Motor Brush Replacement - Graco ULTRA PLUS+ 750 Instructions-Parts List Manual

Motor Brush Replacement

NOTE: Replace the brushes when they have worn to
less than 1/2 in. Note that the brushes wear dif-
ferently on each side of the motor, so check them
both. Brush Repair Kit 220–853 is available. A
new spring clip, P/N 110–816 may be purchased
separately.
WARNING
INJECTION HAZARD
To reduce the risk of serious injury,
whenever you are instructed to relieve
pressure, follow the Pressure Relief
Procedure on page 8.
NOTE: Read the GENERAL REP AIR INFORMATION
on page 18 before doing this procedure.
1. Relieve pressure.
2. Remove the motor shield (59). Remove the in-
spection covers (J) and gaskets on each side of
the motor. See Fig. 12.
59
Fig. 12
3. Push in the spring clip to release its hooks from
the brush holder. Pull out the spring clip. See Fig.
13.
SPRING
Fig. 13
4. Loosen the brush lead terminal screw. Pull the
brush lead away, leaving the motor lead terminal in
place. Remove the brush and spring. See Fig. 15.
5. 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.
When installing the brushes, follow all steps carefully
to avoid damaging the parts.
6. Install a new brush so the lead is in the long slot of
the holder. See Fig. 14.
Fig. 14
7. Slide the terminal under the terminal screw washer
and tighten the screw. Be sure the motor lead is
still connected at the screw. See Fig. 15.
J
SPRING
BRUSH
HOOK
BRUSH
Fig. 15
SPRING CLIP
8. Place the spring on the brush as shown in Fig. 14.
P/N 110–816
9. Install the spring clip and push it down to hook the
short slots in the housing. See Fig. 14.
10. Repeat for the other side.
11. Test the brushes.
CAUTION
BRUSH HOLDER
SHORT SLOT
LONG SLOT
BRUSH
SPRING
CLIP
NOTE: SPRING MUST COIL
IN THIS DIRECTION
SPRING CLIP
BRUSH LEAD
TERMINAL SCREW
MOTOR LEAD
TERMINAL