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 Z421KWTNC-60 — commercial: daily paid use and high acreage; 60-inch deck; gas powered
- Gravely ZT HD 60 KAWASAKI — 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.
- Z421KWTNC-60 has Belt drive; ZT HD 60 KAWASAKI has Hydro-Gear® ZT-3100® Transaxles drive.
- Z421KWTNC-60 holds 6.8 gal (25.7 L) of fuel; ZT HD 60 KAWASAKI holds 5.1 gal (19.3 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.
- Z421KWTNC-60 has a published top speed of 10 mph; ZT HD 60 KAWASAKI has a published top speed of 8 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.
- Z421KWTNC-60 weighs 904 lbs (410.1 kg); ZT HD 60 KAWASAKI weighs 843 lbs (382.4 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 Z421KWTNC-60's weight means for a trailer ›
calculated figures and what isn’t comparable
Calculated by MowerFacts
- Z421KWTNC-60 works out to 4.8 acres/hour; ZT HD 60 KAWASAKI works out to 3.9 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 | Z421KWTNC-60 Kubota · Zero-Turn |
ZT HD 60 KAWASAKI Gravely · Zero-Turn |
|---|---|---|
| List price | dealer quote | $6,999 |
| 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 FS730V | Kawasaki® |
| Engine Model | — | FR730V |
| Fuel Type | Gasoline | Gas |
| 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 | 10 mph | 8 mph |
| Drive Tire Size | 24 x 12 -14, LP | — |
| Reverse Speed | — | 4 mph |
| Drive System | Belt | Hydro-Gear® ZT-3100® Transaxles |
| Dimensions | ||
| Weight | 904 lbs (410.1 kg) | 843 lbs (382.4 kg) |
| Fuel Capacity | 6.8 gal (25.7 L) | 5.1 gal (19.3 L) |
Where these models differ, explained
Z421KWTNC-60: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — kubotausa.com.
ZT HD 60 KAWASAKI: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — gravely.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.