National Flooring Equipment 550, Instruction Manual, Page: 17 / 28

Troubleshooting Guide
Problem Cause Soulution
There is no power Insuffi cient power Inspect the electrical cord for damage.
Switch/Circuit Check switch and/or if the circuit breaker is
tripped.
Motor Noise Fan guard is malfunctioning Make sure the fan guard is not bent.
Machine is hard to handle Machine is too heavy Remove the counterweight.
Blade is too large Try changing to a smaller blade size.
Blade is too dull Remove blade and sharpen before reattach-
ing.
Blows fuses or circuit breakers. Power Cord Check and/or change attached power cord.
Use a 12 gauge or heavier cord, 50’ or less.
Poor quality outlet Move to a different outlet or better circuit.
Rattling Loose fasteners Check for loose nuts and bolts and re-tighten.
Shank Insertion Shank holder If it is diffi cult to insert a shank into the holder,
remove the paint from the shaft of the shank
by using sandpaper, emery cloth or a solvent.
www.nationalequipment.com Phone: 763-315-5300 17