Motor - J&J Amusements 24v 1750 rpm Service Manual

3-11

MOTOR

General Information ...........................................................3-11
Motor Disassembly .............................................................3-12
The high-effi ciency, brush-type, permanent magnet motor seldom has problems.
MOST COMMON PROBLEMS:
Symptom: The motor will not turn when the actuating rod is in the "ON" position.
Most common cause: The motor circuit is open. Measure the voltage going into the motor from the main motor positive
post (white wire), and measure the voltage going out of the motor (black wire). If voltage is present at the white wire, but
not at the black wire, then the circuit inside the motor is open. Worn brushes are a common cause of this symptom.
Solutions: Remove and inspect the brushes, replacing with new brushes and springs as needed.
Symptom: The motor turns very slowly, and the connections get hot.
Most common cause: The motor is drawing too many amps and may cause the 50 amp safety/breaker to trip. Normally
this is caused by mechanical issues with the drive system and/or motor bearings, resultant armature drag, etc.
Solutions: Check the propeller for foreign objects wrapped up in the shaft/propeller. Check the gear box for wear or seized
shafts, bearings, etc. Replace as needed.
phone: 1-800-854-3140 | 1-503-304-8899 fax: 1-800-366-7505 | 1-503-304-1899 www.jjamusements.com