17
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 34–36.
3. Check electrical supply with volt meter. Meter
should read 105–125 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 12 gauge wire and no longer than
150 ft.
4. Replace with a correct, grounded exten-
sion cord.
5. Check G1 and G2 leads from bridge (308) to
circuit board (79) for damaged or loose wires
or connectors. Refer to page 26.
5. Clean circuit board male terminals. Re-
place loose or defective lead terminals. Se-
curely reconnect lead terminals to board.
6. Check stall pressure. Refer to Pressure Con-
trol Adjustment on page 28.
6. Perform pressure control adjustment. See
page 28.
7. Check bridge (308) + and – leads and termi-
nals to motor . Inspect wiring insulation and
terminals for signs of overheating. See page
27.
7. Be sure male terminal blades are centered
and firmly connected to female terminals.
Replace any loose terminal or damaged
wiring. Securely reconnect wires to bridge.
8. Check for loose motor brush leads and termi-
nals. See page 23.
8. Tighten terminal screws. Replace brushes
if leads are damaged. See page 23.
9. Check for worn motor brushes which should
be 1/2” minimum. See page 23.
9. Replace brushes. See page 23.
10.Check for broken and misaligned motor brush
springs. Rolled portion of spring must rest
squarely on top of brush.
10.Replace spring if broken. Realign spring
with brush. See page 23.
11.Check motor brushes for binding in brush
holders. See page 23.
11.Clean brush holders, remove carbon dust
with small cleaning brush. Align brush lead
with slot in brush holder to assure free ver-
tical brush movement.
12.Check circuit board (79) by substituting with
a good circuit board. See page 26.
12.Replace circuit board. See page 26.
13.Check motor armature for shorts by using an
armature tester (growler) or perform spin test.
See page 20.
13.Replace motor. See page 2.
14. Check bridge (308) by substituting with a
good bridge or by performing the bridge test.
See page 21 or 25.
CAUTION
: Do not perform this check until
armature is determined to be good. A bad ar-
mature will immediately burn out a
good
bridge.
14.Replace bridge. See page 25.
