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 ZD1021-60 — commercial: daily paid use and high acreage; 60-inch deck
- John Deere Z920MZTrak Zero-Turn Mower — commercial: daily paid use and high acreage; 60-inch deck; gas powered
What’s different? The 5 differences that matter most, from the published figures.
- ZD1021-60 holds 6.1 gal (23.1 L) of fuel; Z920MZTrak Zero-Turn Mower holds 11.5 gal (43.5 L) of fuel, a 5.4 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.
- ZD1021-60 has a 2-HST w/Gear reduction transmission; Z920MZTrak Zero-Turn Mower has a Hydrostatic transmission. The transmission grade tracks duty rating and speed. Grade names are each maker's own and are not comparable across brands.
- ZD1021-60 runs on Diesel; Z920MZTrak Zero-Turn Mower runs on Gasoline. Fuel type sets what you buy and store; it is not a measure of power.
- ZD1021-60 has a published top speed of 9 mph; Z920MZTrak Zero-Turn Mower has a published top speed of 12 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.
- ZD1021-60 has a 54.8 ci (898 cc) engine; Z920MZTrak Zero-Turn Mower has a 44.3 ci (726 cc) engine, a 10.5 ci difference. Displacement is the engine's size, not its output. A larger engine is not necessarily a more powerful one.
2 more differences, calculated figures and what isn’t comparable
Other verified differences
- ZD1021-60 has a 21.6 hp engine; Z920MZTrak Zero-Turn Mower has a 23.5 hp engine, a 1.9 hp difference.
- ZD1021-60 weighs 1,389 lbs (630 kg); Z920MZTrak Zero-Turn Mower weighs 1,313 lbs (595.6 kg), a 76 lbs difference.
Calculated by MowerFacts
- ZD1021-60 works out to 4.4 acres/hour; Z920MZTrak Zero-Turn Mower works out to 5.8 acres/hour, a 1.5 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
- Engine Make: not published for Z920MZTrak Zero-Turn Mower.
- Deck Construction: not published for ZD1021-60.
- Drive System: not published for Z920MZTrak Zero-Turn Mower.
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 | ZD1021-60 Kubota · Commercial |
Z920MZTrak Zero-Turn Mower John Deere · Commercial |
|---|---|---|
| List price | dealer quote | dealer quote |
| Engine | ||
| Power Source | diesel | gas |
| Engine Make | Diesel, liquid-cooled (3 cyl.) | — |
| Displacement | 54.8 ci (898 cc) | 44.3 ci (726 cc) |
| Engine Power | 21.6 hp | 23.5 hp |
| Cylinders | — | 2 |
| Fuel Type | Diesel | Gasoline |
| Engine Model | — | FX730V |
| Deck | ||
| Cutting Width | 60 in (1524 mm) | 60 in (1524 mm) |
| Deck Construction | — | 7-gauge, 0.179-in. (4.6-mm) one-piece forged steel |
| Drive | ||
| Transmission | 2-HST w/Gear reduction | Hydrostatic |
| Ground Speed | 9 mph | 12 mph |
| Drive System | Shaft | — |
| Dimensions | ||
| Weight | 1389 lbs (630 kg) | 1313 lbs (595.6 kg) |
| Fuel Capacity | 6.1 gal (23.1 L) | 11.5 gal (43.5 L) |
Where these models differ, explained
ZD1021-60: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — kubotausa.com.
Z920MZTrak Zero-Turn Mower: 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.