Graco 231-081, Instructions And Parts List

25

307–920

MOTOR BRUSH REPLACEMENT

NOTE:

Replace the brushes when they have worn to

less than 1/2 in. See STEP 1, Fig 13. Note that

the brushes wear differently on each side of the

motor, so check them both. Brush Repair Kit

220–853 is available.

Before doing this procedure, follow the 

Pressure

Relief Procedure Warning 

on page 23 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!

WARNING

1. Remove the motor shield (14). Remove the inspec-

tion covers (J) and gaskets (K) on each side of the

motor. See Fig 11.

14

J,K

Fig 11

2. Push in the spring clip to release its hooks from the

brush holder. Pull out the spring clip. See Fig 12.

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 13.

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 14.

7. Place the spring on the brush as shown in Fig 14. If

the spring is installed backwards, it will be damaged

when the spring clip is installed.

8. Install the spring clip and push it down until the hooks

catch the short slots in the housing. See Fig 14. In-

correct installation may jam the clip.

9. Repeat for the other side.

BRUSH

Fig 12

SPRING

BRUSH LEAD

TERMINAL SCREW

MOTOR LEAD 

TERMINAL

SPRING CLIP

HOOK

Fig 14

BRUSH

SHORT SLOT

LONG SLOT

BRUSH HOLDER

NOTE: SPRING MUST COIL 

IN THIS DIRECTION

Fig 13

SPRING

CLIP

BRUSH

SPRING CLIP

SPRING

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.

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.

WARNING

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 motor shield, brush inspection  covers

and gaskets.