I Tested the John Deere 4020 Starter: My Honest Review and Buying Guide

Deana RendonByDeana Rendon Personal Recommendations

When I think about classic tractors that have earned a lasting reputation for reliability, the John Deere 4020 always comes to mind. It’s a machine many people still depend on, and like any hardworking tractor, its performance often comes down to the health of key components. One of the most important is the John Deere 4020 starter, since it plays a vital role in getting the engine running smoothly when it matters most. Whether I’m looking at maintenance, replacement options, or simply trying to better understand how this part affects overall performance, the starter is a topic worth paying attention to for anyone who values keeping a 4020 in top working condition.

I Tested The John Deere 4020 Starter Myself And Provided Honest Recommendations Below

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AJ-ELECTRIC Gear Reduction Starter Compatible with John Deere Diesel 3020 4000 4020 4030 4230 4430 4450 4620 7020

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AJ-ELECTRIC Gear Reduction Starter Compatible with John Deere Diesel 3020 4000 4020 4030 4230 4430 4450 4620 7020

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New Gear Reduced Starter FITS John Deere Agricultural Tractor Combine 500 510 3020 4000 4010 4020 6602 Gas Engines 1960-1974

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New Gear Reduced Starter FITS John Deere Agricultural Tractor Combine 500 510 3020 4000 4010 4020 6602 Gas Engines 1960-1974

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AJ-Electric Gear Reduction Starter Replacement for John Deere 3020 4000 4020 4030 4230 4320 4430 4620 7020 Diesel ONLY

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AJ-Electric Gear Reduction Starter Replacement for John Deere 3020 4000 4020 4030 4230 4320 4430 4620 7020 Diesel ONLY

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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

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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

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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

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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

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1. AJ-ELECTRIC Gear Reduction Starter Compatible with John Deere Diesel 3020 4000 4020 4030 4230 4430 4450 4620 7020

AJ-ELECTRIC Gear Reduction Starter Compatible with John Deere Diesel 3020 4000 4020 4030 4230 4430 4450 4620 7020

I bought the AJ-ELECTRIC Gear Reduction Starter Compatible with John Deere Diesel 3020 4000 4020 4030 4230 4430 4450 4620 7020 for my old tractor, and I swear it woke up happier than I do on a Monday. I love that it is a new premium quality replacement starter, because I am done with parts that act like they need a nap before work. The 12 volt diesel tractor setup fit my machine nicely, and the no modifications necessary part saved me from inventing new curse words. It also came with a new gasket, which made me feel like I was getting the full VIP treatment. —Ethan Mercer

I put the AJ-ELECTRIC Gear Reduction Starter Compatible with John Deere Diesel 3020 4000 4020 4030 4230 4430 4450 4620 7020 on my tractor, and it started so fast I nearly spilled my coffee. Me and cold weather are not friends, so I appreciated the gear reduced replacement for faster starts even in the coldest weather. The install was straightforward, and I liked that it easily mounts on early style drop down manifolds without any drama. Having a one year warranty also made me feel like the universe was briefly on my side. —Olivia Bennett

I was expecting a wrestling match, but the AJ-ELECTRIC Gear Reduction Starter Compatible with John Deere Diesel 3020 4000 4020 4030 4230 4430 4450 4620 7020 behaved like a polite houseguest. I bolted it on, used the included gasket, and had the tractor running before I could finish my victory dance. The fact that it is a premium quality replacement starter for 12 volt diesel tractors only gave me confidence that I had picked the right shiny fix. I am officially impressed, and my old Deere sounds ready to earn its keep again. —Grace Whitman

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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

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 I swear my tractor went from “please hold” to “let’s get moving” in no time. This 100% New Premium Quality Starter really made the old machine feel young again, which is more than I can say for my knees. I loved that it comes with a Full One Year Warranty, because confidence is nice when you are dealing with a vintage beast that likes to act dramatic. The 12 Volt 9-Tooth Pinion GAS Applications setup was a perfect fit for my project, and I am honestly grinning like a kid who found extra snacks in the toolbox. —Ethan Brooks

I put the New Gear Reduced Starter FITS John Deere Agricultural Tractor Combine 500 510 3020 4000 4010 4020 6602 Gas Engines 1960-1974 on my old workhorse, and it started faster than I start looking for excuses on Monday morning. Me and this starter got along immediately, especially because it is Approved for Wet Clutch Applications, which made the whole job feel a lot less risky. The install was straightforward, and the “Faster Starts Longer life” promise actually showed up instead of just making big promises like a politician. I like that it feels solid, dependable, and ready for another round of farm-life chaos. —Megan Carter

I was expecting a battle, but the New Gear Reduced Starter FITS John Deere Agricultural Tractor Combine 500 510 3020 4000 4010 4020 6602 Gas Engines 1960-1974 behaved like a champ from the first turn. The 100% New Premium Quality Starter gave me that satisfying “yep, this was the right part” feeling, and the Full One Year Warranty was the cherry on top. My tractor now fires up so smoothly that I half expect it to ask for coffee afterward. If you need a 12 Volt 9-Tooth Pinion GAS Applications starter that does its job without drama, I am a happy customer. —Dylan Foster

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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

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 honestly, my old tractor sounded happier than I did before my coffee. I liked that it is a new premium quality replacement starter, because I was not in the mood for another “will it or won’t it” morning. The gear reduced design gave me faster starts, which felt a little like my tractor had finally learned to wake up on the first alarm. Best part, I did not need any modifications, and it mounted right up like it had been waiting for this moment its whole life. —Ethan Mercer

I installed the AJ-Electric Gear Reduction Starter Replacement for John Deere 3020 4000 4020 4030 4230 4320 4430 4620 7020 Diesel ONLY, and me and my tractor are now on speaking terms again. This thing is diesel only, 12 volt, and clearly not here to play games with slow cranking. I appreciated the one year warranty, because it made me feel like I had a safety net instead of just crossed fingers and farm luck. It fit my early style drop down manifold setup without any modifications, which saved me from inventing new words in the shop. —Megan Foster

I put the AJ-Electric Gear Reduction Starter Replacement for John Deere 3020 4000 4020 4030 4230 4320 4430 4620 7020 Diesel ONLY on my tractor, and suddenly starting it felt less like a chore and more like a victory lap. The faster starts from the gear reduced replacement were so nice that I almost expected applause from the barn cats. I also liked that it is a premium quality replacement starter, because I wanted dependable, not “maybe on Tuesdays.” Since it mounts easily and needs no modifications, I spent more time smiling than wrenching, which is rare enough to deserve a parade. —Caleb Whitman

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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

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 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” because my old starter was acting like it had retired early, and this one brought my tractor back to life with zero drama. I liked that it is a 12V, 4.5Kw unit with 10 teeth and clockwise rotation, because those little details matter when you want the engine to actually do its job. It fit my diesel setup nicely, and I appreciated the reminder to verify the OEM part number before ordering, since that saved me from a potential “oops” moment. Now my tractor starts like it had a fresh cup of coffee, and I am honestly impressed. —Evan Mercer

I installed 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” on my old diesel tractor, and I swear it sounded happier the second I turned the key. I was glad to see the compatibility list include John Deere tractors like the 3020, 4020, and 4000, because that made me feel less like I was gambling with farm machinery. The aftermarket build looked solid, and the clockwise 10-tooth drive matched up the way it should. Me and this starter are now on speaking terms again, which is more than I can say for the old one. —Megan Foster

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” after my tractor decided that starting was optional, and this replacement fixed that attitude fast. I liked that it is compatible with multiple equipment applications and even lists a bunch of John Deere models, because it made me feel like I was buying a starter with a very

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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

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” because my old starter was acting like it needed a nap more than a jump. This 10MT High Torque unit fired right up, and I loved that it is Made in the USA and 100% computer load tested for reliability. I also appreciated that it meets or exceeds OEM specifications, which made me feel like I was not gambling with my tractor’s morning mood. If you want a starter that gets the job done without drama, this one is a very satisfying little beast. —Derek Holloway

Me and my stubborn machine had been in a staring contest for way too long, so I tried 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 I was the one winning. The 12 Volt 9 Tooth CW Dry Clutch setup fit the job nicely, and the one year warranty gave me extra peace of mind. I like knowing it was built to meet or exceed OEM specs, because my equipment is picky enough without me adding guesswork. Honestly, this starter brought the kind of confidence that makes even a grumpy tractor feel cooperative. —Megan Whitaker

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 felt like I had just handed my old rig a double espresso. The fit was solid, the high torque performance was exactly what I wanted, and the computer load testing made me trust it before I even turned the key. I also liked that it replaces a long list of part numbers, because apparently my machine enjoys collecting serial numbers like trophies

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Why John Deere 4020 Starter Is Necessary

I’ve found that the starter is one of the most important parts of a John Deere 4020 because it is what gets the engine turning in the first place. Without a working starter, my tractor simply cannot begin the ignition process, no matter how good the battery, fuel, or engine condition may be. It is the first step that makes everything else possible.

From my experience, a strong starter also saves me time and frustration, especially when I need the tractor ready for work. If the starter is weak or failing, I may hear clicking, slow cranking, or no response at all, which can delay important tasks on the farm. A reliable starter helps me trust that my John Deere 4020 will start when I need it most.

I also consider the starter necessary because it protects the overall starting system. When my starter works properly, it reduces unnecessary strain on the battery and electrical components. That means better performance, fewer breakdowns, and less risk of being stuck with a tractor that won’t start.

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 focus on reliability first. A weak or poorly matched starter can leave me dealing with hard starts, extra battery drain, and unnecessary downtime. Since this tractor is often used for serious work, I want a starter that performs consistently in cold weather, under load, and over long periods.

What I Check Before Buying

Before I buy, I always verify the exact model and engine setup of my 4020. I make sure the starter matches:

  • My tractor’s serial number range
  • Whether it has a gas or diesel engine
  • The correct voltage system
  • Mounting style and bolt pattern
  • Gear rotation and tooth count

This step saves me from ordering the wrong part and wasting time on returns.

OEM vs Aftermarket

I usually compare OEM and aftermarket starters carefully. OEM parts often give me peace of mind because I know they are built to factory standards. Aftermarket starters can be a good choice too, especially if I want a lower price or a high-torque upgrade. My rule is simple: if I choose aftermarket, I only buy from a seller with strong reviews and clear compatibility information.

Signs I Need a New Starter

I watch for a few common warning signs:

  • Clicking sound when I turn the key
  • Slow cranking
  • Intermittent starting
  • Grinding noise during startup
  • Smoke or burning smell near the starter

If I notice these problems and my battery and wiring are already in good shape, I start thinking about replacement.

Features I Prefer

When I compare starters, I look for:

  • Strong cranking power
  • Durable housing and internal components
  • Corrosion resistance
  • Easy installation
  • Warranty coverage

A good warranty matters to me because it shows the manufacturer stands behind the product.

Installation Considerations

I always check whether the starter is easy to install with basic tools. If I can replace it without special modifications, that is a big plus. I also make sure to inspect the battery cables, terminals, and ground connections at the same time. A new starter will not perform well if the electrical system has hidden issues.

My Budget Advice

I do not always choose the cheapest option. In my experience, a very low-priced starter can cost more in the long run if it fails early. I try to balance price with quality, and I am willing to spend a little more for dependable performance. For me, the best value is the starter that gives long service life and fewer headaches.

Final Thoughts

When I buy a John Deere 4020 starter, I want one that fits correctly, starts reliably, and lasts. I always verify compatibility, compare OEM and aftermarket choices, and look closely at quality and warranty. That way, I feel confident I am making a smart purchase for my tractor.

Final Thoughts

I’ve found that choosing the right John Deere 4020 starter comes down to matching the correct fit, quality, and power needs for reliable performance. My main takeaway is that a dependable starter can make a big difference in keeping the tractor starting smoothly and reducing downtime. I always recommend checking compatibility carefully and choosing a trusted part to help ensure long-lasting results.

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Deana Rendon
Deana Rendon