Troubleshooting
3A2333B 11
Motor runs but pump does
not stroke
Displacement pump pin damaged or
missing; see pump manual.
Replace pump pin if missing. Be sure retainer
spring is fully in groove all around connecting
rod; see pump manual.
Connecting rod assembly damaged;
see pump manual.
Replace connecting rod assembly; see pump
manual.
Gears or drive housing damaged,
page 27.
Inspect drive housing assembly and gears for
damage and replace if necessary; see pump
manual.
Excessive paint leakage
into throat packing nut
Throat packing nut is loose Remove throat packing nut spacer. Tighten
throat packing nut just enough to stop leakage.
Throat packings are worn or
damaged
Replace packings; see pump manual.
Displacement rod is worn or
damaged
Replace rod; see pump manual.
Fluid is spitting from gun Air in pump or hose Check and tighten all fluid connections. Cycle
pump as slowly as possible during priming.
Tip is partially clogged Clear tip; see pump manual.
Fluid supply is low or empty Refill fluid supply. Prime pump; see pump man-
ual. Check fluid supply often to prevent running
pump dry.
Pump is difficult to prime Air in pump or hose Check and tighten all fluid connections. Cycle
pump as slowly as possible during priming.
Intake valve is leaking Clean intake valve. Be sure ball seat is not
nicked or worn and that ball seats well. Reas-
semble valve.
Pump packings are worn Replace pump packings; see pump manual.
Paint is too thick Thin the paint according to supplier recommen-
dations.
No display, sprayer oper-
ates
Display is damaged or has bad
connection
Check connections. Replace display.
TYPE OF PROBLEM
WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK, refer to this column
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