User:Jstapko/EngLab/Treadmill

Treadmill Repair

Introduction
I am working with Phi to repair a salvaged treadmill.

Work Done September 14

 * Took initial pictures of treadmill
 * Looked for information on parts
 * Found very little information on the motor
 * Found an Owner's Manual for the treadmill
 * Partially disassembled switch and took video of its internal workings
 * Took ohmmeter readings of the switch; Initial results suggest it is all completely shorted together, but need to re measure after disconnecting wires to rule out shunting effect of main winding on readings
 * looked very hard to see what the motor wires connected to internally; it looks like black is connected to a small wire only, can't really see red or yellow connections

Basic Specifications and Part Numbers

 * Mfr: Sears, Roebuck, and Co.
 * Model: 831.296480
 * serial: L 293447
 * date: could be 6/89, if thing below serial numbeer is a date code
 * Motor Mfr: General Electric
 * Motor Model Number: 5KH41 GT42
 * Switch Model Number: 100DT 8298 3ASM9A8A7 (suspect numbers in bold to be actual part number)

Conclusions

 * Think centrifugal switch is broken
 * can't tell exactly where we should apply power
 * motor is not thermally protected, so need to connect to circuit breaker
 * Think that black and red wires are start winding, yellow and red are main winding
 * after thinking about it, suspect motor pulley is actually for mechanical variable sepeed, which is not supposed to be adjusted with motor off.

Next Steps

 * disconnect main winding from switch and check continuity between terminals again
 * wire red and yellow wires to the line cord VIA THE CIRCUIT BREAKER because the motor is not thermally protected
 * when wired, power red and yellow wires and attempt to start it to spin motor by hand
 * keep looking for information on the motor
 * keep looking for information on the switch
 * keep looking for a service manual
 * lubricate axle about which motor frame pivots
 * try to figure out what sensor is for
 * look for bicycle cable lube for the speed control

Links

 * 1) Conversation about Maytag Neptune washer This tells us:
 * 2) Our motor is probably a washer motor or very similar to one (part number nearly matches that of link)
 * 3) Switch on back probably has laterally adjacent terminals connected together
 * 4) May have luck with terms like "Maytag Washer Motor" or "Maytag Washer Repair"
 * 5) Appliance Aid.comhas links to schematics of many brands and styles of washer. This may tell us something about how the circuits generally operate.
 * 6) Owner's Manual of the treadmill Includes parts list and assembly drawing, partial circuit descriptions.
 * 7) Photo of inside of switch very similar to the one on the motor (seems to be a double micro-switch)
 * 8) Page with photo of different types of cent. switches Type "T" is most similar to the treadmill's.