Graco 278680, Instructions Manual, Page: 12 / 28

Troubleshooting
12 332257A
Low Output For worn spray tip. Relieve pressure, page 8. Then
replace tip. See your separate gun
manual for additional instruction.
Verify pump does not continue to
stroke when gun trigger is released. Service pump. See page 15.
Filter clogged. Relieve pressure, page 8. Check
and clean filter.
Prime valve leaking. Relieve pressure , page 8. Repair
prime valve.
Suction hose kinks and/or loose
connection. Correct kink and/or tighten any loose
connections.
Electric supply with volt meter. Low
voltages reduce sprayer
performance. Meter must read:
• 210-255 VAC for 220-240V
models
Reset building circuit breaker;
replace building fuse. Repair
electrical outlet or try another outlet.
Extension cord size and length; must
be at least 12 gauge wire and no
longer than 300 ft. Longer cord
lengths reduce sprayer performance. Replace with a correct, grounded,
extension cord.
Low Output Leads from motor to pressure control
circuit board for damaged or loose
wires or connectors. Inspect wiring
insulation and terminals for signs of
overheating. Be sure male terminal blades are
centered and firmly connected to
female terminals. Replace any loose
terminal or damaged wiring. Securely
reconnect terminals.
Low stall pressure. Do either or both:
a. Turn pressure control knob
fully clockwise. Make sure
pressure control knob is
properly installed to allow full
clockwise position.
b. Try a new transducer.
Type of Problem
What to Check
(if check is OK, go to next)
What to Do
(When check is not OK, refer to this
column)