Minuteman M2400 Electric Burnisher W_ Dust Control Option - Manual (Page 11)

Parts and Instruction Manual
Page 7
Model 2400 Burnisher Operating Instructions
Preventive Maintenance
1. Inspect motor carbon brushes approximately every 250 hours. A set of carbon brushes should
last as long as 2500 hours. Premature wear may indicate other problems with the motor.
These can be inspected by removing the motor cover. Indications for changing carbon brushes
would be if the indicator light comes on or if the carbon brushes are flush with or slightly
recessed in the brass brush holder.
2. Periodically clean the motor by removing the motor cover and blowing it out with compressed
air.
3. Check the drive belt of wear and proper tension. Retention the belt by loosening the four
motor mount screws, then apply force to the motor toward the rear of the machine. Take out
excessive slack. Do not overtighten the belt. This can cause excessive loads to the bearings
and reduce the belt life.
Trouble Shooting
1. Machine will not start.
A. Check to see if the machine circuit breaker is reset.
B. Check to see if there are any disconnected wires at the motor or switches.
C. Check to see if the “on/off” switch and safety switch are activating.
2. Motor will not start, circuit breaker trips.
A. Check rectifiers in the motor for damage.
B. Inspect internal wiring for loose connections or direct shorts.
C. Inspect carbon brushes for excessive wear.
3. Machine runs a short period of time, then the circuit breaker trips.
A. Check motor carbon brushes for wear.
B. Adjust pad pressure to the floor to relieve pad pressure.
C. Extension cord under size, pulling a low voltage.