Service; Troubleshooting Chart - Graco 224342 Instructions - Parts 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, follow the Pressure Relief Procedure on page 8. Discon-
nect 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.
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 valving mechanism;
stalling.
Dried fluid seizure of displacement
rod (13).
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 (2) too tight.
Loose packing nut (2) or worn throat
packings (5, 24).
Held open or worn intake valve.
Held open or worn fluid piston valve
or packings (20, 23).
Exhausted fluid supply.
Held open or worn intake valve.
Held open or worn fluid piston valve
or packings (20, 23).
disassembling pump.
Clear; increase air supply.
Open; clean.
Refill; purge all air from pump and
fluid lines.
Service air motor (see 306982 or
307043).
Clean, check, or replace throat
packings (5, 24); always stop pump
at bottom of stroke and keep wet-
cup filled with compatible solvent.
Clear; increase air supply.
Open; clean.
Refill; purge all air from pump and
fluid lines.
Clear.*
Loosen (see page 9).
Tighten packing nut (see page 9);
replace throat packings.
Clear; service.
Clear; service.
Refill; purge all air from pump and
fluid lines.
Clear; service.
Clear; service.
Solution
308116 11