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Troubleshooting
10 311911C
Low Fluid Output 1. Worn spray tip. Relieve pressure, page 7. Replace tip. Refer to gun
instruction manual, 311937.
2. Verify pump does not continue to
stroke when gun trigger is released.
Service pump. See page 13, Displacement Pump
Replacement.
3. Prime valve leaking. Relieve pressure, page 7. Then repair prime valve.
See page 28, Pressure Control Replacement.
4. Suction hose connections. Tighten any loose connections. Check o-rings on
suction hose swivel.
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.
Reset building circuit breaker; replace building fuse.
Repair electrical outlet or try another outlet.
6. Extension cord size and length. Replace with a correct, grounded extension cord.
See page 6, Grounding and Electric Require-
ments.
7. Leads from motor to circuit board for
damaged or loose wire connectors.
Inspect wiring insulation and termi-
nals for signs of overheating.
Be sure male terminal pins are centered and firmly
connected to female terminals. Replace any loose
terminals or damaged wiring. Securely reconnect
terminals.
8. Worn motor brushes which must be
1/4 in. (6 mm) minimum.
Replace brushes. See page 18. Motor Brush
Replacement.
9. Motor brushes binding in brush hold-
ers.
Clean brush holders. Remove carbon dust by using
compressed air to blow out brush dust.
10. Low stall pressure. Turn pressure
control knob fully clockwise.
Replace pressure control assembly. See page 28,
Pressure Control Assembly Replacement.
11. Motor armature for shorts by using
an armature tester (growler) or per-
form spin test, page 16.
Replace motor. See page 34, Motor Replacement.
Problem
What To Check
(If check is OK, go to next check)
What To Do
(When check is not OK, refer to this column)