4240 transmission light

LEON TURLINGTON · Jun 16, 2017

4240 transmission light comes on and goes off intermittently. Changed transmission oil and filter, cleaned sump screen and light didn't come on at all for about 10 hours. Then it came back with a vengeance. Now it will flicker, stay on, go off, come back on and it does not matter what the engine speed or which transmission gear range and gear I use. Is this a problem with the transmission, transmission pump, electrical wiring or? It is a quad range transmission, the tractor has about 5000 hours on it, the hi-lo clutch packs on the 1-2 range were replaced at the 2000 hour range. Leon

Old Farmall Fan · Jun 16, 2017

I am assuming that this light indicates a overheating condition? If so, first thing to do is to get a temp gun and determine if the transmission is actual overheating. My 4250 was showing a hydraulic high temp light and I was able to determine that the sensor was faulty, no problem with the tractor at all. Good luck.

Tx Jim · Jun 17, 2017

Possible faulty sensor. I's suggest to check pressure.

gostate · Jun 23, 2017

We had a similar problem on our 4230. Checked pressures and they were ok. To isolate the problem we switched the sensor with the one on our 4240. result was that both tractors work fine now. We think we had a rusty wire connection on the 4230 that was making the transmission light flicker.

Hay maker2 · Jun 23, 2017

Look for the pressure sensor on the oil filter relief valve housing, item #14 (part #RE14191) in the attached picture. This is located to the rear of the hydraulic filter.

Be carful as they break real easy! You will see 2 wires coming off of this, one wire to frame and the other wire to the idiot light. Make sure both wires are in good working order. Remove the wire that goes to the light and take it to the frame (the wire that goes to the light), the light should come on and stay on. This will determine if the wire from the relief housing to the light is good or bad.

Confirm that the wire from the sensor to the frame is tight and has a clean connection.

With a multi-meter, set it to continuity. With the tractor off there should be no continuity between the two wires on the pressure switch. With the tractor running there should be continuity between the two wires if the switch is good and if the pump is pumping enough oil to change the state of the pressure switch.

Bestweld · Jul 16, 2023

(quoted from post at 15:17:41 06/23/17) Look for the pressure sensor on the oil filter relief valve housing, item #14 (part #RE14191) in the attached picture. This is located to the rear of the hydraulic filter.

Be carful as they break real easy! You will see 2 wires coming off of this, one wire to frame and the other wire to the idiot light. Make sure both wires are in good working order. Remove the wire that goes to the light and take it to the frame (the wire that goes to the light), the light should come on and stay on. This will determine if the wire from the relief housing to the light is good or bad.

Confirm that the wire from the sensor to the frame is tight and has a clean connection.
[color=red:e7dc734e62]
With a multi-meter, set it to continuity. With the tractor off there should be no continuity between the two wires on the pressure switch. With the tractor running there should be continuity between the two wires[/color:e7dc734e62] if the switch is good and if the pump is pumping enough oil to change the state of the pressure switch.

Hello, I realize the thread is old, but I am trying to revive a 4230 that has been setting for sometime and has several issues that I will start a thread on but, can someone confirm if the statement in red is true? I would think the pressure switch (AR619070, RE14191) should be normally closed.

Mine is open with the tractor off. One wire is broken off but I can still see enough to put a meter on it.

4240 transmission light

LEON TURLINGTON

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Old Farmall Fan

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Tx Jim

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gostate

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Hay maker2

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Bestweld

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