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Kubota Z231KH vs Kubota ZD21
Verdict: Kubota Z231KH vs Kubota ZD21
The Kubota Z231KH and the Kubota ZD21 are both lawn tractors — here is how they stack up on the figures that matter. Both are rated at the same 21 hp. Kubota Z231KH is the lighter machine (339 kg vs 631 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Kubota ZD21 holds more fuel (29.9 L vs 16.3 L) for longer stints between fills. Kubota Z231KH is the newer design (2019 vs 2001). Use the full side-by-side spec tables below to weigh the details against your own operation, and confirm with a dealer demo.
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Fit & specs
Kubota
71
Fit score
Best match
Clear
Kubota
71
Fit score
Best match
Clear
Rated power
21 hp
21 hp
Confidence
98%
98%
Guide price
—
—
Overview
Manufacturer
KubotaReference
KubotaReference
air-cooled vertical-shaft V-TwinReference
liquid-cooledReference
Steering
—
differential powerReference
Engine
Fuel tank
16.3 LReference
29.9 LReference
Displacement
45.6 ciReference
47.5 ciReference
Bore/Stroke
83 x 67 mmReference
67 x 74 mmReference
Power
15.7 kWReference
—
Starter
electricReference
electricReference
Starter volts
12Reference
12Reference
Oil capacity
2.3 LReference
—
Power (gross)
—
15.7 kWReference
Rated RPM
—
3200Reference
Transmission
Transmission
Hydro-Gear ZT3100Reference
—
Gears
infinite forward and reverseReference
infinite forward and reverseReference
PTO & Hydraulics
Mid PTO
independentReference
independentReference
Clutch
electricReference
—
Dimensions
Wheelbase
115 cmReference
124 cmReference
Weight
339 kgReference
631 kgReference
Front tire
11x4-5Reference
15x6.0-6Reference
Rear tire
22x10-14Reference
24x12-12Reference
Lawn/turf front
11x4-5Reference
15x6.0-6Reference
Lawn/turf rear
22x10-14Reference
24x12-12Reference
Length
194 cmReference
203 cmReference
Width
120 cmReference
145 cmReference
Height (ROPS)
165 cmReference
191 cmReference
Front tread
79 cmReference
97 cmReference
Rear tread
95 cmReference
107 cmReference
Height (steering wheel)
—
115 cmReference
Kubota Z231KH attachments
Electrical
Ground
negativeReference
negativeReference
Charging amps
15Reference
—
Battery CCA
300Reference
450Reference
Battery volts
12Reference
12Reference
48" Mower deck
Type
belt-driven hydrostaticReference
hydrostaticReference
Cutting width
121 cmReference
152 cmReference
Overall width
155 cmReference
187 cmReference
Cut height
3 to 10 cmReference
2 to 12 cmReference
Kubota ZD21 attachments
60" Mower deck
Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.