Troubleshooting - Graco A Series Instructions-Parts List Manual

WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
Problem
Pump fails to operate.
Pump operates but output is low on
both strokes.
Pump operates but output is low on
downstroke.
Pump operates but output is low on
upstroke.
Erratic or accelerated operation.
* 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.
306936
12

Troubleshooting

1. Relieve the pressure.
2. Check all possible problems and solutions before
Cause
Restricted line or inadequate air
supply.
Insufficient air pressure; closed or
clogged air valves, etc.
Exhausted fluid supply.
Damaged air motor.
Dried fluid seizure of displacement
rod (19).
Restricted line or inadequate air
supply.
Insufficient air pressure; closed or
clogged air valves, etc.
Exhausted fluid supply.
Clogged fluid line, gun, valves, etc.
Held open or worn intake valve.
Held open or worn fluid piston valve
or packings (14, 15).
Exhausted fluid supply.
Held open or worn intake valve.
Held open or worn fluid piston valve
or packings (14, 15).
disassembling pump.
Clear; increase air supply.
Open; clean (be sure to use air
filter).
Refill; purge all air from pump and
fluid lines.
Service air motor (see air motor
manual 306982, supplied).
Clean, check or replace throat pack-
ings (14, 15); always stop pump at
bottom of stroke and keep wet-cup
filled with compatible solvent.
Clear; increase air supply.
Open; clean (be sure to use air
filter).
Refill; purge all air from pump and
fluid lines.
Clear*.
Clear; service. See page 14 (for
Model 217529) or page NO TAG (for
Model 215930).
Clear; service. See page 14 (for
Model 217529) or page NO TAG (for
Model 215930).
Refill; purge all air from pump and
fluid lines.
Clear; service. See page 14 (for
Model 217529) or page NO TAG (for
Model 215930).
Clear; service. See page 14 (for
Model 217529) or page NO TAG (for
Model 215930).
Solution