Troubleshooting - Graco HYDRA–SPRAY President 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 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.
10 307619

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 valve; stalling.
Dried fluid seizure of displacement
rod (103).
Restricted line or inadequate air
supply.
Insufficient air pressure; closed or
clogged air valves, etc.
Exhausted fluid supply.
Clogged fluid line, valves, etc.
Packing nut (104) is too tight.
Loose packing nut (104) or worn
throat packings (114, 123).
Held open or worn intake valve.
Held open or worn fluid piston valve
or packings (115, 124).
Exhausted fluid supply.
Held open or worn intake valve.
Held open or worn fluid piston valve
or packings (115, 124).
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, supplied).
Clean, check or replace throat pack-
ings (114, 123); 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* (be sure to use fluid filter).
Loosen (see page 8).
Tighten packing nut (see page 8);
replace throat packings.
Clear; service. See page 12.
Clear; service. See page 12.
Refill; purge all air from pump and
fluid lines.
Clear; service. See page 12.
Clear; service. See page 12.
Solution