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LOW OUTPUT
TYPE OF PROBLEM
Low Output
WHAT TO CHECK
If check is OK, go to next check
1. Check for worn spray tip.
2. Check to see that pump does not continue to
stroke when gun trigger is released. Plug in
and turn on sprayer. Prime with paint. Trigger
gun momentarily, then release and engage
safety latch. Relieve pressure, turn off and un-
plug sprayer.
3. Check electrical supply with volt meter. Meter
should read 105–125 VAC.
4. Check extension cord size and length; must
be at least 12 gauge wire and no longer than
300 ft.
5. Check +, –, M+ and M– leads from motor to
pressure control circuit board (B1) for dam-
aged or loose wires or connectors. Inspect
wiring insulation and terminals for signs of
overheating. See page 27.
6. Check for loose motor brush leads and termi-
nals. See page 19.
7. Check for worn motor brushes which should
be 1/2" minimum. See page 19.
8. Check for broken and misaligned motor brush
springs. Rolled portion of spring must rest
squarely on top of brush.
9. Check motor brushes for
holders. See page 19.
10.Check stall pressure.
11. Check pressure control board (301) by substi-
tuting with a good pressure control board. See
page 22.
12.Check motor armature for shorts by using an
armature tester (growler) or perform spin test.
See page 17.
WHAT TO DO
When check is not OK refer to this column
1. Follow Pressure Relief Procedure Warn-
ing then replace tip. See your separate gun
or tip manual.
2. Service pump. See page 29 and manual
307–806.
3. Reset building circuit breaker; replace
building fuse. Repair electrical outlet or try
another outlet.
4. Replace with a correct, grounded exten-
sion cord.
5. Be sure male terminal blades are centered
and firmly connected to female terminals.
Replace any loose terminal or damaged
wiring. Securely reconnect terminals.
6. Tighten terminal screws. Replace brushes
if leads are damaged. See page 19.
7. Replace brushes. See page 19.
8. Replace spring if broken. Realign spring
with brush. See page 19.
binding in brush
9. Clean brush holders, remove carbon dust
with small cleaning brush. Align brush lead
with slot in brush holder to assure free verti-
cal brush movement.
10.Replace with new pressure control board
(301). See page 22.
11. Replace with new pressure control board
(301). See page 22.
12.Replace motor. See page 27.
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