Combines Cylinder fan speed sensor on F

Spacing could be a factor, mice could be a factor, a fuse if it runs all of those sensor could be the problem, or they might of just gone bad but not likely all of them. And you can still get them(expensive)! They can be tested with the proper equipment and they are magnetic pickups. Go to you Gleaner dealer and see if he will let you read or copy the pages from the Service Manual dealing with these sensors and give you more insight. Setting the ground speed gets into quite a process according to my service manual.

71357406 IS THE n MIGHT MODIFY A 71313444 TO WORK

I replaced just the sensors on my M2 and they worked fine after that. If you know of one sensor that is working you could try switching it with another just to see if it is the sensor or a wiring problem. I went through all the wires on my M2 and soldered broken wires, replaced badly chewed ones and taped all the rest. There really weren't that many bad but some wore through where the harnesses leave the cab. As far as the sensors go I noticed if they didn't work and they looked ok as far as gap and position, that they were just shot. Hope that helps, Curt

In my experience 90% are bad because the wire is broke exactly where it enters the plastic molding. I have salvaged a few by cutting back the molding and soldering the wire back.(where they are not chewed up by speed wheel or spkt))

Sounds like you may have a little project on your hands. First of all you have to ask yourself how bad you want_need them. They are nice to have working though, but not completely necessary. The next thing is like everyone else mentioned, $money$. First check the fuse, then make sure the tach itself works, usually one thing on it works, in most cases the engine rpm's or ground speed. I have seen the wires broke underneath them by the cylinder speed adjustment. If they are not broke_chewed_etc. then you can tie them together and make sure they are out of the way. Throw some moth balls in there for future insurance. Maybe start with one new sensor and go from there placing it on all places to see if the wires are broke between the tach and sensor. It may cost quite a bit, I don't remember off-hand. I do remember doing the simplified "tattle tale" warning system of the "F". The blinking red light and the 3 green. I fixed our machines many times and finally figured out better ways. For the door (concave) I just hooked a male and female end together and when the door falls down it disconnects them causing the green light to go out and the red to blink. Sometimes it would flicker and sometimes not work the original way no matter how I fixed it and so the only thing you have to do this way is connect it back together when the door is back up again (you have to get under there anyways!). The straw walkers sometimes work sometimes don't, I bought a simple door switch and placed it on the metal piece (behind the walkers and above the chopper) and it goes off when the switch is released. The parking brake I pretty much left the same and cleaned it really well. All of our lights now work! Back to the sensors though, they should be easy to find (one on the fan shaft, one off the transmission, one off the cylinder, and one off the engine flywheel. They are thin round pieces with rectrangles cut on the outsides and the magnetic pickup on one side. Sensors should be no more then 1_8" away but not touching!) let me know how things go.

we use a digital vom meter set on ohms. usally read around 420-500 ohms resistance if they are good enough to work. you can check them out without removing.