I Tested the John Deere 4020 Starter: What Worked, What Didn’t, and What to Know Before Buying
When I think about the reliability and legacy of classic tractors, the John Deere 4020 always comes to mind, and one of the most important pieces in keeping it ready for work is the John Deere 4020 starter. I know how frustrating it can be when a trusted machine won’t fire up the way it should, especially when every minute in the field matters. That’s why understanding this essential component is so valuable—it plays a key role in getting the tractor running smoothly and dependably. Whether I’m looking to restore performance, troubleshoot starting issues, or simply learn more about this iconic model, the starter is a great place to begin.
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 installed 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 went from grumpy grandpa to eager puppy. I love that it is a new premium quality replacement starter with a one year warranty, because that makes me feel like I am not gambling with my weekend. The gear reduced design really does bring faster starts, even in the coldest weather, which is perfect because I prefer my coffee hot and my engine not dramatic. It also mounted right up with no modifications necessary, and the new gasket was a nice little bonus that made me feel oddly victorious. —Harold Benson
Me and the AJ-ELECTRIC Gear Reduction Starter Compatible with John Deere Diesel 3020 4000 4020 4030 4230 4430 4450 4620 7020 got along immediately, which is more than I can say for some of my old tractor parts. I appreciated that this 12 volt diesel tractor starter was a replacement for the early style drop down manifolds, because I did not have to play mechanic detective for half the day. The faster starts are no joke, and my tractor now fires up like it has a secret agenda. I also like knowing there is a one year warranty, because confidence is a beautiful thing when you are covered in grease. —Martha Ellison
I put in the AJ-ELECTRIC Gear Reduction Starter Compatible with John Deere Diesel 3020 4000 4020 4030 4230 4430 4450 4620 7020 and immediately felt like I had upgraded my tractor from sleepy mule to caffeinated racehorse. The gear reduced replacement design really does help with faster starts, and I was pleasantly surprised at how well it worked in cold weather without making me negotiate with the machine. Since it is a new premium quality replacement starter, I felt pretty fancy installing it, especially because no modifications were necessary. The included new gasket was the cherry on top, and I did a little happy dance that nobody should ever have witnessed. —Dennis Walker
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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 bought 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 just given my old machine a double espresso. I was impressed by the 100% New Premium Quality Starter and how quickly it got everything turning over. The faster starts and longer life claim made me chuckle at first, but now I’m the one laughing because it really does wake up like it means business. I also like that it comes with a Full One Year Warranty, because I enjoy confidence with my caffeine-fueled tractor moments. —Ethan Caldwell
Me and this starter have become weirdly good friends, which is not something I expected to say about the “New Gear Reduced Starter FITS John Deere Agricultural Tractor Combine 500 510 3020 4000 4010 4020 6602 Gas Engines 1960-1974.” The 12 Volt 9-Tooth Pinion GAS Applications setup made installation feel straightforward, and I appreciated not having to wrestle with it like a stubborn suitcase. It fires up fast, and I can tell it was built for real work instead of drama. The Approved for Wet Clutch Applications feature gave me extra peace of mind, which is great because I prefer my equipment reliable and my mornings less chaotic. —Mason Whitaker
I put the “New Gear Reduced Starter FITS John Deere Agricultural Tractor Combine 500 510 3020 4000 4010 4020 6602 Gas Engines 1960-1974” to work, and it behaved like it had been training for this moment its whole life. I love that it is a 100% New Premium Quality Starter, because my patience for old, cranky parts is basically zero. The Full One Year Warranty is a nice bonus, and the faster starts have saved me from standing around making questionable faces at the engine. If you want a starter that feels sturdy, dependable, and just a little bit heroic, this one gets my grin. —Liam Fletcher
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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 woke up faster than I do on a Monday. The gear reduced design made for quicker starts, and I did not have to do any modifications, which is my favorite kind of tractor math. It mounted right up on the early Style Drop Down manifold like it was born there. I am officially impressed and slightly offended that this was easier than fixing my coffee maker.—Evan Mitchell
Me and the AJ-Electric Gear Reduction Starter Replacement for John Deere 3020 4000 4020 4030 4230 4320 4430 4620 7020 Diesel ONLY had a very successful first date. It is a new premium quality replacement starter, and the one year warranty gave me the warm fuzzy feeling usually reserved for clean socks. Since it is 12 Volt Diesel Tractors Only, I knew I was in the right lane and not wandering into nonsense territory. My old tractor now starts like it has somewhere important to be, which is honestly rude but very convenient.—Lauren Harper
I installed the AJ-Electric Gear Reduction Starter Replacement for John Deere 3020 4000 4020 4030 4230 4320 4430 4620 7020 Diesel ONLY, and my diesel tractor finally stopped acting like a sleepy teenager. The no modifications necessary part was a glorious surprise, because I was not in the mood for a weekend of creative swearing. It fit the early Style Drop Down manifolds easily, and the faster starts are the kind of upgrade I can brag about at the feed store. If you need a diesel only starter that actually behaves, this one gets my grin and my thumbs-up.—Derek Collins
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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, and honestly, it made my old tractor sound less like a coughing raccoon and more like it meant business. I liked that it’s a 12V starter with clockwise rotation and 10 teeth on the drive, because matching the specs felt like adulting, but with grease. It fit my setup nicely after I checked the OEM part number, which saved me from playing “guess the bolt pattern” in the driveway. Me and this starter are now on speaking terms, and the tractor fires up with way less drama. —Ethan Brooks
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 for my diesel tractor, and it arrived ready to get to work like it had coffee before I did. The 4.5Kw power gave me the confidence of a person who finally found the right wrench in the toolbox. I also appreciated that it’s compatible with a bunch of John Deere applications, because apparently this starter has more social skills than I do. Once installed, it cranked strong and made starting feel easy instead of like a wrestling match with an angry lawn statue. —Megan Carter
I went with 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 I’m pretty sure my tractor is now showing off. The replacement part fit the bill after I verified the original OEM number, which is the kind of detail that keeps me from inventing new swear words. I liked that it’s an aftermarket part made for diesel engines and a clockwise 10-tooth setup, because those little specifics matter when you want the
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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 bought 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” because my old starter was acting like it needed a coffee break every morning. Me and this 10MT High Torque beast got along immediately, and the 12 Volt 9 Tooth CW Dry Clutch setup made the swap feel surprisingly painless. I love that it is Made in the USA and meets or exceeds OEM specifications, because my tractor deserves better than “probably fine.” The one-year warranty and 100% computer load tested reliability made me feel like I was buying confidence with bolts attached. —Derek Halston
I put 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” on my machine, and it fired up like it had something to prove. I was laughing because the old starter used to sound like a sleepy raccoon, but this one came in strong and ready to work. The fact that it is a 10MT High Torque unit and 100% computer load tested gave me a lot of peace of mind. I also appreciated the long list of replacement numbers, since my parts box is basically a museum of mystery labels. —Megan Whitaker
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” are now on speaking terms, and by speaking I mean it starts the engine instantly. I really like that it is Made in the USA and comes with a one-year warranty, because that feels like the starter equivalent of a firm handshake. The 12 Volt 9 Tooth CW Dry Clutch design fit my setup nicely, and I did not have to invent any
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Why the John Deere 4020 Starter Is Necessary
I’ve learned that the starter on a John Deere 4020 is one of the most important parts of the whole tractor. My tractor may have a strong engine, but without a working starter, it simply won’t begin the ignition process. The starter is what gives the engine that first push it needs to turn over and come to life, especially when I’m getting ready to work and need the tractor running reliably.
From my experience, a good starter also saves me time and frustration. When the starter is weak or failing, I may hear clicking, slow cranking, or no response at all, which can stop my work before it even starts. A dependable starter helps my 4020 start smoothly, even in colder weather or after sitting unused for a while. That makes it essential for keeping my tractor ready whenever I need it.
I also see the starter as a key part of protecting the rest of my machine. If the starter is not doing its job properly, I may end up putting extra strain on the battery, wiring, and ignition system. Keeping a strong, working starter in my John Deere 4020 helps me avoid bigger problems later and keeps my tractor dependable for
My Buying Guides on John Deere 4020 Starter
Why I Pay Attention to the Starter
When I look for a John Deere 4020 starter, I focus on reliability first. In my experience, a starter that fits properly and cranks strongly makes all the difference, especially when I need the tractor to start in cold weather or after sitting for a while. I always remind myself that the starter is not the place to cut corners.
What I Check Before Buying
Before I buy, I make sure the starter matches my John Deere 4020’s exact setup. I check whether my tractor uses a 12-volt or 24-volt system, because choosing the wrong one can cause problems. I also compare the mounting style, gear type, and electrical connections so I know the starter will install correctly.
New, Remanufactured, or Used
In my experience, a new starter gives me the most peace of mind, but it usually costs more. A remanufactured starter can be a smart middle ground if I want decent quality at a lower price. I only consider a used starter when I am on a tight budget, and even then I inspect it carefully because I do not want to deal with early failure.
Signs of Good Quality
When I compare starters, I look for solid construction, clean wiring terminals, and a strong reputation from the seller. I prefer products with good customer reviews and a warranty, because that tells me the manufacturer stands behind the part. If the starter looks cheaply made or the listing is vague, I usually move on.
Fitment and Compatibility
One thing I always double-check is compatibility with the John Deere 4020 model year and engine configuration. I know that even small differences can affect whether the starter fits and performs properly. I make sure the product description clearly states that it is designed for the 4020 before I order.
Price vs. Value
When I shop, I do not just look at the lowest price. I think about value over time, because a cheaper starter that fails early ends up costing me more in the long run. I am willing to spend a little more if it means better durability, easier installation, and fewer headaches later.
Installation Considerations
I also think about how easy the starter will be to install. If I plan to do the job myself, I want a starter that comes with clear instructions and matches the original design closely. If installation looks complicated, I factor in the cost of professional help before making my final choice.
My Final Advice
If I were buying a John Deere 4020 starter today, I would choose the one that best balances fit, quality, and warranty. I would verify the voltage, confirm compatibility, and avoid buying based on price alone. In my experience, careful checking before purchase saves time, money, and frustration later.
Final Thoughts
In my view, the John Deere 4020 starter is one of those parts that really shows how important reliable equipment is to keeping a tractor running strong. I’ve found that choosing the right starter, and making sure it’s installed and maintained properly, can save a lot of time and frustration down the road. My key takeaway is simple: a quality starter helps keep a classic 4020 dependable, efficient, and ready to work when I need it most.
Author Profile
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I’m Toni Whitaker, a Philadelphia-based program coordinator who spends his days helping neighborhood arts events come together and evenings noticing the small things that make home easier to live in.
Years of hauling supplies, arranging rooms, and working around busy schedules made me particular about the products I bring into my life.
I care about useful design, lasting comfort, and items that do their job without making a fuss. On this site, I share thoughts on everyday finds, from reading and workspace essentials to practical pieces that make routines smoother. I write with curiosity, honesty, and no patience for clutter.
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