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.
- Kubota GR2120 — commercial: daily paid use and high acreage; 48-inch deck
- John Deere X738 Signature Series Lawn Tractor — prosumer: larger home properties and light acreage; 48-inch deck; gas powered
What’s different? The 5 differences that matter most, from the published figures.
- GR2120 has a Kubota HST transmission; X738 Signature Series Lawn Tractor has a K90 hydrostatic integrated with transaxle transmission. The transmission grade tracks duty rating and speed. Grade names are each maker's own and are not comparable across brands.
- GR2120 has a published top speed of 6.2 mph; X738 Signature Series Lawn Tractor has a published top speed of 8.5 mph, a 2.3 mph difference. Top speed is the maker's maximum in transport. Mowing speed is lower and depends on grass, terrain and the deck.
- GR2120 has Belt drive; X738 Signature Series Lawn Tractor has Shaft or AutoConnect drive.
- GR2120 has a 21 hp engine; X738 Signature Series Lawn Tractor has a 25.5 hp engine, a 4.5 hp difference. Published horsepower is the maker's rating at a stated engine speed. It is a different measure from displacement, and two engines of equal rating can pull differently.
- GR2120 holds 4.8 gal (18 L) of fuel; X738 Signature Series Lawn Tractor holds 5.2 gal (19.7 L) of fuel, a 0.4 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.
2 more differences, calculated figures and what isn’t comparable
Other verified differences
- GR2120 has a 47.5 ci (778 cc) engine; X738 Signature Series Lawn Tractor has a 45.5 ci (745 cc) engine, a 2 ci difference.
- GR2120 weighs 968 lbs (439 kg); X738 Signature Series Lawn Tractor weighs 948 lbs (430 kg), a 20 lbs difference.
Calculated by MowerFacts
- GR2120 works out to 2.4 acres/hour; X738 Signature Series Lawn Tractor works out to 3.3 acres/hour, a 0.9 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
- Warranty: not published for GR2120.
- Bagger Capacity: not published for GR2120.
- Engine Make: not published for X738 Signature Series Lawn Tractor.
- Fuel Type: not published for X738 Signature Series Lawn Tractor.
- Deck Material: not published for GR2120.
- Cut height range: not published for GR2120.
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 | GR2120 Kubota · Riding (Lawn Tractor) |
X738 Signature Series Lawn Tractor John Deere · Riding (Lawn Tractor) |
|---|---|---|
| List price | dealer quote | dealer quote |
| Engine | ||
| Power Source | diesel | gas |
| Displacement | 47.5 ci (778 cc) | 45.5 ci (745 cc) |
| Engine Power | 21 hp | 25.5 hp |
| Engine Make | Kubota D782 | — |
| Cylinders | — | 2 |
| Engine Model | — | FD750D EFI |
| Fuel Type | Diesel | — |
| Deck | ||
| Cutting Width | 48 in (1219 mm) | 48 in (1219 mm) |
| Min Cut Height | — | 1 in (25 mm) |
| Max Cut Height | — | 5.2 in (133 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 |
| Deck Gauge | — | 10 |
| Drive | ||
| Transmission | Kubota HST | K90 hydrostatic integrated with transaxle |
| Ground Speed | 6.2 mph | 8.5 mph |
| Reverse Speed | — | 6 mph |
| Drive System | Belt | Shaft or AutoConnect |
| Dimensions | ||
| Weight | 968 lbs (439 kg) | 948 lbs (430 kg) |
| Fuel Capacity | 4.8 gal (18 L) | 5.2 gal (19.7 L) |
| General | ||
| Warranty | — | 4 yr |
| Bagger Capacity | — | 19 bu (670 L) |
Where these models differ, explained
GR2120: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — kubotausa.com.
X738 Signature Series 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.