INFORMATION
WG972-E4, WSM
I-7
3. EMISSION REGULATION
[1] GENERAL
Along with E4 models, are yet available to be used in the following countries per output category.
Current and future emission regulations.
HC+NO
x
/CO (g/kW·h)
• *: with evaporative emission regulation
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[2] IMPORTANT ITEMS OF EXHAUST EMISSION REGULATION
(1) Important Notice
There are necessary emission-related items for compliance with emission regulations.
For mass-production Kubota prepares the installation instructions.
These instructions are provided for the final engine assemblers who must ensure the engine, exhaust system
(catalyst), intake system, gasoline fuel system and etc, are installed correctly in the engine's certified configuration.
(for EPA only)
Failing to these instructions when installing a certified engine in a piece of non-load equipment violates federal
law (40CFR 1068. 105(b)), subject to fines or other penalties as described in) the Clean Air Act.
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(2) Emission-Related Installation Instructions
1) Air Intake System
You must use the original air cleaner and inlet pipe to observe the applicable emissions laws.
2) Exhaust System
Kubota offers certified catalytic converter, catalytic muffler and O
2
sensor.
Catalyst parts and O
2
sensor other than Kubota must not be used because other catalyst and O
2
sensor are not
certified our engine.
3) Gasoline Fuel System
If your equipment uses a volatile liquid fuel (such as gasoline), it must use the original fuel system components
to observe the applicable emissions laws.
4) Gaseous Fuel System
You must use only the regulator with vaporizer Kubota offers and assemble the LPG fuel and CNG fuel system
parts according to the instructions.
5) Electrical System
You should wire correctly for securing the performance and safety.
6) Engine Labels
EPA/CARB label must be visible at any time. Be careful not to damage the label.
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kW, Disp. Model Type
North
America
Europe Japan
19 < P ≤ 30,
0.825 < L ≤ 1.0
WG972-E4 E4 Available Available
None
Available
Countries Power [kW], Disp. [L] 2014 2015 2016 2017 2018 2019 2020 2021
USA
CARB
P ≤ 19, 0.225 ≤ L 8.0/549*
19 < P, L ≤ 0.825 8.0/549*
19 < P, 0.825 < L ≤ 1.0 6.5/375* 0.8/20.6*
EPA
P ≤ 19, 0.225 ≤ L 8.0/610*
19 < P ≤ 30, L ≤ 1.0 8.0/610*
Canada
P ≤ 19, 0.225 ≤ L 8.0/610
19 < P None
EU
P ≤ 19, 0.225 ≤ L
Gas Engine is not
covered
12.1/610 8/610
19 < P < 56 None Σ2.7 to Σ0.8 / 4.4 to 20.6
Japan P < 19, 0.225 ≤ L 12.1/610 8/610
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