Graco 30:1 President [12/24] Troubleshooting
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Graco 30:1 President [12/24] Troubleshooting

Graco 30:1 President [12/24] Troubleshooting
12 308106
Troubleshooting
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
1. Relieve the pressure.
2. Check all possible causes and problems before
disassembling the 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.
Exhausted fluid supply Refill; purge all air from pump and fluid lines.
Damaged air valving mechanism; stall-
ing
Service air motor (see 306982 or 307043).
Dried fluid seizure of displacement rod
(19)
Clean, check or replace throat packings (8, 13); al-
ways stop pump at bottom of stroke and keep wet-
cup filled with compatible solvent.
Pump operates, but
output low on both
Restricted line or inadequate air supply Clear; increase air supply.
output low on both
strokes
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, valve, etc. Clear.*
Packing nut (4) too tight Loosen (see page 10).
Loose packing nut (4) or worn throat
packings (8, 13).
Tighten packing nut (see page 10);
replace throat packings
Pump operates, but
output low in down
stroke
Held open or worn intake valve Clear; service.
Pump operates, but
output low on up stroke
Held open or worn fluid piston valve or
packings (8, 13).
Clear; service.
Erratic or accelerated
operation
Exhausted fluid supply Refill; purge all air from pump and fluid lines
operation
Held open or worn intake valve Clear; service.
Held open or worn fluid piston valve or
packings (8, 13).
Clear; service.
* 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 [140–280 kPa, 1.4–2.8 bar]). If
the pump starts when the air is turned on, the obstruction is in the fluid hose or gun.

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