This IS NOT a guide for the do-it-yourselfer. These tips and suggestions are provided for persons with necessary test equipment and proper qualifications.

Before you start to work on the motor, MAKE SURE THE POWER IS OFF. Always turn the power off at the electrical service entrance breaker box or fuse, to prevent electrical shock. To prevent electrical shock when touching the motor, be sure windings are securely grounded to the ground terminal in accordance with local electrical codes. DO NOT work on electrical operations if water or moist operating conditions cannot be avoided.

Basic motor service requires just a few simple tools. To make the job go smoother, be sure to have these tools in your toolbox before you begin working:

1. Standard Screwdriver
2. Wide Blade Screwdriver
3. Rubber Mallet
4. Needle-nose Pliers
5. 5/16 inch Nut Driver
6. Ohmmeter
7. Voltmeter
8. Ammeter
9. Marking Pen

GENERAL MAINTENANCE

FAILURE TO START

(Motor makes no sound)
Electrical Checks

1. Check for blown line fuse.
2. Be sure switch and/or timer is in the "on" position.
3. Check all electrical connections to the terminal board located inside the conduit box on the motor.
4. Check continuity through thermal protector. (Allow motor to cool and try to restart)
5. Check windings for continuity.

(Motor hums or attempts to start)
Electrical Checks

1. Check for proper line voltage at the motor terminals. Voltage should be within +/- 10% of nameplate specification. If inadequate voltage is present, check for proper wire size or other causes of excessive voltage drop.
2. If equipped with a mechanical switch, the contacts should be in the closed position when at rest.
3. Check the capacitor.
4. Check continuity through thermal protector.
5. Check windings for continuity.

[Return to MENU]

MOTOR IS NOISY

Electrical Checks
Excessive electrical noise will occur in the event of high line voltage.

1. Check supply voltage at motor terminals.

Mechanical Checks
Excessive vibration.

1. Check for loose mounting.
2. Check shaft alignment.
3. Check for bent shaft.

Excessive noise.

1. Check for damaged or birnelled bearings. Replace as necessary.
2. Check for rotor rub by rotating the shaft slowly by hand.

[Return to MENU]

OVERHEATING

(Motor runs but overload trips)
Electrical Checks

1. Check for adequate ventilation. Be sure motor vent holes (or fan blades) are free of obstruction and ambient temperature does not exceed nameplate marking.
2. Check for proper supply voltage. Voltage should be with in +/- 10% of nameplate marking.
3. Compare running amps with the Maximum or Service Factor amps marked on the nameplate. If running amps are higher than nameplate, check for mechanical problems.
4. Check motor windings, capacitor and start switch for proper operation.

[Return to MENU]

SOLID STATE SWITCH

How to Check

1. Remove switch.
2. Visually inspect the switch for physical damage. All terminals should be straight up with good solder joints.
3. Checking for an open circuit.
   1. Set ohmmeter on R x 1.
   2. Connect leads to terminals 1 and 3.
   3. Meter should read short circuit.
   4. If not, replace switch with an exact replacement.
4. Checking for an short circuit.
   1. Set ohmmeter on R x 1.
   2. Connect leads to terminals 1 and 2.
   3. Meter should read open.
   4. If not, replace switch with an exact replacement.

If switch passes the above checks and the motor still does not start, it is possible the switch could be faulty. To absolutely discount the switch as your source of problem, perform the following bypass test.

1. Turn power off to motor.
2. Remove motor lead from terminal 2 on switch.
3. Connect a momentary contact switch between the removed lead from terminal 2 and terminal 1 on the switch.
4. Turn the power on and engage the momentary switch.
5. If the motor does not start, the motor is faulty. If the motor starts, replace the switch with an exact replacement.

[Return to MENU]