14
307-889
LOW OUTPUT
TYPE OF PROBLEM
WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK refer to this column
Low Output
1. Check for worn spray tip.
1. Follow
Pressure Relief Procedure Warn-
ing
then replace tip. See your separate gun
or
tip manual.
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.
2. Service pump. See pages 28–30.
3. Check electrical supply with volt meter. Meter
should read 200–250 VAC.
3. Reset building circuit breaker; replace
building fuse. Repair electrical outlet or try
another outlet.
4. Check extension cord size and length; must
be at least 1.5 mm
2
(12 AWG) wire and no
longer than 100m (300 ft).
4. Replace with a correct, grounded exten-
sion cord.
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 26.
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. Check for loose motor brush leads and termi-
nals. See page 19.
6. Tighten terminal screws. Replace brushes
if leads are damaged. See page 19.
7. Check for worn motor brushes which should
be 12 mm (1/2 in.) minimum. See page 19.
7. Replace brushes. See page 19.
8. Check for broken and misaligned motor brush
springs. Rolled portion of spring must rest
squarely on top of brush.
8. Replace spring if broken. Realign spring
with brush. See page 19.
9. Check motor brushes for binding in brush
holders. See page 19.
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.Check stall pressure. Gauge should read 170
bar (2500 psi) minimum.
10.Replace with new pressure control board
(301). See page 22.
11.Check pressure control board (301) by substi-
tuting with a good pressure control board. See
page 22.
11.Replace with new pressure control board
(301). See page 22.
12.Check motor armature for shorts by using an
armature tester (growler) or perform spin test.
See page 16.
12.Replace motor. See page 26.
