Graco LP 555 Operation - Repair - Parts page 35

Problem
Basic electrical problems
3A4203B
What to Check
Motor leads are securely fastened
and properly mated
For loose motor brush lead
connections and terminals.
Brushes must be 1/2 in. [13mm]
minimum. NOTE: Brushes do not
wear at the same rate on both sides
of motor. Check both brushes.
Broken or misaligned motor brush
springs. Rolled portion of spring must
rest squarely on top of brush.
Motor brushes may be binding in
brush holders.
Motor armature commutator for burn
spots, gouges or extreme roughness.
Troubleshooting
How to check
Replace loose terminals; crimp to
leads. Be sure terminal are firmly
connected.
Clean circuit board terminals.
Securely reconnect leads.
Tighten terminal screws. Replace
brushes if leads are damaged.
Replace brushes.
Replace spring if broken. Realign
spring with brush.
Clean brush holders. Remove carbon
with small cleaning brush. Align brush
leads with slot in brush holder to
assure free vertical brush movement.
Remove motor and have motor shop
resurface commutator if possible.
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