Farm Equipment - 8070 temp sending units

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8070 temp sending units

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=194622
Printed Date: 13 Nov 2025 at 12:25am
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Topic: 8070 temp sending units

Posted By: aaronac1
Subject: 8070 temp sending units
Date Posted: 15 Apr 2023 at 11:01am

Im having trouble with my temp gauge. Ive replaced the gauge and thr sending unit above the ac compressor. Online says there is two. I dont see thr other. Im assuming that the second one is bad and thats why its not working. Any help is appreciated

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Wd-45 D-17s4 170 185 190xt 7045 8070

Replies:

Posted By: ryan(IN)
Date Posted: 15 Apr 2023 at 11:27am

There is only one sender for the temp gauge. I don’t trust those factory gauges and always put another temp gauge in.

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ryan
1984 8070 FWA,1979 7060,1975 7040,1971 190,1960 D-17D,1957 D-14, 196? D-19G, 1975 5040,1971? 160,1994 R62

Posted By: captaindana
Date Posted: 15 Apr 2023 at 5:48pm

Yup I put in two in each tractor also.

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Blue Skies and Tail Winds
Dana

Posted By: Gleanermanl2
Date Posted: 15 Apr 2023 at 6:53pm

Have you tested the wire to the sender? Power to the gauge? Why do you say it doesnt work? If you turn the key on and ground the single wire that runs to the sender the gauge should peg the guage. Remove the wire from grounding and it should drop to cold. If it doesnt do that. test power to the guage. there should be 12 volts to one of the wires on the back. If there is 12 volts. ohm the sender wire. if all this checks out replace the sender. there is only one at the thermostat housing. (you can ohm the sender as well i just cant remember what the resistence is suppose to be at room temp) lastly the thermostats might be stuck open. i had a single thermostat stuck open and my temp gauge didnt come up at all.

Posted By: Unit3
Date Posted: 15 Apr 2023 at 8:00pm

When you turn the key the new temp gauge goes into the red and beyond. I have the same problem. Bought 2 new temp gauges. Also bought new senders for an 8070. My guy tells me that the new ones put out 11 volts to the sender and factory put out 5. They don’t have the right sender/gauge combo, yet.

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2-8070FWA PS/8050PS/7080/7045PS/200/D15-II/2-WD45/WD/3-WC/UC/C

Posted By: Gleanermanl2
Date Posted: 15 Apr 2023 at 8:30pm

Guages dont put out any voltage to the sender as far as I understand it. The sender is just a varying resistance to ground depending on the temp of the engine. it completes the circuit through the sender.

Posted By: Gleanermanl2
Date Posted: 15 Apr 2023 at 8:31pm

now i do know different guages use difference resistance sweep ranges to read accuratly. the range has to match the range the gauge will read. maybe thats what they meant.

Posted By: aaronac1
Date Posted: 15 Apr 2023 at 10:11pm

It ended up being a ground issue. I i made a jumper wire to for the gauge to go from the fuel gauge side to the temp side. All is right in the world

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Wd-45 D-17s4 170 185 190xt 7045 8070