Kubota DF752-E2 Gasoline & LPG Engine Repair Service Manual

WORKSHOP MANUAL GASOLINE / LPG ENGINE Kubota Printed in U.S.A. 981-0538 1-2003

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 Engines (WG 752-E2 and DR52-E2). It is divided into two parts, "Mechanism" and "Servicing". Mechanism Information on the construction and function are included. This part should be understood before proceeding with troubleshooting, disassembling and servicing. I Servicing Under the heading "General" comes general precautions, check and maintenance and special tools. For each Engine and Generator section, 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. Due to covering many models of this manual, illustration being used, have not been specified as one model. February 2001 0 KUBOTA Corporation 2001

V:G752-E2 - DRI2-E2, VZSY SAFETY INSTRUCTIONS This symbol, the industry’s “Safety Alert Symbol”, is used throughout this manual and decals on the It is essential that you read the instructions and safety regulations before you attempt to repair or use engine itself to warn of the possibility of personal injury. Read these instructions carefully. this unit. i /I A SAFETY FIRST /I I WARNING : Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. I CAUTION :Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. ~ I ~ -~ IMPORTANT : Indicates that equipment or property damage could result if instructions are not followed. I I I MNOTE : Gives helpful information. BEFORE SERVICING AND REPAIRING Read all instructions and safety instructions in this manual and on your engine safety decals. Clean the work area and engine. Place the engine on a firm and level ground. Allow the engine to cool before proceeding. Stop the engine, and remove the key. Disconnect the battery negative cable.

WG752-E2 DR58E2, ilrSF.1 SAFETY INSTRUCTIONS I ~ I .I 2 SAFETY STARTING Do not start the engine by shorting across starter terminals. Unauthorized modifications to the engine may impair the function and I or safety and affect engine life. SAFETY WORKING Do not work on the engine while under the influence of alcohol, medication, or other substances or while fatigued. Wear close fitting clothing and safety equipment appropriate to the job. Use tools appropriate to the work. Makeshift tools, parts, and procedures are not recommended. When servicing is performedtogether by two or more persons, take care to perform all work safely. Do not touch the rotating or hot parts while the engine is running. Never remove the radiator cap while the engine is 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 (fuel) under pressurecan penetratethe skin causing serious injury. Relieve pressure before disconnecting fuel lines. Tighten all connections before applying pressure. Wear a suitable hearing protective device such as earmuffs or earplugs to protect against objectionable or uncomfortable loud noises AVOID FIRES Fuel is extremely flammable and explosive under certain conditions. Do not smoke or allow flames or sparks in your working area. To avoid sparks from an accidental short circuit, always disconnect the battery negative cable first and connect it last. Battery gas can explode. Keep sparks and open flame away from the top of battery, especially when charging the battery. Make sure that no fuel has beenspilled on the engine. . 2

80 VENTILATE WORK AREA If the engine must be running to do some work, make sure the area is v;el ventilated. Never run the engine in a closed area. The exhaust gas contains poisonous carbon monoxide. PREVENT ACID BURNS Sulfuric acid in battery electrolyte is poisonous. It is 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 Do not pour fluids into the ground, down a drain, 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 Keep a first aid kit and fire extinguisher handy at all times. Keep emergency numbers for doctors, ambulance service, hospital and fire department near your telephone.

VJG752-E - DF752-E2. VfShl IFillPORTANT ITEMS OF EXHAUST EMISSION REGULATION Brake horse power I SAE net int. 17.1 kW (23 HP) / 3600 rpm IMPORTANT ITEMS OF EXHAUST EMISSION REGULATION Allowable maximum exhaust back pressure 19.6 kPa (1 47.1 mmHg) / 3600 rpm H To conform with US. EPA and CARB SORES (Small Off Road Engines) emission regulations, the WG752-E2 / DF752-E2 engine must observe below items. 1. INLET AND EXHAUST SYSTEM The WG752-E2 / DF752-E2 engine must use the below air cleaner and inlet pipe, and exhaust back pressure of the muffler must be within the below values. I W1028060 W1028104 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 EPA and CARB emission regulations require the ultimate users, as their obligation, to improve the emission of the non-road SI engine under 19 kW install the appropriate genuine altitude compensation kit. The engine manufacturer provides this kit in case 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 user of SI engines must comply with this regulation through the installation of the appropriate Altitude compensation kit for the altitude range the engine will operate. See page S-67 for reference to the exchange of altitude compensation kit. Altitude Kit I Altitude Ranges 1 Original carburetor (with 0 m kit) 700 m I ") (2300ft) 300 m Original carburetor with 1000 rn kit (1 000 ft) 2700 m - (8900 ft) 1300 m (4300 ft) Original carburetor with 2000 m kit * If you have lost Original carburetor's jet, please buy the 0 rn kit. W1034885 3. LPG REGULATOR WITH VAPORIZER (DF7521E2) When operating DF752-EZ on LP Gas, only a KUBOTA GENUINE LPG REGULATOR KIT can be used. 4

4. KUBOTA RECOMMENDED LPG FUEL SPECIFICATIONS (DF752-E2) - Commercial Propane gas only. - Equivalent to Propanes H-D-5 of GPA" standards. C3H8 290% C3H6 C4HI0 Others 65% S2.5% - W1028533 5. LENGTH OF THE LPG VAPOR HOSE (DF752-E2) The length of the LPG vapor hose between the LPG carburetor and its regulator must be within 300 k 20 mm (11.8 2 0.8 in.). The incorrect use of the hose may not conform to EPA and GARB EMISSION REGULATIONS. 5

VJG752-E2 - DF752-E2. VJSM SPECIFICATIONS Vertical, vjater cooled, 4-cycle Gasoline engine SPECIFICATIONS Vertical, water cooled, +cycle Dual Fuel (Gasoline I LPG) engine Gasolinefuel LPG fuel I Model I WG752-E2 I DF752-E2 I Bore x Stroke Total Displacement ~. 68 x 68 mm (2.68 x 2.68 in.) 740 cc (45.21 cu.in.) I Number of Cylinders I 3 I Brake Horsepower . . . . SAE Net 16.4 kW / 3600 rpm (IntermittentH.P.) (22.0 HP / 3600 rpm) SAE Gross 17.7 kW / 3600 rpm (Intermittent H.P.) (24.8 HP 13600 rpm) (23.8 HP I3600 rpm) 17.1 kW 13600 rpm (23.0 HP / 3600 rpm) 18.5 kW 13600 rpm I SAE Net (Cont. H.P.) I I Maximum Bare Speed 13.4 kW 3600 rpm (18.0 HP 13600 rpm) 3900 5 100 rpm 12.7 kW I 3600 rpm (1 7.0 HP I3600 rpm) 1 Minimum Bare Idling Speed 1500 f 100 rpm Cvlinder Head 1 Ignition System I Full-Transistor (Distributortype) I Overhead-Valve Governor Direction of Rotation Centrifugal BaKType MechanicalGovernor Counter-Clockwise (Viewed From Flywheel) I Firing Order I 1-2-3 I Spark Plug NGK BKR4E-11 lonition Timing B.T.D.C. 18 5 1 Compression Ratio LubricatingSystem ~ ~ ~~~ ~~ ~ 9.2 : 1 Forced Lubricationby Trochoid Pump Oil Pressure Indication LubricatingFilter *KUBOTA RECOMMENDED LPG FUEL SPECIFICATIONS - Equivalent to Propanes H-D-5 of GPA* standards. Commercial Propane gas only. Electrical Type Switch Full Flow Paper Filter (CartridgeType) (vol %) Cooling System Starting System PressurizedRadiator (not included in the basic model), Forced Circulationwith Water Pump Electric Starting with Cell Starter (12 V, 0.7 kW) W1031368 Battery Alternator Fuel 12 V, 35 AH or Equivalent 12V, 150 W 'Unleaded Automobile Gasoline I *Standard Commercial LP Gas LubricatingOil LubricatingOil Capacity Better Than SF Class (API) 3.25 L (3.4 us. qts) Weight (Dry) Application 61.7 kg (136.0 Ibs) General Power Source C3H8 I C3H6 290% I 65% C4H10 Others S2.5% - I

Kubota DF752-E2 Gasoline & LPG Engine Repair Service Manual

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