john deere 4230 cab blower

[CRFarm]

I have a 4230 that had one of the cab blower motors go bad. I put in a new motor. Both motors are the 2 wire motors. I only have the low speed and no hi speed. The books show a resistor mounted on the right side of one of the motors and my dealer said that is the problem. I opened the roof everywhere and can not find the resistor. Could the resistor be built inside the blower switch? There is none on the outside of the switch. Any help?

 

[Bob]

Your parts guy is mixed up.

The older system with two blowers did NOT use a resistor. (The newer system used on later tractors and replacement cabs for older tractors with ONE blower did.)

You may have a bad circuit breaker, a wiring/ground problem or a bad fan switch. (The switch connects the motors in SERIES for "low" and PARALLEL for "high".)

 

[tim s]

That's right Bob, a lot of 'good' blower motors get tossed because of a bad switch, the new replacement 'stack' switches are ornery for a novice to figure out. Most parts guys weren't even born yet when those early 30's came out. I have always thought that a new parts guy should do a 'tour of duty' in the shop before starting at the counter.

 

[CRFarm]

Thanks Bob. Once you told me about the parallel and series, that made sense. I had 2 wires reversed. Very hard to figure out. I never thought about using the resistance of the motors them selfs to get the resistance to run them on the slow speed. Thanks a bunch. Gust like most of the time, the mechanic at the dealer didn,t know what he was talking about. Guess he gust thought I would pay him to fix it. WRONG

 

[Bob]

GREAT! Glad you able to hang onto some bucks and get it fixed yourself!

 

[Anonymous-0]

yes this is a mess can you help me with the same problem. why cant they just make the same switch? mine had worked for 38 years. what was wrong with that design?