John Deere A Repair Guide: Parts, Diagrams, Manuals

The John Deere A is a classic two-cylinder row-crop tractor built from 1934 to 1952 in Waterloo, Iowa, and it became Deere’s first true row-crop tractor after the GP. For owners in the USA and Canada, this guide focuses on practical repair, troubleshooting, maintenance, parts lookup, diagrams, manuals, and realistic DIY limits so it can be published directly as a WordPress post.

Even though the John Deere A is an older farm tractor rather than a modern lawn tractor, the same owner-first logic still works: start with the symptom, confirm the exact model and serial number, then match the right parts and procedures before ordering anything. That matters on this model because Deere built multiple A variants and made serial-number-based changes over the production run, including engine and transmission updates.

John Deere A model overview

The John Deere A belongs to Deere’s Two-Cylinder Letter Series and was sold as a row-crop tractor, with variants such as the AR, AO, AW, and AN built for different front axle and application needs. Standard mechanical features include a 5.1 L two-cylinder all-fuel engine, two-wheel drive, manual steering, mechanical expanding shoe brakes, and a transmission PTO rated at 540 rpm.

Typical John Deere A use is heavier than the homeowner lawn and garden machines your other guides cover. It was designed for field work, belt work, and general farm chores, so owners today usually use it for vintage tractor work, acreage jobs, parade use, and light utility tasks where simple mechanical systems are a benefit.

General overview of the John Deere A

In Deere’s lineup, the John Deere A sat above the smaller B and below later replacements such as the 60, with claimed drawbar power around 18 hp and belt power around 24 hp. Over its production life, Deere changed major details by serial number, including an engine increase from 309 to 321 cubic inches around serial number 488000 and a transmission change from four forward speeds to six around serial number 499000.

The main systems owners usually work on are:

• Engine and fuel system, including the carburetor, magneto or distributor, governor, oil filter, air cleaner, and cooling system.

• Clutch, transmission, brakes, differential, and final drive components that affect movement and safe stopping.

• PTO, belt pulley, and power lift systems on tractors still used for vintage implements.

• Electrical and ignition components on tractors converted to battery ignition or electric start, even though many earlier units remain magneto-based.

Common service and repair parts John Deere A owners regularly buy include spark plugs, carburetor kits, sediment bowl parts, air cleaner service items, oil and coolant-related parts, clutch facings, brake parts, governor components, radiator hoses, and ignition tune-up parts. Because these tractors span many years and serial breaks, the correct part often depends on whether the tractor is styled or unstyled and where it falls in the serial range.

John Deere A troubleshooting approach

The best way to troubleshoot a John Deere A is to work from the visible symptom rather than guessing at a single bad part. On a tractor this old, poor running can come from ignition, carburetion, stale fuel, stuck valves, oiling issues, or basic adjustment problems, so changing parts blindly usually wastes time and money.

Main symptom categories for the John Deere A include:

• Hard starting or no-start.

• Rough running, weak power, or misfiring.

• Overheating, smoke, or oil consumption.

• Clutch, transmission, or drive problems.

• Brake or steering issues.

• PTO, belt pulley, or power lift faults.

• Vibration, knocking, or abnormal mechanical noise.

John Deere A emergency repair needs

Some John Deere A problems need immediate attention because they affect safe operation or can quickly damage hard-to-find original parts. Fuel leaks, low oil pressure, overheating, brake failure, loose flywheel concerns, and severe knocks should move the tractor out of service until inspected.

John Deere A starting issues

A starting problem usually shows up as no fire at the plugs, weak or inconsistent spark, wet plugs, or an engine that turns but will not catch. On the John Deere A, this matters because repeated cranking and over-fueling can foul plugs, wash cylinders, and hide the real cause.

Common causes:

• Magneto or distributor timing issues.

• Fouled or worn spark plugs.

• Fuel delivery restriction at the tank, sediment bowl, or carburetor.

• Sticking valves or incorrect tappet adjustment.

• Weak compression from worn internal parts.

Basic checks:

1. Confirm fresh fuel is reaching the carburetor and the shutoff is open.

2. Check for a strong spark at both plugs before touching the carburetor settings.

3. Inspect the plugs, clean or replace if fouled, and set the gap to spec for the plug used.

4. If compression seems uneven, inspect for sticking valves through the tappet area.

5. Verify magneto or distributor timing before ordering ignition parts.

John Deere A running and power problems

When a John Deere A starts but runs rough, misses under load, or lacks pulling power, owners usually notice hunting, popping, black smoke, or a tractor that only runs well at one throttle setting. These symptoms matter because they often point to tune-up, fuel, or governor issues that can usually be corrected before major teardown is needed.

Common causes:

• Carburetor adjustment out of range.

• Governor linkage wear or incorrect adjustment.

• Dirty fuel or restricted flow from the tank and sediment bowl.

• Incorrect ignition timing.

• Valve leakage or sticking.

Basic checks:

1. Clean the fuel path from tank to carburetor and check flow into a clean container.

2. Inspect and clean the air cleaner system as described in the operator instructions.

3. Set ignition condition first, then make carburetor adjustments in small steps.

4. Watch governor response at different throttle openings.

5. If the miss remains under load, move to a compression and valve check.

John Deere A vibration and noise

Vibration, knocking, or harsh mechanical noise on a John Deere A can come from normal two-cylinder pulse being mistaken for a fault, but a sudden change in sound should always be investigated. Heavy knocks, clutch chatter, and drivetrain noise can indicate wear that becomes more expensive if the tractor keeps working.

Common causes:

• Loose or worn clutch parts.

• Worn bearings or incorrect internal clearances.

• Flywheel or drivetrain looseness.

• Worn brake or axle components.

• PTO or belt pulley wear.

Basic checks:

1. Compare the noise at idle, under load, and with the clutch engaged or disengaged.

2. Isolate whether the sound is engine, clutch, transmission, brake, or PTO related.

3. Inspect visible clutch and brake hardware for looseness or wear.

4. Stop operation if a knock increases with load or oil pressure is low.

5. Do not continue running a tractor with suspected bearing damage.

John Deere A overheating and leaks

Overheating on a John Deere A shows up as coolant loss, boiling, heat smell, or falling performance after warm-up. Oil and fuel leaks matter just as much because they create fire risk, attract dirt, and can damage internal parts through low lubrication or contaminated fuel delivery.

Common causes:

• Low coolant or restricted cooling passages.

• Fan or cooling system problems.

• Excessively lean running or timing issues.

• Engine oil level or pressure problems.

• Fuel leaks at the sediment bowl, line, or carburetor.

Basic checks:

1. Confirm coolant level and inspect for obvious leaks before starting.

2. Watch the oil pressure gauge and stop if pressure falls below the acceptable range.

3. Inspect the fan and cooling system condition.

4. Look for fuel seepage around the sediment bowl and carburetor body.

5. Clean heavy dirt and oil buildup so air and heat can leave the engine properly.

John Deere A transmission and drive problems

Drive complaints on the John Deere A usually appear as clutch slipping, grinding shifts, a tractor that creeps, weak pull, or brake issues on one side. These faults matter because they reduce control and can turn a routine adjustment into a larger transmission or clutch repair if ignored.

Common causes:

• Clutch out of adjustment or worn facing.

• Transmission wear or damage.

• Brake adjustment or lining problems.

• Differential or axle wear.

• Incorrect or neglected lubrication.

Basic checks:

1. Inspect clutch engagement feel before assuming internal transmission damage.

2. Check brake action on both sides for equal response.

3. Listen for gear noise that changes by gear selection.

4. Confirm lubrication service has not been skipped.

5. Stop using the tractor for heavy pull work if slipping or grinding gets worse.

John Deere A electrical and ignition problems

Electrical issues on a John Deere A vary because some tractors are magneto equipped while others have distributor and electric-start systems. Owners often see weak spark, no charge, dead battery, poor lighting, or unreliable starting after conversion work or years of storage.

Common causes:

• Worn ignition components.

• Poor wiring connections or bad grounds.

• Weak battery on electric-start tractors.

• Charging system faults.

• Incorrectly mixed parts from different serial ranges.

Basic checks:

1. Identify whether the tractor uses a magneto or battery ignition before testing parts.

2. Clean and tighten visible wiring and grounds.

3. Test battery voltage and cable condition on electric-start machines.

4. Check charging output after the tractor starts.

5. Use the tractor serial number before buying switches, coils, or charging parts.

DIY or dealer?

The line on a John Deere A is usually simple: basic maintenance, tune-up work, and many bolt-on repairs are realistic for a careful owner, while internal engine, flywheel, clutch rebuild, and transmission work are better left to experienced vintage tractor mechanics unless the owner already has the tools and knowledge.

Good DIY jobs on a John Deere A

• Spark plugs and ignition tune-up parts.

• Sediment bowl cleaning and basic fuel line service.

• Air cleaner servicing.

• Engine oil checks and routine lubrication.

• Cooling system checks, hose replacement, and leak tracing.

• Brake and clutch inspection or basic adjustment where covered by the manual.

Advanced DIY or dealer jobs on a John Deere A

• Carburetor rebuilding and governor correction if the tractor has multiple drivability issues.

• Valve work, tappet adjustment diagnosis, and stuck-valve correction.

• Clutch overhaul and flywheel-related repair.

• Transmission, differential, and axle work.

• Internal engine repair for low compression, bearing wear, or oil pressure problems.

Skill guide for John Deere A owners

• Beginner: fluids, lubrication, spark plugs, visual inspection, basic fuel cleaning.

• Intermediate: carburetor service, brake adjustment, ignition timing checks, cooling system repairs.

• Advanced: clutch rebuilds, valve and compression work, transmission repair, bearing work.

John Deere A parts needed, OEM vs aftermarket, and what to check before ordering

Before ordering John Deere A parts, gather the full model designation, the tractor serial number, whether it is styled or unstyled, whether it uses a magneto or distributor, and any known engine or ignition conversions. This is especially important because Deere made serial-number changes and the A family also included variant tractors that do not always share the same parts.

Use the serial plate and your old parts together whenever possible. On a tractor this old, previous owners may have swapped carburetors, ignition systems, seats, charging parts, or wheels, so the original catalog alone does not always tell the full story.

OEM parts are the safer choice for fit-sensitive, serial-sensitive, and safety-related items such as ignition pieces matched to original systems, clutch parts, brake parts, and hard-to-fit cooling or driveline components. Aftermarket parts can be fine for some tune-up items, filters, hoses, wiring consumables, and cosmetic replacements if the supplier cross-references them correctly to the exact model and serial range.

John Deere A diagrams and manuals

The best places to find John Deere A parts diagrams and manuals are the official Deere parts catalog, official operator-manual sources, and reputable vintage tractor parts suppliers that organize parts by model family. Use manuals for procedures and lubrication points, and use parts diagrams for serial-break verification and exploded views before you order.

Key sources:

• John Deere Parts Catalog — official Deere lookup for parts diagrams and part-number verification.

• John Deere operator manuals portal — official-manual access point for operator and technical publication lookup.

• Jensales John Deere A operator manual PDF — useful for operating instructions, lubrication, adjustment topics, and maintenance guidance for the Model A.

• Steiner Tractor John Deere Model A parts page — helpful for seeing common aftermarket replacement categories for older A tractors.

How to locate John Deere A serial and engine information

These numbers matter because John Deere A tractors changed over the years and many replacement parts are only correct within certain serial ranges. The serial number also helps separate styled from unstyled tractors and confirm which transmission and engine generation you are dealing with.

Steps to locate the numbers:

1. Look for the tractor serial number plate on the left side of the tractor, above the flywheel.

2. Clean the plate carefully so the stamped number is readable.

3. Compare the number with a reliable serial chart to estimate year and production range.

4. Inspect the ignition system to identify whether the tractor has a magneto or distributor, since this affects tune-up parts.

5. Record any carburetor or magneto tag numbers separately before ordering repair kits.

Buying John Deere A parts online and in stores

The best buying strategy for John Deere A parts is to confirm the old part, serial number, and system type first, then use diagrams or a trusted supplier before placing the order. That extra step is worth it on vintage Deere equipment because the wrong carburetor kit, ignition part, or brake component can cost more in downtime than the part itself.

• Online: use the Deere catalog for exploded diagrams and official references, then cross-check with a vintage supplier if the part is discontinued or listed by serial break.

• Dealer counter: best for parts-catalog help, superseded OEM numbers, and tricky serial-specific questions.

• Retail stores: acceptable for generic consumables such as some plugs, battery cables, shop supplies, and fluids, but only when the packaging clearly matches your tractor’s actual setup.

Useful links:

• John Deere Parts Catalog

• Steiner Tractor John Deere Model A page

• Cross Implement John Deere manuals

John Deere A fitting guide for common parts

These are high-impact jobs that solve many common owner complaints without moving straight into major teardown work. Always park safely, shut the engine down, and let hot components cool before starting.

John Deere A spark plug replacement

A fresh set of plugs can cure weak starting, misfire, and uneven running when the rest of the ignition system is serviceable.

1. Remove both spark plug leads and clean around the plug bases first.

2. Remove the plugs and compare color, deposits, and wetness to what the engine has been doing.

3. Install the correct replacement plugs for your exact setup and set the gap to the proper specification.

4. Thread in by hand first to avoid head damage, then tighten correctly.

5. Refit the leads securely and test start the tractor.

John Deere A sediment bowl and fuel flow service

This job fixes many no-start and rough-running complaints caused by old fuel, water, or restricted flow.

1. Shut off the fuel supply at the tank.

2. Remove the sediment bowl carefully and inspect for rust, dirt, or water.

3. Clean the bowl and screen, and replace the gasket if damaged.

4. Reassemble, reopen the shutoff, and check for leaks.

5. Verify steady fuel flow before blaming the carburetor.

John Deere A air cleaner service

Air cleaner maintenance helps prevent rich running, smoke, and poor power.

1. Locate the air cleaner assembly and remove the serviceable lower section as directed in the manual.

2. Clean out sludge, dust, and oil contamination.

3. Refill or service the unit exactly as specified for the tractor’s design.

4. Reinstall securely and inspect intake connections for leaks.

5. Test engine response under load after service.

John Deere A tappet and stuck-valve inspection

This check matters when the tractor has uneven compression, backfiring, or signs of a valve not closing correctly.

1. Remove the tappet cover on the front of the cylinder head.

2. Turn the flywheel until all tappets are free, as described in the operator manual.

3. Inspect for sticking valves and apply penetrating fluid or kerosene only as described in vintage service guidance.

4. Adjust tappets only if you understand the procedure and clearances.

5. If a valve repeatedly sticks or compression remains poor, move to advanced repair rather than forcing continued use.

Maintenance to prevent John Deere A problems

Regular maintenance prevents more John Deere A failures than most owners expect because old fuel systems, sticky valves, weak ignition parts, and neglected lubrication cause many of the classic complaints. The operator manual repeatedly emphasizes daily attention, proper oiling, and using the serial number when ordering repair parts.

Focus areas:

• Starting reliability — keep ignition parts clean and fuel delivery unrestricted.

• Running quality — maintain the air cleaner and carburetor settings only after ignition is confirmed good.

• Overheating and fire prevention — repair oil and fuel leaks early and keep the engine exterior clean.

• Drive performance — inspect clutch, brakes, and transmission behavior before heavy work.

• Long-term engine life — watch oil pressure closely and do not run with abnormal knocks or sticking valves.

John Deere A maintenance schedule

Because the John Deere A is a vintage tractor, the maintenance rhythm is driven more by inspection, lubrication, and seasonal storage practice than by the modern lawn-tractor style hour schedule. The official instructions emphasize daily attention, lubrication-chart intervals, oil checks, cooling system care, and periodic servicing of bearings, steering gears, and related fittings.

Daily or before each use on a John Deere A

• Check engine oil level before operation.

• Inspect fuel supply and look for leaks.

• Check coolant and general cooling-system condition.

• Verify brakes, steering response, and safe controls.

• Look for loose hardware and obvious wear points.

Every 8 to 10 hours on a John Deere A

• Watch oil pressure during operation and correct abnormal readings quickly.

• Check for excessive oil consumption over about 10 hours of use.

• Grease fittings according to the lubrication chart where the tractor’s usage requires it.

Every 25 hours

• Service lubrication points called out in the lubrication chart.

• Inspect air cleaner condition and clean as needed.

• Check clutch and brake action for early adjustment needs.

Every 50 hours or yearly

• Review transmission and steering gear lubrication condition.

• Inspect cooling system and fan condition.

• Recheck ignition timing and plug condition if starting or running quality has changed.

Longer interval or as needed

• Repack the front fan bearing after about two years of normal operation.

• Inspect valve condition, tappet clearance, and internal wear if compression or running quality drops.

• Prepare properly for storage during long idle periods.

Seasonal checklist

• Spring: fresh fuel, ignition check, oil-level check, lubrication round, cooling inspection.

• Mid-season: watch oil pressure, clean the air system, inspect clutch and brakes, correct leaks early.

• Fall or storage: clean the tractor, protect the fuel system, inspect coolant, and follow storage guidance before long lay-up.

Repair, upgrade, or replace?

For a John Deere A, repair usually makes sense when the tractor is structurally sound, complete, and only needs tune-up work, clutch/brake attention, cooling repairs, or moderate engine correction. Upgrade only when a change improves reliability without hurting safe operation, and replace the tractor only when the cost of core engine, clutch, transmission, and missing-original-parts work exceeds the value of the machine for your intended use.

Repair if…

• The tractor is complete and starts or nearly starts with reasonable compression.

• Problems are limited to fuel, ignition, cooling, brakes, or adjustments.

• You can still source the parts you need through Deere references or vintage suppliers.

Upgrade if…

• Wiring, charging, or lighting improvements are needed for safer occasional use.

• You need better reliability from consumable parts while keeping correct fit.

• A documented update solves a repeat failure without creating new fitment issues.

Replace if…

• The tractor has major internal engine damage plus transmission or clutch failure.

• Key castings, serial plates, or multiple major systems are missing.

• The machine no longer matches your work needs and would require constant heavy repair.

John Deere A troubleshooting FAQ

1. Why will my John Deere A not start?

The usual causes are no spark, poor fuel flow, fouled plugs, stuck valves, or incorrect timing. Start by checking spark first, then confirm fuel reaches the carburetor, and only then move into compression or valve diagnosis.

2. Why does my John Deere A have spark but still not fire?

A visible spark does not always mean the timing and fuel mix are correct. Check plug condition, timing, fuel delivery, and whether a valve is sticking before assuming the carburetor needs a full rebuild.

3. Why does my John Deere A only run with the choke partly on?

That usually points to a lean condition caused by restricted fuel flow, dirt in the carburetor, or an intake-side issue. Clean the fuel path first because many vintage carburetor complaints begin upstream at the sediment bowl or tank outlet.

4. Why is my John Deere A running rough at idle?

Rough idle often comes from ignition wear, carburetor adjustment drift, governor issues, or uneven compression. Tune the ignition side first because carb adjustments rarely fix weak spark or valve sealing problems.

5. Why does my John Deere A miss under load?

A load-related miss commonly shows up when ignition timing is off, fuel flow is restricted, or compression is weak. If the tractor idles fairly well but misses when pulling, compare spark quality and fuel flow before going deeper.

6. Why is my John Deere A down on power?

Loss of power can come from poor carburetor adjustment, governor problems, ignition timing error, or engine wear. Serial-number changes also matter on this tractor, so make sure the machine has the right matched components for its configuration.

7. Why is my John Deere A backfiring?

Backfiring usually points to timing, valve, or mixture problems. Check ignition timing and inspect for sticking valves before making large carburetor adjustments.

8. Why are the spark plugs fouling on my John Deere A?

Plug fouling can come from rich running, oil consumption, weak ignition, or a tractor that does a lot of short-run operation. Read the plug deposits, then match that evidence to the fuel, oil, and ignition condition rather than just replacing plugs repeatedly.

9. What spark plugs does a John Deere A use?

Plug choice can vary by fuel setup, ignition system, and production details, so it is safest to confirm against your exact tractor and current setup before ordering. TractorData lists Champion 8 for related AR styled engine information, but owners should still verify by serial and actual configuration.

10. What is the correct spark plug gap for a John Deere A?

A 0.030 inch spark plug gap appears in related Deere two-cylinder engine specification data. Even so, confirm the exact plug and ignition setup on your tractor because converted or substituted ignition parts may require different guidance.

11. Why is my John Deere A overheating?

Low coolant, dirty cooling passages, fan problems, poor tune, or an engine working too hard can all raise temperature. Stop using the tractor until you confirm coolant and oil condition because overheating and low oil pressure together can cause major engine damage.

12. Why is my John Deere A leaking fuel?

Fuel leaks usually show up at the sediment bowl, shutoff, fuel line, or carburetor. Fix these quickly because leaking fuel is both a fire risk and a sign that dirt or worn sealing parts may also be affecting fuel delivery.

13. Why is my John Deere A using too much oil?

The manual notes that if oil pressure is correct but the engine still uses excessive oil in about 10 hours, the connecting rod bearings should be examined and adjusted as instructed. Oil use can also rise with worn rings, valve issues, or incorrect oil grade.

14. What oil pressure should a John Deere A show?

The operator manual states the oil pressure gauge should register between “M” and “H” when the engine is hot and the idle speed is 1075 rpm. If pressure drops below the low mark, the tractor should not stay in service until the cause is found.

15. Why is my John Deere A making a knocking sound?

A knock can come from bearings, internal wear, clutch issues, or another rotating component. Because this tractor has large, heavy moving parts, a new knock should be treated as a stop-and-inspect issue rather than normal old-tractor noise.

16. Why is my John Deere A clutch slipping?

Clutch slipping usually means the clutch needs inspection, adjustment, or replacement of worn parts. Keep using it under load and the heat can damage additional parts that are harder to source.

17. Why are the brakes weak on my John Deere A?

Weak brakes often come from wear, poor adjustment, contamination, or internal brake component problems. Since the A uses mechanical expanding shoe brakes, equal response on both sides matters for safe control.

18. Why is my John Deere A hard to steer?

Manual steering effort rises with poor lubrication, worn front-end components, or tire and alignment issues. Check steering gear lubrication and front spindle service points before assuming a major mechanical failure.

19. Why does my John Deere A grind when shifting?

Some gear noise is expected on an unsynchronized transmission, but worsening grinding can mean clutch drag, poor technique, or internal wear. If shifting quality suddenly changes, inspect clutch function first.

20. How many forward gears does a John Deere A have?

The John Deere A used a four-speed unsynchronized transmission in general model data, while the operator-manual history notes that tractors from serial number 499000 changed from four forward speeds to six. That is why the serial number matters before ordering transmission parts or judging whether a tractor is “correct.”

21. Why does my John Deere A PTO not work properly?

PTO trouble can come from linkage issues, internal wear, clutch-related problems, or damage from old implement use. Isolate whether the problem is engagement, noise, or load-carrying ability before opening anything up.

22. Why is my John Deere A governor hunting?

Governor hunting usually means the engine is constantly over-correcting for load or throttle position. Before adjusting linkage, make sure ignition quality and fuel flow are stable, because the governor often reacts to other faults rather than causing them.

23. Why do the valves stick on a John Deere A?

The manual says many cases of sticking valves are traceable to lubricating oil that is too heavy, which forms gum deposits on the valve stems. Correct oil choice and regular use help reduce that problem.

24. How do I free a stuck valve on a John Deere A?

The operator manual says to remove the tappet cover, squirt kerosene on the valve stems, and turn the flywheel until the valves loosen. If the problem repeats, the tractor likely needs deeper valve-guide or oil-related correction rather than repeated quick fixes.

25. What is the tappet clearance on a John Deere A?

The manual states that backing off the adjusting screw by one-third turn gives 0.020 inch valve clearance. Only make this adjustment if you are certain the engine is positioned correctly and you understand the procedure.

26. Why is my John Deere A serial number so important?

The serial number identifies production year, major design changes, and many parts differences. Deere changed engines, transmissions, and other details over time, so ordering by “Model A” alone is risky.

27. Where is the serial number on a John Deere A?

TractorData says the serial number plate is on the left side of the tractor above the flywheel. Clean that area carefully and record the full number before looking for manuals or diagrams.

28. Is the John Deere A a good DIY tractor?

Yes, for owners comfortable with vintage mechanical systems, because the tractor is fundamentally simple and well documented. It is still easy to get in too deep on clutch, flywheel, transmission, and internal engine work, so basic jobs and disciplined diagnosis are the better DIY lane.

29. Where can I find John Deere A parts diagrams?

The official Deere parts catalog is the best starting point for diagrams and part-number confirmation. After that, vintage suppliers can help when a genuine part is discontinued or when you need visual category browsing.

30. Where can I find a John Deere A operator’s manual?

A Deere manuals portal is available online, and a Model A operator manual reproduction PDF is also available through Jensales. For working owners, the operator manual is essential because it covers lubrication, adjustments, timing, cooling, and storage topics.

31. Is the John Deere A styled or unstyled?

Both versions exist across the model’s production run. The manual history notes appearance changed in 1939 with the styled look, so serial range and appearance both matter when identifying parts.

32. What engine does a John Deere A have?

TractorData lists the John Deere A with a John Deere 5.1 L two-cylinder all-fuel engine. The operator-manual material also notes displacement changes during production, so exact cubic inches depend on serial range.

33. What fuel tank size does a John Deere A have?

TractorData lists a 14 gallon main fuel tank and a 1 gallon auxiliary fuel tank. Confirm the tank arrangement on your actual tractor because restoration and long-term modifications can change what remains installed.

34. How heavy is a John Deere A?

TractorData lists the John Deere A at 3,783 pounds. Weight matters when towing, storing, or selecting jacks and stands for repair work.

35. Should I buy OEM or aftermarket John Deere A parts?

Use OEM references whenever fit, safety, or serial-range accuracy matters, especially for ignition, clutch, brake, and hard parts. Aftermarket is often acceptable for some consumables and common restoration items when the supplier clearly cross-references to your exact setup.

John Deere A serial number identification chart