Kubota DG972 E2, WG752 E3, WG972 E3 Installation Instruction
Kubota DG972 E2 is a vertical, water cooled 4-cycle Natural Gas engine with a total displacement of 0.962 L (58.7 cu. in). It has a high idle speed of 3850 min-1 (rpm) and a low idle speed of 1500 min-1 (rpm). The DG972 E2 produces a maximum torque of 68.6 N·m (50.6 ft-lb) at 2400 min-1 (rpm). It is equipped with a centrifugal ball mechanical type governor and has a dry weight of approximately 72.0 kg (159 lb).
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KUBOTA ENGINES
APPLICATION MANUAL
(WG752, WG972 E3 MODEL)
(DG972 E2 MODEL)
First Edition
January, 2011
KUBOTA
CONTENTS
1. PREFACE
2. GENERAL INFORMATION
0. GENERAL
1. EMISSION REGULATION
2. FUEL SYSTEM
3. EXHAUST SYSTEM
4. ELECTRICAL SYSTEM
3. TECHNICAL INFORMATION
4. APPLICATION CHECK SHEET
5. EXHAUST EMISSION CHECK SHEET
6. EMISSIONS-RELATED INSTALLATION
INSTRUCTION
1. PREFACE
1. This has been prepared so as to enable users to properly and efficiently utilize KUBOTA small SI engines.
2. This manual describes the features of the engines, the cautions and the check items for mounting the engines on various machines.
3. The contents of this manual are roughly divided into the following two items.
a) General information b) Technical information
4. This manual describes only the content that should be mentioned specially for small SI engines.
Please also refer to the diesel engine application manual.
5. Phase3 emissions regulations require confirmation of “Emissions-Related Installation Instructions”,
“Contractual agreement” etc. between engine and equipment manufactures under 40CFR1068.
6. The specifications and features described in this manual are subject to change without advance notice for technical improvement.
7. If you have any question about this manual, please contact with nearest KUBOTA sales representatives or send e-mail to “[email protected]”.
2
GENERAL INFORMATION
0. GENERAL
CONTENTS
1. SPECIFICATIONS......................................................................................................................... 0-1
2. PERFORMANCE CURVES........................................................................................................... 0-4
3. DIMENSIONS ................................................................................................................................ 0-6
1. SPECIFICATIONS
Item
Model
WG752-G-E3 WG752-GL-E3
Type
Number of cylinders
Cylinder bore x Stroke
Total displacement
High idle
Low idle
Brake horse power
SAE J1995 Gross intermittent
SAE J1349 Net intermittent
SAE J1349 Net continuous
ISO Gross
ISO Continuous
JIS B8002 Net
Intermittent
JIS B8002 Continuous mm (in)
L (cu. in) min -1 min -1 min -1
(rpm)
(rpm) kW (HP) /
(rpm)
Vertical, water cooled
4-cycle Gasoline engine
Vertical, water cooled 4-cycle Dual Fuel
(Gasoline/LPG)
Gasoline fuel
3
LPG fuel
68.0 (2.68) x 68.0 (2.68)
0.740 (45.2)
18.5 (24.8) / 3600
17.1 (23.0) / 3600
13.4 (18.0) / 3600
18.5 (24.8) / 3600
13.4 (18.0) / 3600
17.1 (23.0) / 3600
13.4 (18.0) / 3600
3850
1500
17.7 (23.8) / 3600
16.4 (22.0) / 3600
12.7 (17.0) / 3600
17.7 (23.8) / 3600
12.7 (17.0) / 3600
16.4 (22.0) / 3600
12.7 (17.0) / 3600
Max. torque (SAE J1349)
N·m (ft-lb) min -1 (rpm)
54.9 (40.5) / 2400 52.0 (38.3) / 2400
Compression ratio
Firing order
Ignition timing
Fuel
Direction of rotation
Starting system
Starter output
Alternator output
Lubricating system
Lubricating oil
Lubricating oil capacity
Catalytic Muffler / Converter
Coolant capacity (with radiator)
Governor type
Dimensions (L x B x H)
Dry weight
V-kW
V-W
L (U.S. gal)
L (U.S. gal) mm (in) kg (lb)
NOTE
• * LPG regulator with vaporizer operates on a liquid withdrawal type system.
9.2
1 − 2 − 3
B.T.D.C.18 °
Unleaded gasoline
Counter-clockwise from flywheel side
Electric starting with cell starter
12 − 0.7
12 − 150 (Standard)
Forced lubricating by trochoid pump
Quality better than SH class
3.25 (0.86)
Three Way Catalyst
2.8 (0.74)
Centrifugal ball mechanical type governor
428.5 x 396.9 x 539.8 (16.87 x 15.63 x 21.25)
Approx. 61.7 (136.0)
Commercial
LPG *
0-1
Item
Model
WG972-G-E3 WG972-GL-E3
Type
Number of cylinders
Cylinder bore x Stroke
Total displacement
High idle
Low idle
Brake horse power
SAE J1995 Gross intermittent
SAE J1349 Net intermittent
SAE J1349 Net continuous
ISO Gross
ISO Continuous
JIS B8002 Net
Intermittent
JIS B8002 Continuous mm (in)
L (cu. in) min min min
-1 (rpm)
-1 (rpm) kW (HP) /
-1 (rpm)
Vertical, water cooled
4-cycle Gasoline engine
Vertical, water cooled 4-cycle Dual Fuel
(Gasoline/LPG)
Gasoline fuel
3
LPG fuel
74.5 (2.93) x 73.6 (2.90)
0.962 (58.7)
24.2 (32.5) / 3600
23.1 (31.0) / 3600
18.7 (25.0) / 3600
24.2 (32.5) / 3600
18.7 (25.0) / 3600
23.1 (31.0) / 3600
18.7 (25.0) / 3600
3850
1500
23.1 (31.0) / 3600
22.0 (29.5) / 3600
17.5 (23.5) / 3600
23.1 (31.0) / 3600
17.5 (23.5) / 3600
22.0 (29.5) / 3600
17.5 (23.5) / 3600
Max. torque (SAE J1349)
N·m (ft-lb) min -1 (rpm)
68.6 (50.6) / 2400 64.6 (47.6) / 2400
Compression ratio
Firing order
Ignition timing
Ignition system
Fuel
Direction of rotation
Starting system
Starter output
Alternator output
Lubricating system
Lubricating oil
Lubricating oil capacity
Catalytic Muffler / Converter
Coolant capacity (with radiator)
Governor type
Dimensions (L x B x H)
V-kW
V-W
L (U.S. gal)
L (U.S. gal) mm (in)
9.2
1 − 2 − 3
B.T.D.C. 8 ° / 1000 min -1 (rpm) B.T.D.C. 21 ° / 3600 min -1 (rpm) *1
Distributor-less Solid State type
Unleaded gasoline
Counter-clockwise from flywheel side
Commercial
LPG *2
Electric starting with cell starter
12 − 1.0
12-480 (Standard)
Forced lubricating by trochoid pump
Quality better than SH class
3.4 (0.90)
Three Way Catalyst
3.5 (0.92)
Centrifugal ball mechanical type governor
BBH : 452.6 x 416.4 x 502.5 (17.82 x 16.39 x 19.78)
SAEH : 525.5 x 416.4 x 502.5 (20.69 x 16.39 x 19.78)
Approx. 72.0 (159) Dry weight kg (lb)
NOTE
• *1 Consult Kubota for further information.
• *2 LPG regulator with vaporizer operates on a liquid withdrawal type system.
0-2
Model
Item
Type
Number of cylinders
Cylinder bore x Stroke
Total displacement
High idle
Low idle
Brake horse power
SAE J1995 Gross intermittent
SAE J1349 Net intermittent
SAE J1349 Net continuous
ISO Gross
ISO Continuous
JIS B8002 Net
Intermittent
JIS B8002 Continuous mm (in)
L (cu. in) min -1 (rpm) min -1 (rpm) kW (HP) / min -1 (rpm)
N·m (ft-lb) min -1 (rpm)
Max. torque (SAE J1349)
Compression ratio
Firing order
Ignition timing
Ignition system
Fuel
Direction of rotation
Starting system
Starter output
Alternator output
Lubricating system
Lubricating oil
Lubricating oil capacity
Coolant capacity (with radiator)
Governor type
Dimensions (L x B x H)
V-kW
V-W
L (U.S. gal)
L (U.S. gal) mm (in)
Dry weight kg (lb)
DG972
Vertical, water cooled 4-cycle Natural Gas engine
3
74.5 (2.93) x 73.6 (2.90)
0.962 (58.7)
3850
1500
18.7 (25.1) / 3600 *2
17.6 (23.6) / 3600 *2
14.5 (19.4) / 3600 *2
18.7 (25.1) / 3600 *2
14.5 (19.4) / 3600 *2
17.6 (23.6) / 3600 *2
14.5 (19.4) / 3600 *2
55.0 (40.5) / 2400 *2
9.2
1 − 2 − 3
B.T.D.C. 15 ° / 1000 min -1 (rpm) B.T.D.C. 28 ° / 3600 min -1 (rpm) *1
Distributor-less Solid State type
Natural Gas only *2
Counter-clockwise from flywheel side
Electric starting with cell starter
12 − 1.0
12-480 (Standard)
Forced lubricating by trochoid pump
Quality better than SH class
3.4 (0.90)
3.5 (0.92)
Centrifugal ball mechanical type governor
BBH : 452.5 x 415.4 x 502.53 (17.81 x 16.35 x 19.78)
SAEH : 525.5 x 415.4 x 502.53 (20.69 x 16.35 x 19.78)
BBH : Approx. 72.0 (159)
SAEH : Approx. 95.4 (210)
NOTE
• *1 Consult Kubota for further information.
• *2 With Japanese standard natural gas.
The lower heating value : 9699kcal/m3 (1090BTU/ft3).
CAUTION
• This engine is only for stationary use. e.g. oil field and emergency generator.
• The brake horse power is limited under 19kW for emission regulations.
0-3
2. PERFORMANCE CURVES
0-4
0-5
3. DIMENSIONS
WG752-G-E3BBH-1 (EG641-00000)
0-6
WG752-GL-E3BBH-1 (EG645-00000)
0-7
WG972-G-E3BBH-1 (EG801-00000)
0-8
WG972-GL-E3BBH-1(EG805-00000)
0-9
WG972-GL-E3SAEH-1 (EG802-00000)
0-10
DG972-E2-BBH-1 (EG581-00000)
0-11
DG972-E2-SAEH-1 (EG582-00000)
0-12
WG752, WG972, DG972
Flywheel : Normal SAE for Clutch No.6-1/2
Flywheel Housing : Normal SAE No.5
0-13
1. EMISSION REGULATION
CONTENTS
1. GENERAL...................................................................................................................................... 1-1
2. IMPORTANT ITEMS...................................................................................................................... 1-2
[1] Important Notice ...................................................................................................................... 1-2
[2] Emission-Related Installation Instructions............................................................................... 1-3
(1) Air Intake System .............................................................................................................. 1-3
(2) Exhaust System (See EXHAUST SYSTEM section) : (WG752, WG972)......................... 1-5
(3) High Altitude Operation (See FUEL SYSTEM section) : (WG752, WG972) ..................... 1-5
(4) Evaporative Emission Controls.......................................................................................... 1-5
(5) Engine Set Speed.............................................................................................................. 1-5
(6) Engine Labels.................................................................................................................... 1-6
(7) Vaporizer (WG752 − GL, WG972 − GL), Gas Regulator (DG972) Connections................... 1-6
(8) Tamper Resistance ........................................................................................................... 1-6
1. GENERAL
Along with E3 models, E2 models are yet available to be used in the following countries per output category.
kW, disp.
P ≤ 19
0.225 ≤ L
19 < P ≤ 30
0.825 < L ≤ 1.0
Model
WG752-G/GL-E3
WG/DF752-E2
DG972 *
WG972-G/GL-E3
WG/DF972-E2
Type
E3
E2
E2
E3
E2
North America
Available
Non-available
Available
Available
Non-available
Europe
Non-available
Available
Available
Available
Available
Japan
Available
Available
Available
Non-available
Non-available
NOTE
• * DG972 is only for stationary use.
e.g.oil field and emergency generator.
Current and future emission regulations.
2011 2012 2013
8.0/549 *
2014
HC+NO
X
/CO (g/kWh)
2015 2016 Countries
USA
CARB
EU
EPA
Canada
Japan kW, disp.
P ≤ 19
0.225 ≤ L
19 < P
L ≤ 0.825
19 < P
0.825 < L ≤ 1.0
P ≤ 19
0.225 ≤ L
19 < P ≤ 30
L ≤ 1.0
P ≤ 19
0.225 ≤ L
P < 19
0.225 ≤ L
19 ≤ P < 560
P ≤ 19
0.225 ≤ L
19 < P
2009
12.0/549
12.0/549
12.1/610
12.1/610
12.1/610
NOTE
• * with evaporative emission regulation
2010
6.5/375 *
8.0/549 *
8.0/610 *
8.0/610 *
8.0/610
12.1/610
HC/0.6 g/kWh, NO
X
/0.6 g/kWh, CO/20 g/kWh
12.1/610
None
0.8/20.6 *
1-1
2. IMPORTANT ITEMS
[1] Important Notice
There are necessary emission-related items for compliance with emission regulations.
Please confirm whether emission-related items are certain on application review
(Exhaust Emission Check Sheet).
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 follow these instructions when installing a certified engine in a piece of non-road equipment violates federal law (40CFR 1068. 105(b)),subject to fines or other penalties as described in the Clean Air Act.
The contractual agreement contract is necessary before mass-production.
1-2
[2] Emission-Related Installation Instructions
(1) Air Intake System
• Intake system means that layout of all parts from entrance of suction to air-cleaner flange.
• Kubota offers standard Air-cleaner kit. The intake parts should be installed as shown in figure below.
• If you use an OEM intake system for a spec engine, consult Kubota based on the Exhaust Emission Check Sheet before the application review.
• When the same specification engine is installed on multiple applications, you will have to inform to Kubota prior to the application review.
Also, the final intake system of each application must be confirmed at the application review and/or the Exhaust
Emission Check Sheet.
• You must install the intake system confirmed at the application review and/or the Exhaust Emission Check Sheet for mass-production. (Important)
• You should consult Kubota based on the Exhaust Emission Check Sheet whenever you change the intake system.
Do not change without consultation with Kubota.
WG752, WG972
1-3
DG972-E2-BBH
DG972-E2-SAEH, WG-972-GL-E3SAEH
1-4
(2) Exhaust System (See EXHAUST SYSTEM section) : (WG752, WG972)
• Exhaust system means the layout of all parts from exhaust manifold to exhaust exit to atmosphere.
• Kubota offers certified catalytic mufflers and catalytic converters.
You must only use Kubota certified catalyst parts (Important) and assemble the exhaust parts according to instructions as specified in the EXHAUST SYSTEM section of this manual.
Catalyst parts other than Kubota must not be used because other catalyst is not certified our engine.
You must install the exhaust system confirmed at application review and/or the Exhaust Emission Check Sheet for mass-production. (Important)
• You must consult Kubota based on the Exhaust Emission Check Sheet when you change the exhaust parts after application review. Do not change without the consultation with Kubota.
(3) High Altitude Operation (See FUEL SYSTEM section) : (WG752, WG972)
• Kubota prepared genuine altitude compensation kit.
The ultimate users must comply with the regulations through the installation of the appropriate altitude compensation kit.
(4) Evaporative Emission Controls
(See EVAPORATIVE EMISSION CONTROL section) : gasoline fuel
• If your equipments use a volatile liquid fuel (such as gasoline), they must meet the evaporative emission standards of 40 CFR part 1060,as described in §1054.112.
(5) Engine Set Speed
(Mechanical Governor specification)
• You should operate the engine within the range of engine speed set at the time of Kubota shipment
(without parasitic load).
• You should use the speed control lever and/or the governor lever when the speed change.
(Electronic Governor specification)
• If you use the electronic governor, consult Kubota before the application review.
1-5
(6) Engine Labels
• The following labels must be visible. If you install the engine in a way that makes the engine’s emission control information label hard to read during normal engine maintenance, you must place a duplicate label on the equipment, as described in 40 CFR 1068.105.
(7) Vaporizer (WG752
−
GL, WG972
−
GL), Gas Regulator (DG972) Connections
(See FUEL SYSTEM section)
• The hose length between the vaporizer (gas regulator) and carburetor (gas mixer) must be within 300 ± 20 mm
(11.8 ± 0.78 inch). Only use hose appropriate for LPG.
(8) Tamper Resistance
• Any modifications to the tamper resistance parts on this engine will cause this engine to be in noncompliance with emission regulations.
SENSOR (CRANK ANGLE) : (WG/DG972)
The ignition timing sensor also has a function of tamper resistant and the adjustment screw has been covered after adjustment at the factory. You CAN NOT adjust the ignition timing.
1-6
DISTRIBUTOR : (WG752)
The distributor is tamper resistant ; the ignition timing adjustment screw has been covered after adjustment at the factory. You CAN NOT adjust the ignition timing.
CARBURETOR : (WG752, WG972)
The carburetor is tamper resistant ; the idle mixture screw has been covered by tamper plug after adjustment at the factory. You CAN NOT adjust this screw.
LPG REGULATOR : (WG752 − GL, WG972 − GL)
LPG regulator is tamper resistant ; the main and idle pressure adjustment screw have been covered by tamper caps after adjustment at the factory. You CAN NOT adjust the screws.
1-7
NATURAL GAS REGULATOR : (DG972)
Natural gas regulator is tamper resistant; idle pressure adjustment screws have been covered by tamper caps after adjustment at the factory. You CANNOT adjust the screw.
GOVERNOR LEVER (THROTTLE ANGLE) : (Only spec model of specification that limits throttle angle)
The governor lever is tamper resistant; the governor lever adjustment screw has been covered after adjustment at the factory. You CANNOT adjust the governor lever.
1-8
2. FUEL SYSTEM
CONTENTS
1. GENERAL...................................................................................................................................... 2-1
[1] Gasoline .................................................................................................................................. 2-1
[2] LPG ......................................................................................................................................... 2-1
[3] Natural gas .............................................................................................................................. 2-1
2. FUEL DIAGRAM............................................................................................................................ 2-2
3. CAUTIONS .................................................................................................................................... 2-4
[1] For safety (WG752 − GL, WG972 − GL, DG972)........................................................................ 2-4
(1) Tightening torque and leak check for vaporizer and gas regulator.................................... 2-4
(2) Change the angle of LPG fitting of dual fuel carburetor and Gas fitting of gas mixer........ 2-4
(3) Setting and vibration limits................................................................................................. 2-4
(4) Starting the engine (WG752 − GL, WG972 − GL)................................................................. 2-4
[2] For emission regulations (WG752 − GL, WG972 − GL, DG972) ................................................ 2-5
(1) Vaporizer and Gas regulator ............................................................................................. 2-5
(2) Length of the gas hose ...................................................................................................... 2-5
4. HIGH ALTITUDE OPERATION (WG752, WG972) ....................................................................... 2-6
5. EVAPORATIVE EMISSION CONTROL (gasoline fuel)................................................................. 2-7
[1] Regulations.............................................................................................................................. 2-7
[2] Related Check Items ............................................................................................................... 2-7
1. GENERAL
Fuel by which Kubota guarantees performance.
[1] Gasoline
• Unleaded regular gasoline.
• E10 (10 % ethanol is added to gasoline)
[2] LPG
• Commercial liquid propane gas only.
• Equivalent to propane HD − 5 of GPA * standards.
• KUBOTA RECOMMENDED LPG FUEL SPECIFICATIONS
C
3
H
8
≥ 90 %
C
3
H
6
≤ 5 %
(vol %)
NOTE
• * GPA means Gas Processors Association (U.S.A)
C
4
H
10
≤ 2.5 %
[3] Natural gas
• Natural gas equivalent to city gas.
• This manual describes the performance with Japanese standard natural gas.
The lower heating value : 9699 kcal/m 3 (1090BTU/ft 3 ).
• Supply pressure of natural gas : between 0.98 and 3.45 kPa.
• Consult KUBOTA for further information of fuel used.
Others
−
2-1
2. FUEL DIAGRAM
WG752, WG972
• Mark * 1 to 4 are supplied by KUBOTA.
The other parts including hose should be procured by OEM.
The canister and the check valve should be procured by OEM if these are necessary for certification of
Evaporative Emission Regulation.
• Each pipes should be surely connected by clamp.
• When gasoline tank location is lower than carburetor, gasoline cock is not needed.
When gasoline tank location is higher than carburetor, gasoline cock should be installed.
And gasoline cock should be surely closed when engine is in stop and operated by LPG.
2-2
DG972 (See next page “CAUTIONS”)
• Mark * 1 to 2 are supplied by KUBOTA.
The other parts should be procured by OEM. (include hose)
• Each pipes should be surely connected by clamp.
2-3
3. CAUTIONS
[1] For safety (WG752
−
GL, WG972
−
GL, DG972)
• All fuel connections added to this engine must be installed by qualified personnel utilizing recognized procedures and standards.
• The non-KUBOTA installed parts, such as hoses, fittings, piping, shutoff solenoid valve should be approved for
LPG (Natural gas) use and conform to UL, CSA, NFPA, MSHA and all other applicable standards.
• An approved, listed fuel filter (gas filter) and shutoff solenoid valve (for safety purpose for DG972, two valves) must be installed between the LPG tank and Kubota LPG regulator with vaporizer before the Kubota gas regulator.
• Two shutoff solenoid valves must shut off the gas when engine stalls (DG972).
• The following standards must be followed prior to installation: UL, CSA, NFPA and MSHA standards.
(1) Tightening torque and leak check for vaporizer and gas regulator
Each fitting must be sealed with approved joint sealant compound the joint must be installed to the gas entrance of the regulator by screw with O-ring. And fittings and screw are tightened to the specified torque using a wrench
(driver), and leak check by a soap solution or its equivalent must be performed as shown in the below table.
Bubbles will indicate a loose connection.
TIGHTENING TORQUE AND LEAK CHECK PRESSURE
Tightening torque Leak check pressure
Fitting Qty.
Size
Nm kgfm ft-lb kPa kgf/cm 2 psi
GL
DG
LPG OUT
(VAPOR)
LPG IN
(LIQUID) *
WATER
IN/OUT
SCREW
1
1
2
2
R3/8
R1/4
R3/8
M4
29.4 to 58.8
19.6 to 39.2
29.4 to 58.8
1.9 to 2.9
3.0 to 6.0
2.0 to 4.0
3.0 to 6.0
0.2 to 0.3
21.7 to 43.4
14.5 to 28.9
21.7 to 43.4
1.5 to 2.2
> 9.8
> 1471
> 245
> 4.9
> 0.1
> 15
> 2.5
> 0.05
> 1.42
> 213
> 35.6
> 0.7
* NOT KUBOTA supplied
(2) Change the angle of LPG fitting of dual fuel carburetor and Gas fitting of gas mixer
The fitting may be mounted on any position since it is not sealed. The nut may by loosened using a wrench. Fitting may be changed to any specified angle. The nut should be tightened to the specified torque using a wrench as shown in the below table.
TIGHTENING TORQUE
Tightening torque
Fitting Qty.
Size Leak check
Nm kgfm ft-lb
GL
DG
LPG IN
(VAPOR)
GAS IN
(LOCK NUT)
1
1
M12x1.25
M16×1
11.8 to 26.5
19.6 to 39.2
1.2 to 2.7
2.0 to 4.0
8.7 to 19.5
14.5 to 28.9
Soap solution or its equivalent
Soap solution or its equivalent
(3) Setting and vibration limits
Install the LPG regulator (gas regulator) in UPRIGHT position, it must be installed within 4G vibration level. If not, it may not supply necessary LPG fuel to the engine.
DO NOT connect the extension hose with the air vent pipe of the gas regulator.
If do this, it may not supply necessary fuel to the engine.
(4) Starting the engine (WG752
−
GL, WG972
−
GL)
Do not move the choke lever, when LPG starting.
Otherwise, the vaporizer might brake down.
2-4
[2] For emission regulations (WG752
−
GL, WG972
−
GL, DG972)
(1) Vaporizer and Gas regulator
In order to conform to applicable EPA and CARB Emissions regulations when operating WG752 − GL,
WG972 − GL, DG972 engine, only a KUBOTA GENUINE VAPORIZER KIT (Gas regulator) can be used.
Vaporizer and Gas regulator can only be installed by an authorized KUBOTA DISTRIBUTOR or the manufacturer of the equipment in which this engine is used.
(2) Length of the gas hose
The hose length between the vaporizer (gas regulator) and carburetor (gas mixer) must be within 300 ± 20mm
(11.8 ± 0.78inch).
The incorrect use of the hose may not conform to emission regulations.
2-5
4. HIGH ALTITUDE OPERATION (WG752, WG972)
IMPORTANT
• Altitude compensation kit is applied for EPA and CARB certified engines only.
EPA and CARB emission regulations require the ultimate users of non-road SI engine, as their obligation, to adjust the emissions by installing the appropriate genuine altitude compensation kit. And the engine manufacturer must provide such kit when the engine is operated at an altitude that exceeds the standard level, as guaranteed by the engine manufacturer.
For this purpose, Kubota prepared genuine altitude compensation kit described below.
The ultimate users of SI engines must comply with the regulations through the installation of the appropriate altitude compensation kit for the altitude range where the engine will be operated.
* Prepare for the users who have lost original carburetor’s jet.
Altitude compensation kit part number: Please contact your local Kubota dealer and specify your engine type and engine serial No. Please consult your local Kubota dealer for further information on the altitude compensation kit.
CONSULT YOUR LOCAL KUBOTA DEALER FOR FURTHER INFORMATION ON THIS PROCEDURE.
Refer Exchange Manual (EG601-9939 ∆ )
NOTE
• At high altitude the carburetor air-fuel mixture will be too rich, so a high altitude carburetor kit should be used.
• Please note however that even with the high altitude kit, engine horsepower will be reduced by approximately 3.5 % for every 300 meter increase in altitude.
2-6
5. EVAPORATIVE EMISSION CONTROL
(gasoline fuel)
[1] Regulations
See the evaporative emission standards specified for your equipment in 40 CFR 1054.112 and CARB section
2754.
The standards and other requirements in 40 CFR part 1060 apply to the fuel lines, fuel tanks, fuel caps, canisters and others used or intended to your equipments and our engines.
• Nonmetal fuel lines must meet the permeation requirements specified in 40 CFR 1060.102.
• Fuel tanks must meet the permeation requirements specified in 40 CFR 1060.103 unless they are installed in equipment certified to meet diurnal emission standards under 40 CFR 1060.105 (e).
• Your equipment must have a tethered fuel cap. Fuel caps must also include a visual, audible, or other physical indication that they have been properly sealed (EPA 40 CFR 1060.101 (f) (1) (i), CARB section 2756).
• Your equipment must have proper carbon canisters that are installed on the fuel tanks subject to running loss or diurnal emission standards (EPA 40 CFR 1060.104 (b) (1), CARB section 2754).
KUBOTA recommendation
Equipment manufactures
Objective parts
Fuel Hose, Fuel Tank,
Tank Cap, Canister
* purge port
Regulation requirements
Use certified parts
Remarks
40 CFR 1054.112
CARB section 2754
KUBOTA (engine) Add the purge port
* To route running loss emissions into the engine intake system, Kubota prepared the purge port on the air-cleaner flange. You may use this purge port to combust fuel vapors vented from the fuel tank.
[2] Related Check Items
You must confirm that the fuel parts layout confirmed at application review.
Please confirm the following items.
• Installation of heat cover, fuel hose, etc. confirmed.
• The temperature of the fuel in the fuel tank must be lower than temperature to prevent fuel boiling at all operating conditions.
• If you use a carbon canister, the capacity of fuel tank and the carbon canister is confirmed.
• The liquid gasoline does not enter from the fuel tank to the evaporative canister at all operating conditions
(at inclination, volume expansion by heat, surface level difference by vibration and etc).
NOTE
• It is equipment manufacturer’s responsibility to make sure the fuel system will comply with the applicable evaporative emissions regulation.
• It is equipment manufacturer’s responsibility to test and confirm the evaporative system will not cause engine performance issues at any operating condition.
2-7
3. EXHAUST SYSTEM
CONTENTS
1. GENERAL (WG752, WG972)........................................................................................................ 3-1
2. EXCEPTIONS (WG752, WG972).................................................................................................. 3-2
3. RELATED CHECK ITEMS............................................................................................................. 3-3
4. FOR MASS PRODUCTION (WG752, WG972) ............................................................................. 3-4
1. GENERAL (WG752, WG972)
Kubota offers certified catalytic mufflers and catalytic converters.
You should use only Kubota catalyst parts certified and assemble the exhaust parts as follows and/or the Exhaust
Emission Check Sheet. Catalyst parts other than Kubota must not be used because other catalyst is not certified our engine.
You must consult Kubota when you change the exhaust parts after application review and/or the Exhaust
Emission Check Sheet.
• You must install the catalyst parts directly to the exhaust manifold through the gasket.
See SOS option manual about selectable combinations of the catalyst parts and the exhaust manifold.
• When you use the converter, you must install the converter in the direction where the elbow side of the converter is attached to the exhaust manifold.
• Tighten with the specified torque to avoid exhaust gas leak. (Exhaust Manifold, Catalyst)
When you use bolt to tighten the catalyst, the material of the bolt must be SAE10B23H.
IMPORTANT
• Handle catalyst parts with care. Damaged or catalyst that has been ‘dropped’ cannot be used.
3-1
2. EXCEPTIONS (WG752, WG972)
When it is necessary to offset the installation positions of the catalyst parts to avoid part interference or etc, a spacer can be used between the exhaust manifold and catalyst parts.
IMPORTANT
Only for WG752 with all exhaust manifold
• Allowable max thickness of the spacer is 13 mm (0.51 inch).
Only for WG972 with the exhaust manifold (EG511-1231 ∆ , EG511-1233 ∆ )
• Allowable max thickness of the spacer is 20 mm (0.78 inch).
CAUTION
• Kubota gasket must be installed on both sides of the spacer.
• The surface-roughness of both Sides of the spacer must be less than 3.2a (3.2 µm).
And allowance of levelness must be less than 0.2 mm.
• The material of the spacer must be corresponding of SPHC.
• Tighten torque must be within 23.5 to 27.5 N·m (17.33 to 20.28 lb·ft)
• When change the stud on the exhaust manifold or use the bolt to tighten, the material of the stud and the bolt must be SAE10B23H.
• Refer to SOS option manual for the installation pitch and etc. of exhaust manifold and catalyst parts.
3-2
3. RELATED CHECK ITEMS
You must confirm that the other parts such as exhaust hoses layout around the catalyst parts confirmed at the time of the application review.
If the layout is not sure, the catalyst parts might be damaged.
Please confirm the following items.
• Installation of the heat cover confirmed.
• Installation of the stay of exhaust system confirmed at vibration test.
• Installation of the parts installed after Kubota catalyst parts.
• Installation of the other parts (ex. water cover, water cap, etc.) confirmed.
Water must be prevented from entering into exhaust catalyst.
• You confirm that the wiring of igniter and IG coil do not come off because of vibration, and not to disconnect during operation. If wiring comes off or disconnect, catalyst parts might be damaged and the exhaust temperature become very high.
• You must confirm layout of the parts (ex. add the cover etc) around the catalyst parts to avoid a fire because there is possibility that the surface of catalyst parts the exhaust become a high temperature when the engine abnormality driving. And you must guide user to stop engine immediately when the engine abnormality driving.
• When you use the Kubota catalytic converter with non-Kubota mufflers, it is necessary to confirm that the exhaust system back pressure is less than allowable limit. Refer to the curve below.
Check system back pressure, when you use a tail pipe with Kubota catalytic muffler, too.
Position to measure back pressure is at the outlet of exhaust manifold. Refer to the figurer below.
3-3
4. FOR MASS PRODUCTION (WG752, WG972)
The manufacturing number and the catalyst number are marked on surfaces of the catalyst parts. You must keep record of the catalyst identification information with the engine model and engine serial number that the catalyst is installed. (Check Item)
The catalyst parts are shipped with bar-code identification information.
• Catalyst Identification Marks
#1 Part number
#2 Manufacturing number
#3 Catalyst number
3-4
4. ELECTRICAL SYSTEM
CONTENTS
1. WIRING DIAGRAM........................................................................................................................ 4-1
2. CAUTION (WG752, WG972)......................................................................................................... 4-3
1. WIRING DIAGRAM
WG752
4-1
WG972, DG972
4-2
2. CAUTION (WG752, WG972)
• Please confirm that the electrical wiring for the igniter and IG coil(s) do not disconnect due to vibration, poor routing or tension on wire and connector.
If wires become disconnected, catalyst parts may be damaged and very high exhaust gas temperature may result.
• Please confirm that the connecting order of cylinder number of the igniter and IG coil(s) do not make a mistake at mass-production and maintenance.
If the connecting order is not correct, catalyst parts may be damaged and very high exhaust gas temperature may result.
4-3
3
TECHNICAL INFORMATION
CONTENTS
1. BRAKE HORSE POWER .............................................................................................................. 1-1
2. FUEL CONSUMPTION.................................................................................................................. 1-2
3. SOUND PRESSURE LEVEL......................................................................................................... 1-3
4. AIR REQUIREMENTS................................................................................................................... 1-4
[1] Combustion air requirements (At 25 deg.C and 1000 hPa)..................................................... 1-4
[2] Cooling air requirements (At 25 deg.C and 1000 hPa)............................................................ 1-5
[3] Combustion and cooling air requirements (At 25 deg.C and 1000 hPa) ................................. 1-6
5. EXHAUST GAS VOLUME ............................................................................................................. 1-7
6. HEAT REJECTION TO COOLANT ............................................................................................... 1-8
7. WATER FLOW RATE.................................................................................................................. 1-10
[1] WATER FLOW RATE OF WG752 ........................................................................................ 1-10
[2] WATER FLOW RATE OF WG972, DG972 ........................................................................... 1-11
8. CENTER OF GRAVITY ............................................................................................................... 1-12
9. MASS ELASTIC SYSTEM........................................................................................................... 1-13
[1] EQUIVALENT TORSIONAL VIBRATION DATA ................................................................... 1-13
10. UNBALANCED FORCES ............................................................................................................ 1-14
[1] BASE DATA .......................................................................................................................... 1-14
[2] UNBALANCED INERTIA FORCE AND COUPLE................................................................. 1-14
[3] AN EXAMPLE OF CALCULATION ....................................................................................... 1-15
1. BRAKE HORSE POWER
SAE J1349
Model Fuel Output
WG752
Gasoline
LPG
Net intermittent
Net continuous
Net intermittent
Net continuous
HP
PS kW
HP kW
HP
PS kW
PS kW
HP
PS
14.5
8.2
11.0
11.1
11.8
12.0
10.7
14.3
2000
11.3
15.1
15.4
8.8
Model
WG972
DG972
Fuel
Gasoline
LPG
NG *
Output
Net intermittent
Net continuous
Net intermittent
Net continuous
Net intermittent
Net continuous
NOTE
• Conversion rates
– 1 kW=1.35962 PS=1.34048 HP
– 1 PS=0.7355 kW=0.985925 HP
– 1 HP=0.7457 kW=1.01428 PS
• * Fuel detail
Japanese standard gas
– lower heating value : 9699 kcal/m 3 (1090 BTU/ft 3 )
– supply pressure : 0.98 − 2.45 kPa (2.27 − 5.68 oz/inch 2 )
16.0
16.2
10.0
13.4
14.7
19.8
20.0
11.9
2000
14.8
19.8
20.1
12.1
16.2
16.4
13.6
8.3
11.1
11.3
PS kW
HP
PS
HP
PS kW
HP kW
HP
PS kW kW
HP
PS kW
HP
PS
Engine Speed (min -1 (rpm))
2400 2800 3200
13.8
18.5
18.8
10.8
15.6
20.9
21.2
12.2
16.7
22.4
22.7
13.1
14.5
14.7
13.1
17.6
16.4
16.6
14.9
20.0
17.6
17.8
16.0
21.4
17.8
10.2
13.7
13.9
20.3
11.5
15.4
15.6
21.8
12.4
16.6
16.9
19.3
19.6
13.9
18.6
17.8
23.8
24.1
14.4
Engine Speed (min -1 (rpm))
2400 2800 3200
17.8
23.9
24.2
14.6
19.5
19.8
20.6
27.6
28.0
16.9
22.6
22.9
22.2
29.8
30.2
18.2
24.4
24.7
18.9
11.4
15.3
15.5
20.1
26.9
27.3
16.3
21.8
22.1
16.1
21.6
21.9
13.3
17.8
18.1
23.7
14.3
19.2
19.4
23.1
23.4
17.4
23.3
21.2
28.5
28.9
17.2
23.5
23.8
17.6
23.6
22.0
29.5
29.9
17.5
3600
23.1
31.0
31.4
18.9
25.4
25.7
23.9
14.5
19.4
19.7
22.3
12.7
17.0
17.3
18.0
18.2
16.4
22.0
3600
17.1
22.9
23.2
13.4
1-1
2. FUEL CONSUMPTION
Specific at net intermittent (SAE J1349)
Model Fuel Output
WG752
Gasoline
LPG
Brake horse power
Fuel consumption
Brake horse power
Fuel consumption
HP
PS g/kWh g/HPh g/PSh lb/HPh kW
HP
PS g/kWh g/HPh g/PSh lb/HPh kW
Model Fuel Output
WG972
DG972
Gasoline
LPG
NG
Brake horse power
Fuel consumption
Brake horse power
Fuel consumption
Brake horse power
Fuel consumption
NOTE
• Conversion rates
– 1 kW=1.35962 PS=1.34048 HP
– 1 PS=0.7355 kW=0.985925 HP
– 1 HP=0.7457 kW=1.01428 PS
– 1 kg=2.20462 lb (1 g=0.00220462 lb)
– 1 lb=0.45359 kg
HP
PS g/kWh g/HPh g/PSh lb/HPh kW
HP kW
HP
PS g/kWh g/HPh g/PSh lb/HPh kW
PS g/kWh g/HPh g/PSh lb/HPh
242
239
0.535
10.7
14.3
14.5
301
225
221
0.495
2000
11.3
15.1
15.4
325
301
297
0.664
14.7
19.8
20.0
301
224
2000
14.8
19.8
20.1
404
221
0.495
10.0
13.4
13.6
380
283
279
0.625
1-2
17.6
17.8
296
221
218
0.487
Engine Speed (min -1 (rpm))
2400 2800 3200
13.8
18.5
18.8
315
15.6
20.9
21.2
323
16.7
22.4
22.7
343
235
232
0.518
13.1
241
238
0.531
14.9
256
252
0.564
16.0
20.0
20.3
306
228
225
0.503
21.4
21.8
322
240
237
0.530
23.8
24.1
287
214
211
0.472
13.9
18.6
18.9
310
231
228
0.510
Engine Speed (min -1 (rpm))
2400 2800 3200
17.8
23.9
24.2
398
20.6
27.6
28.0
371
22.2
29.8
30.2
351
297
293
0.654
17.8
276
273
0.610
20.1
262
258
0.577
21.2
26.9
27.3
286
213
210
0.471
16.1
21.6
21.9
298
222
219
0.490
23.7
293
219
216
0.482
28.5
28.9
292
218
215
0.480
17.4
23.3
249
245
0.549
22.0
29.5
29.9
299
223
3600
23.1
31.0
31.4
334
220
0.492
17.6
23.6
23.9
285
213
210
0.469
259
255
0.571
16.4
22.0
22.3
337
251
248
0.554
3600
17.1
22.9
23.2
347
3. SOUND PRESSURE LEVEL
unit dB(A) min -1 (rpm) Load ratio Fuel
Gasoline
WG752
3850
3600
1500
0/4
4/4
0/4
LPG
Gasoline
LPG
Gasoline
LPG
Sound pressure at 1 m (3.3 ft)
89
87
91
89
72
72 unit dB(A)
WG972
DG972 min -1 (rpm)
3850
3600
1500
0/4 × 1500
Load ratio
0/4
4/4
0/4
0/4 × 1500
Fuel
Gasoline
LPG
NG
Gasoline
LPG
NG
Gasoline
LPG
NG
These data show the average sound pressure level at four points.
NOTE
• Measurement conditions: With radiator, cooling fan, air cleaner and muffler.
Sound pressure at 1 m (3.3 ft)
90
90
90
92
92
92
72
72
72
1-3
4. AIR REQUIREMENTS
[1] Combustion air requirements (At 25 deg.C and 1000 hPa)
Model
WG752
Fuel
Gasoline
LPG
Output
Combustion air requirements
Combustion air requirements
L/sec m 3 /h in 3 /sec ft 3 /min
L/sec m 3 /h in 3 /sec ft 3 /min
2000
10.48
37.74
640
22.21
9.99
35.96
610
21.16
Engine Speed (min -1 (rpm))
2400 2800 3200
12.58
45.29
768
26.65
11.99
43.16
732
25.40
14.68
52.84
896
31.09
13.99
50.35
853
29.63
975
33.86
16.77
60.38
1024
35.54
15.98
57.54
Model Fuel Output
WG972
DG972
Gasoline
LPG
NG
Combustion air requirements
Combustion air requirements
Combustion air requirements
NOTE
• Combustion air requirements calculating formula
• Q1=Vh·N·C· η ·10 -3
– Q1 : Amount of intake air (m 3 /min)
– Vh : Total displacement (L)
– N : Engine speed (min -1 (rpm))
– C : Coefficient=0.5
– η : Intake efficiency
Gasoline : 0.85
LPG : 0.81
Natural Gas: 0.77
L/sec m 3 /h in 3 /sec ft 3 /min
L/sec m 3 /h in 3 /sec ft 3 /min
L/sec m 3 /h in 3 /sec ft 3 /min
12.99
46.75
793
27.51
12.35
44.44
753
26.16
2000
13.63
49.06
832
28.87
Engine Speed (min -1 (rpm))
2400 2800 3200
16.35
58.87
998
34.65
19.08
68.69
1164
40.42
21.81
78.50
1331
46.20
15.58
56.10
951
33.02
18.18
65.45
1110
38.52
20.78
74.81
1268
44.02
14.81
53.33
904
31.39
17.28
62.22
1055
36.62
19.75
71.11
1205
41.85
23.38
84.16
1427
49.53
22.22
80.00
1356
47.08
3600
24.53
88.31
1497
51.97
3600
18.87
67.93
1152
39.98
17.98
64.74
1097
38.10
1-4
[2] Cooling air requirements (At 25 deg.C and 1000 hPa)
Model
WG752
Fuel
Gasoline
LPG
Output
Cooling air requirements
Cooling air requirements
L/sec m 3 /h in 3 /sec ft 3 /min
L/sec m 3 /h in 3 /sec ft 3 /min
2000
359.4
1294
21933
761.5
349.2
1257
21307
739.7
Engine Speed (min -1 (rpm))
2400 2800 3200
418.8
1508
25554
887.2
413.8
1490
25251
876.7
476.5
1715
29078
1009.5
477.6
1719
29146
1011.9
33475
1162.2
550.6
1982
33598
1166.5
548.6
1975
Model Fuel Output
WG972
DG972
Gasoline
LPG
NG
Cooling air requirements
Cooling air requirements
Cooling air requirements
L/sec m 3 /h in 3 /sec ft 3 /min
L/sec m 3 /h in 3 /sec ft 3 /min
L/sec m 3 /h in 3 /sec ft 3 /min
NOTE
• Above data is decided by following conditions.
– Using the standard radiator.
– Engine is run as open unit.
2000
571.2
2056
34859
1210
469.8
1691
28668
995
420.6
1514
25668
891
Engine Speed (min -1 (rpm))
2400 2800 3200
737.2
2654
44988
1562
824.7
2969
50328
1747
833.9
3002
50886
1767
586.7
2112
35800
1243
686.6
2472
41896
1455
734.2
2643
44806
1556
518.3
1866
31628
1098
600.2
2161
36625
1272
633.0
2279
38630
1341
3600
764.8
2753
46668
1620
722.3
2600
44077
1530
577.9
2080
35264
1224
3600
651.3
2345
39742
1379.8
672.0
2419
41005
1423.6
1-5
[3] Combustion and cooling air requirements
(At 25 deg.C and 1000 hPa)
Model
WG752
Fuel
Gasoline
LPG
Output
Combustion and cooling air requirements
Combustion and cooling air requirements
L/sec m 3 /h in 3 /sec ft 3 /min
L/sec m 3 /h in 3 /sec ft 3 /min
2000
369.9
1331.6
22572
783.7
359.1
1292.9
21916
760.9
Engine Speed (min -1 (rpm))
2400 2800 3200
431.3
1552.8
26322
913.8
491.2
1768.3
29974
1040.6
567.4
2042.5
34622
1202.0
425.8
1532.8
25982
902.0
491.6
1769.8
30000
1041.5
564.5
2032.4
34450
1196.0
Model
WG972
DG972
Fuel
Gasoline
LPG
NG
Output
Combustion and cooling air requirements
Combustion and cooling air requirements
Combustion and cooling air requirements
L/sec m 3 /h in 3 /sec ft 3 /min
L/sec m 3 /h in 3 /sec ft 3 /min
L/sec m 3 /h in 3 /sec ft 3 /min
2000
584.9
2105.5
35690
1239.1
482.8
1738.0
29461
1022.8
433.0
1558.7
26422
917.3
Engine Speed (min -1 (rpm))
2400 2800 3200
753.6
2712.9
45986
1596.5
602.2
2168.1
843.8
3037.7
51492
1787.7
704.7
2537.1
855.7
3080.5
52217
1812.9
755.0
2718.1
36751
1275.9
533.1
1919.2
32532
1129.4
43005
1493.1
617.5
2222.9
37680
1308.2
46074
1599.6
652.8
2350.1
39835
1383.0
NOTE
• Cooling fan and fan pulley specifications (Cooling fan Part No. 15881-7411 ∆ )
Item
Fan diameter
No. of blade and type of shape
Diameter of fan driving pulley
300 mm (11.81 in)
4, S type
100 mm (3.94 in)
Diameter of fan pulley
• Conversion rates
1 L=61.0237 in 3 =0.035315 ft
1 ft 3 =28.3168 L
1 L/sec=3.6 m 3 /h=2.1189 ft 3
3
/min
84 mm (3.31 in)
3600
789.3
2841.5
48165
1672.2
745.7
2684.5
45504
1579.8
600.1
2160.4
36620
1271.4
3600
670.1
2412.5
40894
1419.7
689.9
2483.8
42102
1461.7
1-6
5. EXHAUST GAS VOLUME
At 25 deg.C and 1000 hPa
Model Fuel Output
WG752
Gasoline
LPG
Gas volume
Gas volume
L/sec m 3 /h in 3 /sec ft 3 /min
L/sec m 3 /h in 3 /sec ft 3 /min
1500
22.58
81.3
1378
47.8
21.52
77.48
1313
45.6
Model
WG972
DG972
Fuel
Gasoline
LPG
NG
Output
Gas volume
Gas volume
Gas volume
L/sec m 3 /h in 3 /sec ft 3 /min
L/sec m 3 /h in 3 /sec ft 3 /min
L/sec m 3 /h in 3 /sec ft 3 /min
2000
39.15
140.93
2389
82.9
37.30
134.29
2276
79.0
35.46
127.67
2164
75.1
2000
Engine Speed (min -1 (rpm))
2400 2800 3200
30.11
108.4
1837
63.8
36.14
130.09
2205
76.6
42.16
151.77
2573
89.3
48.18
173.45
2940
102.1
28.69
103.3
1751
60.8
34.43
123.96
2101
73.0
40.17
144.62
2451
85.1
45.91
165.29
2802
97.3
Engine Speed (min -1 (rpm))
2400 2800 3200
46.98
169.11
2867
99.5
44.76
161.15
54.80
197.30
3344
116.1
52.23
188.01
62.63
225.48
3822
132.7
59.69
214.87
2732
94.8
42.55
153.19
2597
90.2
3187
110.6
49.65
178.73
3030
105.2
3642
126.5
56.74
204.26
3462
120.2
4098
142.3
63.83
229.8
3895
135.2
3600
70.46
253.67
4300
149.3
67.15
241.73
3600
54.20
195.13
3308
114.8
51.65
185.95
3152
109.4
NOTE
• Conversion rates
1 L=61.0237 in 3 =0.035315 ft 3
1 ft 3 =28.3168 L
1 L/sec=3.6 m 3 /h=127.133 ft 3 /min
1-7
6. HEAT REJECTION TO COOLANT
Specific at net intermittent (SAE J1349)
Engine Speed (min -1 (rpm))
Model Fuel Output
2000 2400 2800 3200
WG752
Gasoline
LPG
Brake horse power
Fuel consumption
Heat rejection to cooling water
Brake horse power
Fuel consumption
Heat rejection to cooling water
7859
31631
13.1
17.6
17.9
296
221
218
13.8
18.5
18.8
315
235
231
0.517
32.90
0.487
32.51
7766
31255
6891
27735
10.7
14.3
14.5
301
224
221
11.3
15.1
15.3
325
243
239
0.535
28.85
0.495
28.02
6694
26944 kcal/h
BTU/h kW
HP
PS g/kWh g/HPh g/PSh kW
HP
PS g/kWh g/HPh g/PSh lb/HPh
MJ/h lb/HPh
MJ/h kcal/h
BTU/h
8846
35604
14.9
20
20.3
306
228
225
15.6
21
21.3
323
241
238
0.531
37.03
0.502
37.12
8867
35688
10110
40689
16
21.5
21.8
322
240
237
16.7
22.4
22.7
343
256
252
0.564
42.32
0.53
42.16
10072
40539
NOTE
• Heat rejection to cooling water calculating formula
• Ho=Hu·Ne·be·i
Ho : Heat rejection to cooling water
Hu : Fuel lower heating value
Gasoline : 42.7 MJ/kg, 10201 kcal/kg, 18361 BTU/lb
LPG : 47.3 MJ/kg, 11300 kcal/kg, 20339 BTU/lb
NG : 49.5 MJ/kg, 11828 kcal/kg, 21285 BTU/lb
Japanese standard gas lower heating value : 9699 kcal/m 3 (1090 BTU/ft 3 ) supply pressure : 0.98 − 2.45 kPa (2.27 − 5.68 oz/inch 2 )
Ne : Brake horse power be : Specific fuel consumption ratio i : Dispersion ratio to cooling water
259
255
0.571
45.91
10967
44141
16.4
22
3600
17.1
23
23.3
347
22.3
337
251
248
0.554
47.37
11316
45543
1-8
Model Fuel Output
WG972
DG972
Gasoline
LPG
NG
Brake horse power
Fuel consumption
Heat rejection to cooling water
Brake horse power
Fuel consumption
Heat rejection to cooling water
Brake horse power
Fuel consumption
Heat rejection to cooling water g/HPh g/PSh lb/HPh
MJ/h kcal/h
BTU/h lb/HPh
MJ/h kcal/h
BTU/h kW
HP
PS g/kWh kcal/h
BTU/h kW
HP
PS g/kWh g/HPh g/PSh kW
HP
PS g/kWh g/HPh g/PSh lb/HPh
MJ/h
NOTE
• Heat rejection to cooling water calculating formula
• Ho=Hu·Ne·be·i
Ho : Heat rejection to cooling water
Hu : Fuel lower heating value
Gasoline : 42.7 MJ/kg, 10201 kcal/kg, 18361 BTU/lb
LPG : 47.3 MJ/kg, 11300 kcal/kg, 20339 BTU/lb
NG : 49.5 MJ/kg, 11828 kcal/kg, 21285 BTU/lb
Japanese standard gas lower heating value : 9699 kcal/m 3 (1090 BTU/ft 3 ) supply pressure : 0.98 − 2.45 kPa (2.27 − 5.68 oz/inch 2 )
Ne : Brake horse power be : Specific fuel consumption ratio i : Dispersion ratio to cooling water
10.0
13.4
13.6
380
283
279
0.624
32.73
7805
30968
20.1
301
224
221
0.494
36.49
8717
34589
301
297
0.664
44.37
10599
42058
14.7
19.8
2000
14.8
19.8
20.1
404
231
228
0.509
33.49
7979
31638
0.471
37.80
9031
35837
13.9
18.6
18.9
310
11349
45035
17.8
23.8
24.1
287
214
211
Engine Speed (min -1 (rpm))
2400 2800 3200
17.8
23.9
24.2
398
20.6
27.6
28.0
371
22.2
29.8
30.2
351
297
292
0.654
47.51
276
272
0.609
54.81
262
258
0.577
58.90
13094
51957
20.1
26.9
27.3
286
213
210
14072
55840
21.2
28.5
28.9
292
218
215
0.470
45.63
10900
43252
16.1
21.6
21.9
298
222
219
0.489
39.90
9529
37770
219
216
0.483
44.67
10683
42398
0.480
51.87
12391
49167
17.4
23.3
23.7
293
17.6
23.6
23.9
285
213
210
0.47
48.91
11713
46510
29.9
299
223
220
0.491
61.28
14640
58094
249
245
0.549
64.88
15501
61509
22.0
29.5
3600
23.1
31.0
31.4
334
1-9
7. WATER FLOW RATE
[1] WATER FLOW RATE OF WG752
Water Pump
Fan Pulley Dia.
Fan Drive Pulley Dia.
Thermostat
1E051-7303 ∆
84 mm (3.31 in.)
100 mm (3.94 in.)
19203-7301 ∆
NOTE
• The flow is with std. radiator.
• Including engine block, radiator and piping resistance.
1-10
[2] WATER FLOW RATE OF WG972, DG972
Water Pump
Fan Pulley Dia.
Fan Drive Pulley Dia.
Thermostat
1E051-7303 ∆
84 mm (3.31 in.)
100 mm (3.94 in.)
19434-7301 ∆
NOTE
• The flow is with std. radiator.
• Including engine block, radiator and piping resistance.
1-11
8. CENTER OF GRAVITY
1. With standard flywheel and rear-end plate
Model
Dry weight kg (lb)
WG752
WG/DG972
61.7 (136)
72 (159)
2. With SAE flywheel and flywheel housing
Model
Dry weight kg (lb)
WG752
DG972
89 (196.2)
95.4 (210)
X mm (in)
2 (0.08)
− 25.5 ( − 1.00)
X mm (in)
1 (0.04)
− 10 ( − 0.39)
Center of gravity
Y mm (in)
64 (2.52)
73.3 (2.89)
Center of gravity
Y mm (in)
47 (1.85)
28 (1.1)
NOTE
• Cooling water and lubricating oil weight is not included in above engine weight.
Z mm (in)
171 (6.73)
179.5 (7.07)
Z mm (in)
188 (7.4)
207 (8.15)
1-12
9. MASS ELASTIC SYSTEM
[1] EQUIVALENT TORSIONAL VIBRATION DATA
MODEL
WG752
LV
30670
EQUIVALENT LENGTH (cm)
L1 L2
5136 5136
NOTE
• Flywheel 16861-25110, V-Pulley 16861-74280
MODEL
WG/DG972
LV
35082
EQUIVALENT LENGTH (cm)
L1 L2
4528 4528
NOTE
• Flywheel EG511-25110, V-Pulley 16861-74280
Lf
2824
MODEL
DG972
LV
35082
EQUIVALENT LENGTH (cm)
L1 L2
4528 4528
Lf
2824
NOTE
• Flywheel EG582-25110, V-Pulley 16861-74280
Lf
3673
JV
0.013
POLAR MOMENT OF INERTIA (kgfcm-sec 2 )
J1 J2 J3
0.017
0.011
0.018
Jf
0.392
JV
0.013
POLAR MOMENT OF INERTIA (kgfcm-sec 2 )
J1
0.026
J2
0.026
J3
0.026
Jf
0.523
JV
0.013
POLAR MOMENT OF INERTIA (kgfcm-sec 2 )
J1 J2 J3
0.026
0.026
0.026
Jf
1.281
1-13
10. UNBALANCED FORCES
[1] BASE DATA
Model
WG752
WG/DG972
I (m)
0.0980
0.0980
r (m)
0.0340
0.0368
L (m)
0.0720
0.0800
Wp (kgf)
0.4320
0.3685
Bore (mm)
68.0
74.5
[2] UNBALANCED INERTIA FORCE AND COUPLE
Model
WG752
WG/DG972
No. of Cylinder
2
Cylinder Bore
(mm)
68.0
2 74.5
Order
1
2
1
2
Fz
0
0
0
0
Npy
0.000093
0.000065
0.000096
0.000072
Stroke (mm)
68.0
73.6
(x ω 2 )
Noz
0.000093
0
0.000096
0
1-14
[3] AN EXAMPLE OF CALCULATION
Calculation condition ω 2
Engine model : WG752
Engine speed : 3600 min -1 (rpm)
Engine model : WG/DG972
Engine speed : 3600 min -1 (rpm)
(2 x π × 3600/60) 2 = 142122
(2 x π × 3600/60) 2 = 142122
Fz (kgf)
Npy
(kgf-m)
Noz
(kgf-m)
Fz (kgf)
Npy
(kgf-m)
Noz
(kgf-m)
1
2
1
2
1
2
Order
1
2
1
2
1
2
Fz, Npy, Noz
Caluculation
0
0
0.000093 × 142122 =13.2 kg
0.000065 × 142122 =9.2 kg
0.000093 × 142122 =13.2 kg
0
0
0
0.000096 × 142122 =13.6 kg
0.000072 × 142122 =10.2 kg
0.000096 × 142111 =13.6 kg
0
1-15
Application Check Sheet
for Kubota Small SI Engine
Engine Model: Basic Engine Model:
Code No.
Overload:
ISO-2534,3046
Continues:
ISO-2534,3046
Idling Speed:
Application:
kW( ps) min -1 (rpm) kW( ps) min -1 (rpm)
High/ 㨪 min -1 (rpm),
Code No.
Overload:
ISO-2534,3046
Continues:
ISO-2534,3046
Low/ 㨪
kW( ps) min -1 (rpm) kW( ps) min -1 (rpm) min -1 (rpm)
Engine Engineering Dept.
KUBOTA Corporation
,20
Revision
,20 ,20 ,20
Issued
,20 confirmed
Equipment Maker (Customer)
Your signature
Date: / / 20
Issue No.
KUBOTA (Engine) Distributor
Reg.No.
KUBOTA Corporation
Your signature
Date: / / 20
Manager
Engine Engineering Dept.
KUBOTA Corporation
Manager
Engine Global Marketing Dept.
11/jan/01
1
KUBOTA Industrial Engine Application Review
1) Purpose :
One of the policies of KUBOTA Corporation Engine Division (hereinafter referred as 㵰 KUBOTA 㵱 ) is to assist equipment manufacturers in the application of KUBOTA engines with the objective of improving the overall equipment quality. One of the methods used to achieve this objective is the review, testing and documentation
(Installation Review) of an engine installation with the equipment manufacturer.
Customer satisfaction is directly related to the proper engine application in the end equipment. It is important to obtain the best possible installation in all equipment / applications to insure repeat sales, optimum equipment reputation and reduced warranty claims.
KUBOTA is responsible for performing Engine Application Review for KUBOTA direct OEM and KUBOTA
Distributors are responsible for Distributor OEM and retail applications respectively. In case KUBOTA Distributors request KUBOTA the supply of OEM Specified Engine, completed Engine Application Review forms should be sent to KUBOTA Engine Engineering Dept. via KUBOTA Engine Global Marketing Dept.. KUBOTA Engine
Engineering Department will review and inform the registration number will comments to KUBOTA Distributors via
KUBOTA Engine Global Marketing Dept.
Improper application or installation without a registered Application Review can result in denial of warranty.
2) Application Review Forms :
Following forms are used for KUBOTA to review its Direct OEM product. KUBOTA Distributors are recommended to use the same forms for the review.
This check sheet describes only 'B-1', 'b-2' and 'b-3' that should be checked specially for Small SI Engines.
Please use the Application Check Sheet for Diesel Engines, together.
㩷㩷䊶 Review Form - (a) :
- Engine Application Sheet 1/3 : required technical factors and environmental conditions
䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭㩷 in installation (A-1)
- Engine Application Sheet 2/3 : power requirement as per each PTO system and
䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭㩷 engine model recommendation (A-2)
- Engine Application Sheet 3/3 : product type, engine mounting system and
䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭㩷 other technical informations (A-3)
- Engine Performance, Maintenance and Safety Check Sheet (B-1) for Small SI Engines
- Engine Specification Sheet (B-2---1/2, 2/2)
䇭䊶 Review Form - (b) :
- All of the 㵰 Review Form - (a) 㵱 sheets and
- Engine Operation Measuring Data Sheet (b-1)
- Temperature Measuring Sheet (b-2) for Small SI Engines
- Vibration Measuring Sheet (b-3) for Small SI Engines
䇭䊶 New part of Modification Request and Part Change Information & Agreement Sheet (C-1), (C-2)
3) Supplement :
The purpose of this application review is, as mentioned in the paragraph 1), to assist equipment manufactures in the application of Kubota engines with the objective of improving overall equipment quality. In this object, Kubota and the Kubota distributors assume no and hereby disclaim any additional liability in undertaking this review, including but not limited to, any liability under any express or implied warranties, applicable national, state or local laws, regulations or ordinances, or otherwise. The customer is responsible for accurately and fully completing this engine application review and returning it to Kubota or the Kubota distributors, as the case maybe.
The customer is further responsible for confirming the suitability for different operating conditions or legal regulations and requirements at each delivery destination.
11/jan/01
2
B
-1 Performance & Maintenance and Safety Check Sheet for Small SI Engines
Unit model / serial no. :
Engine Model :
Checked place at :
Product Name :
Engine serial no.
:
Loadng condition :
1. Engine oil : checking items
Oil temp. (below 120 °C (248 °F) under max load and below 110 °C (230 °F) at continuous operation)
- oil level checking
- oil supply
- oil draining
- oil filter replacement
2. Cooling system
- obstacles, radiator front and rear
- clearance, fan and radiator core / shroud
- prevention of re-circulation cooling air
- prevention dust of radiator
- checking, closed by dust on radiator
- capacity (radiator locally supplied)
- antifreeze coolant
- reserve tank air to boil
(ATB = above 49 °C (120 °F), at continuous operation)
- water supply and level checking
- water draining
- fan belt adjustment
- fan best replacement
- danger of scald by overblown hot water
- danger of scald by damages of radiator cap, Hoses
3. Inlet and Exhaust
- "Exhaust Emission Check Sheet" agreement
- entrance of rain, dust and hot air from air cleaner
- capacity (locally supplied air cleaner)
- back pressure of muffler (locally supplied muffler)
- check, cleaning and replacement of air cleaner
Element
- objects, easy burn, on or over muffler
- exhaust direction
(not toward human being, battery, fuel system)
- cover to prevent a burn
- entrance of water from the exhaust exit by rain and
washing
- cover to prevent water, stone, etc (catalyst parts)
- position, combination with exhaust manifold
(catalyst parts)
4. Fuel system
- filter at fuel tank, supply port
- waved fuel piping, fuel drop to fuel tank
- air bleeding, after fitter change or fuel empty
- electric fuel feed pump for low positioned tank
- fuel supply to fuel tank
- fuel draining from tank bottom
- air bleeding from fuel line
- check, cleaning, replacement of fuel filter judged
(e.g. Battery dropped out)
- alternator L-terminal load > 5mA, when short circuit
protector is adopted.
- Do NOT connect relay with alternator L-terminal when
short circuit is not adopted
6. Others
- no excessive force on engine speed control lever
- no resonance point between low and high engine
Operation
- engine oil, specified oil is used
Requirement
- side PTO, correct
- guard for rotating
- safety label checking items
- fuel pipe's contact with hot part
- fuel pipe's contact with engine or machine
- caution label on fuel type and fire
- temperature of fuel system
must not beyond 53 °C or 127 °F
- certified fuel system for evaporative emission standards
- fuel tank capacity (less than 80L or 21.1gal (us))
- temperature of fuel in the fuel tank
(less than 53 °C or 127 °F)
- canister capacity if used (appropriate to the fuel tank)
- liquid gasoline flow to the canister
- fuel draining from carburetor
- length of LPG hose for vaporizer
(300 ± 20mm or 11.8 ± 0.78 inch)
- installation direction of vaporizer
- vacuum lock hose
5. Electric parts
- temp. (unexposed to elevated heat)
- fixing direction
- protection from rain, vibration
- key switch, prevented from rain, washing
- earth (two earth connections necessary for rubber
cushion mount)---Battery Њ Engine / Battery Њ Chassis
- preventive measures against improper wire
connection of ignition harness
- battery capacity
- battery check, cleaning, replacement
- battery cord has a structure not connected conversely
- battery cord not bundled other cords
- contact parts, covered by corrugate tube
- wiring clipping, suitable for vibration
- engine stop at shut down of electric circuit
- cold starting ability, satisfactory for customer
- PTO system, proper
- belt tension drive, durable
- engine serial number, can be read
- engine maintenance interval, clarified
- cover at high temp. Parts / area for burn prevention
- speed control through Kubota speed control lever
and/or governor lever
- emission lavel are visible on the machine note : judgment (evaluation) : O = good, OK, E = to be examined, X = No good, need modification.
judged
* If there are specification or structural changes at Customer's product, application must be rechecked and reported.
confirmed
Customer : Distributor : KUBOTA :
11/jan/01
3
b-
2
Temperature Measuring Sheet for Small SI Engines
Unit model / serial no. : Product Name : checked place at :
Engine model : Engine serial no. : Loading condition : measuring before
* measuring started time : E/G start
* measuring stopped time :
(unit = degrees . )
1st
䋺㩷
䋺
2nd
䋺㩷
䋺
3rd
䋺㩷
䋺
4th
䋺㩷
䋺
5th
䋺㩷
䋺
6th
䋺㩷
䋺
7th
䋺㩷
䋺
8th
䋺㩷
䋺 standard value of evaluation remarks
1. Atmosphere AT
2.
Engine room RT
3. Exhaust gas
(together) EXT
<75/167
4. Engine oil
LOT
䂦 T
5.
Air intake IAT <45/113
6. Cooling air inlet
CAIT
7. Cooling air outlet
䂦 (IAT)-(AT)
<40/104
CAOT
䂦 (CAOT)-(CAIT)
8. Cooling water inlet R
CWIT <110/230 = 0.9 kgf/cm 2
9. Cooling water outlet
R
CWOT
10.
Air To Boil
***ATB=(x)-(CWIT)+(AT) ATB
11. Overflow volume of
cooling water
12. Fuel
OFQ
FOT <60/140
䂦 T <20/68
13. Carburetor chamber surface 䂦 T <20/68
14. Battery surface BRT <55/131 (CCT)-(AT)
15. surface of starter,
alternator, regulator,
STT
ALT <80/176
etc. RET
16. Surface of ignitor, IGcoil SIT
17. Engine rotation
min -1 (rpm) N
<80/176
Low Idling
High Idling note : 1) Operating conditions : Cooling water / LLC 50%, Thermostat / jacked open.
2) The above judgment (evaluation) standards is to be applied in the max. ambient condition of 40°C (104°F), in case
䇭 that the ambient temperature is over 40°C (104°F), it must be judged adding the balance between the actual
䇭 temperature and 40°C (104°F) to the judgment standard.
3) Do not run a cooling test if the ambient temperature is below 24°C (75°F) because the large change in air density
䇭 and radiation from non cooling system parts give false results.
***Air To Boil (ATB) value must be calculated by using below max. temperature :
LLC 50% with 88.3 kPa (0.9 kgf/cm 2 or 12.8 psi) pressure cap : (x) = 110°C (230°F)
special note :
1) The judgment standard > 49°C (120°F) in the above formula { ***ATB = (x) - (CWIT) + (AT) } is KUBOTA's standard.
It may change depending on applications, countries, locations, etc.,
therefor, it is better to judge under the discussion with OEM's referring their own experienced values.
Agreement :
______________________________________________________________________________________________________
______________________________________________________________________________________________________
* If there are specification or structural changes at Customer's product, application must be rechecked and reported.
confirmed
Customer :_____________________ Distributor :_____________________ KUBOTA :_____________________
䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷 reported by :_____________________
11/jan/01
4
b-
3
Vibration Measuring Sheet for Sheet SI Engines
Unit model / serial no. : Product Name : checked place at :
Engine model : Engine serial no.
: Loading condition :
(unit) direction
(rotation) 㸢 vibrating acceleration RMS*** standard value of evaluation
4/4 full load min -1 (rpm)
1. Crank case up / down forward / rear left / right
2. Radiator up / down forward / rear left / right
3. Muffler up / down forward / rear left / right
4. Air cleaner
8(10)
㸡
㸡
2(3)
㸡
㸡
5(10)
㸡
㸡 up / down forward / rear left / right
5. Fuel filter
5(10)
㸡
㸡 up / down forward / rear left / right
5(6)
㸡
㸡
6. Fuel tank up / down forward / rear left / right
7(10)
㸡
㸡
7. Carburetor up / down forward / rear left / right
8.
Vaporizer up / down forward / rear left / right
5
㸡
㸡
5(10)
㸡
㸡
9. Starter up / down forward / rear left / right
10. Dinamo / Alternator up / down forward / rear
5(10)
㸡
㸡 left / right
11. IG coil up / down forward / rear left / right
5(10)
㸡
㸡
12. Electric parts like Regulator, Lamp timer etc. and others up / down forward / rear left / right
5(10)
㸡
㸡
2(3)
㸡
㸡
(G)
0/4
No load min -1 (rpm)
(resonance
point) min -1 (rpm) standard value of evaluation
0.7(1)
㸡
㸡
0.5(1)
㸡
㸡
0.7(1)
㸡
㸡
0.7(1)
㸡
㸡
0.7(1)
㸡
㸡
0.7(1)
㸡
㸡
0.7(1)
㸡
㸡
0.7(1)
㸡
㸡
0.7(1)
㸡
㸡
0.7(1)
㸡
㸡
0.7(1)
㸡
㸡
0.5(1)
㸡
㸡 total amplitude
(mm)
4/4 full load min -1 (rpm)
0/4
No load min -1 (rpm)
(resonance
point) min -1 (rpm) good
OK result
No good to be modified note : 1) "forward / rear" is crankshaft direction and "left / right" is a right angle direction for crankshaft.
2) Figure ( ) in the judgment column shows max. value of resonance point where passed by temporally.
3) RMS*** : root mean square value.
special note : _________________________________________________________________________________________________
_________________________________________________________________________________________________
_________________________________________________________________________________________________
* If there are specification or structural changes at Customer 㵭 s product, application must be rechecked and reported.
confirmed
Customer :_____________________ Distributor :_____________________ KUBOTA :_____________________
reported by :_____________________
11/jan/01
5
Exhaust Emission Check Sheet
for Kubota Small Spark Ignition Engine
Engine Model:
Code No.
Idling Speed:
Application:
High/
-
Base Engine Model:
min -1 (rpm),
Code No.
Low/
min -1 (rpm)
Engine Engineering Dept.
KUBOTA Corporation
Date : Date :
Revision
Date : Date :
Issued
confirmed
Equipment Manufacturer
(Final Assembler)
"Company Name"
Name :
Title :
Signature :
Date :
KUBOTA(Engine)Distributor
"Company Name"
Name :
Title :
Signature :
Date :
November 11, 2010
Issue No.
"Sales Office Name"
Name :
Title :
Signature :
Date :
Rev.No.
KUBOTA Corporation
Engine Engineering Dept.
Name :
Title : General Manager
Signature :
Date :
KUBOTA Corporation
Engine Global Marketing Dept.
Name :
Title : General Manager
Signature :
Date :
1
KUBOTA Industrial Engine Exhaust Emission Review
1. Purpose :
KUBOTA Corporation (KUBOTA) has established this policy for our products with all emission related parts installed (certified configuration) to comply with the applicable emissions regulation of which the equipment manufacturer sell their products to. This Exhaust Emission Check Sheet is to ensure the final certified configuration including emission related parts which to be installed by the equipment manufacturer, for KUBOTA to confirm such configuration to be in compliance with the applicable standards for the final destination of the equipment, and to establish the configuration between the equipment manufacturer and KUBOTA via Kubota
Sales Office.
Additionally, if the engine listed in this check sheet was to be exported to U.S. and Canada in uncertified configuration, it would be exempted from the applicable regulation according to 40 CFR Part 1068.261 provided that such engine will be in the final certified configuration when installed in the equipment based on the contractual agreement. This check sheet serves as Appendix 1 of the contractual agreement package with the purpose for the final assembler to agree to bring the engine into the final certified configuration.
<NOTE>
Make sure to contact KUBOTA via Kubota Sales Office before any parts related to delegated assembly listed in this check sheet are to be changed if the engine is possibly exported to U.S.. Upon mutual agreement of the contents of the change, then perform the change. Failure to do this may be subject to the violation of the paragraph (k) of 40 CFR Part 1068.261.
2. Summary of Exhaust Emission Check Sheet
(1) Emission Performance Check Sheet
• Equipment Information
• The List of Adopted Parts for Intake, Fuel, and Exhaust System
• Emission Performance Result
(2) Fuel System Specification and Intake System Specification Check Sheet
• Details of Installation of Fuel System Specification and Intake System Specification
* As for dedicated OEM specification engine model (the engine with emission related parts not included
in the Installation Instruction Manual), this check sheet also serves as the installation instruction manual.
(3) Exhaust System Specification Check Sheet
• Details of Installation of Exhaust System Specification
* As for dedicated specification engine model (the engine with emission related parts not included in
the Installation Instruction Manual), this check sheet also serves as the installation instruction manual.
November 11, 2010
2
Flow Chart
Action : Sales Office or OEM
Non-intake System Emission Related Parts Selection
• Exhaust manifold: Select from KBT approved parts
• Cat converter/muffler: Select from KBT approved parts
• Spacer: Required or not. (If required, meet the requirements provided in the installation instructions.)
• Gas hose (LPG/NG fueled engine only): Length must be 300 +/- 20mm.
Intake System Emission Related Parts Selection
Action : Sales Office or OEM
Complete section 1, 2, 3, 5 for "Emission Performance Check Sheet (page 4)" and send it to KBT
KBT judges whether
Emission Testing is necessary.
Action : KBT
Unnecessary
Necessary
Action : KBT
KBT reports to the person in charge of the sales office Emission Testing necessary.
Action : Sales Office or OEM
Complete section 1 for "Fuel System Specification and Intake System Specification
Check Sheet (page 5)" and section 1and 3 for "Exhaust System Specification
Check Sheet (page 6)"and send it to KBT.
• KBT reports to the person in charge of the sales office
Emission Testing is to fail.
• Consult about remedy.
Action : Sales Office or OEM
Send KUBOTA related parts
Failed
Emission Testing
@ KBT
Action : KBT
Action : KBT
KBT completes section 4 and 5 for "Emission Performance
Check Sheet (page 4)" and send it to person in charge of the sales office.
Action : KBT,Sales Office or OEM
Passed
Action : KBT
KBT completes section 4 and 5 for "Emission Performance Check
Sheet (page 4)", section 2 for "Fuel System Specification and Intake
System Specification Check Sheet (page 5)" and section 2 and 3 for
"Exhaust System Specification Check Sheet (page 6)"and send it to person in charge of the sales office.
Check the filled items
Action : Sales Office or OEM
Consult about the filled items
Action : KBT,Sales Office and OEM
Not agreed
Agreed Action : KBT
KBT requests approval based on the approval route of cover (page 1) from Engine Global Marketing Dept..
Action : Sales Office, Distr. and OEM
Approved by OEM,KBT Distributor, Sales office
Action : KBT
• Approved by KBT.
• KBT inputs Issue and/or Rev. No..
Action : Sales Office and OEM
Contractual Agreement signed
(Only the model forDelegated Assembly)
* this sheet to be attached
Adopted Action : KBT
November 11, 2010
3
Emission Performance Check Sheet
(Category: Engine Displacement Less than 1 Liter)
1. Final assembler Information
Final assembler's Name :
Equipment Model Name :
2. Subject Regulations and Fuels (Mark "X" or Check the box(es) below)
Regulations :
Fuels :
EPA
Gasoline
CARB 2002/88EC
LPG
CANADA
Natural Gas
3. Engine Information (Fill when adopted)
Engine Model Name : other :
Engine Code :
"Fill in the name of regulation"
3.1 Fuel System and Intake System Specification
For OEM specific engine, attach the drawing or the photo which shows the status of installation on page 5.
Part Name KUBOTA p/n OEM p/n Delegated Assembly* Remarks
Carburetor
Throttle Body
Mixer
Air Cleaner Flange
Inlet Hose 1 select from KBT approved parts select from KBT approved parts select from KBT approved parts select from KBT approved parts
Inlet Hose 2
Inlet Hose 3
Air Cleaner
Hose between Air Cleaner flange and Air Cleaner
Air Cleaner Hose 1
Air Cleaner Hose 2
Air Cleaner Hose 3
Hose to attach Air Cleaner inlet
Gas Hose
Hose to attach between mixer, vaporizer, and regulator
*Length:Must be 300+/-20mm
*Final assembler to mark " ٤ " to the parts to install.
3.2 Exhaust System Specification
For specification engine model, attach the drawing or the photo which shows the status of installation on page 6.
Part Name
Spacer
Catalytic Converter
KUBOTA p/n OEM p/n Delegated Assembly* Remarks comply with installation instruction select from KBT approved parts
Catalytic Muffler select from KBT approved parts
*Final assembler to mark " ٤ " to the parts to install.
4. Emission Performance Result
TO BE COMPLETED BY KUBOTA
Test Location :
Engine Serial No. :
Test Date :
Test Mode :
4.1 Test Result
HC+NO
CO
X
Standard
≤ g/kWh
≤ g/kWh
(Passed: OK, Failed: X, Not Subject: -)
Gasoline LPG Natural Gas
* If there are Intake, Fuel or Exhaust system changes at Customer's Product, Emission of application must be rechecked.
5. Reporter
Reporter (Items 1 ~ 3) :
Reporter (Item 4) :
Date :
Date :
November 11, 2010
4
Fuel System Specification and Intake System Specification Check Sheet
<1. Fuel system picture or drawings and intake system specification installation details.>
<2. Assembly Procedure> To be filled by KUBOTA.
* If there are Intake, Fuel or Exhaust system changes at Customer's Product, Emission of application must be rechecked.
November 11, 2010
5
Exhaust System Specification Check Sheet
<1. Exhaust system specification installation details.>
<2. Assembly Procedure> To be filled by KUBOTA.
* If there are Intake, Fuel or Exhaust system changes at Customer's Product, Emission of application
must be rechecked.
3. Reporter (Fuel system, intake system, exhaust system specification confirmation sheet)
Reporter (Item 1) : Date :
Reporter (Item 2) : Date :
November 11, 2010
6
Kubota
Emissions-Related Installation Instructions
CARB/EPA certified engines, WG752 & WG972
The instructions in this document supersede any other previous instructions provided by Kubota
CONTENTS
1. Important Notice ............................................................................................................................... 1
2. About Objective Items....................................................................................................................... 1
[1] Air Intake System ....................................................................................................................... 2
[2] Exhaust System.......................................................................................................................... 4
[3] High Altitude Operation .............................................................................................................. 8
[4] Evaporative Emission Controls................................................................................................... 9
[5] Engine Set Speed..................................................................................................................... 10
[6] Certification labels .................................................................................................................... 11
[7] Vaporizer Connections ............................................................................................................. 12
3. Production Installation Checklist..................................................................................................... 12
1. Important Notice
EMISSION-RELATED INSTALLATION INSTRUCTIONS
These instructions are provided for the final engine assemblers who must ensure the engine, exhaust system
(catalyst), intake system, gasoline fuel system etc, are Installed correctly in the engine’s certified configuration.
Failing to follow these instructions when installing a certified engine in a piece of non-road equipment violates federal law (40CFR 1068. 105 (b)), subject to fines or other penalties as described in the Clean Air Act.
2. About Objective Items
1.
Intake System
• Kubota offers a standard Air-cleaner kit. The intake parts should be installed according to this instructions.
If you use an OEM intake system for a spec engine, consult Kubota before the application review.
You should consult Kubota whenever you change the intake system.
2. Exhaust System
• Kubota offers certified catalytic mufflers and catalytic converters. You must only use Kubota certified catalyst parts and assemble the exhaust parts according to the instructions. Catalyst parts other than Kubota must not be used because other catalyst is not certified for these engines. You must consult Kubota when you change the exhaust parts after application review.
3. High Altitude Operation
• Kubota prepared genuine altitude compensation kit.
The ultimate users must comply with the regulations through the installation of the appropriate altitude compensation kit.
4. Evaporative Emission Controls
• If your equipments use a volatile liquid fuel (such as gasoline), they must meet the evaporative emission standards of 40 CFR part 1060, as described in §1054.112.
5. Engine Set Speed
• You should operate the engine within the range of engine speed range set at the time of Kubota shipment.
6. Engine Labels
• Kubota puts the certification label on the cylinder head cover. If you install the engine in way that makes the engine’s emission control information label hard to read during normal engine maintenance, you must place a duplicate label on the equipment, as described in 40 CFR 1068.105.
7. Vaporizer Connections
• The hose length between the vaporizer and carburetor must be within 300 ±20 mm (11.8 ±0.78 inch).
1
[1] Air Intake System
• Intake system means that layout of all parts from entrance of suction to air-cleaner flange.
• Kubota offers standard Air-cleaner kit. See SOS option manual about selectable Air-cleaner kit.
• The intake parts should be installed according to these instructions.
• If you use an OEM intake system for a spec engine, consult Kubota based on the Exhaust Emission Check Sheet before the application review.
• When the same specification engine is installed on multiple applications, you will have to inform Kubota prior to the application review.
Also, the final intake system of each application must be confirmed at the application review and/or the Exhaust
Emission Check Sheet.
You must install the intake system confirmed at the application review and/or the Exhaust Emission Check Sheet.
[Check Item]
• You should consult Kubota based on the Exhaust Emission Check Sheet whenever you change the intake system.
Do not change without consultation with Kubota.
2
• External view with standard kit.
Kit parts with “*1” must be installed as shown in the figure below.
• Exception
The figure below shows the range of the layout that you can select freely for the standard kit.
3
[2] Exhaust System
• Exhaust system means the layout of all parts from exhaust manifold to exhaust exit to atmosphere.
• Kubota offers certified catalytic mufflers and catalytic converters.
You must only use Kubota certified catalyst parts [Check Item] and assemble the exhaust parts according to these instructions and/or the Exhaust Emission Check Sheet.
Catalyst parts other than Kubota must not be used because other catalyst is not certified our engine.
You must install the exhaust system confirmed at application review and/or the Exhaust Emission Check Sheet.
[Check Item]
• You must consult Kubota based on the Exhaust Emission Check Sheet when you change the exhaust parts after application review. Do not change without the consultation with Kubota.
4
• Catalyst Identification Marks
The manufacturing number and the catalyst number are marked on surfaces of the catalyst parts.
You must keep record of the catalyst identification information with the engine model and engine serial number that the catalyst is installed. [Check Item] The catalyst parts are shipped with bar-code identification information.
#1 Part number
#2 Manufacturing number
#3 Catalyst number:
5
• You must install the catalyst parts with “*1” directly to the exhaust manifold through the gasket.
See SOS option manual about selectable combinations of the catalyst parts and the exhaust manifold.
• When you use the converter, you must install the converter in the direction where the elbow side of the converter is attached to the exhaust manifold.
• Tighten with the specified torque 23.5~27.5 N · m (17.33~20.28 lb · ft) to avoid exhaust gas leak.
(Exhaust Manifold, Catalyst) [Check Item]
• Handle catalyst parts with care. Damaged or catalyst that has been ‘dropped’ cannot be used.
External view of standard engine
6
• Exceptions
– When it is necessary to offset the installation positions of the catalyst parts to avoid part interference or etc, a spacer can be used between the exhaust manifold and catalyst parts.
[Only for WG972]
Allowable max thickness of the spacer is 20 mm (0.78 inch) .
[Important]
[Only for WG752]
Allowable max thickness of the spacer is 13 mm (0.51 inch) .
[Important]
[Check Item]
• Kubota gasket must be installed on both sides of the spacer.
• The surface-roughness of both Sides of the spacer must be less than 3.2a (3.2 μ m).
And allowance of levelness must be less than 0.2 mm.
• The material of the spacer must be corresponding of SPHC.
• Tighten torque must be within 23.5~27.5 N · m (17.33~20.28 lb · ft)
• When change the stud on the exhaust manifold or use the bolt to tighten, the material of the stud and the bolt must be SAE10B23H.
• Refer to SOS option manual for the installation pitch and etc. of exhaust manifold and catalyst parts.
7
[Other Check Items]
You must confirm that the other parts such as exhaust hoses layout around the catalyst parts confirmed at the time of the application review.
If the layout is not finalized, the catalyst parts might be damaged. Please confirm the following items.
• Installation of the heat cover.
• Installation of the support of exhaust system confirmed at vibration test.
• Installation of the parts installed after Kubota catalyst parts.
• Installation of the other parts (ex. water cover, water cap, etc.).
[3] High Altitude Operation
[Important]
Altitude compensation kit is applied for EPA and CARB certified engines only.
EPA and CARB emission regulations require the ultimate users of non-road SI engine, as their obligation, to adjust the emissions by installing the appropriate genuine altitude compensation kit. And the engine manufacturer must provide such kit when the engine is operated at an altitude that exceeds the standard level, as guaranteed by the engine manufacturer.
For this purpose, Kubota prepared genuine altitude compensation kit described below.
The ultimate users of SI engines must comply with the regulations through the installation of the appropriate altitude compensation kit for the altitude range where the engine will be operated.
*)Prepare for the users who have lost original carburetor’s jet.
Altitude compensation kit part number : Please contact your local Kubota dealer and specify your engine type and engine serial No. Please consult your local Kubota dealer for further information on the altitude compensation kit.
CONSULT YOUR LOCAL KUBOTA DEALER FOR FURTHER INFORMATION ON THIS PROCEDURE.
Refer to Exchange Manual
8
[4] Evaporative Emission Controls
See the evaporative emission standards specified for your equipment in 40 CFR 1054.112 and CARB section
2754. [Check Item]
The standards and other requirements in 40 CFR part 1060 apply to the fuel lines, fuel tanks, fuel caps, canisters and others used or intended to your equipments and our engines.
• Nonmetal fuel lines must meet the permeation requirements specified in 40 CFR 1060.102.
• Fuel tanks must meet the permeation requirements specified in 40 CFR 1060.103 unless they are installed in equipment certified to meet diurnal emission standards under 40 CFR 1060.105(e).
• Your equipment must have a tethered fuel cap. Fuel caps must also include a visual, audible, or other physical indication that they have been properly sealed (EPA 40 CFR 1060.101(f)(1)(i), CARB section 2756).
• Your equipment must have proper carbon canisters that are installed on the fuel tanks subject to running loss or diurnal emission standards (EPA 40 CFR 1060.104(b)(1), CARB section 2754).
KUBOTA recommendation
Equipment manufactures
Objective parts
Fuel Hose, Fuel Tank,
Tank Cap, Canister
* purge port
Regulation requirements
Use certified parts
Remarks
40 CFR 1054.112
CARB section 2754
KUBOTA (engine) Add the purge port
* To route running evaporative emissions into the engine intake system, Kubota prepared the purge port on the air-cleaner flange. You may use this purge port to combust fuel vapors vented from the fuel tank. [Check Item]
9
[Other Check Items]
You must confirm that the fuel parts layout is consistent with what was tested at the application review.
Please confirm the following items.
• Installation of heat cover, fuel hose, etc.
• The temperature of the fuel in the fuel tank must be less than temperature to prevent fuel boiling at all operating conditions.
• If you use a carbon canister, the capacity of fuel tank and the carbon canister is confirmed.
• The liquid gasoline does not enter from the fuel tank to the evaporative canister at all operating conditions.
(at inclination, volume expansion by heat, surface level difference by vibration and etc).
NOTE
• It is equipment manufacturer’s responsibility to make sure the fuel system will comply with the applicable evaporative emissions regulation.
• It is equipment manufacturer’s responsibility to test and confirm the evaporative system will not cause engine performance issues at any operating condition.
[5] Engine Set Speed
[Mechanical Governor specification]
• You should operate the engine within the engine speed range set at the time of Kubota shipment
(without parasitic load).
• You should use the speed control lever and/or the governor lever to change engine speed.
[Electronic Governor specification]
• If you use the electronic governor, consult KUBOTA before the application review.
10
[6] Certification labels
The following labels must be visible. If you install the engine in a way that makes the engine emission control information label hard to read during normal engine maintenance, you must place a duplicate label on the equipment, as described in 40 CFR 1068.105.
• EPA/CARB certification label part numbers
1H965-8891 △ : WG972-G
1H964-8891 △ : WG972-GL
1H963-8891 △ : WG752-G
1H962-8891 △ : WG752-GL
11
[7] Vaporizer Connections
• Vaporizer Connections (WG972-GL· WG752-GL only)
The hose length between the vaporizer and carburetor must be within 300 ±20 mm (11.8 ±0.78 inch).
1
6
7
8
9
10
11
2
3
4
5
3. Production Installation Checklist
NOTE
• The emissions-related installation design (intake & exhaust system, gasoline fuel temperature test, etc.) is verified during the Application Review. The Application Review must be completed before the equipment is released to the market.
• Below is a checklist to be used during the final assembly of each production unit.
Incorporate this checklist into your manufacturing process.
Emissions-Related Installation Check List
Correct intake system confirmed at application review and/or the Exhaust Emission
Check Sheet installed?
Correct catalyst (Kubota parts) is installed?
Catalyst identification information is kept with the engine information?
Correct exhaust system installed?
Torque of catalyst parts installation is correct?
Correct spacer and related parts are installed? (If necessary)
Is the other parts layout around the catalyst parts correct?
Correct fuel system (fuel tank~purge port) confirmed at application review installed?
Range of engine operation speed is correct?
EPA and CARB emissions labels are visible?
The hose length between vaporizer and carburetor is correct?
Page
2-3
8
8
9-10
10
11
12
4
5
6
7
Yes No
12
Kubota
Emissions-Related Installation Instructions
EPA certified engines, DG972
The instructions in this document supersede any other previous instructions provided by Kubota
CONTENTS
1. Important Notice ............................................................................................................................... 1
2. About Objective Items....................................................................................................................... 1
[1] Air Intake System ....................................................................................................................... 1
[2] Engine Set Speed....................................................................................................................... 3
[3] Certification labels ...................................................................................................................... 4
[4] Regulator Connections ............................................................................................................... 5
3. Production Installation Checklist....................................................................................................... 5
1. Important Notice
EMISSION-RELATED INSTALLATION INSTRUCTIONS
These instructions are provided for the final engine assemblers who must ensure the engine, intake system, natural gas fuel system and etc, are Installed correctly in the engine’s certified configuration.
Failing to follow these instructions when installing a certified engine in a piece of non-road equipment violates federal law (40CFR 1068. 105 (b)), subject to fines or other penalties as described in the Clean Air Act.
2. About Objective Items
1.
Intake System
• Kubota offers a standard Air-cleaner kit. The intake parts should be installed according to this instructions.
If you use an OEM intake system for a spec engine, consult Kubota before application review.
You should consult Kubota whenever you change the intake system.
2. Engine Set Speed
• You should operate the engine within the range of engine speed set at the time of Kubota shipment.
3. Engine Labels
• Kubota puts the certification label on the cylinder head cover. If you install the engine in way that makes the engine’s emission control information label hard to read during normal engine maintenance, you must place a duplicate label on the equipment, as described in 40 CFR 1068.105.
4. Regulator Connections
• The hose length between the regulator and gas mixer must be within 300 ±20 mm (11.8 ±0.78 inch).
[1] Air Intake System
• Intake system means that layout of all parts from entrance of suction to air-cleaner flange.
• Kubota offers standard Air-cleaner kit. See SOS option manual about selectable Air-cleaner kit.
• The intake parts should be installed according to these instructions.
• If you use an OEM intake system for a spec engine, consult Kubota based on the Exhaust Emission Check Sheet before the application review.
• When the same specification engine is installed multiple applications, you will have to inform Kubota prior to the application review.
Also, the final intake system of each application must be confirmed at the application review and/or the Exhaust
Emission Check Sheet.
You must install the intake system confirmed at the application review and/or the Exhaust Emission Check Sheet.
[Check Item]
• You should consult Kubota based on the Exhaust Emission Check Sheet whenever you change the intake system.
Do not change without consultation with Kubota.
1
• External view with standard kit.
Kit parts with “*1” must be installed as shown in the figure below.
• Exception
The figure below shows the range of the layout that you can select freely for the standard kit.
2
[2] Engine Set Speed
[Mechanical Governor specification]
• You should operate the engine within the engine speed range set at the time of the Kubota shipment
(without parasitic load).
• You should use the speed control lever and/or the governor lever to change engine speed.
[Electronic Governor specification]
• If you use the electronic governor, consult KUBOTA before the application review.
3
[3] Certification labels
The following labels must be visible. If you install the engine in way that makes the engine emission control information label hard to read during normal engine maintenance, you must place a duplicate label on the equipment, as described in 40 CFR 1068.105.
• EPA certification label part numbers
1H959-8891 △ : DG972
4
[4] Regulator Connections
• Regulator Connections
The hose length between the regulator and gas mixer must be within 300 ±20 mm (11.8 ±0.78 inch).
3. Production Installation Checklist
1
2
3
4
NOTE
• The emissions-related installation design (intake system, natural gas fuel system, and etc.) is verified during the Application Review. The Application Review must be completed before the equipment is released to the market.
• Below is a checklist to be used during the final assembly of each production unit.
Incorporate this checklist into your manufacturing process.
Page Yes No Emissions-Related Installation Check List
Correct intake system confirmed at application review and/or the Exhaust Emission
Check Sheet installed?
Range of engine operation speed is correct?
EPA emission label is visible?
The hose length between the regulator and gas mixer is correct?
1-2
3
4
5
5

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Key features
- Water-cooled 4-cycle Natural Gas engine
- High idle speed of 3850 min-1 (rpm)
- Low idle speed of 1500 min-1 (rpm)
- Maximum torque of 68.6 N·m (50.6 ft-lb) at 2400 min-1 (rpm)
- Centrifugal ball mechanical type governor
- Dry weight of approximately 72.0 kg (159 lb)