8070 Transmission temp sensor

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   8070 PD transmission temp sensor false alarm.  Light is on all the time including when tranny is cold at startup.   Got new one from AGCO.  Old sensor has one green wire running to it.  New one has two tabs for wires.  One marked G and the other with an R.    Is there supposed to be two wires attached to this?   Can only find one green wire.   The other wire in the harness goes to the hydraulic restriction sensor.  Another question: Is the cap on the hydraulic fill tube supposed to be venting.  I can't find a vent anywhere for either the hydraulic reservoir or the transmission.  My main use of tractor is seeding where it powers hydraulic powered fan.   The hydraulic restriction comes on them goes out after a while.

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ajl Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 31 Dec 2009 Location: Alberta Points: 115	Post Options Post Reply Quote ajl Report Post Thanks(0) Quote Reply Topic: 8070 Transmission temp sensor Posted: 03 Jun 2022 at 6:00pm
	8070 PD transmission temp sensor false alarm. Light is on all the time including when tranny is cold at startup. Got new one from AGCO. Old sensor has one green wire running to it. New one has two tabs for wires. One marked G and the other with an R. Is there supposed to be two wires attached to this? Can only find one green wire. The other wire in the harness goes to the hydraulic restriction sensor. Another question: Is the cap on the hydraulic fill tube supposed to be venting. I can't find a vent anywhere for either the hydraulic reservoir or the transmission. My main use of tractor is seeding where it powers hydraulic powered fan. The hydraulic restriction comes on them goes out after a while.

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darrel in ND Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 22 Nov 2009 Location: Hebron, ND Points: 8715	Post Options Post Reply Quote darrel in ND Report Post Thanks(0) Quote Reply Posted: 04 Jun 2022 at 8:55am
	Yes, the cap (one on top of rear housing, with ring on it) is a vent cap Darrel

SteveM C/IL Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Shelbyville IL Points: 8612	Post Options Post Reply Quote SteveM C/IL Report Post Thanks(0) Quote Reply Posted: 04 Jun 2022 at 9:19am
	Get a tiny link chain at hardware store and zip tie that fill cap to a remote cable so you don't drive off and lose it like I did. Salvage yards didn't seem to have one. REALLY? Was over $100 couple years ago from AGCO. One of those wires is likely a ground. I think when the sensor grounds out it turns light on? In past people have had light issues for other functions and it wire had rubbed through and was grounding causing light to come on. I have a HYD filter light intermittent and can find no reason. New filters etc. Wondered about changing sender but .... Edited by SteveM C/IL - 04 Jun 2022 at 9:26am