9
309902
Troubleshooting
MOTOR WON’T OPERATE (Continued)
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
Basic Electrical Problems
(continued)
5.
That motor leads are securely fastened and
properly mated.
5. Replace loose terminals; crimp to leads. Be
sure terminals are firmly connected.
Clean circuit board terminals. Securely re-
connect leads.
6. For loose motor brush lead connections and
terminals. See page 14.
6. Tighten terminal screws. Replace brushes
if leads are damaged. See page 14.
7. Brush length which must be 1/2 in. minimum.
See page 14.
NOTE:
Brushes do not wear at the same rate
on both sides of motor. Check both brushes.
7. Replace brushes. See page 14.
8. For broken or misaligned motor brush springs.
Rolled portion of spring must rest squarely on
top of brush. See page 14.
8. Replace spring if broken. Realign spring
with brush. See page 14.
9. Motor brushes may be binding in brush hold-
ers. See page 14.
9. Clean brush holders. Remove carbon with
small cleaning brush. Align brush leads
with slot in brush holder to assure free verti-
cal brush movement.
10.Motor armature commutator for burn spots,
gouges and extreme roughness.
See page 14.
10.Remove motor and have motor shop resur-
face commutator if possible, page 24.
11. Motor armature for shorts using armature
tester (growler) or perform spin test. See page
13.
11. Replace motor, page 24.
Refer to wiring diagrams to
identify test points (TP).
1. Power supply cord (66). Connect volt meter
between TP1 (neutral) and TP2 (L2, 120
VAC). Plug in sprayer. Meter must read
85--130 VAC for 100--120 VAC models.
Unplug sprayer.
1. Replace power supply cord.
2. ON/OFF switch (23). Connect volt meter be-
tween L1 or L and L2 or N terminal on ON/
OFF switch. Plug in sprayer and turn ON.
Meter must read 85--130 VAC for 100--120
VAC models.
2. Replace ON/OFF switch, page 16.
3. Motor thermal cutoff switch. Turn sprayer OFF.
Check for continuity between TO1 and TO2
with ohmmeter.
3. If thermal switch is open (no continuity), al-
low motor to cool. If switch remains open
after motor cools, replace motor. If thermal
switch closes after motor cools, correct
cause of overheating.
4. All terminals for damage or loose fit.
4. Replace damaged terminals and reconnect
securely.
