6 824191
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)
1. That motor leads are securely fastened and
properly mated.
1. Replace loose terminals; crimp to leads. Be
sure terminals are firmly connected.
Clean circuit board terminals. Securely re-
connect leads.
2. For loose motor brush lead connections and ter-
minals. See page 10.
2. Tighten terminal screws. Replace brushes if
leads are damaged. See page 10.
3. Brush length which must be 1/2 in. minimum.
See page 10.
NOTE: Brushes do not wear at the same rate on
both sides of motor. Check both brushes.
3. Replace brushes. See page 10.
4. For broken or misaligned motor brush springs.
Rolled portion of spring must rest squarely on
top of brush. See page 10.
4. Replace spring if broken. Realign spring with
brush. See page 10.
5. Motor brushes may be binding in brush holders.
See page 10.
5. Clean brush holders. Remove carbon with
small cleaning brush. Align brush leads with
slot in brush holder to assure free vertical
brush movement.
6. Motor armature commutator for burn spots,
gouges and extreme roughness.
See page 10.
6. Remove motor and have motor shop resur-
face commutator if possible. See page 16.
7. Motor armature for shorts using armature tester
(growler) or perform spin test. See page 10.
7. Replace motor. See page 16.
Refer to wiring diagram on
page 12 to identify test
points (TP).
1. Power supply cord (79). Connect volt meter be-
tween TP1 (neutral) and TP2 (L2, 120 Vac).
Plug in sprayer. Meter must read 85–130 Vac.
Unplug sprayer.
1. Replace power supply cord.
2. ON/OFF switch (23). Connect volt meter be-
tween L1 and L2 terminal on ON/OFF switch.
Plug in sprayer and turn ON. Meter must read
85–130 Vac.
2. Replace ON/OFF switch. See page 12.
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), allow
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.
To Next Page
Loading...
