Hello All:
The 3360 I have picked up showed no life when on a track or when I directly placed leads on the pickup rollers and one of the wheels for ground. I took apart the motor and the brushes were good, springs intact, cleaned the armature and checked it with an ohm meter. Good continuity and 1.3 ohms between all three sectors. Wires to motor all appear connected and I found a bushing along with a ball bearing for the bushing plate as I reassembled it. It doesn't appear abused or overheated. The armature moves free.
Now when I apply leads to one of the brushes (the one where the small coil wire is not attached) and ground to the frame of the motor I still get no life, no hum, nothing. What am I missing? I'm considering unsoldering the wire connections to the motor and removing the motor frame to access and check the wire connections on the reversing switch below. Its just that all that fine soldering of the small coil wires may be above my pay grade.
Any suggestions on bench tesitng the motor would be appreciated. The book says this is a double coil motor. Does this make a difference?
The crane has a double wound field. One field is for one direction of the motor, and the other field is for the reverse direction.
Here is the schematic for the crane.
Following the schematic, connect one brush to one field winding. Take one transformer lead and connect it to the motor case (ground). Take a jumper wire and connect one end to one brush, and the other end to one end of one coil. The other transformer lead goes to the other brush.
Apply power, and the motor should run. Take the jumper wire off the one coil lead and attach it to the other coil lead. Apply power, and the motor should run in the opposite direction.
Larry
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