Motor Brush Replacement - Graco ULTRA 500 Instructions-Parts List Manual

Motor Brush Replacement

NOTE: Replace the brushes when they have worn to
less than 12 mm (1/2 in). Note that the brushes
wear dif ferently on each side of the motor , so
check them both. Brush Repair Kit 222–157 is
available. A new spring clip, P/N 1 10–816 may
be purchased separately.
WARNING
INJECTION HAZARD
To reduce the risk of serious injury,
follow the illustrated Pressure Relief
Procedure warning on page 12 when-
ever you are instructed to relieve pressure.
NOTE: Read the GENERAL REP AIR INFORMATION
on page 18 before doing this procedure.
1. Relieve pressure.
2. Remove the motor shield (1). Remove the inspec-
tion covers (J) and gaskets on each side of the
motor. See Fig. 11.
1
Fig. 11
3. Push in the spring clip to release its hooks from
the brush holder. Pull out the spring clip. See Fig.
12.
SPRING
Fig. 12
4. Loosen the brush lead terminal screw. Pull the
brush lead away, leaving the motor lead terminal in
place. Remove brush and spring. See Fig. 14.
J
HOOK
BRUSH
SPRING CLIP
P/N 110–816
5. Inspect the commutator for excessive pitting, burn-
ing or gouging. A black color on the commutator is
normal. Have the commutator resurfaced by a
qualified motor repair shop if the brushes seem to
wear too fast.
CAUTION
When installing the brushes, follow all steps care-
fully to avoid damaging the parts.
6. Install a new brush so the lead is in the long slot of
the holder. See Fig. 13.
NOTE: SPRING MUST COIL
IN THIS DIRECTION
Fig. 13
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. 14.
SPRING
BRUSH
Fig. 14
8. Place the spring on the brush as shown in Fig. 13.
9. Install the spring clip and push it down to hook the
short slots in the housing. See Fig. 13.
10. Repeat for the other side.
BRUSH HOLDER
SHORT SLOT
LONG SLOT
BRUSH
SPRING
CLIP
SPRING CLIP
BRUSH LEAD
TERMINAL SCREW
MOTOR LEAD
TERMINAL