Motor Brush Replacement
NOTE: Replace the brushes when they have worn to less than 10 mm. See Fig. 12. Always replace both brushes at the same time. A Brush Repair Kit, 220±853, and spring clip, 110±816, are available.
NOTE: Replacement brushes may last only half as long as the original ones. To maximum brush life, break in new brushes by operating the sprayer with no load (remove the pump connecting rod pin) for at least one hour.
A
01745C
Fig. 10
WARNING
INJECTION HAZARD
To reduce the risk of serious bodily injury, follow the Pressure Relief Proce- dure Warning on page 11 before check-
9.Test the brushes. Remove the connecting rod pin (50). See 15, page 14. With the sprayer off, turn the pressure control knob fully counterclockwise to minimum pressure. Plug in the sprayer. Turn the sprayer on. Slowly increase the pressure until the motor is at full speed. Inspect the brush and commutator contact area for excessive arcing. Arcs should not ªtrailº or circle around the commu- tator surface.
CAUTION
Do not touch the brushes, leads, springs or brush holders while the sprayer is plugged in, to reduce the risk of electric shock and serious bodily injury.
10.Install the brush inspection plates, gaskets and covers.
11.Break in the brushes. Operate the sprayer for at least one hour with no load. Then reinstall the connecting rod pin (50).
2
| B |
| |
1 | Order part |
| |
no. 110±816 | C | ||
| |||
| Hook of spring clip | ||
2 |
|
D 1
Fig. 11 | 01227 |
ing or repairing any part of the spray system.
1. | Remove both inspection covers (A). See Fig. 10. |
2. | Push in the spring clip (E) to unhook it, and then |
| pull it out. See Fig. 11. |
B
C
D
3. Loosen the terminal screw (F). Pull the brush lead |
(E) away, leaving the motor lead (G) in place. |
1
| Remove the brush (C) and spring (B). See Fig. 12. |
4. | Inspect the commutator for excessive pitting, |
| burning or gouging. A black color on the commuta- |
| tor is normal. Have the commutator resurfaced by |
| a qualified motor repair shop if the brushes seem |
| to wear too fast. |
5. | Install the new brush (C) so its lead is in the long |
| slot (H) of the holder. See Fig. 13. Slide the termi- |
| nal (E) under the terminal screw washer. Make |
| sure the motor lead (G) is still connected the at the |
| screw. Tighten the screw (F). See Fig. 12. |
6. | Place the spring (B) on the brush as shown in Fig. |
| 13. The spring must coil as shown. |
7. | Push in and hook the spring clip (D). See Fig. 13. |
8. | Repeat for the other side. |
1 10 mm minimum
Fig. 12
Spring
1 must coil in this direction
E
F
G 01227
H
B1
C
D
Fig. 13
1