John deere 4020 problems

Posted 3/26/2011 07:09 (#1690797) Subject: 4020 generator light issue solved. West Central Iowa. Following up on the dim generator light issue on my 1964 4020 diesel, open station tractor from last night. After doing some more checking, it became obvious that there still had to be a resistor in the circuit of the generator light.

John deere 4020 problems. Re: 4020 NOISY hydraulics in reply to buckeye al, 05-24-2002 14:33:20. SOUNDS LIKE YOU HAVE SURGEING OIL MAKING THE PRESSURE CONTROL VALVE MOVE BACK AND FORTH. YOU PROBABLY HAVE A PISTON HANGING UP OR A LEAKING INTAKE OR EX-VALVE IN THE PUMP. A PRESSURE GAUGE WILL SHOW THIS SURGE.

28 Apr 2022 ... Our old 4020 need a new motor. Today I will go over some of the challenges that I had making a decision on what to use, and talk about some ...

Short History of John Deere 4020. John Deere 4020 is a farm tractor made by John Deere between 1963 and 1972 and it was the most popular of the 20 Series New Generation tractors.; More than 184,000 units of JD 4020 tractors were manufactured. The tractor was available in three distinct configurations: row-crop, standard, and high-crop. …28 Apr 2022 ... Our old 4020 need a new motor. Today I will go over some of the challenges that I had making a decision on what to use, and talk about some ...Designing the New Generation John Deere Tractors by Merle Miller: 2510, 3020, 4020 Row-crop Tractors published in 1965, by John Deere: Tractors 1918-1976 published by John Deere * John Deere Tractors for 68 published in 1968: Standard and 4-Wheel-Drive Tractors: 70 to 280 HP published in 1970, by John Deere: Modern Farming published in 1965, by ...Find parts & diagrams for your John Deere equipment. Search our parts catalog, order parts online or contact your John Deere dealer.Aug 21, 2016 / 4020 3pt hitch problem. Thread Starter #11 . OP . 1. 1GH New member. Joined Aug 7, 2016 Messages 8 Location Uncas, Alberta, Canada ... John deere 4020. I see Tx Jim replied while i was typing. Later Geo Aug 21, 2016 / 4020 3pt hitch problem #13 . T. tysmobiletractor Member. Joined May 31, 2016 Messages 40But the 4020, 4230, etc. use large-frame starters the larger starter-solenoid can sometimes draw - or surge close to 20 amps. When hooked directly to a standard ignition switch or push-button - that gets a little worn - it can cause a problem. Using the extra relay in-between takes the load off the ignition switch.

Coyote Flats,Tx. Tractor. JD 4255/Kubota M7040 HDC. Yes the key is built into the wedge. I've never seen one stripped. Another thought is the possibility of a pinion shaft failure in the differential. If tractor has diff lock try depressing pedal ans see if tractor will move. May 13, 2013 / 1967 JD 4020 powershift transmission sudden failure #7.Hantavirus is a life-threatening viral infection spread to humans by rodents. Hantavirus is a life-threatening viral infection spread to humans by rodents. Hantavirus is carried by...Re: 4020 draft sensitivity problems in reply to Dave Walsh, 12-17-2006 18:57:57. I checked my shop manual for pre side console 4020. The only adjustment is the speed of drop, that lock nut and screw on the back cover of the rock shaft cylinder, just above the anchor of the upper three point link. Turning the screw in slows the oil leaving …Subject: Re: 4020 powershift problems. ecmn. the reverse issue is just the lever under the dash. a little weld build up and grind to new shape makes it right. the park you can look down on the right side and see if the linkage moves the little lever down there. some times the roll pin breaks so the paw doesn't lock.Aug 2, 2011 · The 4010 and VERY early (IIRC, pre-'65) 4020 tractors DO have a 3rd reverse. The later early models and on only have 2 reverse gears that are sped up. The the early ones, 1st reverse is the same speed as 3rd forward, 2nd reverse is like 5th and 3rd reverse is like 7th. So, 3rd reverse is 12mph. Great for plowing snow. :rock.

May 22, 2009 · I have a '67 4020. It has the two metal fuel filters. loosen the bleed screw on the bottom one, pump the lever on the back side of the fuel pump until fuel starts to run out, close it and open the one on the top filter. Aug 30, 2013 · I mentioned couple weeks ago picking up a 4020 w/powershift at local auction. It was 1 owner but we knew the maint was very poor... Changing all fluids and filters --expecting to see some gremlins pop up. Our issue now is the powershift going forward works great. Reverse, not so much. I have a '67 4020. It has the two metal fuel filters. loosen the bleed screw on the bottom one, pump the lever on the back side of the fuel pump until fuel starts to run out, close it and open the one on the top filter.The 2940 was never intended to be a replacement for a 4020. That's the spot the 4040 filled at the time, and it was a fine replacement for a 4020. The 28/2940 tractors were intended to be large utility tractors that were less expensive than a 4040, and they were exactly that. Edited by Big Ben 2/6/2017 16:03.The ignition switch on my 64 model 4020 has a white ceramic resistor built on the rear of the ignition switch. You would see a white ceramic tube like thing sticking out the rear of the switch. The 1.5 ohm coil needs aprox a 1.5 ohm ignition ballast resistor placed between it and the 12V power supply. If your ignition switch has the resistor ...Re: 1967 4020 generator problems in reply to GLEN J, 12-04-2006 06:56:42. See if you have 12 - 14.5 or 24 - 28 volts if a 24V system on battery terminals with a voltmeter indicating enough charging. If not check wiring, regulator, grounds, terminals, cables or pull generator and have it bench tested.

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Oil pumps have pickup screens that will stop a large part like a screw from being picked up, however, small bits of a broken shaft may pass through the openings and lodge in the rotors of the pump. If you did spin a bearing, plan a full lower end rebuild. 2010 3320 Cab. Loaded R3's, 300CX w/3rd SCV. 61" HD-Tooth Bar, 72" HD-bolt-on edge ...19644020 Discussion starter. 18 posts · Joined 2013. #3 · May 9, 2014. all of the other hydraulics function with out any problems. the tractor has one set of remotes that go to a tee that supplies the FEL and the implements. the only thing i've noticed about the FEL is when it is going up it kinda shakes like the pressure is pulsing rapidly ...John Deere has been a household name in the agriculture industry for over 180 years. With their commitment to innovation and sustainability, they have become a leader in the manufa...John Deere 4020 Problems, Specs, Attachments, Weight, Price, Engine and More. December 15, 2022 by Frank A. Richardson. John Deere 4020 is one of the most popular tractor models ever made. It was first introduced in 1963 and was in production for 19 years. It was a versatile machine that could be used for a variety of …JD 4020 Diesel Charging Problem. Jump to Latest Follow ... John Deere 4066R Deluxe Cab, 440R MSL Loader, AY11E72 4-in-1 Bucket, 485A BackhoeRemove the screw, install a plastic line on the fitting and start the tractor. Turn the steering wheel to the RH stop position and open the fitting slowly. Let oil bleed out the line until no bubbles are present then tighten the fitting. Be careful as the steering wheel may jump after the bubbles are gone. Recheck the steering.

When it comes to maintaining and repairing your John Deere tractor, you want to make sure you’re using genuine John Deere parts. Not only are genuine parts designed specifically fo...Re: 4020 draft sensitivity problems in reply to Dave Walsh, 12-17-2006 18:57:57. I checked my shop manual for pre side console 4020. The only adjustment is the speed of drop, that lock nut and screw on the back cover of the rock shaft cylinder, just above the anchor of the upper three point link. Turning the screw in slows the oil leaving the ...We have 9 3020-4020 tractors and they all act as you describe.We just live with it because after 1 minute all the hyd. work fine,part of farming with 40-50 year old tractors.I don't start in the mornings like I did 25 years ago either.LOL. OP.9 Feb 2016 ... John Deere Model 4020 Serial 22T 89000 1964 with Synchro-Range standard transmission. Parts for the rebuild (three bushings, two roll pins ...28 May 2023 ... How to adjust the clutch on a John Deere 4020. 7.4K ... John Deere 4020 SCV Rebuild (Well Kind Of) ... 3-Point lift issue on a 4020. Soybean Farmer ...I have a 1964 JD 4020 that I m trying to get up and running. I bought 2 new 12V batteries and tried hooking them up last night. How do I know which cable...Right when our spring cultivation season was finished the clutch went out on our Tractor. We were able to ship down a new clutch, bearings, gauge tool, and ...Mar 8, 2024 · Rockford, Michigan 49341. Phone: (616) 545-7021. visit our website. View Details. Email Seller Video Chat. 1972 John Deere 4020 Late 72 serial number Deluxe big fenders Correct 72 wide front This an excellent original paint tractor Starts runs and drives great Double stack front weight Kids 1 se... See More Details. As of October 2014, John Deere manuals are found online at the John Deere website by clicking on the “Services & Support” tab. Manuals are offered for online viewing for model year...

john deere 4020 problems By tqmachinery.com 23 January 2024 25 January 2024 Reading Time: 12 minutes Discover the John Deere 4020: Delve into our expertly crafted digital collection and explore the captivating history and legacy of this legendary tractor — an illustrious cornerstone in the annals of agricultural machinery.

Aug 1, 2012 · Total for the rebuild was $700 but was still cheaper than buying a reman brake valve, at least according to the local JD dealer anyway. Good News....the original brake valve was rebuildable. It solved the entire problem and it stops great. No more wheel lock up. The JD 4020 is now ready to go back to work. Subject: Re: 4020 John Deere info wanted. The early 4020 diesels came out of the factory with a goofy 24 volt positive ground system. It can be hard for the average person to work on. Some have been converted to 12 volt negative ground that is a lot simpler and easier to diagnose electrical problems on.Jul 29, 2016 · Both transmissions were pretty darned tough, but today the newest are 44 years old. I have 2 syncros and 1 power shift (4020s), plus a 2510, 3020, 4320. As far as sales data goes, it is sort of a guess. It would be a fair guess to say in the earlier years, (64-68) the 4020 sales were probably 35-40% power shift. It's also why Deere special ordered those pumps with an easily adjustable advance screw. 4020 is supposed to get a timing advance up around 16 engines degrees. That is a lot, and if it's not happening it can make a big difference in performance. 4020 is supposed to advance 2 engine degrees by 1000 engine RPM. Advance 10 degrees by 1600 RPM.Technician: Curtis B. This is the piece in the front end of tractor that hooks to the steering linkage. It acts as the power steering cylinder and rotates the steering shaft that goes to the front wheels. With a john deere it can be either the steering valve on the end of the steering hand wheel shaft or this.May 30, 2009. #1. I have a 4020 that is not getting any fuel to the injectors. I have bled the system and transfer pump is pumping good up to the injector pump. But when I crack the injectors nothing. There is a 5/16 bolt on the outward side of the injector pump. If I loosen this bolt, it will run normally but shoots fuel out the hole.Weird shifting problem - JD 4020. We have a 1969 John Deere 4020. A while back I began having shifting problems: If I put it in 5R, I need to fully let out the clutch for at least a 2 full seconds, or I will only be able to shift it into 5, 4, and 7. If I don't fully let it out, I'll have to turn the tractor off, turn it back on, place it in ...Super busy on the farm preparing for fall harvest. #farming #farm #georgiasouthern #johnDeere #tractor

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Designing the New Generation John Deere Tractors by Merle Miller: 2510, 3020, 4020 Row-crop Tractors published in 1965, by John Deere: Tractors 1918-1976 published by John Deere * John Deere Tractors for 68 published in 1968: Standard and 4-Wheel-Drive Tractors: 70 to 280 HP published in 1970, by John Deere: Modern Farming published in 1965, by ...The John Deere 5.9 L, 5,930 cm 2, (362 cu·in) six-cylinder LPG / gasoline engine with 108.0 mm (4.25 in) of cylinder bore and 108.0 mm (4.25 in) of piston stroke. The compression ratio rating is 7.5:1 for gasolibe version and 9.0:1 for LPG-version. Following attachments are available for John Deere 4020 farm tractor: John Deere 148 front ...1) The 4020 in question is a front console, manual PTO. 2) It had been making a whining noise with the PTO running for a while, apparently coming from the stack of gears between the bell housing and the transmission. 3) My brother in law was round baling, heard a loud bang and the tractor stalled out. He disengaged the PTO and the tractor drove ...Oil pumps have pickup screens that will stop a large part like a screw from being picked up, however, small bits of a broken shaft may pass through the openings and lodge in the rotors of the pump. If you did spin a bearing, plan a full lower end rebuild. 2010 3320 Cab. Loaded R3's, 300CX w/3rd SCV. 61" HD-Tooth Bar, 72" HD-bolt-on edge ...Short Solutions. Engine Issues. If the filter becomes clogged, replace it or clean it. Damaged or blocked fuel injection nozzles should be inspected and replaced. Problems with Transmission. When the fluid level in the transmission housing is low, add fluid.When transmission oil leaks, clean or replace the return tube. Hydraulic System Issues.May 30, 2009. #1. I have a 4020 that is not getting any fuel to the injectors. I have bled the system and transfer pump is pumping good up to the injector pump. But when I crack the injectors nothing. There is a 5/16 bolt on the outward side of the injector pump. If I loosen this bolt, it will run normally but shoots fuel out the hole.2. Tractor. John Deere 4020 Gas. It's sitting in the five inches of snow that fell last night. I live in southern Minnesota. I'm clearing CRP land so it can be planted. Of course it stalled as far from the road as possible. Brought in a mechanic. Changed the rotter, wasn't getting a spark to the plugs.The John Deere 4020 uses a cartridge-style oil filter that is 6-7/16 inches tall and 3-1/8 inches wide. This oil filter is commonly identified by the part number AR26350. Several reputable online retailers sell replacement oil filters for the 4020, including: Steiner Tractor Parts. Nick Young Tractor Parts.Re: 4020 draft sensitivity problems in reply to Dave Walsh, 12-17-2006 18:57:57. I checked my shop manual for pre side console 4020. The only adjustment is the speed of drop, that lock nut and screw on the back cover of the rock shaft cylinder, just above the anchor of the upper three point link. Turning the screw in slows the oil leaving the ...disconnect all the lines & linkages.. remove the side cover on the pump, 2 flat head screws, drain.. 2 lines under the side cover, 1 is stationary & 1 rotates.. rotate engine until BOTH lines line-up & stop.. Now remove the 2 or 3 nuts holding the pump down & pull up.. DONE. ….

Re: 4020 NOISY hydraulics in reply to buckeye al, 05-24-2002 14:33:20. SOUNDS LIKE YOU HAVE SURGEING OIL MAKING THE PRESSURE CONTROL VALVE MOVE BACK AND FORTH. YOU PROBABLY HAVE A PISTON HANGING UP OR A LEAKING INTAKE OR EX-VALVE IN THE PUMP. A PRESSURE GAUGE WILL SHOW THIS SURGE. Weird shifting problem - JD 4020. We have a 1969 John Deere 4020. A while back I began having shifting problems: If I put it in 5R, I need to fully let out the clutch for at least a 2 full seconds, or I will only be able to shift it into 5, 4, and 7. If I don't fully let it out, I'll have to turn the tractor off, turn it back on, place it in ...The John Deere X300 tractor is one of the most popular and reliable tractors on the market today. It has been a staple of farms and gardens for years, and its versatility makes it ...#1. 4020 synchro has a dry clutch and the tranny is not particularly notorious for jumping out of fear under ANY conditions unless badly worn. Powershift still has a dry clutch at the flywheel, a "torque limiter", and in the earlier serial numbers it can be disengaged with a separate little lever to make cold weather starting easier.John Deere 4020 12-Volt Wiring Common Issues and Troubleshooting Tips. The John Deere 4020 is a popular tractor model among farmers and enthusiasts. However, like any other machinery, it may encounter wiring issues from time to time. Here are some common problems and troubleshooting tips related to the 12-volt wiring on the John Deere 4020: 1.probably needs the injection pump rebuilt. Likely. caused by the governor weight assembly flex ring. breaking apart. Being exposed to the fuel, heat and. time it becomes hard and starts breaking to pieces. The pieces float around in the pump and get lodged in. to the wrong places and cause this kind of symptom. Let us see if others confirm.Performance and guidance are solid across all segments....DE Deere & Co (DE) released the firm's fiscal second quarter financial results on Friday morning. For the three month peri...Subject: Re: 4020 John Deere info wanted. The early 4020 diesels came out of the factory with a goofy 24 volt positive ground system. It can be hard for the average person to work on. Some have been converted to 12 volt negative ground that is a lot simpler and easier to diagnose electrical problems on.If you’re looking for agricultural, forestry or construction machinery, you can’t go wrong if you choose John Deere. For additional product information and warranty coverage, you n... John deere 4020 problems, I have a '67 4020. It has the two metal fuel filters. loosen the bleed screw on the bottom one, pump the lever on the back side of the fuel pump until fuel starts to run out, close it and open the one on the top filter., Report to Moderator. Re: 4020 gas distributor in reply to Ryan, 10-19-2004 08:28:20. I would suggest doing a compression test on it warm up the engine first then make sure the choke is not shut and the throttle is full open to allow air to enter freely. Won't hurt to check the adjustment on the rocker arms for proper clearance., Posted 8/17/2014 15:15 (#4023086 - in reply to #4023062) Subject: RE: John Deere 4020 Powershift. Southeastern, IL. Very tough transmission. We have a 67 model with 9300 hours. It has M & W turbo that is running around 120 hp. It use to pull a 12 row planter with 400 gallon of fluid for 15 years and then just bare planter for 5 years., Weird shifting problem - JD 4020. We have a 1969 John Deere 4020. A while back I began having shifting problems: If I put it in 5R, I need to fully let out the clutch for at least a 2 full seconds, or I will only be able to shift it into 5, 4, and 7. If I don't fully let it out, I'll have to turn the tractor off, turn it back on, place it in ..., May 30, 2009. #1. I have a 4020 that is not getting any fuel to the injectors. I have bled the system and transfer pump is pumping good up to the injector pump. But when I crack the injectors nothing. There is a 5/16 bolt on the outward side of the injector pump. If I loosen this bolt, it will run normally but shoots fuel out the hole., Sep 7, 2015 · JD 4020 Diesel Charging Problem. Jump to Latest Follow ... John Deere 4066R Deluxe Cab, 440R MSL Loader, AY11E72 4-in-1 Bucket, 485A Backhoe , 4020 starter problem - 24volt. ... My older 4020 with hydraulic levers on the dash is having starter problems. It's still a 24 volt system. ... A forum community dedicated to John Deere tractor owners …, #1. 4020 synchro has a dry clutch and the tranny is not particularly notorious for jumping out of fear under ANY conditions unless badly worn. Powershift still has a dry clutch at the flywheel, a "torque limiter", and in the earlier serial numbers it can be disengaged with a separate little lever to make cold weather starting easier., Common problems with John Deere tractors include engine problems, such as overheating, poor running performance and backfiring. Other common problems with John Deere tractors inclu..., Coyote Flats,Tx. Tractor. JD 4255/Kubota M7040 HDC. Yes the key is built into the wedge. I've never seen one stripped. Another thought is the possibility of a pinion shaft failure in the differential. If tractor has diff lock try depressing pedal ans see if tractor will move. May 13, 2013 / 1967 JD 4020 powershift transmission sudden failure #7., Take a trip down memory lane with retired sales guru, Keith Wood, as he explains how the John Deere 4020 changed farming technology forever. With over 180,0..., Flat Threaded Nested. John Burns. Posted 2/8/2008 19:03 (#304844) Subject: Harmonic crankshaft balbncers on John Deere tractors. Pittsburg, Kansas. We have both 8000 and 9000 series JD tractors. Winter service at the dealers this year the mechanic was on us to replace the harmonic balancers on about all of them. Did not do it., Take disc, and slip it on the front of the small shaft and see if the PTO shaft moves in the rear when disc is turned. Ask Your Own Agriculture and Farm Equipment Question. Ok. Mechanic: Curtis B. Might all be good. Ask Your Own Agriculture and Farm Equipment Question. when spinning it the the pto still isn’t spinning. Mechanic: Curtis B., I have a '67 4020. It has the two metal fuel filters. loosen the bleed screw on the bottom one, pump the lever on the back side of the fuel pump until fuel starts to run out, close it and open the one on the top filter., May 22, 2009 · I have a '67 4020. It has the two metal fuel filters. loosen the bleed screw on the bottom one, pump the lever on the back side of the fuel pump until fuel starts to run out, close it and open the one on the top filter. , Dec 19, 2011. #1. There should be a plug under the valve housing and behind the breakaway couplers that a 1/2 inch extention will take out. You need a 9/16 deep socket on a 12-18 inch extention, taped/welded on so you don't loose in the rear end. And the procedure should be in your manual. Something like having the lever 1 inch from full up ..., 4020 History. 4020 Fans; Models 4020, 3020, 4000 - Fan Letter; 4020 Photos; 4020 Serial Numbers; 4320 (Super 4020) "'The Long Green Line (tm)' of John Deere Tractors has included several that were classic - the models 'D', 'A' and 'G', among others. But none wears that designation more deservedly than the 4020. It was the most popular tractor ..., 4020 injector pump issue. Jump to Latest Follow. 10K views 13 replies 3 participants last post by thepumpguysc May 16, 2022. mastrkee Discussion starter. 27 …, Several questions for those who have installed &/or who are running turbo chargers on their 4020 diesels: 1/ Comp. ratio - Anyone running a turbo with aftermarket "high compression" pistons? (ex. Reliance's 17.65:1 pistons) 2/ Boost - What numbers are you seeing? What turbo are you running?, Aug 2, 2011 · The 4010 and VERY early (IIRC, pre-'65) 4020 tractors DO have a 3rd reverse. The later early models and on only have 2 reverse gears that are sped up. The the early ones, 1st reverse is the same speed as 3rd forward, 2nd reverse is like 5th and 3rd reverse is like 7th. So, 3rd reverse is 12mph. Great for plowing snow. :rock. , We would like to show you a description here but the site won’t allow us., Dec 11, 2023. #7. The original grade 5 bolts were torqued to 115 and re-torqued again after engine was warmed up to. operating temperature. Loosen one bolt at a time in sequence pattern and re-tighten it. You will. see they will turn down another 1/8 to 1/4 turn depending on length of bolt. The old replacement., Aug 21, 2016 / 4020 3pt hitch problem. Thread Starter #11 . OP . 1. 1GH New member. Joined Aug 7, 2016 Messages 8 Location Uncas, Alberta, Canada ... John deere 4020. I see Tx Jim replied while i was typing. Later Geo Aug 21, 2016 / 4020 3pt hitch problem #13 . T. tysmobiletractor Member. Joined May 31, 2016 Messages 40, Subject: Re: 4020 John Deere info wanted. The early 4020 diesels came out of the factory with a goofy 24 volt positive ground system. It can be hard for the average person to work on. Some have been converted to 12 volt negative ground that is a lot simpler and easier to diagnose electrical problems on., If you’re looking for agricultural, forestry or construction machinery, you can’t go wrong if you choose John Deere. For additional product information and warranty coverage, you n..., Hantavirus is a life-threatening viral infection spread to humans by rodents. Hantavirus is a life-threatening viral infection spread to humans by rodents. Hantavirus is carried by..., John Deere 4020 Tractor Sold for $50,000 in Minnesota. The June 18, 2011 estate sale in Steen, MN (southwest Minnesota) for Bill DeYager by Polk Auction Company saw the sale of the John Deere 4020. This auction featured Bill’s amazing line of “Next Generation” Deere tractors, so 10 and 20 Series models. The tractors highlighted at this ..., The John Deere X300 tractor is one of the most popular and reliable tractors on the market today. It has been a staple of farms and gardens for years, and its versatility makes it ..., Weird shifting problem - JD 4020. We have a 1969 John Deere 4020. A while back I began having shifting problems: If I put it in 5R, I need to fully let out the clutch for at least a 2 full seconds, or I will only be able to shift it into 5, 4, and 7. If I don't fully let it out, I'll have to turn the tractor off, turn it back on, place it in ..., John Deere 4020 Tractor Sold for $50,000 in Minnesota. The June 18, 2011 estate sale in Steen, MN (southwest Minnesota) for Bill DeYager by Polk Auction Company saw the sale of the John Deere 4020. This auction featured Bill’s amazing line of “Next Generation” Deere tractors, so 10 and 20 Series models. The tractors highlighted at this ..., Take disc, and slip it on the front of the small shaft and see if the PTO shaft moves in the rear when disc is turned. Ask Your Own Agriculture and Farm Equipment Question. Ok. Mechanic: Curtis B. Might all be good. Ask Your Own Agriculture and Farm Equipment Question. when spinning it the the pto still isn’t spinning. Mechanic: Curtis B., Jul 13, 2015 · The super 4020 title was a very accurate on for them. 18.4x38 tires are probably the most common size for them. The power difference between them and a 4020 is very noticeable. Without a turbo a 4020 will usually smoke very heavy once you push it to around 110 hp. With the turbo the 4320 can push up near 150 with very little difficulty. , Posted 3/26/2011 07:09 (#1690797) Subject: 4020 generator light issue solved. West Central Iowa. Following up on the dim generator light issue on my 1964 4020 diesel, open station tractor from last night. After doing some more checking, it became obvious that there still had to be a resistor in the circuit of the generator light.