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Engine model
Emission regulation
EPA/CARB Tier 4 (NRTC/NTE test mode) + EU Stage V
Vertical, water cooled 4-cycle diesel engine
Bore and stroke
mm (in)
72.0 x 73.6 (2.83 x 2.90)
L (
0.898 (54.80)
Naturally aspirated
Rated output / speed*1
kW (HP) / rpm
18.5 (24.8) / 3600
Maximum torque / speed*1
Nm (lb-ft) / rpm
56.1 (41.4) / 2600
Combustion system
Indirect injection
Fuel system
In-line pump
Length x Width x Height*2
(without aftertreatment unit)
mm (in)
434 x 401 x 544 (17.1 x 15.8 x 21.4)
Length x Width x Height*3
(with aftertreatment unit)
mm (in)
Dry weight
kg (lb)
72 (159)
  • Specifications are subject to change without notice.
    Dimensions and dry weight are according to Kubota's standard specification.
    Dimensions and weight depend on completed specifications.
  • 1: SAE J1995 gross intermittent
    *2: Exclude cooling fan and exclude aftertreatment unit
    *3: Exclude cooling fan and include aftertreatment unit on engine

18.5 kW @ 3600 rpm

Photographs may show non-standard equipment.


Dimensions and weight depend on composed specifications.




The Kubota Super Mini Series features compact multi-cylinder
liquid cooled industrial diesel engines which comply with EPA /
CARB Tier 4 emissions regulations.

Durable Power

The D902 engine delivers the highest output among the Kubota
Super Mini Series engines.
By expanding the bore and stroke, Kubota has increased engine
displacement while maintaining the same footprint as the D722
engine. The use of an extended shallow oil pan keeps the engine
height lower than that of the D722, providing a compact engine
The cooling water passages between the cylinder bores features
Kubota’s original casting technology as a countermeasure against
the heat load caused by high power density, providing both superior
endurance and reliable engine performance.
This engine offers a seamless transition from E3 to E4 by maintaining
the same level of performance and physical characteristics.
Alternative fuel engines WG972-G (gasoline) and WG972-GL
(dual fuel: gasoline / LPG) are available with the same footprint
as the D902 engine.

Clean and Quiet Power

Kubota’s original E-TVCS (Three Vortex Combustion System) has
been further improved for cleaner emissions. The piston recess
has been optimized to achieve lower particulate matter (PM)
levels at an extremely small size. The half-float valve cover and
MoS2-coated pistons reduce noise levels and decrease vibrations
transmitted from the valve area.

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