Compare Mowers
List prices are the manufacturer’s published figures, re-checked daily; they exclude tax, freight and dealer setup.
A side-by-side reference of each model's stated specifications. MowerFacts doesn’t give opinions: where a published, spec-derived rule can separate machines we mark a Data Pick and show the rule; here, read the values and decide what fits your needs.
Best suited for
What each model is built for, from its duty class and key specs. This is a neutral reference — MowerFacts does not rank one model above another.
- John Deere X739 Signature Series Lawn Tractor — prosumer: larger home properties and light acreage; 48-inch deck; gas powered
- John Deere S120 Lawn Tractor — prosumer: larger home properties and light acreage; 42-inch deck; gas powered
What’s different? The 5 differences that matter most, from the published figures.
- X739 Signature Series Lawn Tractor weighs 1,034 lbs (469 kg); S120 Lawn Tractor weighs 444 lbs (201.4 kg), a 590 lbs difference. Operating weight bears on trailer payload, ramps and soft turf. On its own it says nothing about build quality. What X739 Signature Series Lawn Tractor's weight means for a trailer ›
- X739 Signature Series Lawn Tractor holds 5.2 gal (19.7 L) of fuel; S120 Lawn Tractor holds 2.4 gal (9.1 L) of fuel, a 2.8 gal difference. Tank size bounds how long a machine runs between stops. Consumption varies with engine, load and speed, so hours per tank are not fixed.
- X739 Signature Series Lawn Tractor has a K90 hydrostatic integrated with transaxle transmission; S120 Lawn Tractor has a Hydrostatic, 2-wheel drive transmission. The transmission grade tracks duty rating and speed. Grade names are each maker's own and are not comparable across brands.
- X739 Signature Series Lawn Tractor has a published top speed of 8.5 mph; S120 Lawn Tractor has a published top speed of 5.5 mph, a 3 mph difference. Top speed is the maker's maximum in transport. Mowing speed is lower and depends on grass, terrain and the deck.
- X739 Signature Series Lawn Tractor carries a 4-year warranty; S120 Lawn Tractor carries a 2-year warranty, a 2 years difference. Warranty length is the maker's published term. Conditions and commercial-use limits differ between makers.
6 more differences, calculated figures and what isn’t comparable
Other verified differences
- X739 Signature Series Lawn Tractor has a 19 bu (670 L) bagger; S120 Lawn Tractor has a 6.5 bu (229 L) bagger, a 12.5 bu difference.
- X739 Signature Series Lawn Tractor has Shaft or AutoConnect drive; S120 Lawn Tractor has Manual power take-off (PTO) drive.
- X739 Signature Series Lawn Tractor cuts from 1 in (25 mm) to 5.2 in (133 mm); S120 Lawn Tractor cuts from 1 in (25 mm) to 4 in (102 mm).
- X739 Signature Series Lawn Tractor has a 48 in (1,219 mm) deck; S120 Lawn Tractor has a 42 in (1,067 mm) deck, a 6 in difference.
- X739 Signature Series Lawn Tractor has a 25.5 hp engine; S120 Lawn Tractor has a 22 hp engine, a 3.5 hp difference.
- X739 Signature Series Lawn Tractor has a 45.5 ci (745 cc) engine; S120 Lawn Tractor has a 44.2 ci (724.3 cc) engine, a 1.3 ci difference.
Calculated by MowerFacts
- X739 Signature Series Lawn Tractor works out to 3.3 acres/hour; S120 Lawn Tractor works out to 1.9 acres/hour, a 1.4 acres/hour difference. Calculated by MowerFacts from deck width and the published top speed at 80% efficiency; it is not a manufacturer figure, and real mowing is slower.
Not comparable
- Fuel Type: not published for X739 Signature Series Lawn Tractor.
- Deck Construction: not published for X739 Signature Series Lawn Tractor.
- Discharge: not published for X739 Signature Series Lawn Tractor.
Verified means each manufacturer publishes the figure. A bigger number is only a bigger number; nothing here says which machine is better. The full specification table is below.
Which is faster on your property? › Measure your lawn once and MowerFacts times all 2 against it.
| Spec | X739 Signature Series Lawn Tractor John Deere · Riding (Lawn Tractor) |
S120 Lawn Tractor John Deere · Riding (Lawn Tractor) |
|---|---|---|
| List price | dealer quote | dealer quote |
| Engine | ||
| Power Source | gas | gas |
| Displacement | 45.5 ci (745 cc) | 44.2 ci (724.3 cc) |
| Engine Power | 25.5 hp | 22 hp |
| Cylinders | 2 | 2 |
| Engine Model | FD750D EFI | 44N677 (M44) |
| Fuel Type | — | Gasoline |
| Deck | ||
| Cutting Width | 48 in (1219 mm) | 42 in (1067 mm) |
| Min Cut Height | 1 in (25 mm) | 1 in (25 mm) |
| Max Cut Height | 5.2 in (133 mm) | 4 in (102 mm) |
| Deck Material | 48A, 10 gauge 0.135 in. 3.4 mm 54 HC and 60 HC, 9 gauge 0.150 in. 3.8 mm | Steel, 13 gauge0.090 in.2.3 mm |
| Deck Construction | — | Stamped steel deck shell |
| Deck Gauge | 10 | 13 |
| Discharge | — | Side discharge |
| Drive | ||
| Transmission | K90 hydrostatic integrated with transaxle | Hydrostatic, 2-wheel drive |
| Ground Speed | 8.5 mph | 5.5 mph |
| Drive Tire Size | — | 20x8-8 |
| Reverse Speed | 6 mph | 3.2 mph |
| Drive System | Shaft or AutoConnect | Manual power take-off (PTO) |
| Dimensions | ||
| Weight | 1034 lbs (469 kg) | 444 lbs (201.4 kg) |
| Fuel Capacity | 5.2 gal (19.7 L) | 2.4 gal (9.1 L) |
| Length | — | 69.7 in (1770 mm) |
| Width | — | 55.2 in (1402 mm) |
| Height | — | 44 in (1118 mm) |
| Commercial / Pro | ||
| Frame Construction | — | Full-length welded steel |
| Seat Type | — | Two-piece with open-back |
| General | ||
| Warranty | 4 yr | 2 yr |
| Bagger Capacity | 19 bu (670 L) | 6.5 bu (229 L) |
Where these models differ, explained
X739 Signature Series Lawn Tractor: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — deere.com.
S120 Lawn Tractor: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — deere.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.