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.
- Gravely ZT HD 60 KAWASAKI — commercial: daily paid use and high acreage; 60-inch deck; gas powered
- Kubota Z421KWTNC-60 — commercial: daily paid use and high acreage; 60-inch deck; gas powered
What’s different? The 4 differences that matter most, from the published figures.
- ZT HD 60 KAWASAKI has Hydro-Gear® ZT-3100® Transaxles drive; Z421KWTNC-60 has Belt drive.
- ZT HD 60 KAWASAKI holds 5.1 gal (19.3 L) of fuel; Z421KWTNC-60 holds 6.8 gal (25.7 L) of fuel, a 1.7 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.
- ZT HD 60 KAWASAKI has a published top speed of 8 mph; Z421KWTNC-60 has a published top speed of 10 mph, a 2 mph difference. Top speed is the maker's maximum in transport. Mowing speed is lower and depends on grass, terrain and the deck.
- ZT HD 60 KAWASAKI weighs 843 lbs (382.4 kg); Z421KWTNC-60 weighs 904 lbs (410.1 kg), a 61 lbs difference. Operating weight bears on trailer payload, ramps and soft turf. On its own it says nothing about build quality. What ZT HD 60 KAWASAKI's weight means for a trailer ›
calculated figures and what isn’t comparable
Calculated by MowerFacts
- ZT HD 60 KAWASAKI works out to 3.9 acres/hour; Z421KWTNC-60 works out to 4.8 acres/hour, a 1.0 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
- Transmission: not published for ZT HD 60 KAWASAKI.
- Deck Material: not published for Z421KWTNC-60.
- Deck Construction: not published for Z421KWTNC-60.
- Discharge: not published for Z421KWTNC-60.
- Cut height range: not published for Z421KWTNC-60.
- Price: Z421KWTNC-60 is dealer quote only.
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 | ZT HD 60 KAWASAKI Gravely · Zero-Turn |
Z421KWTNC-60 Kubota · Zero-Turn |
|---|---|---|
| List price | $6,999 | dealer quote |
| Engine | ||
| Power Source | gas | gas |
| Displacement | 44.3 ci (726 cc) | 44.3 ci (726 cc) |
| Engine Power | 24 hp | 24 hp |
| Engine Make | Kawasaki® | Kawasaki FS730V |
| Engine Model | FR730V | — |
| Fuel Type | Gas | Gasoline |
| Deck | ||
| Cutting Width | 60 in (1524 mm) | 60 in (1524 mm) |
| Min Cut Height | 1.5 in (38 mm) | — |
| Max Cut Height | 5 in (127 mm) | — |
| Deck Material | 7 ga | — |
| Deck Construction | Fabricated X-Factor® 3 | — |
| Deck Gauge | 7 | — |
| Discharge | Side | — |
| Drive | ||
| Transmission | — | Hydro-Gear Commercial ZT-3600 |
| Ground Speed | 8 mph | 10 mph |
| Drive Tire Size | — | 24 x 12 -14, LP |
| Reverse Speed | 4 mph | — |
| Drive System | Hydro-Gear® ZT-3100® Transaxles | Belt |
| Dimensions | ||
| Weight | 843 lbs (382.4 kg) | 904 lbs (410.1 kg) |
| Fuel Capacity | 5.1 gal (19.3 L) | 6.8 gal (25.7 L) |
Where these models differ, explained
ZT HD 60 KAWASAKI: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — gravely.com.
Z421KWTNC-60: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — kubotausa.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.