Kubota WG972-G-E3 Operator's Manual

Kubota liquid cooled gasoline/lpg engine

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PRINTED IN JAPAN

Code No. EG801-8916-9

OPERATOR'S MANUAL

KUBOTA LIQUID COOLED GASOLINE

MANUEL DE L'OPERATEUR

MOTEUR À ESSENCE

LPG REFROIDI PAR LIQUIDE DE KUBOTA

BEDIENUNGSANLEITUNG

FLÜSSIGKEITSGEKÜHLTER BENZIN-

MANUALE DELL'OPERATORE

MOTORE KUBOTA A BENZINA

LPG CON RAFFREDDAMENTO A LIQUIDO

MANUAL DE INSTRUCCIONES

MOTOR KUBOTA DE GASOLINA

WG972-G-E3 · GL-E3

1BGAAAJAP0010

READ AND SAVE THIS BOOK

MANUEL A LIRE ET A CONSERVER

DIESE ANLEITUNG BITTE SORGFÄLTIG DURCHLESEN

UND GRIFFBEREIT AUFBEWAHREN

LEGGETE E CONSERVATE QUESTO MANUALE

LEAN Y CONSERVEN ESTE MANUAL

LPG ENGINE

LPG-MOTOR VON KUBOTA

LPG REFRIGERADO POR LÍQUIDO

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Summary of Contents for Kubota WG972-G-E3

Page 1 OPERATOR'S MANUAL KUBOTA LIQUID COOLED GASOLINE LPG ENGINE MANUEL DE L'OPERATEUR MOTEUR À ESSENCE LPG REFROIDI PAR LIQUIDE DE KUBOTA BEDIENUNGSANLEITUNG FLÜSSIGKEITSGEKÜHLTER BENZIN- LPG-MOTOR VON KUBOTA MANUALE DELL'OPERATORE MOTORE KUBOTA A BENZINA LPG CON RAFFREDDAMENTO A LIQUIDO MANUAL DE INSTRUCCIONES MOTOR KUBOTA DE GASOLINA LPG REFRIGERADO POR LÍQUIDO...
Page 2 THE WG972-G-E3/GL-E3 ENGINE CONFORMS TO EU EMISSION REGULATION FOR SI SOREs. California Proposition 65 WARNING Engine exhaust, some of its constituents, certain vehicle components and fluids, contain or emit chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
Page 3 OPERATOR S MANUAL KUBOTA LIQUID COOLED GASOLINE LPG ENGINE MODELS WG972-G-E3 · GL-E3 1BGAAAJAP0010 EG801-8916-9 READ AND SAVE THIS BOOK...
Page 4 FOREWORD You are now the proud owner of a KUBOTA Engine. This engine is a product of KUBOTA quality engineering and manufacturing. It is made of fine materials and under a rigid quality control system. It will give you long, satisfactory service. To obtain the best use of your engine, please read this manual carefully.
Page 5: Table Of Contents
Radiator cooling water (Coolant) ..................9 Oil pressure lamp ......................9 Immediately stop the engine if;..................9 TAMPER RESISTANCE...................9 Carburetor [WG972-G-E3], Dual fuel carburetor [WG972-GL-E3] ........9 Sensor (crank angle) ......................9 LPG regulator [WG972-GL-E3] ..................10 MAINTENANCE ......................11 SERVICE INTERVALS ...................12 PERIODIC SERVICE ....................16...
Page 6 CONTENTS Dust indicator (optional) ....................23 FUEL SYSTEM AND DIAGRAMS ................24 LPG fuel system ......................24 Tightening torques and leak check for LPG regulator with vaporizer ......24 Fuel system diagrams ....................25 ELECTRIC WIRING ....................26 FAN BELT ......................26 Adjusting fan belt tension ....................26 CARRIAGE AND STORAGE ..................27 CARRIAGE ......................27 STORAGE ......................27...
Page 7 UNAUTHORIZED MODIFICATIONS to the engine may impair the function and/or safety and affect engine life. If the engine does not perform properly, consult your local Kubota Engine Distributor first. 2. WEAR SAFE CLOTHING AND PERSONAL PROTECTIVE EQUIPMENT (PPE) A DO NOT wear loose, torn or bulky clothing around the...
Page 8 SAFE OPERATION 3. CHECK BEFORE STARTING & OPERATING THE ENGINE A Be sure to inspect the engine before operation. Do not operate the engine if there is something wrong with it. Repair it immediately. A Ensure all guards and shields are in place before operating the engine.
Page 9 SAFE OPERATION A If running the engine on LPG, use the standard LPG fuel recommended by KUBOTA. The use of other fuel may cause a hazardous or dangerous condition. A LPG fuel in the gaseous state is heavier than air and will settle in low areas, this may be hazardous.
Page 10 SAFE OPERATION 8. CAUTIONS AGAINST BURNS & BATTERY EXPLOSION A To avoid burns, be cautious of hot components, e.g. muffler, muffler cover, radiator, hoses, engine body, coolants, engine oil, etc. during operation and after the engine has been shut off. A DO NOT remove the radiator cap while the engine is running or immediately after stopping.
Page 11 A DO NOT mix different types of Anti-freeze. The mixture can produce a chemical reaction causing harmful substances. Use approved or genuine KUBOTA Anti-freeze. A Be mindful of the environment and the ecology. Before draining any fluids, determine the correct way to dispose of them.
Page 12 2. Clean warning and caution labels with soap and water, dry with a soft cloth. 3. Replace damaged or missing warning and caution labels with new labels from your local KUBOTA dealer. 4. If a component with warning and caution label(s) affixed is replaced with a new part, make sure the new label(s) is (are) attached in the same location(s) as the replaced component.
Page 13: Safe Operation
However, when in need of parts or major service, be sure to see your KUBOTA dealer. For service, contact the KUBOTA Dealership from which you purchased your engine or your local KUBOTA dealer. When in need of parts, be prepared to give your dealer the engine serial number.
Page 14: Important Information Of Emission Regulation
CONSULT YOUR LOCAL KUBOTA DEALER FOR FURTHER INFORMATION ON THIS PROCEDURE. 6. PURGE PORT Kubota prepared the purge port on the air-cleaner flange. You should use this purge port to combust fuel vapors vented from the fuel tank. CONSULT YOUR LOCAL KUBOTA DEALER FOR FURTHER INFORMATION.
Page 15: Names Of Parts
NAMES OF PARTS NAMES OF PARTS Type Type Ref. Ref. Part Name Part Name Speed control lever (11) Coolant drain shutoff-valve Spark plug (12) Oil level gauge Oil filler plug (13) Intake manifold Plug cap (14) Alternator Engine hook (15) Exhaust manifold Cooling fan (16)
Page 16: Pre-Operation Check
PRE-OPERATION CHECK PRE-OPERATION CHECK BREAK-IN During the engine break-in period, observe the following by all means: 1. Change engine oil and oil filter cartridge after the first 50 hours of operation. (See "ENGINE OIL" in "PERIODIC SERVICE" section.) 2. When ambient temperature is low, operate the machine after the engine has been completely warmed up. DAILY CHECK To prevent trouble from occurring, it is important to know the conditions of the engine well.
Page 17: Operating The Engine
OPERATING THE ENGINE OPERATING THE ENGINE STARTING THE ENGINE (NORMAL) To avoid personal injury or death: A Do not allow children to approach the machine while the engine is running. A Be sure to install the machine on which the engine is installed, on a flat place. A Do not run the engine on gradients.
Page 18 "GASOLINE" position. "LPG" position. NOTE: NOTE: *Not KUBOTA supplied. (the fuel selector switch) *Not KUBOTA supplied. (the fuel selector switch) See "WIRING DIAGRAMS" section about the wiring. See "WIRING DIAGRAMS" section about the wiring. 3. Set the speed control lever to "low idling".
Page 19 OPERATING THE ENGINE 5. Insert the key into the starter switch and turn it to the "ON" ( ) position. (A) “OFF“ (B) “ON” (C) “START” 6. Check to see that the oil pressure lamp and charge lamp are ON. 7.
Page 20: Stopping The Engine
OPERATING THE ENGINE STOPPING THE ENGINE Gasoline 1. Disengage the engine drive power and 1. Disengage the engine drive power and set the speed control lever to "low set the speed control lever to "low idling". idling". (1) Speed control lever (A) "LOW IDLING"...
Page 21: Checks During Operation
If service or repair is needed, contact your local parts are working correctly. KUBOTA dealer. BRadiator cooling water (Coolant) BCarburetor [WG972-G-E3], Dual fuel carburetor [WG972-GL-E3] The carburetor is tamper resistant; the idle mixture screw To avoid personal injury or death: has been covered by tamper plug after adjustment at the factory.
Page 22: Lpg Regulator [Wg972-Gl-E3]
You CANNOT adjust the above 2 screws. (1) LPG regulator (A) For main pressure resistance (B) For idle pressure resistance Do not deliberately tamper, or misuse, the engine emission control system. If service or repair is needed, contact your local KUBOTA dealer.
Page 23: Maintenance
MAINTENANCE MAINTENANCE To avoid personal injury or death: A Be sure to conduct daily checks, periodic maintenance, refueling or cleaning on a level surface with the engine shut off and remove the key. A Before allowing other people to use your engine, explain how to operate, and have them read this manual before operation.
Page 24: Service Intervals
*1 Change more often when operating under dusty conditions. *2 If you do not have the proper tools and/or are not mechanically proficient, contact your local KUBOTA dealer. To ensure the best quality and reliability, use new KUBOTA Genuine parts or their equivalents for repair and replacement,...
Page 25 *1 Change more often when operating under dusty conditions. *2 If you do not have the proper tools and/or are not mechanically proficient, contact your local KUBOTA dealer. To ensure the best quality and reliability, use new KUBOTA Genuine parts or their equivalents for repair and replacement,...
Page 26 *1 Change more often when operating under dusty conditions. *2 If you do not have the proper tools and/or are not mechanically proficient, contact your local KUBOTA dealer. To ensure the best quality and reliability, use new KUBOTA Genuine parts or their equivalents for repair and replacement,...
Page 27 *1 Change more often when operating under dusty conditions. *2 If you do not have the proper tools and/or are not mechanically proficient, contact your local KUBOTA dealer. To ensure the best quality and reliability, use new KUBOTA Genuine parts or their equivalents for repair and replacement,...
Page 28: Periodic Service
PERIODIC SERVICE PERIODIC SERVICE FUEL BLPG Fuel is flammable and can be dangerous. You should [WG972-GL-E3] handle fuel with care. 1. Use Commercial LPG only. 2. Fuel tank is liquid withdrawal type. BGasoline 1. Use unleaded gasoline and E10 only. A DO NOT use gasoline blended with methyl alcohol.
Page 29: Lpg Regulator Check
PERIODIC SERVICE BLPG regulator check BChecking oil level and adding engine oil [WG972-GL-E3] 1. Check the engine oil level before starting or more than 5 minutes after stopping the engine. Check that the hot water lines are not leaking. 2. Remove the oil level gauge, wipe it clean and reinstall it. Check that the vacuum lock pipe is not damaged.
Page 30: Changing Engine Oil
PERIODIC SERVICE BChanging engine oil BReplacing the oil filter cartridge To avoid personal injury or death: To avoid personal injury or death: A Be sure to stop the engine before A Be sure to stop the engine before draining engine oil. changing the oil filter cartridge.
Page 31: Spark Plug
PERIODIC SERVICE SPARK PLUG RADIATOR Coolant will last for one day's work if filled all the way up BCleaning and adjustment clearance before operation start. Make it a rule to check the coolant If the spark plug electrode or its insulator is soiled or is level before every operation.
Page 32: Changing Coolant
When it is caution and securely retighten the cap. between the "FULL" and "LOW" marks, the coolant A If coolant should be leak, consult your local KUBOTA will last for one day's work. dealer.
Page 33: Checking Radiator Hoses And Clamp Bands
Always use a 50/50 mix of long-life coolant and clean soft 5. Check to see if radiator water pipe is clogged. water in KUBOTA engines. Contact KUBOTA concerning coolant for extreme BCleaning radiator core (outside) conditions. If dust is between the fin and tube, wash it away with 1.
Page 34: Air Cleaner
If mixed with the cleaning agent, sludge may build up, adversely affecting the engine parts. 7. Kubota's genuine long-life coolant has a service life of 2 years. Be sure to change the coolant every 2 years. A The above data represents industry standards that...
Page 35: Evacuator Valve
PERIODIC SERVICE BEvacuator valve BDust indicator (optional) Open the evacuator valve once a week under ordinary If the red signal on the dust indicator attached to the air conditions - or daily when used in a dusty place - to get rid cleaner is visible, the air cleaner has reached the service of large particles of dust and dirt.
Page 36: Fuel System And Diagrams
A These non-KUBOTA installed parts, such as hoses, fittings, piping and shut off solenoid valve should be approved for LPG use and conform to UL, CSA, NFPA, MSHA and all other applicable standards. A An approved, listed fuel filter and shut off solenoid valve must be installed between the LPG tank and KUBOTA LPG regulator with vaporizer.
Page 37: Fuel System Diagrams
PERIODIC SERVICE BFuel system diagrams C Setting of LPG regulator and vibration limits Install the LPG regulator in UPRIGHT position as shown in below (a) marking figure. It must be installed within 4G vibration level. If not, it may not supply necessary LPG fuel to the engine. (See "LPG"...
Page 38: Electric Wiring
PERIODIC SERVICE ELECTRIC WIRING FAN BELT BAdjusting fan belt tension To avoid personal injury or death: C Shorting of electric cable or wiring To avoid personal injury or death: may cause a fire. A Be sure to stop the engine and A Check to see if electric cables and remove the key before checking the wiring are swollen, hardened or...
Page 39: Carriage And Storage
CARRIAGE AND STORAGE CARRIAGE AND STORAGE CARRIAGE To avoid personal injury or death: A Fix the engine securely not to fall during operation. A Do not stand near or under the engine while carrying it. A The engine is heavy. In handling it, be very alert not to get your hands and body caught in.
Page 40: Troubleshooting
TROUBLESHOOTING TROUBLESHOOTING The engine malfunctions can result from a large number of causes. The following describes symptoms that are encountered relatively more often than others, their major causes and remedies. B When it is difficult to start the engine Cause Countermeasures Check the fuel tank, fuel filter, fuel hoses and fuel pump.
Page 41 TROUBLESHOOTING B When engine speed is insufficient Cause Countermeasures Improper or defective spark plug * Clean or replace. Defective ignition coil * Replace. Defective throttle body * Replace. Breather tube has separated. * Attach correctly. Disconnection * Check the wire harness. B When engine suddenly stops Cause Countermeasures...
Page 42 * Check temperature with thermometer and replace if Defective temperature sensor necessary. Overload running * Reduce load. Head gasket defective or water * Replace parts. leakage A If the cause of trouble can not be found, consult your KUBOTA dealer.
Page 43: Specifications
SPECIFICATIONS SPECIFICATIONS WG972-G-E3 WG972-GL-E3 Item Unit Gasoline Gasoline Type Vertical, Water-cooled 4 cycle No. of cyl. - bore x stroke mm (in.) 3- 74.5 x L73.6 (3- 2.93 x L2.90) Total displacement L (cu-in.) 0.962 (58.7) SAE Gross int. 24.2 (32.5) / 3600 23.1 (31.0) / 3600...
Page 44 SPECIFICATIONS...
Page 45: Wiring Diagrams
WIRING DIAGRAMS WIRING DIAGRAMS Ignition Coil Assy EG561-6890etc Sensor Green Blue E9121-6833 Black Black All Speed Mode Black/Red Igniter Black/White Assy Black/Blue Orange EG561-6810 Orange Potention meter Orange 1~10kΩ 16678-6401 RELAY Alternator DRIVER 12P Coupler Aux2 Aux1+ Aux4 MPU + MPU + engine POWER INPUT...

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