There’s no denying that the John Deere 420 tractor is an impressive piece of machinery that packs plenty of power into a small package!

Its engine power, fuel efficiencyhydraulics system, PTO system, safety features, durability, and ease of maintenance make it one of the most reliable tractors on the market today.

While John Deere 420 tractors are typically reliable machines requiring minimal maintenance, they encounter problems from time to time, just like any other piece of equipment.

In this blog post, we’ll look at the John Deere 420 tractor, including a review of its specs and attachments, and price.

We will also highlight some common problems and tips for troubleshooting them so that you can get the most out of your John Deere 420.

John Deere 420 Review

The John Deere 420 tractor is one of the most reliable and powerful tractors on the market.

It offers a variety of features that make it ideal for farming and agricultural tasks, from mowing to hauling materials.

Let’s take a look at some of the key features of the John Deere 420 that make it so unique. 

1. Engine Power & Fuel Efficiency 

The John Deere 420 is powered by a two-cylinder, 20-horsepower engine that provides ample power for all tasks.

The engine also has excellent fuel efficiency, which keeps operating costs low. Additionally, the tractor is equipped with a fuel filter to help keep it running smoothly and efficiently

Furthermore, the tractor can reach a top speed of 15 mph (24 kph). All these features make the John Deere 420 an extremely efficient and reliable machine. 

2. Hydraulics & PTO System 

It features an adjustable seat for optimum comfort, power steering and hydraulic brakes for improved handling, and a three-point hitch for attaching implements or other attachments.

The tractor also features a power take-off (PTO) system with two speeds and reverse to help you get more done in less time.

This system allows you to easily hook up rotary mowers, front-end loaders, hay balers, and other implements. 

3. Safety Features 

The John Deere 420 is designed to be as safe as possible for farmers and their workers.

It has safety switches on cab floors and seat belts for added security while operating in rough terrain or using attachments like front-end loaders or rotary mowers.

Additionally, it has a rollover protection structure (ROPS) installed to reduce the risk of injury if something unexpected happens while operating the tractor. 

4. Durability & Maintenance Ease 

The design of the John Deere 420 ensures long-lasting use with minimal maintenance requirements thanks to its durable construction and components like heavy-duty axles, steel wheels, and cast iron hubs that can stand up to even the most challenging conditions.

Additionally, servicing this machine is simple thanks to its easily accessible parts like oil filters and spark plugs which can be changed quickly without any tools or special knowledge required.

And since this tractor is designed for long-life use, you don’t have to worry about replacing parts often. 

5. Attachments

The John Deere 420 has several attachments designed to make farm work easier.

These include loader buckets, backhoes, mower deckssnowblowers, front-end loaders, plows, rakes, and more.

Additionally, many aftermarket attachments are available for purchase that you can use on the tractor to perform specific tasks such as grading or digging trenches.

These attachments can help you get more out of your machine so you don’t have to buy additional equipment that could be expensive or difficult to use.  

John Deere 420 Problems

If you’re the proud owner of a John Deere 420 tractor, you know that it’s one of the toughest and most dependable farm equipment on the market.

But like any machine, it is susceptible to wear and tears over time.

In this paragraph, we’ll look at the ten most common problems with the John Deere 420 tractor and how to fix them. 

1. Poor Performance in Wet Weather 

If your tractor struggles to start or perform as expected when weather conditions are wet, it’s likely due to a spark plug issue.

To fix it, replace the spark plugs and use the ones John Deere recommended for your model.

2. Engine Overheating 

The John Deere 420 is built with a durable cooling system, but it can still overheat if it isn’t maintained properly.

To prevent this, check the radiator for clogs, inspect the hoses for cracks or holes, and ensure the fan belt is in good condition.

3. Grinding Gears 

If you’re hearing a grinding noise when shifting gears, it’s likely due to worn synchronizers or failed bearings in the gearbox.

You’ll need to replace the old parts with new ones to fix this issue. 

4. Worn Out Battery Cables 

The battery cables can suffer from corrosion over time, leading to poor performance or complete failure of your tractor.

Inspecting and replacing these cables as needed should help keep things running smoothly. 

5. Clogged Fuel Filter

Over time, dirt and debris can accumulate in your fuel filter and cause clogging. This can lead to poor performance or even engine shutdowns if left unchecked.

To fix this problem, remove and clean the fuel filter, or replace it if necessary.

6. Leaky Radiator Hoses

A leaky radiator hose can cause significant overheating issues for your tractor, so it’s crucial to inspect these hoses regularly for signs of wear or damage.

If you find any leaks, replace the hoses immediately to keep your John Deere 420 running at its best.

7. Faulty Starter Motor

The starter motor is responsible for turning over your engine when you turn on the ignition key. If it fails, you won’t be able to start your engine!

Inspecting this part will prevent major issues down the line; if necessary, have an experienced mechanic test out your starter motor every couple of months or so for maximum reliability.

8. Worn Out Alternator Belts

Over time, alternator belts can become brittle and cracked from constant use—this will cause them to slip off their pulleys during operation, resulting in decreased performance or even engine shutdowns!

Have an experienced mechanic inspect these belts regularly for signs of wear; replacing them as needed will help ensure maximum efficiency from your engine every time you start up!

9. Failed Water Pump Seals

A leaking water pump seal can be incredibly dangerous if left unchecked–it could lead to overheating issues which may require expensive repairs down the road!

You need to inspect these seals periodically; replacing them as needed will help ensure optimal cooling system performance each season!

10. Clogged Air Filters

Clogged air filters are incredibly common–they restrict airflow into the engine, leading to decreased performance and fuel consumption!

Cleaning out these filters regularly (or replacing them outright) will ensure that your engine is getting enough air at all times, resulting in better overall performance!

So by taking proactive measures such as inspecting parts regularly and replacing worn-out components when necessary, you’ll be able to keep your machine running like new for years to come!

John Deere 420 Maintenance

The John Deere 420 tractor is an impressive piece of machinery, providing plenty of power and capability to handle various jobs.

But like any machine, it needs regular maintenance to keep it running at its best.

To help you make sure your John Deere 420 is always in top condition, here are seven best practices to follow for regular maintenance. 

1. Check the Oil Level Regularly 

One of the most essential maintenance tasks for your John Deere 420 is checking the oil level regularly.

You should check the oil level at least once a month or more frequently if using your tractor regularly.

Make sure to use the right type and grade of oil as specified in the owner’s manual. 

2. Clean Air Filters Regularly 

The air filters on your John Deere 420 should also be checked and cleaned regularly.

This will help keep dirt, dust, and debris from entering the engine and causing major damage over time.

Make sure to clean the primary and secondary air filters consistently according to the manufacturer’s guidelines. 

3. Keep the Battery Charged 

Your John Deere 420 has a 12-volt battery that needs to be kept charged to run efficiently.

Always plug in or charge your battery when not in use, so you don’t find yourself with a dead battery when you need it most.

Additionally, check all electrical connections periodically for signs of corrosion or wear and tear.  

4. Replace Spark Plugs Annually  

Spark plugs should be replaced annually on your John Deere 420 tractor to ensure optimal engine performance.

Replacing spark plugs can be done relatively easily by following instructions in your owner’s manual or online resources like YouTube tutorials.

5. Lubricate Moving Parts  

It’s important to lubricate all moving parts on your John Deere 420 regularly to prevent excessive wear and tear due to friction between surfaces over time.

This could include parts such as springs, pins, linkages, bearings, joints, etc., depending on what model tractor you have and what kind of work you plan on doing with it.

Refer to your owner’s manual for specific lubrication requirements for each part of your tractor model before applying any lubricant.  

6. Check Belts Regularly  

Belts can become worn down over time due to frequent use or exposure to extreme temperatures or weather conditions.

So make sure you check them regularly for signs of wear and tear or fraying edges that indicate they may need replacing soon.

Always refer to the owner’s manual for specific belt replacement instructions before attempting any repairs yourself!   

7. Check Tire Pressure Monthly

Finally, check tire pressure monthly, so each tire is inflated correctly according to manufacturer specifications found in the owner’s manual.

Proper tire inflation can extend tire life significantly while also improving overall performance levels from your tractor’s engine by reducing drag caused by under-inflated tires over long distances or during heavy loads!  

Taking care of regular maintenance tasks for your John Deere 420 tractor doesn’t have to be complicated—follow these seven best practices outlined above!

 From checking oil levels and cleaning air filters regularly to replacing spark plugs annually and checking tire pressure monthly—these simple steps will ensure that your tractor remains running while maximizing its lifespan!

John Deere 420 Price

The John Deere 420 is an iconic piece of agricultural machinery that continues to provide farmers with reliable performance.

When it was first released in 1983, the John Deere 420 cost around $6,489.

Since then, its price has gradually increased; today, it typically sells for around $7-8K USD, depending on condition and location.

On average, it will last anywhere from 10-15 years before needing any major repairs or replacements making it an excellent investment if you use it often or need something reliable that won’t require too much maintenance over time.  

John Deere 420 Specs

Let’s take a deep look at the specs of the John Deere 420:

John Deere 420 Production

Manufacturer John Deere
Garden tractor Built in Horicon, Wisconsin, USA
Original price $6,489 (1983 )
$7,700 (1992 )

John Deere 420 Engine specs

The B48G was the original engine on the Deere 420, used through the 1986 model year.

Onan B48G gasoline 2-cylinder air-cooled horizontal-shaft opposed-twin
Displacement 781 cc

47.7 ci

Bore/Stroke 3.25×2.875 inches

83 x 73 mm

Power 20 hp

14.9 kW

Air cleaner foam and paper
Compression 7.0:1
Rated RPM 3500
Idle RPM 1000-3450
Starter volts 12
Oil capacity 1.75 qts

1.7 L

John Deere 420 Mechanical specs

Chassis: Two-wheel drive
Steering: power
Brakes: wet disc
Differential lock mechanical rear
Differential mechanical drum brakes
Open operator station.

John Deere 420 Transmission specs

Transmission Sundstrand Series 15 Model 90
Type shaft-driven hydrostatic
Gears infinite forward and reverse (2-range)
Oil capacity 7.5 qts

7.1 L

Oil type JD Hy-Gard

John Deere 420 Electrical specs

Ground negative
Charging system alternator
Charging amps 20
Battery volts 12
Battery Group BCI 22F

John Deere 420 Power Take-Off (PTO) specs

Rear PTO independent Opt
Clutch electric
Rear RPM 2000
Front PTO independent
Clutch electric
Front RPM 3400

John Deere 420 Taylor hitch specs

Rear Type 0 Opt
Rear lift 640 lbs

290 kg

John Deere 420 Dimensions

Wheelbase 52 inches

132 cm

Length 77 inches

195 cm

Width 51.5 inches

130 cm

Height 47.5 inches

120 cm

Front tread 36 inches

91 cm

Rear tread 32/38.6 inches

81/98 cm

John Deere 420 Weight

Shipping 993 lbs

450 kg

Max front axle 1060 lbs

480 kg

Max rear axle 1800 lbs

816 kg

John Deere 420 Tires Specs

Ag front 4.80×4.00-8
Ag rear 23×10.50-12
Lawn/turf front 18×8.50-8
Lawn/turf rear 26×12.00-12

John Deere 420 Attachments

Let’s look into the John Deere 420 attachments.

 John Deere 420 Mower Deck specs

Type: John Deere M01012
Cutting width: 50 inches

127 cm

Total width 68 inches

172 cm

Weight: 226 lbs

102 kg

Cut height: 1.5 to 6 inch

3 to 15 cm


Type: John Deere 
Cutting width: 60 inches

152 cm

Total width 72.5 inches

184 cm

Weight: 367 lbs

166 kg

Cut height: 2 to 7 inch

5 to 17 cm

John Deere 420 Loader specs

Loader weight 500 lbs

226 kg

Height (to pin) 73 inches

185 cm

Clearance, dumped bucket 53.25 inches

135 cm

Dump reach 22 inches

55 cm

Dump angle 50°
Reach at ground 43.75 inches

111 cm

Rollback angle 20°
Breakout force (bucket) 725 lbs

328 kg

Lift to full height (at pin) 500 lbs

226 kg

Bucket capacity 0.21 cu yd

0.2 cu m

  0.24 cu yd

0.2 cu m

Bucket width 45,54 inches

11567 cm

John Deere 420 Snow blower specs

Type: front-mount John Deere 0062M
Width: 46 inches width

116 cm

Clear height 12 inches

30 cm

Weight 310 lbs

140 kg


Type: front-mount John Deere 47 2752M
Width: 47 inches width

119 cm

Clear height 23 inches

58 cm

Weight 400 lbs

181 kg

John Deere 420 Blade specs

Type: front-mount John Deere 0042M
Width: 54 inches width

137 cm

Height 18 inches height

45 cm

Lift 12 inches lift

30 cm

Cut 3.5 inches cut

8 cm

Weight 184 lbs

83 kg


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