CIH 1660 rotor and fan speeds - 2

Dave H (MI)

Well-known Member
Replies on prior post much appreciated! I now have the fan speed adjustment working just fine. I fixed the wiring to the adjusting motor and cleaned and used some silicon on the threads. It works very well now.

I was up on top of the combine before dinner and noticed the previously mentioned threads were now visible on the rotor speed adjustment. I sprayed these down and will let them soak. They look clean though. I will get after them again tomorrow with a small brush and more spray.

There are two wires from the harness that connect in this area. Kind of dark in there so I need to get a work light and see if I can get up close to them These wires attach literally a couple inches away from the drive shaft and the threads. I suspect one of them is shorting and creating a spark. I need to address this. Would anyone know what these wires are for? I don't think that they are for the motor. I believe the motor connections are above all this by a good 10". There are what appear to be two switches in that are on either side of the large chain sprocket. Looks like rollers on the end that contact the sprocket? I won't swear to these being switches but I have these two wires and it would be good to know what the wires do. So after all that...anyone know what these two wires are for?
 
Okay now we are getting somewhere.

Those two switches are limit switches so you don't open or close the pulley two wide and allow the belt to get caught in the center of the pulleys and ruin a belt.

If a wire is sparking to these switches then it would stop the adjusting motor because the circuit would be open.

About the speed at which it changes rotor speed.

If it was changing 10 rpm at an idle when you would have the engine up to full speed and change the speed it would be about 50 rpm every 10 seconds.

Those motors have a built in overload and will stop when over loaded then reset in a few seconds and turn again.

Do not grease those threads that the sprocket turns on. Yes they need to be clean but grease will collect dirt and make it worse. Just grease the zerks where and when you are suppose to and all will work fine. Leave those threads dry but clean. On 4 different rotor machines I have never had to clean those threads.

Gary
 
Thanks Gary! That was my perception of what the switches were for. The sparks come often enough that it could be cutting out the motor or causing erratic action. Sounds like I just need to get a work light up in there and a step ladder to get me close enough that I can see it and inspect those wires with the combine off. See if I have another connection going bad like on the fan.

I'll spray down the threads with a zero residue cleaner. They are quite clean as they were inside the casting when I started. Likely they just need to be run in and out a couple times.

Appreciate your help and all the others also!
 
Wow...you guys are rock stars! Pointed me to the right places and I found my problems there. Both fan AND rotor speed controls are working now. The sparking on the rotor was from the limiter switch toward the front of the combine. The back wire was held down by a screw that was too long and a 1/4" nut had been put under the connector as a spacer but the wire was still loose. Vibration of the machine caused breaks in contact and sparks. I added a washer and lock washer and the screw snugged down over the connector. Sparks are gone. Rocker works now to adjust speed. Threads move smoothly. Motor shuts off when run up against switches as it should.

Many thanks!
 

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