4020 John Deere

Ray Durham · Posted: Tue May 19, 2009 3:42 pm Post subject: 4020 John Deere

I own a 1964 John Deere 4020 (serial #21T85483). Fuel gauge quit working, so I sent it to Jerry Trcka at EverGreen Restoration to restore. Got it back still didn't work. Jerry suggested I get a new sending unit for the tank. I did, but still does not work. Now, Jerry is saying my gauge is a 0-30 ohm gauge and must be matched to a sending unit with this same ohm range. My mechanic says the new sending unit is a 0-300 ohm unit. I'm curious as to what other members of this list think about my situation.

nickg · Posted: Tue May 19, 2009 4:49 pm Post subject: Re: 4020 John Deere

I have a 67 4020 diesel. My fuel gauge hasnt worked since I got it and wanted to fix it so I went to deere got a gauge and a sending unit. Crappy thing still doesnt work and Ive tried everything. Re wired it made sure it was positivly grounded and everything. I read sum wear that deere had part numbers wrong on the gauges for a gas and a diesel gauge but dealership wont take it back and Im not spendin 80 bucks on another gauge so I just use my never failing trusty piece of dowl rod for a fuel gauge. Hope you have better luck than I did

Gerald J. · Guest Report to Moderator

Check the wires and the grounding of the old sending unit. On mine I was able to restore the old sending unit by bending the brass wiper a little so it touched the resistance coil again.

Fuel gauges have to match the sendor's resistance range or they will not work right.

Gerald J.

tim s · Posted: Tue May 19, 2009 5:34 pm Post subject: Re: 4020 John Deere

If your 4020 has standard 24 volt system it takes a RE 54427 positive ground gauge, and AR 26434 sender,,If it has been converted to 12 volt neg. ground you will need RE 53664 gauge and AR 26434 sender,,and the gauge holder will need modified to fit the new style gauge, the orange wire is the sender wire..and a ground wire needs to be run to the gauge..

buickanddeere · Posted: Wed May 20, 2009 7:37 am Post subject: Re: 4020 John Deere

Swapped polarity on 12V tractors and 24V to 12V conversions can render a fuel gauge useless unless properly re-wired.

4020_1966 · Posted: Wed May 20, 2009 7:50 am Post subject: Re: 4020 John Deere

When I did my 12v conversion (was the Deere kit) the manual said that the gauge may not work and listed part numbers if that happened. It worked perfectly so I have not had to mess with that. I guess some gauges and senders don't care if they are pos or neg grounded. They listed the same sender as Tim but AR 46271 (sub for AT 27153, R34262, and AR26716) for Fuel gauge as the "matched pair". They listed different #s for the newer 4020s.

Which btw if anyone wants a copy of the PDF file I scanned that has the conversion instructions with a copy of the wiring diagram for the <200999 "button" start 4020s let me know. The wiring diagram has some pencil scribbles on it from me troubleshooting some things and markign the "converted" electronics but it is easy to read the factory diagram thru them.

clearcreekaggie · New User Joined: 19 Jun 2010 Posts: 2 Report to Moderator

could you email me a copy of the 4020 wiring 12v conversion

crimson_w_livestock@hotmail.com

thanks

clearcreekaggie · New User Joined: 19 Jun 2010 Posts: 2 Report to Moderator

4020_1966 · Posted: Sun Jun 20, 2010 5:48 am Post subject: Re: 4020 John Deere

Yea I can get you the pdf, gimme a day or so and I can. Its to big for me to email out, I might be able to rescan it, that would save me some problems in the future. Which are you need it for? The early early or the early 4020? I can send the diagrams for either.