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Troubleshooting
12 310824D
Low Output 1. Worn spray tip. Relieve pressure, page 8. Replace tip. Refer to
gun instruction manual, 309639.
2. Verify pump does not continue to
stroke when gun trigger is
released.
Service pump. See page 14, Displacement
Pump Replacement.
3. Prime valve leaking. Relieve pressure, page 8. Then repair prime
valve. See page 24, Manifold 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 100-130 VAC for
110-120 VAC models and
210-255 for 240 VAC models.
Low voltages reduce sprayer per-
formance.
Reset building circuit breaker; replace building
fuse. Repair electrical outlet or try another
outlet.
6. Extension cord size and length. 7. Replace with a correct, grounded extension
cord. See page 7, Grounding and Electric
Requirements.
8. Leads from motor to circuit board
for damaged or loose wire con-
nectors. Inspect wiring insulation
and terminals for signs of over-
heating.
Be sure male terminal pins are centered and
firmly connected to female terminals. Replace
any loose terminals or damaged wiring.
Securely reconnect terminals.
9. Worn motor brushes which must
be 1/4 in. (6 mm) minimum.
Replace brushes. See page 19. Motor Brush
Replacement.
10. Motor brushes binding in brush
holders.
Clean brush holders. Remove carbon dust by
using compressed air to blow out brush dust.
11. Low stall pressure. Turn pressure
control knob fully clockwise.
Replace pressure control assembly. See page
23, Pressure Control Assembly Replace-
ment.
12. Motor armature for shorts by
using an armature tester
(growler) or perform spin test,
page 17.
Replace motor. See page 27, 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)