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SteveM C/IL 
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 7980
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 Topic: 8070 warning light
Posted: 08 Dec 2019 at 9:48pm |
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PD 2wd. The light for hyd pressure comes on randomly. Changed both rearend filters to no avail. Things work fine just the light issue. Got to looking and the wire from sending unit above rt rr filter goes fwd to 2 spade sender(trans temp?). The other spade appears to have the wire broke off and not visible anywhere. Guessing need to swing batteries out and maybe try to find other end? Wiring diagram hard to follow. Do both of these senders use same wire? I'm not sure what I'm dealing with. Any help appreciated. Would like to have things right.
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Lynn Marshall
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Joined: 13 Sep 2009
Location: Dana, Iowa
Points: 2146
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Posted: 09 Dec 2019 at 8:43am |
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There is no hydraulic pressure light. There is a hydraulic filter light, right side ,at the filter housing. Transmission temp, right side,screwed into the transmission case. It has only one wire ,but the sender does have two terminals. It will only go on one way. There is also a transmission pressure light above 1800 RPM. On your tractor, the sending unit is at the filter base under the radiator area.
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SteveM C/IL
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 7980
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Posted: 09 Dec 2019 at 12:05pm |
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Right,it is hyd filter light not pressure. It's the one above right rear end filter I believe. It has a wire going fwd to the 2 spade plug. If there is not a wire connected to the second spade,how can this do anything? Basically these two sensors and connected to each other with one wire and nothing else. That can't be right? The 1800 rpm light works as it should.
Edited by SteveM C/IL - 09 Dec 2019 at 12:06pm
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Lynn Marshall
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Location: Dana, Iowa
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Posted: 09 Dec 2019 at 5:26pm |
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Thd hydraulic filter light uses a purple with white stripe wire. The transmission temp light uses a light blue with white stripe wire. This information is in the back of the owners manual if you have one. I believe that they do run together in a short leg of the main chassis harness.
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SteveM C/IL
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 7980
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Posted: 09 Dec 2019 at 6:33pm |
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Well,there's something fishy going on cause my book does not show those 2 senders connected in any way but mine has a purplish wire which has round end that pushes on stud of hyd filter sender then going fwd to the 2 spade connector(temp sender). The 2 spade plug appears to have a broken off wire in the other position. Will have to start at dash and work backwards. Not now though. Combine needs some attention.
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Lynn Marshall
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Location: Dana, Iowa
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Posted: 09 Dec 2019 at 9:41pm |
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The two spade transmission temperature sending unit only uses the one spade. There is no other wire to it.
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SteveM C/IL
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Location: Shelbyville IL
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Posted: 09 Dec 2019 at 10:17pm |
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HMMMM Hope to sort it out before spring. I'll probably bug you some more when time comes.
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victoryallis
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Joined: 15 Apr 2010
Location: Ludington mi
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Posted: 10 Dec 2019 at 7:56am |
 Lynn Marshall wrote:
There is no hydraulic pressure light. There is a hydraulic filter light, right side ,at the filter housing. Transmission temp, right side,screwed into the transmission case. It has only one wire ,but the sender does have two terminals. It will only go on one way. There is also a transmission pressure light above 1800 RPM. On your tractor, the sending unit is at the filter base under the radiator area. |
The filter at the rear of the tractor?
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8030 and 8050MFWD, 7580, 3 6080's, 160, 7060, 175, heirloom D17, Deere 8760
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Lynn Marshall
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Joined: 13 Sep 2009
Location: Dana, Iowa
Points: 2146
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Posted: 10 Dec 2019 at 12:57pm |
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The filter at the rear on some tractors is for the power shift transmission. It does also have a sender for the filter if it is restricted. Again , this is for the transmission and not the hydraulics.
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