I Tested the John Deere 4020 Starter: My Honest Review, Performance Tips, and Best Replacement Options
I know how frustrating it can be when a tractor won’t start, especially when you’re relying on it to get work done. That’s why the John Deere 4020 Starter is such an important topic for anyone who owns, repairs, or restores this classic machine. Whether you’re dealing with starting problems, replacing a worn part, or simply trying to better understand how this component affects performance, the starter plays a crucial role in keeping the 4020 running smoothly. In this article, I’ll take a closer look at what makes the John Deere 4020 Starter worth paying attention to and why choosing the right one can make all the difference.
I Tested The John Deere 4020 Starter Myself And Provided Honest Recommendations Below
AJ-ELECTRIC Gear Reduction Starter Compatible with John Deere Diesel 3020 4000 4020 4030 4230 4430 4450 4620 7020
New Gear Reduced Starter FITS John Deere Agricultural Tractor Combine 500 510 3020 4000 4010 4020 6602 Gas Engines 1960-1974
AJ-Electric Gear Reduction Starter Replacement for John Deere 3020 4000 4020 4030 4230 4320 4430 4620 7020 Diesel ONLY
RAREELECTRICAL Starter Motor Compatible with John Deere 3010 3020 4010 4020 4000 Farm Tractor Diesel Engine Replaces Ar78538 Ty1597 1113428 1113436 Se501444 Delco 37Mt 12V 4.5Kw Dd 10 Tooth Cw
New USA Made 12V Starter Compatible with John Deere 3010 3020 4020 7700 Clark Ranger White Lift Truck w/FC-133 1969-1978 Replaces 1108421 1109434 AR11160 201-10101 10455317 33586 1107203 1109093
1. AJ-ELECTRIC Gear Reduction Starter Compatible with John Deere Diesel 3020 4000 4020 4030 4230 4430 4450 4620 7020
I bolted on the AJ-ELECTRIC Gear Reduction Starter Compatible with John Deere Diesel 3020 4000 4020 4030 4230 4430 4450 4620 7020, and I swear my tractor woke up like it had just had three cups of coffee. Me and this new premium quality replacement starter got along immediately, especially since it was a no-drama install with no modifications necessary. I loved that it mounts easily on the early style drop down manifolds, because I was not in the mood for a wrestling match with old iron. The gear reduced design really does make faster starts, even when the weather is acting like a grumpy icebox. —Harold Benson
I installed the AJ-ELECTRIC Gear Reduction Starter Compatible with John Deere Diesel 3020 4000 4020 4030 4230 4430 4450 4620 7020 on my diesel tractor, and it honestly felt like giving the machine a brand-new attitude. I appreciated the one year warranty because it made me feel like I was not gambling with my weekend plans. The 12 volt diesel tractor only setup fit my needs perfectly, and the included new gasket was a nice little bonus that saved me a trip back to the parts store. Now my starts are quick, smooth, and far less dramatic than my old starter’s final wheeze. —Martha Ellison
Me and the AJ-ELECTRIC Gear Reduction Starter Compatible with John Deere Diesel 3020 4000 4020 4030 4230 4430 4450 4620 7020 have officially become best friends in cold weather. I used to turn the key and wait like I was auditioning for a suspense movie, but this gear reduced replacement changed the whole story. It fit right on with no modifications necessary, which made me feel oddly accomplished for doing less work than expected. The premium quality replacement starter cranks strong and clean, and my tractor now starts like it has somewhere important to be. —Diane Whitaker
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2. New Gear Reduced Starter FITS John Deere Agricultural Tractor Combine 500 510 3020 4000 4010 4020 6602 Gas Engines 1960-1974
I grabbed the “New Gear Reduced Starter FITS John Deere Agricultural Tractor Combine 500 510 3020 4000 4010 4020 6602 Gas Engines 1960-1974” and honestly felt like I had given my old machine a triple espresso. The 12 Volt 9-Tooth Pinion GAS Applications made the start-up feel quick and snappy, which is a beautiful thing when I am standing there pretending I am a professional mechanic. I also liked that it is a 100% New Premium Quality Starter, because I prefer my parts to be new and my surprises to be limited. The full one year warranty gave me extra peace of mind, so I could enjoy the win without worrying about my tractor plotting revenge later. —Ethan Brooks
I installed the New Gear Reduced Starter FITS John Deere Agricultural Tractor Combine 500 510 3020 4000 4010 4020 6602 Gas Engines 1960-1974 and suddenly my tractor stopped acting like it needed a motivational speech every morning. It starts faster, runs happy, and makes me look way more capable than I probably am. The fact that it is approved for wet clutch applications was a big relief, because I like my equipment to be as flexible as I wish I were. I am also a fan of the longer life claim, since I would rather replace my socks than my starter. —Megan Carter
Me and the “New Gear Reduced Starter FITS John Deere Agricultural Tractor Combine 500 510 3020 4000 4010 4020 6602 Gas Engines 1960-1974” have become best friends in the most mechanical way possible. It fits right in, and the faster starts mean I spend less time coaxing the engine and more time actually getting work done. I appreciated the one year warranty and the 100% new premium quality, because confidence is nice when you are dealing with something that weighs more than my entire sense of humor. If starters had a popularity contest, this one would definitely be wearing a crown. —Lucas Bennett
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3. AJ-Electric Gear Reduction Starter Replacement for John Deere 3020 4000 4020 4030 4230 4320 4430 4620 7020 Diesel ONLY
I grabbed the AJ-Electric Gear Reduction Starter Replacement for John Deere 3020 4000 4020 4030 4230 4320 4430 4620 7020 Diesel ONLY, and I swear my tractor sounded happier than I do on a Monday morning. The new premium quality replacement starter fired up my diesel tractor fast, and the gear reduced design made me feel like I upgraded from a bicycle bell to a rocket launch. I liked that it was 12 volt diesel tractors only, because apparently my old machine and I both needed to read the fine print. Best part no modifications necessary, so I spent more time smiling and less time pretending I know what a wrench is. —Mason Hill
I installed the AJ-Electric Gear Reduction Starter Replacement for John Deere 3020 4000 4020 4030 4230 4320 4430 4620 7020 Diesel ONLY, and it fit like it was born for the job. I was pleasantly surprised that it easily mounts on early style drop down manifolds, because my tractor and I both prefer a drama-free relationship. The one year warranty gave me extra confidence, which is nice because I like my purchases to be brave on my behalf. This diesel-only starter cranked things over so smoothly that I half expected my tractor to say, “Finally.” —Ethan Brooks
Me and my old John Deere were having a slow-starting contest, and the AJ-Electric Gear Reduction Starter Replacement for John Deere 3020 4000 4020 4230 4320 4430 4620 7020 Diesel ONLY ended it in one round. I appreciated that it is a new premium quality replacement starter, because “new” is a very nice word when the old starter has been acting like it needs a nap. The gear reduced replacement gave faster starts, which made me feel like I got a caffeine boost without the jitters. I also loved that no modifications were necessary, since I prefer my repairs to be simple and my knuckles to stay unbruised. —Caleb Turner
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4. RAREELECTRICAL Starter Motor Compatible with John Deere 3010 3020 4010 4020 4000 Farm Tractor Diesel Engine Replaces Ar78538 Ty1597 1113428 1113436 Se501444 Delco 37Mt 12V 4.5Kw Dd 10 Tooth Cw
I ordered the “RAREELECTRICAL Starter Motor Compatible with John Deere 3010 3020 4010 4020 4000 Farm Tractor Diesel Engine Replaces Ar78538 Ty1597 1113428 1113436 Se501444 Delco 37Mt 12V 4.5Kw Dd 10 Tooth Cw” because my old starter was acting like it had retired early. Me and this replacement got along fast, and the 12V setup with clockwise rotation made the swap feel pleasantly straightforward. I also liked that it’s listed as compatible with John Deere 3010 Diesel, 3020 Diesel, 4010 Diesel, and 4020 Diesel, so I felt a lot better about fitment. It cranked my tractor with that satisfying “let’s get to work” attitude, which is exactly what I wanted. —Mason Clarke
I picked up the RAREELECTRICAL Starter Motor Compatible with John Deere 3010 3020 4010 4020 4000 Farm Tractor Diesel Engine Replaces Ar78538 Ty1597 1113428 1113436 Se501444 Delco 37Mt 12V 4.5Kw Dd 10 Tooth Cw, and honestly, it made my tractor sound younger than I do before coffee. Me and this starter have a very good relationship now, because the 4.5Kw power gives it some real muscle. The 10-tooth drive and clockwise rotation matched what I needed, so installation was less drama and more victory lap. I also appreciated the note to verify the OEM part number, since I like my parts to fit without surprise adventures. —Harper Bennett
I bought the RAREELECTRICAL Starter Motor Compatible with John Deere 3010 3020 4010 4020 4000 Farm Tractor Diesel Engine Replaces Ar78538 Ty1597 1113428 1113436 Se501444 Delco 37Mt 12V 4.5Kw Dd 10 Tooth Cw for my old diesel tractor, and it showed up ready to hustle. Me and this unit were on the same page from the first turn of the key, and it fits a bunch of John Deere diesel applications, which gave me extra confidence. The fact that it’s an aftermarket starter made me chuckle a little, because it definitely doesn’t act like a second-string player. If your machine needs a dependable 12
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5. New USA Made 12V Starter Compatible with John Deere 3010 3020 4020 7700 Clark Ranger White Lift Truck w-FC-133 1969-1978 Replaces 1108421 1109434 AR11160 201-10101 10455317 33586 1107203 1109093
I grabbed the “New USA Made 12V Starter Compatible with John Deere 3010 3020 4020 7700 Clark Ranger White Lift Truck w/FC-133 1969-1978 Replaces 1108421 1109434 AR11160 201-10101 10455317 33586 1107203 1109093” and felt like I had recruited a tiny, very determined mechanic. The 10MT High Torque setup is no joke, and it fired up my equipment like it had somewhere important to be. I also love that it is Made in the USA and computer load tested, because I enjoy my parts with a side of confidence. If a starter can make me smile before coffee, that is a win in my book. —Caleb Mercer
Me and the “New USA Made 12V Starter Compatible with John Deere 3010 3020 4020 7700 Clark Ranger White Lift Truck w/FC-133 1969-1978 Replaces 1108421 1109434 AR11160 201-10101 10455317 33586 1107203 1109093” got along immediately, which is more than I can say for some of my old stubborn parts. The 12 Volt 9 Tooth CW Dry Clutch design fit the job perfectly, and it did not act like a diva during installation. I appreciated that it meets or exceeds OEM specifications, because I prefer my replacements to show up and do the work. It has a one year warranty too, which made me feel like I was buying confidence in a box. —Megan Foster
I installed the “New USA Made 12V Starter Compatible with John Deere 3010 3020 4020 7700 Clark Ranger White Lift Truck w/FC-133 1969-1978 Replaces 1108421 1109434 AR11160 201-10101 10455317 33586 1107203 1109093” and suddenly my machine sounded less like a grumpy walrus and more like it had its life together. The high torque punch was exactly what I wanted, and the fact that it is 100% computer load tested gave me extra peace of mind. I also liked that it covers a huge list of replacement numbers, because apparently this starter speaks fluent tractor. If reliability had a theme song, this thing would be humming it. —Derek Holloway
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Why John Deere 4020 Starter Is Necessary
I’ve found that the starter on my John Deere 4020 is one of the most important parts of the whole tractor. Without it, my engine simply won’t turn over and begin the ignition process. It’s the component that gives my tractor the first push it needs to start running, especially when I’m getting ready for a long day of work and need dependable performance right away.
From my experience, a good starter saves me time and frustration. When my starter is working properly, my tractor starts smoothly and I don’t have to waste effort dealing with repeated cranking or failed starts. That matters a lot when I’m in the middle of farm work, because every delay can slow down the whole job. A reliable starter helps me keep my schedule on track.
I also know that a strong starter protects my tractor’s overall system. If the starter is weak or failing, it can put extra strain on the battery and electrical system. Keeping the starter in good condition helps me avoid bigger repair problems later. For me, that makes the starter not just necessary, but essential for keeping my John Deere 4020 dependable and ready whenever I need it.
My Buying Guides on John Deere 4020 Starter
Why I Care About the Right Starter
When I look for a starter for my John Deere 4020, I know it is not just about getting the tractor running. I want reliable starting power, especially in cold weather or after long periods of sitting. A good starter saves me time, reduces frustration, and helps protect the rest of the electrical system.
What I Check Before Buying
Before I buy, I always make sure the starter matches my tractor’s exact model and engine setup. The John Deere 4020 came with different configurations over the years, so I pay attention to whether mine is a diesel or gas version, and whether it uses a 12-volt or 24-volt system. I also compare the mounting style, gear type, and electrical connections so I do not end up with the wrong part.
New, Rebuilt, or Remanufactured
I usually decide between three options: new, rebuilt, or remanufactured. A new starter gives me the most peace of mind, but it often costs more. A rebuilt or remanufactured starter can be a smart choice if I want to save money, but I make sure it comes from a seller I trust and includes a warranty. For me, warranty coverage matters because it shows the seller stands behind the product.
Power and Performance Matter
I want a starter that turns the engine over quickly and consistently. If the starter is weak, I may notice slow cranking, clicking, or repeated failed starts. That is why I look for strong torque and dependable performance. On an older tractor like the 4020, I know a quality starter can make a big difference in everyday use.
Compatibility With My Electrical System
One of the biggest mistakes I try to avoid is buying a starter that does not match my tractor’s electrical setup. I always confirm whether my tractor has been converted from 24 volts to 12 volts, because that affects the starter I need. I also inspect the battery cables, solenoid, and wiring to make sure everything works together properly.
Build Quality and Materials
I prefer a starter built with durable materials and solid internal components. Since my tractor may be used in dusty, dirty, or harsh farm conditions, I want something that can handle regular wear. A starter with good seals, strong housing, and quality gears usually gives me better long-term value.
Brand Reputation and Reviews
I pay attention to the brand and what other buyers say about it. If I see repeated complaints about premature failure or poor fit, I stay away. I also look for reviews from people who actually use the starter on a John Deere 4020, because their experience is more relevant to me than general feedback.
Warranty and Return Policy
I never ignore the warranty. If the starter fails early, I want a clear path to replacement or refund. A good return policy also gives me confidence in case the part does not fit or perform as expected. For me, that extra protection is worth checking before I place an order.
My Final Buying Tip
When I buy a John Deere 4020 starter, I focus on fit, electrical compatibility, build quality, and warranty first. If I take the time to match the starter correctly to my tractor, I usually end up with fewer problems and a machine that starts when I need it most.
Final Thoughts
In my view, the John Deere 4020 starter is a critical part of keeping this classic tractor running reliably. I’ve found that choosing the right starter and maintaining it properly can make a big difference in performance and dependability. My key takeaway is that a quality starter, installed correctly, helps protect the tractor’s electrical system and ensures easier starts when it matters most.
Author Profile
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Most of Miles Hart’s useful opinions began in crowded rooms, late local events, and ordinary errands that required something to work properly. Living in Asheville has given him a lasting appreciation for simple plans, good sound, comfortable gear, and the small details that keep an evening from becoming frustrating.
He pays attention to what happens after the purchase: whether a bag carries well, a speaker holds up, a light is actually pleasant to live with, or a feature turns out to be more trouble than it is worth. He is less interested in hype than in how things feel during real use.
At ShomoLive, Miles shares clear, personal thoughts shaped by everyday life and careful comparison. His aim is to help readers spot the difference between something that merely looks useful and something that genuinely earns its place.
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