Troubleshooting

Problem

What to Check

How to check

 

 

 

Basic electrical problems

Motor leads are securely fastened

Replace loose terminals; crimp to

 

and properly mated

leads. Be sure terminal are firmly

 

 

connected.

 

 

Clean circuit board terminals.

 

 

Securely reconnect leads.

 

 

 

 

For loose motor brush lead

Tighten terminal screws. Replace

 

connections and terminals.

brushes if leads are damaged.

 

 

 

 

Brushes must be 1/2 in. [13mm]

Replace brushes.

 

minimum. NOTE: Brushes do not

 

 

wear at the same rate on both sides

 

 

of motor. Check both brushes.

 

 

 

 

 

Broken or misaligned motor brush

Replace spring if broken. Realign

 

springs. Rolled portion of spring must

spring with brush.

 

rest squarely on top of brush.

 

 

 

 

 

Motor brushes may be binding in

Clean brush holders. Remove carbon

 

brush holders.

with small cleaning brush. Align brush

 

 

leads with slot in brush holder to

 

 

assure free vertical brush movement.

 

 

 

 

Motor armature commutator for burn

Remove motor and have motor shop

 

spots, gouges or extreme roughness.

resurface commutator if possible.

 

 

 

38

334466A

Page 38
Image 38
Graco 334466A Basic electrical problems, Replace loose terminals crimp to, Motor. Check both brushes, Brush holders