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JD 4020 Good/Bad ?

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Steve

04-09-2001 05:30:19

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Long story short, neighbor dies owes me some $$$ for hay. He owned a 4020 Gas Syncro, '66 model. It only has 3,000 hrs, original. Widow is willing to knock off the $$ owed on the local dealers appraisal. I am looking for a choring tractor (pulling sprayer, running augers, raking hay, grinding feed etc.) What are the advantages/disadvantages ? I can buy a few gallons of gas for the difference on this gasser vs diesel. I have heard rumors Deere gas engines were not all that great are they true ? What should I look for. It has the square aluminum carb on it, one 12 volt battery, alternator Not generator. It cranks over ok but no firing. It was running when it was shut off last, been sitting for 6 months. Opinions ? Got to make a decision here within the week or it will go to an auction house.

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Green Envy

04-10-2001 16:14:45

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Re: JD 4020 Good/Bad ? in reply to Steve, 04-09-2001 05:30:19

We had a early 4020 with a diesel and a powershift transmission. It was a good tractor out in the field but as soon as we put a loader on it, we started to have problems with the rear end and the transmission. I quess you have to kinda expect that after 8,000 hours. My relative in Indania has a 4020 gas. When we were there 3 summers ago, it seemed to run pretty good.

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Terry Weivoda

04-10-2001 04:25:58

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Re: JD 4020 Good/Bad ? in reply to Steve, 04-09-2001 05:30:19

I owned a 66 4020 gas and thought it was a good tractor. Gasoline consumption is an issue especially with projection of higher prices this summer. But if you use the tractor for mainly light work the difference between the diesel and the gasoline engine is less. In my area the gas 3020s and 4020s run about $2000 less than their diesel counterparts (comparing the same condition). I think one of the advantages is that because they used more fuel they were seldom used for heavy tillage work like the diesels were. Consequently, transmissions, diffentials, etc, were most likely subject to less wear. The clutch may have been subject to more abuse though if it was used with a loader or for utitlity purposes. Mine ran poorly until I had the carb completely overhauled. An overhaul included more than just a "kit". A new float was installed and anything else that was worn. Cost me over $200 for the carb overhaul but the tractor started instantly and never fouled a plug. I had also converted to the alternator, 12 volt negative ground and installed a second 12 volt battery. It was amazing how well this tractor would start at 20 below zero. If you live in a cold climate the cost of keeping the diesels "plugged in" should be factored in when considering cost of operating the tractor.

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JD Mech

04-09-2001 20:51:08

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Re: JD 4020 Good/Bad ? in reply to Steve, 04-09-2001 05:30:19

The 4020 gas is an o.k. chore tractor. Make for sure the radiator is not full of lime, With it not running it is hard to tell but see how it shifts. Do not put tractor in neutral and tow it down the road without the engine running. If you do then expect to tear down the transmission. It is a good idea to convert it to electronic ignition. The plugs burn so much better. Expect the cost of changing all fluids and filters so you know what kind of tractor you have got. A couple of years ago we had a customer trade in a 4020 gas that was litterly drug out of the woods where it had set for about 5 years. We went through it, put in a new clutch and sold it before it left my service bay. The guy that bought it uses it every day and loves it.

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JOHN

04-09-2001 20:18:16

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Re: JD 4020 Good/Bad ? in reply to Steve, 04-09-2001 05:30:19

well I dont know much about the 4020s but i have its little brother a 64 3020 GAS with a zenith carb runs great starts on the first crank in the winter even the only problem I had with the carb was the needle and seat stuck and it over flowed so I tore it apart and soaked it in a good dip carb cleaner over night and put it back together adjusted the float down a little more and I never had a problem since. As for being real bad on gas I feed every other day with this tractor and I use this for scraping pens I put 30 gallons of fuel in this tractor in january and it is still not out yet, my IH 504 gas would use twice as much fuel and take twice as long to start and warm up. sure the gas engines use more fuel compared to a diesel but not as much as some these guys say its sounds to me that if they fixed the starting problems, carb problems and tuned these up or overhauled them it would cut their fuel bills in half. you dont have to plug in a gas or either them in the winter also. I like diesels and gas just both have a better purpose. good luck

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john 2510-3020

04-09-2001 18:35:19

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Re: JD 4020 Good/Bad ? in reply to Steve, 04-09-2001 05:30:19

i have a 64 3020 gas that is terrable on gas it has a zenith carb and its just a 65hp tractor imagine what a 93hp tractor would be like drove it a half mile on feed mill to other farm and ahd used almost 6gal. of gas. but hay its your dicision not mine if i where you i wouldnt spend alot on it....

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G Taylor 3020 6 gallons to go 1/2 mile?

04-10-2001 22:09:27

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Re: Re: JD 4020 Good/Bad ? in reply to john 2510-3020, 04-09-2001 18:35:19

Time to service that 3020 if fuel consumption was 1/10 of that,that is an abnormal rate. About 1/2 lb of gasoline per HP per hour. So working at 80% load as recommended,80%x93HP= 74.4HP. 74.4HPx.5= 37.2 lbs of fuel per hour.Gasoline with an S.G of .720 so nearly six lbs per gallon.37.2/6= approx 6 & 1/4 gallons per hour. Certainly no more than 20% more or 7-1/2 gallons per hour even if the design was poor, which it wasn't.

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Steven

04-09-2001 17:12:38

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Re: JD 4020 Good/Bad ? in reply to Steve, 04-09-2001 05:30:19

I have a 1966 4020 Gas It has been a vary good tractor.It had a Marvel Schebler carburetor,but it has a Zenith now. I like the Zenith better.I am thinking about putting electronic ignition and Sparkplug adaptors on mine.with sparkplug adaptors you can use the latest automotive sparkplug technology in your tractor.

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Greg H.

04-09-2001 06:14:21

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Re: JD 4020 Good/Bad ? in reply to Steve, 04-09-2001 05:30:19

I have a 66 4020 gas, only it has the Zenith Carb, where it sounds like your prospect has a Marvel Swebler carb. You have more adjustments on that carb, but I've heard the rumor, that tractors with that carb use alittle more gas. Personally I found my 4020 to be a wonderful tractor,
[ after I got all the bugs worked out.] I use mine for pulling logs, silege wagons, and a square baler. I find it alittle too big for raking, but sometimes I do it anyway, just because it's comfortable. if you are going to rake with it run it in 7th at low rpms around 1100, govenor does a good job, and tractor will not burn too much gas. To make a long story short, if your can get it real cheep get it, but leave yourself enough room for an overhaul in a couple years. Also the first thing I would do is change it over to electronic ignition, and save yourself some headaches. I haven't noticed my tractor using an over about of gas, but then again I've never used it for tillage work. Good Luck, Greg H. PS There's always the collectors value later down the road.

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JD70Jim

04-09-2001 16:21:40

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Re: Re: JD 4020 Good/Bad ? in reply to Greg H., 04-09-2001 06:14:21

I saw a 1968 gas, with a Year Around Cab, wide front, dual valves go for $5500 last August in Iowa, at a farm auction. If the dealer appraisal was for how much they would give for it and not for how much rhey would likely sell it for, I would likely consider the offer. The gas engine does not have quite all of the superlatives of a diesel, but they make good power. It sounds like maybe the gas was left without a stabiliser and had gone bad. If so, a replacement of the old gas and cleaning the carb might be all she needs. Also, gassers are by far the minority of production, so the future collectable value may be pretty good. On 4010s, for which actual production numbers are known, there were 3613 gas and 36,736 diesel row crops. For Standards it was much worse or better depending on point of view... 98 gas and 11,370 diesels. Those numbers are for the earlier 4010 series when gas engines were more popular than they became in later production. It might just be a good thing to get, if the "appraised value" is reasonable enough.

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