible problems and causes before
disassembling pump.
* To determine if the fluid hose or gun is obstructed, perform the
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 [0.1-0.3 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.
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.
Exhausted fluid supply.
Refill; purge all air from pump and fluid
lines.
Damaged air valving mechanism;
stalling.
Service air motor (see
, page 2).
Dried fluid seizure of displacement rod
(13).
Clean, check, or replace throat packings
(5, 24); 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.
Exhausted fluid supply.
Refill; purge all air from pump and fluid
lines.
Clogged fluid line, valves, etc.
Clear.*
Packing nut (2) too tight.
Loosen (see page 10).
Loose packing nut (2) or worn throat
packings (5, 24).
Tighten packing nut (see page 10);
replace throat packings.
Pump operates but output is low on
downstroke.
Held open or worn intake valve.
Clear; service.
Pump operates but output is low on
upstroke.
Held open or worn fluid piston valve or
packings (20, 23).
Clear; service.
Erratic or accelerated operation.
Exhausted fluid supply.
Refill; purge all air from pump and fluid
lines.
Held open or worn intake valve.
Clear; service.
Held open or worn fluid piston valve or
packings (20, 23).
Clear; service.
