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.
- Walker Walker Model D21d — commercial: daily paid use and high acreage; 52-inch deck
- Bobcat ZT5000 Zero-Turn Mower — commercial: daily paid use and high acreage; 52-inch deck; gas powered
What’s different? The 3 differences that matter most, from the published figures.
- Walker Model D21d holds 4.7 gal (17.8 L) of fuel; ZT5000 Zero-Turn Mower holds 7.8 gal (29.5 L) of fuel, a 3.1 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.
- Walker Model D21d has a 20.9 hp engine; ZT5000 Zero-Turn Mower has a 23.5 hp engine, a 2.6 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.
- Walker Model D21d cuts from 1 in (25 mm) to 4 in (102 mm); ZT5000 Zero-Turn Mower cuts from 1.5 in (38 mm) to 4.8 in (121 mm). The cut-height range is the shortest and tallest cut the deck offers. Most lawns are kept well inside it.
what isn’t comparable
Not comparable
- Ground Speed: not published for ZT5000 Zero-Turn Mower.
- Engine Make: not published for ZT5000 Zero-Turn Mower.
- Fuel Type: not published for ZT5000 Zero-Turn Mower.
- Deck Construction: not published for Walker Model D21d.
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 | Walker Model D21d Walker · Commercial |
ZT5000 Zero-Turn Mower Bobcat · Commercial |
|---|---|---|
| List price | dealer quote | dealer quote |
| Engine | ||
| Power Source | diesel | gas |
| Engine Make | Kubota | — |
| Displacement | 43.9 ci (719 cc) | 44 ci (721 cc) |
| Engine Power | 20.9 hp | 23.5 hp |
| Fuel Type | Diesel (2-D) | — |
| Engine Model | — | Kawasaki FX730V Gas Engine |
| Deck | ||
| Cutting Width | 52 in (1321 mm) | 52 in (1321 mm) |
| Deck Construction | — | AirFX Dual 10-gauge layer top with 3-gauge and 7-gauge brackets throughout |
| Min Cut Height | 1 in (25 mm) | 1.5 in (38 mm) |
| Max Cut Height | 4 in (102 mm) | 4.8 in (121 mm) |
| Blade Tip Speed | — | 18143 ft/min (5530 m/min) |
| Drive | ||
| Transmission | Dual Hydrostatic Eaton Model 7 transmission with ductile cast iron final drive, Each Wheel Independently Driven | Hydro Gear ZT-3800 Hydrostatic |
| Ground Speed | 6.5 mph | — |
| Drive Tire Size | — | 24 x 10.5-12 |
| Dimensions | ||
| Weight | 1001 lbs (454 kg) | 995 lbs (451.3 kg) |
| Fuel Capacity | 4.7 gal (17.8 L) | 7.8 gal (29.5 L) |
| Length | — | 79.8 in (2027 mm) |
Where these models differ, explained
Walker Model D21d: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — walker.com.
ZT5000 Zero-Turn Mower: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — bobcat.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.