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WG972 E3
Kubota WG972 E3 User Manual
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KUBO
T
A ENGINES
APPLICA
TION MANU
AL
(WG752,
WG972 E3 MODEL)
(DG972 E2 MODEL)
First Edition
J
anuary
, 2011
KUBO
T
A
2
Table of Contents
Kubota Engines Application Manual
2
Table of Contents
2
Specifications
3
General Information
4
Emission Regulation
8
Performance Curves
9
Dimensions
11
Fuel System
21
Emission-Related Installation Instructions
22
Exhaust System
24
Engine Labels
25
2. Fuel System
28
1 General
29
Gasoline
29
Lpg
29
Natural Gas
29
2 Fuel Diagram
30
3 Cautions
32
For Safety (WG752−GL, WG972−GL, DG972)
32
Tightening Torque and Leak Check for Vaporizer and Gas Regulator
32
Change the Angle of LPG Fitting of Dual Fuel Carburetor and Gas Fitting of Gas Mixer
32
Setting and Vibration Limits
32
Starting the Engine (WG752−GL, WG972−GL)
32
For Emission Regulations (WG752−GL, WG972−GL, DG972)
33
Vaporizer and Gas Regulator
33
Length of the Gas Hose
33
4 High Altitude Operation (Wg752, Wg972)
34
5 EVAPORATIVE EMISSION CONTROL (Gasoline Fuel)
35
Regulations
35
Related Check Items
35
3. Exhaust System
36
General (Wg752, Wg972)
37
Exceptions (Wg752, Wg972)
38
Related Check Items
39
For Mass Production (Wg752, Wg972)
40
Electrical System
41
Technical Information
45
3 Technical Information
46
1 Brake Horse Power
47
2 Fuel Consumption
48
3 Sound Pressure Level
49
4 Air Requirements
50
Combustion Air Requirements (at 25 Deg.C and 1000 Hpa)
50
Cooling Air Requirements (at 25 Deg.C and 1000 Hpa)
51
Combustion and Cooling Air Requirements (at 25 Deg.C and 1000 Hpa)
52
5 Exhaust Gas Volume
53
6 Heat Rejection to Coolant
54
7 Water Flow Rate
56
Water Flow Rate of Wg752
56
Water Flow Rate of Wg972, Dg972
57
8 Center of Gravity
58
9 Mass Elastic System
59
Equivalent Torsional Vibration Data
59
10 Unbalanced Forces
60
Base Data
60
Unbalanced Inertia Force and Couple
60
An Example of Calculation
61
Application Check Sheet
62
Exhaust Emission Check Sheet
64
Emissions-Related Installation
73
Kubota Emissions-Related Installation Instructions Carb/Epa Certified Engines, Wg752 & Wg972
74
1 Important Notice
75
2 About Objective Items
75
Air Intake System
76
Exhaust System
78
High Altitude Operation
82
Evaporative Emission Controls
83
Engine Set Speed
84
Certification Labels
85
Vaporizer Connections
86
3 Production Installation Checklist
86
Important Notice
89
About Objective Items
89
Air Intake System
89
Engine Set Speed
91
Certification Labels
92
Regulator Connections
93
Production Installation Checklist
93
4
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Kubota WG972 E3 Specifications
General
Engine Model
WG972 E3
Number of Cylinders
3
Displacement
962 cc
Fuel
Gasoline
Cooling System
Liquid-cooled
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