Motor Brush Replacement - Graco A Series Instructions-Parts List Manual

NOTE: Replace the brushes when they have worn to
less than 1/2 in. See STEP 1, Fig 25–3. Note that
the brushes wear differently on each side of the
motor, so check them both. Brush Repair Kit
220–853 is available.
WARNING
Before doing this procedure, follow the
Relief Procedure W arning on page 24 to reduce
the risk of a fluid injection injury , splashing in the
eyes or on the skin, injury from moving parts, or
electric shock. Unplug the sprayer!
1. Remove the motor cover (14) and screws (64). Re-
move the screws (H), inspection covers (J) and gas-
kets (K) on each side of the motor. See Fig 25–1.
14
Fig 25–1
2. Push in the spring clip to release its hooks from the
brush holder. Pull out the spring clip. See Fig 25–2.
3. Loosen the brush lead terminal screw. Pull the brush
lead away, being careful to ensure the motor lead ter-
minal remains in place. Remove and discard the
brush and spring. See Fig 25–3.
4. Inspect the commutator for excessive pitting, burn-
ing or gouging.
NOTE: 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.
5. Repeat for the other side.
CAUTION
When installing the brushes, follow all steps care-
fully. Improper installation damages parts beyond
use.
6. Place a new brush in the holder so the lead is in the
long slot of the holder . Slide the terminal under the
terminal screw washer. Make sure the motor lead is
still connected the at the screw. See Fig 25–4.
7. Place the spring on the brush as shown in Fig 25–4.
If the spring is installed backwards, it will be dam-
aged when the spring clip is installed.
8. Install the spring clip and push it down until its hooks
catch the short slots in the housing. See Fig 25–4. In-
correct installation may jam the clip.
9. Repeat for the other side.

MOTOR BRUSH REPLACEMENT

Pressure
64
H
J,K
SPRING
Fig 25–2
SPRING
BRUSH
Fig 25–3
NOTE: SPRING MUST COIL
IN THIS DIRECTION
Fig 25–4
10. Test the brushes.
a. With the ON/OFF switch OFF, turn the pressure
control knob fully counterclockwise to minimum
pressure. Plug in the sprayer.
b. Turn the ON/OFF switch ON. Slowly increase
the pressure until the motor comes up to full
speed.
c. Inspect the brush and commutator contact area
for excessive arcing. Arcs should not "trail" or cir-
cle around the commutator surface.
WARNING
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.
CAUTION
Do not run the sprayer dry for more than 30 sec-
onds while checking the brushes to avoid damag-
ing the displacement pump.
11. Reinstall the brush inspection covers, gaskets, and
screws. Reinstall the motor cover
washers.
HOOK
BRUSH
SPRING CLIP
SPRING CLIP
BRUSH LEAD
TERMINAL SCREW
MOTOR LEAD
TERMINAL
BRUSH HOLDER
SHORT SLOT
LONG SLOT
BRUSH
SPRING
CLIP
, screws and
307–958