Kubota WG972-E2 Gebrauchsanweisung

WORKSHOP MANUAL

GASOLINE,LPG ENGINE

WG972-E2,DF972-E2

KiSC issued 01, 2006 A

TO THE READER

This Workshop Manual has been prepared to provide servicing personnel with

information on the mechanism, service and maintenance of KUBOTA Gasoline / LPG

Fuel Engine WG972-E2 and DF972-E2. It is divided into three parts, "General",

"Mechanism" and "Servicing".

■General

Information on the general precautions, check and maintenance and special tools.

■Mechanism

Information on the construction and function are included. This part should be

understood before proceeding with troubleshooting, disassembling and servicing.

■Servicing

There are troubleshooting, servicing specification lists, checking and adjusting,

disassembling and assembling, and servicing which cover procedures, precautions,

factory specifications and allowable limits.

All information illustrations and specifications contained in this manual are based on

the latest product information available at the time of publication.

The right is reserved to make changes in all information at any time without notice.

July 2005

KiSC issued 01, 2006 A

WG972-E2, DF972-E2, WSM SAFETY INSTRUCTIONS

SAFETY INSTRUCTIONS

BEFORE SERVICING AND REPAIRING

•Readallinstructionsandsafetyinstructionsinthis

manual and on your generator safety decals.

•Cleantheworkareaandgenerator.

•Parkthemachineonafirmandlevelground,andset

the parking brake.

•Lowertheimplementtotheground.

•Stoptheengine,andremovethekey.

•Disconnectthebatterynegativecable.

•Hanga “DO NOT OPERATE” tag in operator

station.

SAFETY FIRST

This symbol, the industry’s “Safety Alert Symbol”, is used throughout this manual and on labels on

the machine itself to warm of the possibility of personal injury. Read these instructions carefully.

It is essential that you read the instructions and safety regulations before you attempt to repair or use

this unit.

DANGER : Indicates an imminently hazardous situation which, if not avoided, will result in

death or serious injury.

WARNING : Indicates a potentially hazardous situation which, if not avoided, could result in

death or serious injury.

CAUTION : Indicates a potentially hazardous situation which, if not avoided, may result in

minor or moderate injury.

■IMPORTANT : Indicates that equipment or property damage could result if instructions are not

followed.

■NOTE : Gives helpful information.

KiSC issued 01, 2006 A

WG972-E2, DF972-E2, WSM SAFETY INSTRUCTIONS

SAFETY STARTING

•Donotstarttheenginebyshortingacrossstarter

terminals or bypassing the safety start switch.

•Donotalterorremoveanypartofmachinesafety

system.

•Beforestartingtheengine,makesurethatallshift

levers are in neutral positions or in disengaged

positions.

•Neverstarttheenginewhilestandingonground.

Start the engine only from operator’s seat.

SAFETY WORKING

•Donotworkonthemachinewhileundertheinfluence

of alcohol, medication, or other substances or while

fatigued.

•Wearclosefittingclothingandsafetyequipment

appropriate to the job.

•Usetoolsappropriatetothework.Markshifttools,

parts, and procedures are not recommended.

•Whenservicingisperformedtogetherbytwoormore

persons, take care to perform all work safely.

•Donotworkunderthemachinethatissupported

solely by a jack. Always support the machine by

safety stands.

•Donottouchtherotatingorhotpartswhiletheengine

is running.

•Neverremovetheradiatorcapwhiletheengineis

running, or immediately after stopping. Otherwise, hot

water will spout out from radiator. Only remove

radiator cap when cool enough to touch with bare

hands. Slowly loosen the cap to first stop to relieve

pressure before removing completely.

•Escapingfluid(fuelorhydraulicoil)underpressure

can penetrate the skin causing serious injury. Relieve

pressure before disconnecting hydraulic or fuel lines.

Tighten all connections before applying pressure.

AVOID FIRES

•Fuelisextremelyflammableandexplosiveunder

certain conditions. Do not smoke or allow flames or

sparks in your working area.

•Toavoidsparksfromanaccidentalshortcircuit,

always disconnect the battery negative cable first and

connect it last.

•Batterygascanexplode.Keepsparksandopen

flame away from the top of battery, especially when

charging the battery.

•Marksurethatnofuelhasbeenspilledontheengine.

KiSC issued 01, 2006 A

WG972-E2, DF972-E2, WSM SAFETY INSTRUCTIONS

VENTILATE WORK AREA

•Iftheenginemustberunningtodosamework,make

sure the area is well ventilated. Never run the engine

in a closed area. The exhaust gas contains poisonous

carbon monoxide.

PREVENT ACID BURNS

•Sulfuricacidinbatteryelectrolyteispoisonous.Itis

strong enough to burn skin, clothing and cause

blindness if splashed into eyes. Keep electrolyte

away from eyes, hands and clothing. If you spill

electrolyte on yourself, flush with water, and get

medical attention immediately.

DISPOSE OF FLUIDS PROPERLY

•Donotpourfluidsintotheground,downadrain,or

into a stream, pond, or lake. Observe relevant

environmental protection regulations when disposing

of oil, fuel, coolant, electrolyte and other harmful

waste.

PREPARE FOR EMERGENCIES

•Keepafirstaidkitandfireextinguisherhandyatall

times.

•Keepemergencynumbersfordoctors,ambulance

service, hospital and fire department near your

telephone.

KiSC issued 01, 2006 A

WG972-E2, DF972-E2, WSM IMPORTANT ITEMS OF EXHAUST EMISSION REGULATION

IMPORTANT ITEMS OF EXHAUST EMISSION

REGULATION

W1028060

W1028104

W1034885

■To c o nf or m w it h U. S. E PA a n d C AR B S OR E s ( S m a ll O ff R o ad E n g i n e s) e m i s s io n r e g u l at io ns , t h e W G9 7 2- E 2 /

DF972-E2 engine must observe below items.

1. INLET AND EXHAUST SYSTEM

The WG972-E2 / DF972-E2 engine must use the below air cleaner and inlet pipe, and exhaust back pressure of the

muffler must be within the below values.

Part Part No.

Genuine air cleaner 1G657-1101-1

Genuine inlet pipe EG561-1164-1

Brake horse power SAE net int. Allowable maximum exhaust back pressure

23.1 kW (31.0 HP) / 3600 min−1(rpm) 19.6 kPa (147.1 mmHg) / 3600 min−1(rpm)

Any modifications to the fuel system or any adjustments made on this engine will cause this engine to be in

non-compliance with emission regulations.

2. ALTITUDE COMPENSATION KIT

■IMPORTANT

●Altitude compensation kit is applied for EPA and CARB certified engines only.

EPA and CARB emission regulations require the ultimate user 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 guarantied 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.

●See page S-19: "Replacement of Altitude Compensation Kit" for reference to the exchange of altitude

compensation kit.

Altitude Compensation Kit Applicable Altitude Ranges

Original Carburetor (with 0 m kit)

1000 m compensation kit

2000 m compensation kit

3. LPG REGULATOR WITH VAPORIZER (DF972-E2)

When operating DF972-E2 on LP Gas, only a KUBOTA GENUINE LPG REGULATOR KIT can be used.

KiSC issued 01, 2006 A

WG972-E2, DF972-E2, WSM IMPORTANT ITEMS OF EXHAUST EMISSION REGULATION

*GPA means Gas Processors Association (U.S.A.)

W1028533

4. KUBOTA RECOMMENDED LPG FUEL SPECIFICATIONS (DF972-E2)

· Commercial Propane gas only.

· Equivalent to Propanes H-D-5 of GPA* standards.

(vol %)

C3H8C3H6C4H10 Others

90 % 5 % 2.5 % –

5. LENGTH OF THE LPG VAPOR HOSE (DF972-E2)

The length of the LPG vapor hose between the LPG carburetor and its regulator must be within 280 to 320 mm

(11.02 to 12.60 in.).

The incorrect use of the hose may not conform to EPA and CARB EMISSION REGULATIONS.

KiSC issued 01, 2006 A

WG972-E2, DF972-E2, WSM SPECIFICATIONS

SPECIFICATIONS

* The specification described above is of the standard engine of each model.

* Conversion Formula : HP = 0.746 kW, PS = 0.7355 kW

W1028103

Model WG972-E2 DF972-E2

Number of Cylinder 3

Type Vertical, water cooled, 4-cycle

Gasoline engine

Vertical, water cooled, 4-cycle Dual Fuel (Gasoline / LPG) engine

Gasoline fuel LPG fuel

Bore ×Stroke 74.5 x 73.6 mm (2.93 x 2.90 in.)

Total Displacement 962 cm3(58.70 cu.in.)

ISO Net Continuous 18.7 kW / 3600 min-1 (rpm)

25.0 HP / 3600 min-1 (rpm)

17.5 kW / 3600 min-1 (rpm)

23.5 HP / 3600 min-1 (rpm)

ISO / SAE Net Intermittent 23.1 kW / 3600 min-1 (rpm)

31.0 HP / 3600 min-1 (rpm)

22.0 kW / 3600 min-1 (rpm)

29.5 HP / 3600 min-1 (rpm)

SAE Gross Intermittent 24.2 kW / 3600 min-1 (rpm)

32.5 HP / 3600 min-1 (rpm)

23.1 kW / 3600 min-1 (rpm)

31.0 HP / 3600 min-1 (rpm)

Maximum Bare Speed 3850 to 3950 min-1 (rpm)

Minimum Bare Idling Speed 1400 to 1600 min-1 (rpm)

Cylinder Head Overhead-Valve

Ignition System Distributor-Less Solid Stage Type

Governor Centrifugal Ball Mechanical Type / Electronic Governor

Direction of Rotation Counter-Clockwise (Viewed from flywheel)

Spark Plug NGK BKR4E

Ignition Timing 0.366 rad (21 °) before T.D.C. / 3600 min-1 (rpm)

Firing Order 1-2-3

Compression Ratio 9.2 : 1

Lubricating System Forced Lubrication by Trochoid Pump

Oil Pressure Indication Electrical Type Switch

Lubricating Filter Full Flow Paper Filter (Cartridge Type)

Cooling System Pressurized Radiator (not included in the basic model), Forced Circulation with Water Pump

Starting System Electric Starting with Starter

Starting Motor 12V, 1.0 kW

Battery 12 V, 2.5 kW

Charging Alternator 12 V, 150 W

Fuel *Unleaded Automobile Gasoline Standard Commercial LP Gas

Lubricating Oil Better than SH Class (API)

Lubricating Oil Capacity 3.4 L (3.59 U.S.qts)

Weight (Dry) 72.0 kg (158.7 lbs)

Application General Power Source

KiSC issued 01, 2006 A

WG972-E2, DF972-E2, WSM SPECIFICATIONS

*GPA means Gas Processors Association (U.S.A.)

W1032351

KUBOTA RECOMMENDED LPG FUEL SPECIFICATIONS

· Commercial Propane gas only.

· Equivalent to Propanes H-D-5 of GPA* standards.

(vol %)

C3H8C3H6C4H10 Others

90 % 5 % 2.5 % –

KiSC issued 01, 2006 A

WG972-E2, DF972-E2, WSM PERFORMANCE CURVES

PERFORMANCE CURVES

(1) Brake Horsepower

(2) Engine Speed

(3) Specific Fuel Consumption

(4) Torque

(5) Net Intermittent Torque

(6) Net Continuous Torque

(7) Net Intermittent Brake

Horsepower

(8) Net Continuous Brake

Horsepower

(9) Net Intermittent Specific Fuel

Consumption

a : Gasoline Use

b : LP Gas Use

KiSC issued 01, 2006 A

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