Kubota WG752 E3 Applications Manual
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Kubota WG752 E3 Applications Manual

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KUBOTA ENGINES
APPLICATION MANUAL
(WG752, WG972 E3 MODEL)
(DG972 E2 MODEL)
First Edition
January, 2011
KUBOTA

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Summary of Contents for Kubota WG752 E3

  • Page 1 KUBOTA ENGINES APPLICATION MANUAL (WG752, WG972 E3 MODEL) (DG972 E2 MODEL) First Edition January, 2011 KUBOTA...

  • Page 2: Table Of Contents

    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...

  • Page 3: Specifications

    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.

  • Page 4: General Information

    GENERAL INFORMATION...
  • Page 5 0. GENERAL CONTENTS 1. SPECIFICATIONS......................... 0-1 2. PERFORMANCE CURVES......................0-4 3. DIMENSIONS ..........................0-6...
  • Page 6 1. SPECIFICATIONS Model WG752-G-E3 WG752-GL-E3 Item Vertical, water cooled 4-cycle Dual Fuel Vertical, water cooled (Gasoline/LPG) Type 4-cycle Gasoline engine Gasoline fuel LPG fuel Number of cylinders Cylinder bore x Stroke mm (in) 68.0 (2.68) x 68.0 (2.68) Total displacement L (cu.
  • Page 7 SAEH : 525.5 x 416.4 x 502.5 (20.69 x 16.39 x 19.78) Dry weight kg (lb) Approx. 72.0 (159) NOTE • *1 Consult Kubota for further information. • *2 LPG regulator with vaporizer operates on a liquid withdrawal type system.

  • Page 8: Emission Regulation

    Dry weight kg (lb) 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.

  • Page 9: Performance Curves

    2. PERFORMANCE CURVES...

  • Page 11: Dimensions

    3. DIMENSIONS WG752-G-E3BBH-1 (EG641-00000)
  • Page 12 WG752-GL-E3BBH-1 (EG645-00000)
  • Page 13 WG972-G-E3BBH-1 (EG801-00000)
  • Page 14 WG972-GL-E3BBH-1(EG805-00000)
  • Page 15 WG972-GL-E3SAEH-1 (EG802-00000) 0-10...
  • Page 16 DG972-E2-BBH-1 (EG581-00000) 0-11...
  • Page 17 DG972-E2-SAEH-1 (EG582-00000) 0-12...
  • Page 18 WG752, WG972, DG972 Flywheel : Normal SAE for Clutch No.6-1/2 Flywheel Housing : Normal SAE No.5 0-13...
  • Page 19 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..................
  • Page 20 1. GENERAL Along with E3 models, E2 models are yet available to be used in the following countries per output category. kW, disp. Model Type North America Europe Japan WG752-G/GL-E3 Available Non-available Available P ≤ 19 WG/DF752-E2 Non-available Available Available 0.225 ≤...

  • Page 21: Fuel System

    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.

  • Page 22: Emission-Related Installation Instructions

    • 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.
  • Page 23 DG972-E2-BBH DG972-E2-SAEH, WG-972-GL-E3SAEH...

  • Page 24: Exhaust System

    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.

  • Page 25: Engine Labels

    (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.
  • Page 26 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.
  • Page 27 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;...
  • Page 28 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..

  • Page 29: General

    • This manual describes the performance with Japanese standard natural gas. The lower heating value : 9699 kcal/m (1090BTU/ft • Supply pressure of natural gas : between 0.98 and 3.45 kPa. • Consult KUBOTA for further information of fuel used.

  • Page 30: Fuel Diagram

    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.
  • Page 31 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.

  • Page 32: Cautions

    • 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.

  • Page 33: For Emission Regulations (Wg752−Gl, Wg972−Gl, Dg972)

    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.

  • Page 34: High Altitude Operation (Wg752, Wg972)

    * 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.

  • Page 35: Evaporative Emission Control (Gasoline Fuel)

    * purge port 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.
  • Page 36 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...

  • Page 37: 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.

  • Page 38: Exceptions (Wg752, Wg972)

    • 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).

  • Page 39: Related Check Items

    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.

  • Page 40: For Mass Production (Wg752, Wg972)

    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.

  • Page 41: Electrical System

    4. ELECTRICAL SYSTEM CONTENTS 1. WIRING DIAGRAM........................4-1 2. CAUTION (WG752, WG972)......................4-3...
  • Page 42 1. WIRING DIAGRAM WG752...
  • Page 43 WG972, DG972...
  • Page 44 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. •...

  • Page 45: Technical Information

    TECHNICAL INFORMATION...
  • Page 46 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) .........

  • Page 47: Brake Horse Power

    1. BRAKE HORSE POWER SAE J1349 Engine Speed (min (rpm)) Model Fuel Output 2000 2400 2800 3200 3600 11.3 13.8 15.6 16.7 17.1 Net intermittent 15.1 18.5 20.9 22.4 22.9 15.4 18.8 21.2 22.7 23.2 Gasoline 10.8 12.2 13.1 13.4 Net continuous 11.8 14.5...

  • Page 48: Fuel Consumption

    2. FUEL CONSUMPTION Specific at net intermittent (SAE J1349) Engine Speed (min (rpm)) Model Fuel Output 2000 2400 2800 3200 3600 11.3 13.8 15.6 16.7 17.1 Brake horse power 15.1 18.5 20.9 22.4 22.9 15.4 18.8 21.2 22.7 23.2 Gasoline g/kWh g/HPh Fuel consumption...

  • Page 49: Sound Pressure Level

    3. SOUND PRESSURE LEVEL unit dB(A) (rpm) Load ratio Fuel Sound pressure at 1 m (3.3 ft) Gasoline 3850 Gasoline WG752 3600 Gasoline 1500 unit dB(A) (rpm) Load ratio Fuel Sound pressure at 1 m (3.3 ft) Gasoline 3850 3600 Gasoline WG972 DG972...

  • Page 50: Air Requirements

    4. AIR REQUIREMENTS [1] Combustion air requirements (At 25 deg.C and 1000 hPa) Engine Speed (min (rpm)) Model Fuel Output 2000 2400 2800 3200 3600 L/sec 10.48 12.58 14.68 16.77 18.87 37.74 45.29 52.84 60.38 67.93 Combustion air Gasoline requirements /sec 1024 1152...

  • Page 51: Cooling Air Requirements (At 25 Deg.c And 1000 Hpa)

    [2] Cooling air requirements (At 25 deg.C and 1000 hPa) Engine Speed (min (rpm)) Model Fuel Output 2000 2400 2800 3200 3600 L/sec 359.4 418.8 476.5 550.6 651.3 1294 1508 1715 1982 2345 Gasoline Cooling air requirements /sec 21933 25554 29078 33598 39742...

  • Page 52: Combustion And Cooling Air Requirements (At 25 Deg.c And 1000 Hpa)

    [3] Combustion and cooling air requirements (At 25 deg.C and 1000 hPa) Engine Speed (min (rpm)) Model Fuel Output 2000 2400 2800 3200 3600 L/sec 369.9 431.3 491.2 567.4 670.1 1331.6 1552.8 1768.3 2042.5 2412.5 Combustion and Gasoline cooling air requirements /sec 22572 26322...

  • Page 53: Exhaust Gas Volume

    5. EXHAUST GAS VOLUME At 25 deg.C and 1000 hPa Engine Speed (min (rpm)) Model Fuel Output 1500 2000 2400 2800 3200 3600 L/sec 22.58 30.11 36.14 42.16 48.18 54.20 81.3 108.4 130.09 151.77 173.45 195.13 Gasoline Gas volume /sec 1378 1837 2205...

  • Page 54: Heat Rejection To Coolant

    6. HEAT REJECTION TO COOLANT Specific at net intermittent (SAE J1349) Engine Speed (min (rpm)) Model Fuel Output 2000 2400 2800 3200 3600 11.3 13.8 15.6 16.7 17.1 Brake horse power 15.1 18.5 22.4 15.3 18.8 21.3 22.7 23.3 g/kWh g/HPh Gasoline Fuel consumption...
  • Page 55 Engine Speed (min (rpm)) Model Fuel Output 2000 2400 2800 3200 3600 14.8 17.8 20.6 22.2 23.1 Brake horse power 19.8 23.9 27.6 29.8 31.0 20.1 24.2 28.0 30.2 31.4 g/kWh g/HPh Gasoline Fuel consumption g/PSh lb/HPh 0.664 0.654 0.609 0.577 0.549 MJ/h...

  • Page 56: Water Flow Rate

    7. WATER FLOW RATE [1] WATER FLOW RATE OF WG752 Water Pump 1E051-7303∆ Fan Pulley Dia. 84 mm (3.31 in.) Fan Drive Pulley Dia. 100 mm (3.94 in.) Thermostat 19203-7301∆ NOTE • The flow is with std. radiator. • Including engine block, radiator and piping resistance. 1-10...

  • Page 57: Water Flow Rate Of Wg972, Dg972

    [2] WATER FLOW RATE OF WG972, DG972 Water Pump 1E051-7303∆ Fan Pulley Dia. 84 mm (3.31 in.) Fan Drive Pulley Dia. 100 mm (3.94 in.) Thermostat 19434-7301∆ NOTE • The flow is with std. radiator. • Including engine block, radiator and piping resistance. 1-11...

  • Page 58: Center Of Gravity

    8. CENTER OF GRAVITY 1. With standard flywheel and rear-end plate Center of gravity Dry weight Model kg (lb) X mm (in) Y mm (in) Z mm (in) WG752 61.7 (136) 2 (0.08) 64 (2.52) 171 (6.73) WG/DG972 72 (159) −25.5 (−1.00) 73.3 (2.89) 179.5 (7.07)

  • Page 59: Mass Elastic System

    9. MASS ELASTIC SYSTEM [1] EQUIVALENT TORSIONAL VIBRATION DATA EQUIVALENT LENGTH (cm) POLAR MOMENT OF INERTIA (kgfcm-sec MODEL WG752 30670 5136 5136 3673 0.013 0.017 0.011 0.018 0.392 NOTE • Flywheel 16861-25110, V-Pulley 16861-74280 EQUIVALENT LENGTH (cm) POLAR MOMENT OF INERTIA (kgfcm-sec MODEL WG/DG972 35082...

  • Page 60: Unbalanced Forces

    10. UNBALANCED FORCES [1] BASE DATA Model I (m) r (m) L (m) Wp (kgf) Bore (mm) Stroke (mm) WG752 0.0980 0.0340 0.0720 0.4320 68.0 68.0 WG/DG972 0.0980 0.0368 0.0800 0.3685 74.5 73.6 [2] UNBALANCED INERTIA FORCE AND COUPLE (xω Cylinder Bore Model No.

  • Page 61: An Example Of Calculation

    [3] AN EXAMPLE OF CALCULATION Fz, Npy, Noz Calculation condition ω Order Caluculation Fz (kgf) 0.000093 × 142122 =13.2 kg Engine model : WG752 (2 x π × 3600/60) = 142122 Engine speed : 3600 min (rpm) (kgf-m) 0.000065 × 142122 =9.2 kg 0.000093 ×...

  • Page 62: Application Check Sheet

    Application Check Sheet Kubota Small SI Engine Engine Model: Basic Engine Model: Code No. Code No. Overload: Overload: ISO-2534,3046 ISO-2534,3046 (rpm) (rpm) Continues: Continues: (rpm) ISO-2534,3046 (rpm) ISO-2534,3046 Idling Speed: High/ Low/ (rpm), (rpm) Application: Engine Engineering Dept. KUBOTA Corporation...
  • Page 63 KUBOTA Industrial Engine Application Review 1) Purpose : One of the policies of KUBOTA Corporation Engine Division (hereinafter referred as KUBOTA ) is to assist equipment manufacturers in the application of KUBOTA engines with the objective of improving the overall equipment quality.

  • Page 64: Exhaust Emission Check Sheet

    - air bleeding, after fitter change or fuel empty - safety label - electric fuel feed pump for low positioned tank - speed control through Kubota speed control lever - fuel supply to fuel tank and/or governor lever - fuel draining from tank bottom...
  • Page 65 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.
  • Page 66 3) RMS*** : root mean square value. special note : _________________________________________________________________________________________________ _________________________________________________________________________________________________ _________________________________________________________________________________________________ * If there are specification or structural changes at Customer s product, application must be rechecked and reported. confirmed Customer :_____________________ Distributor :_____________________ KUBOTA :_____________________ reported by :_____________________ 11/jan/01...
  • Page 67 Exhaust Emission Check Sheet Kubota Small Spark Ignition Engine Engine Model: Base Engine Model: Code No. Code No. Idling Speed: High/ Low/ (rpm), (rpm) Application: Engine Engineering Dept. KUBOTA Corporation Revision Issued Date : Date : Date : Date : Issue No.
  • Page 68 <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.
  • Page 69 Check Sheet (page 5)" and section 1and 3 for "Exhaust System Specification Check Sheet (page 6)"and send it to KBT. Action : Sales Office or OEM Action : KBT Send KUBOTA related parts KBT completes section 4 and 5 for "Emission Performance • KBT reports to the person in...
  • Page 70 Catalytic Muffler select from KBT approved parts *Final assembler to mark " " to the parts to install. 4. Emission Performance Result TO BE COMPLETED BY KUBOTA Test Location : Test Date : Engine Serial No. : Test Mode : (Passed: OK, Failed: X, Not Subject: -) 4.1 Test Result...
  • Page 71 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.
  • Page 72 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)

  • Page 73: Emissions-Related Installation

    Kubota Emissions-Related Installation Instructions CARB/EPA certified engines, WG752 & WG972 The instructions in this document supersede any other previous instructions provided by Kubota...
  • Page 74 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 ......................

  • Page 75: Important Notice

    • 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.

  • Page 76: Air Intake System

    • 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.
  • Page 77 • 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.

  • Page 78: Exhaust System

    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.
  • Page 79 • 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:...
  • Page 80 • 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.
  • Page 81 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 μm).

  • Page 82: High Altitude Operation

    *)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.

  • Page 83: Evaporative Emission Controls

    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]...

  • Page 84: Engine Set Speed

    [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.

  • Page 85: Certification Labels

    [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.

  • Page 86: Vaporizer Connections

    Page 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?
  • Page 87 Kubota Emissions-Related Installation Instructions EPA certified engines, DG972 The instructions in this document supersede any other previous instructions provided by Kubota...
  • Page 88 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...

  • Page 89: Important Notice

    • 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.
  • Page 90 • 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.

  • Page 91: Engine Set Speed

    [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.

  • Page 92: Certification Labels

    [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.

  • Page 93: Regulator Connections

    [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 NOTE • The emissions-related installation design (intake system, natural gas fuel system, and etc.) is verified during the Application Review.

This manual is also suitable for:

Wg972 e3Dg972 e2

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