Graco FinishPro 290 Operation Manual page 37

Problem
Low Fluid Output
313797C
What To Check
(If check is OK, go to next check)
1. Worn or clogged spray tip.
2. Verify pump does not continue
to stroke when gun trigger
is released.
3. Prime valve leaking.
4. Suction hose connections.
5. Electric supply with volt meter.
Meter must read 105-130 Vac for
110-120 Vac models and 210-255
for 240 Vac models. Low voltages
reduce sprayer performance.
6. Extension cord size and length.
7. Leads from motor to circuit
board for damaged or loose
wire connectors. Inspect wiring
insulation and terminals for
signs of overheating.
8. Worn motor brushes which must
be 1/4 in. (6 mm) minimum.
9. Motor brushes binding in brush
holders.
10. Low stall pressure. Turn pressure
control knob fully clockwise.
11. Motor armature for shorts
by using an armature tester
(growler) or perform spin test,
page 54.
12. Pump is primed.
13. Inlet and outlet balls are not
stuck.
基本故障排除
Basic Troubleshooting /
What To Do
(When check is not OK, refer to this column)
Relieve pressure, page 15. Replace or clean tip.
Refer to gun instruction manual, 313347.
Service Pump, page 58.
Relieve pressure, page 15. Then repair Prime Valve,
page 60.
Tighten any loose connections. Check o-rings
on suction hose tube.
Reset building circuit breaker; replace building fuse.
Repair electrical outlet or try another outlet.
Replace with a correct, grounded extension cord,
page 12.
Be sure male terminal pins are centered and firmly
connected to female terminals. Replace any loose
terminals or damaged wiring. Securely reconnect
terminals.
Replace Motor, page 33.
Clean brush holders. Remove carbon dust by using
compressed air to blow out brush dust.
Replace Pressure Control Assembly, page 60.
Replace Motor, page 33.
Prime pump, page 19.
Inlet: Remove suction tube and place pencil into inlet
housing to dislodge ball and allow proper priming.
Outlet: Insert screwdriver in slot and remove
Easy-Access door, page 11. Unscrew outlet valve
with a 3/4 in. socket. Remove and clean assembly.
기본적인 문제 해결
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