Sherwin-Williams ULTIMATE 824-032 - Manual (Page 13)

824-033 13
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Motor Brush Replacement
WARNING
ELECTRIC SHOCK HAZARD
To reduce the risk of Electric Shock: wait
5 minutes after turning sprayer off before
servicing to allow stored current to dis-
charge.
NOTE: Replace the brushes when they have worn to
less than 0.4 in. See Fig. 10. Always replace both
brushes at the same time. A Brush Repair Kit, p/n
220–853, and spring clip, p/n 110–816, are available.
NOTE: To maximize replacement brush life, break in new
brushes by operating the sprayer with no load for at least
one hour. To operate with no load, remove the pump
connecting rod pin.
WARNING
INJECTION HAZARD
To reduce the risk of serious injury,
whenever you are instructed to relieve
pressure, follow the Pressure Relief
Procedure on page 7.
07391A
Fig. 8
A
14
1. Remove motor cover (14) and both inspection
covers (A). See Fig. 8.
2. Push in spring clip (D) to unhook, and then pull
out. See Fig. 9.
3. Loosen terminal screw (F). Pull brush lead (E)
away, leaving motor lead (G) in place. Remove
brush (C) and spring (B). See Fig. 10.
4. Inspect commutator for excessive pitting, burning
or gouging. A black color on commutator is normal.
Have commutator resurfaced by qualified motor
repair shop if brushes seem to wear too fast.
5. Install new brush (C) so lead is in long slot (H) of
holder. See Fig. 11. Slide the terminal (E) under
the terminal screw washer. Make sure motor
lead (G) is still connected the at screw. Tighten
screw (F). See Fig. 10.
6. Place spring (B) on brush as shown in Fig. 11.
Spring must coil as shown.
7. Push in and hook spring clip (D). See Fig. 11.
8. Repeat for other side.
9. Test brushes. Remove connecting rod pin (20).
See Fig. 13, page 15. With sprayer off, turn pres-
sure control knob fully counterclockwise to mini-
mum pressure. Plug in sprayer. Turn sprayer on.
Slowly increase pressure until motor is at full
speed. Inspect brush and commutator contact
area for excessive arcing. Arcs should not “trail” or
circle around commutator 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 brush inspection plates, gaskets, and cov-
ers.
11. Break in brushes. Operate sprayer for at least one
hour with no load. Then reinstall connecting rod
pin (20).