The John Deere S140 Lawn Tractor stands out as one of the most reliable and easy-to-maintain machines in the 100 Series lineup. Built in Greenville, Tennessee, this lawn tractor combines durability, user comfort, and proven performance. With its powerful 22-hp Briggs & Stratton 44N677 V-twin engine, 48-inch Edge™ mower deck, and hydrostatic transmission with side-by-side pedals, the S140 is a perfect choice for homeowners who want professional-quality mowing results without hassle.
Overview and Key Features
| Feature | Specification |
|---|---|
| Engine Power | 22 hp (16.4 kW) |
| Engine Model | Briggs & Stratton 44N677 (M44), V-Twin |
| Displacement | 724 cc (44.2 cu in) |
| Fuel Capacity | 2.4 gal (9.1 L) |
| Transmission Type | TLT200 hydrostatic, 2WD |
| Deck Width | Edge™ mower deck, 48 in (122 cm) |
| Cutting Height | 1 to 4 in (2.5–10.2 cm), 13 positions |
| Top Speed (Forward) | 5.5 mph (8.9 km/h) |
| Top Speed (Reverse) | 3.2 mph (5.2 km/h) |
| Weight | 468 lb (212 kg) |
| Warranty | 2 years or 120 hours of full coverage |
The tractor’s one-piece welded steel frame, cast-iron front axle, and powder-coated finish make it exceptionally resistant to wear and corrosion. The spring-assisted lift lever and comfortable high-back seat ensure easy operation during long mowing sessions.
When to Change Oil on a John Deere S140
Oil changes are one of the most important aspects of maintaining the John Deere S140 Lawn Tractor. The manufacturer recommends changing the engine oil every 50 hours of operation or once per year, whichever comes first.
The best time to change the oil is in the fall, right after the last mowing of the season. Doing so removes contaminants and prevents corrosion during winter storage. If you missed it in the fall, it’s fine to change oil in the spring before the first startup.
Recommended Engine Oils
- John Deere Turf-Gard 10W-30 (TY22029) — Original John Deere engine oil for all-season protection.
- John Deere Plus-4 10W-30 (TY22041) — Suitable for a wide range of temperatures.
- Alternatives: Any high-quality 10W-30 oil meeting API SJ, SL, SM, or SN standards.
Oil Capacity: About 1.9 liters (2.0 U.S. quarts)
Oil Filter
It’s essential to replace the oil filter with each oil change.
- Part Number: AM125424
- Equivalent options: Briggs & Stratton 492932S, Stens 120-485, Fleetguard LF3409
Air, Fuel, and Spark Plug Replacement
Clean filters and a properly functioning spark plug are crucial for smooth operation and long engine life.
| Component | Part Number | Recommendation |
|---|---|---|
| Air Filter | GY21435 | Replace every season |
| Pre-Cleaner Foam Insert | GY21437 | Check and clean regularly |
| Fuel Filter | AM116304 | Replace every 100 hours or two seasons |
| Spark Plug | Champion RC12YC / NGK BCPR5ES (AM125424) | Replace once per year |
A fresh air filter improves combustion efficiency, while a new fuel filter ensures clean gasoline supply to the carburetor.
Annual Service Kit for John Deere S140 Lawn Tractor
| Item | Part Number | Description |
|---|---|---|
| Engine Oil 10W-30 | TY22029 / TY22041 | Genuine John Deere oil |
| Oil Filter | AM125424 | Standard oil filter |
| Air Filter | GY21435 | Main filter element |
| Pre-Cleaner | GY21437 | Foam insert |
| Fuel Filter | AM116304 | Inline fuel filter |
| Spark Plug | AM125424 | Ignition component |
| Mower Deck Belt | GX21833 | 48-inch deck drive belt |
| Transmission Drive Belt | UC30568 | Hydrostatic drive belt |
| Mulching Kit | GY20417 | Converts mower for mulching mode |
Genuine John Deere S140 Replacement Parts
When it comes to John Deere S140 repair and replacement, using genuine OEM parts ensures long-term reliability and safety. Below are some of the most common part numbers used for maintenance and restoration.
| Part Name | Part Number | Description |
|---|---|---|
| Oil Filter | AM125424 | Engine oil filter |
| Deck Drive Belt | GX21833 | Efficient mower deck belt |
| Front Lift Link | GX20497 | Front lift arm assembly |
| Tension Spring | GX21977 | Deck tension spring |
| Idler Pulley | AUC17621 | Flat idler pulley |
| Carburetor | MIA13043 | Complete carburetor assembly |
| Hood Top Panel | UC20916 | Replacement upper hood panel |
| Left Headlight Lens | UC20906 | Light diffuser lens |
| Steering Spindle (LH) | AUC10011 | Left-hand steering spindle |
| Connecting Rod | AUC21283 | Engine connecting rod |
| Transmission Drive Belt | UC30568 | Drive belt for hydrostatic transmission |
| Mulching Kit | GY20417 | 48-inch mower deck mulching kit |
| Right Side Decal | UC20907 | Genuine John Deere stripe decal |
Seasonal Storage and Care Tips
Keeping your John Deere S140 Lawn Tractor in top shape doesn’t take much effort if you follow a simple routine:
- Change oil in the fall after the last mowing.
- Clean the mower deck to prevent rust and buildup.
- Store the tractor indoors in a dry, covered area.
- Keep the battery charged over winter using a maintenance charger.
- Inspect belts, filters, and blades each spring before use.
These simple steps extend the life of your mower and keep it ready for reliable performance year after year.
Why Proper Maintenance Matters
Regular maintenance is the key to keeping your John Deere S140 Lawn Tractor running smoothly. Clean oil, fresh filters, and high-quality replacement parts ensure the engine performs efficiently, the transmission operates smoothly, and the mower deck cuts evenly.
Investing a little time in maintenance saves you money in the long run and preserves the performance that John Deere is known for.
