Sherwin-Williams ULTIMATE NOVA 1000 Service Manual download pdf (Page 22)

NOTE:

Replace the brushes when they have worn

to no less than l/2” minimum. See Fig 11.

Note that the brushes wear differently on

each side of the motor. Brush Repair Kit

620-521 is available.

Before doing this procedure, follow the Pressure

Relief Procedure Warning on page 13 to reduce

parts or electric shock. Unplug the sprayer1

Remove the motor cover (14). See Fig 10.

Remove the screws (l-i), inspection covers (J) and

gaskets (K) on each side of the motor. See Fig 10.

Push down and then in on the spring clip, and then

pull the clip out of the brush holder. Refer to STEP

3, Fig 11. Keep the spring clip.

Loosen the brush terminal screw and remove the

lead.

Remove and discard the brush.

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 be wearing too fast.

Place a new brush in the holder so the lead is at the

top of the holder. Place the brush lead terminal on

the terminal screw so the terminal is parallel with

the brush holder. Tighten the terminal screw. See

STEP 1, Fig 11.

With the spring roll touching the brush, push the

forked end of the spring clip into the brush holder.

See STEP 2, Fig 11. When the fork passes through

the end of the holder, push the clip up or down until

the fork hooks at the end of the holder. See STEP

3, Fig 11.

Position the brush lead as in STEP 3, Fig 11. Be

sure the brush lead does not touch any part of the

armature or motor housing.

10. Test the brushes:

With the ON/OFF switch OFF, turn the

pressure control knob all the way counterclock-

wise to minimum pressure. Plug in the sprayer.

Turn the ON/OFF switch ON and slowly in-

crease the pressure until the motor comes up to

full speed.

Inspect the brush and commutator contact area

for excessive arcing. Arcs should not “trail” or

circle around the commutator surface.

WARNING

Do not touch the brushes, leads, springs or brush

holders while the sprayer is plugged in to avoid

electric shock and possible serious bodily injury.

damaging the displacement pump.

FAN COVER

Fig 10

STEP 1

\ .

Fig

11. Reinstall the brush inspection covers, gaskets, and

screws. Reinstall the motor cover and screws.

SCREW

STEP 3

FORK MUST HOOK

HOLDER WHEN INSTALLING

TO REMOVE BRUSH

PUSH DOWN AND IN.

THEN PULL OUT

SPRING CLIP.

22 620-047

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Sherwin-Williams ULTIMATE NOVA 1000 Service Manual Page 22

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