Graco FinishPro II 395 Manual page 15

Problem
Low Fluid Output
333126A
What To Check
(If check is OK, go to next check)
1. Worn 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 termi-
nals for signs of overheating.
8. Worn motor brushes which must be
1/4 in. (6 mm) minimum.
9. Motor brushes binding in brush hold-
ers.
10. Low stall pressure. Turn pressure
control knob fully clockwise.
11. Motor armature for shorts by using
an armature tester (growler) or per-
form spin test, page 21.
What To Do
(When check is not OK, refer to this column)
Relieve pressure, page 11. Replace tip. Refer to
gun instruction manual, 311937.
Service pump. See page 18, Displacement Pump
Replacement.
Relieve pressure, page 11. Then repair prime
valve. See page 31, Pressure Control Replace-
ment.
Tighten any loose connections. Check o-rings on
suction hose swivel.
Reset building circuit breaker; replace building fuse.
Repair electrical outlet or try another outlet.
Replace with a correct, grounded extension cord.
See page 10, Grounding and Electric
Requirements.
Be sure male terminal pins are centered and firmly
connected to female terminals. Replace any loose
terminals or damaged wiring. Securely reconnect
terminals.
Replace brushes. See page
Replacement.
Clean brush holders. Remove carbon dust by using
compressed air to blow out brush dust.
Replace pressure control assembly. See page 31,
Pressure Control Assembly Replacement.
Replace motor. See page 35, Motor Replacement.
Troubleshooting
23
. Motor Brush
15