Part of the Kubota Repair Manuals.
This is the Kubota Workshop Manual for the WG1005 gasoline engine and the DF1005 gasoline or LPG engine, covering model years 2001 to 2012. It is the 106 page factory service document in English, with specifications, mechanism descriptions, a wiring diagram, and full servicing procedures.Because the DF1005 runs on both gasoline and LPG, the manual details the carburetor, the LPG vaporizer, the digital ignition system, and the fuel cut off solenoid settings for each fuel. You also get compression pressure, valve clearance, spark plug gap, tightening torques, and the checking procedures for the fuel, cooling, lubricating, ignition, and electrical systems.Use it to diagnose a running fault, set the engine back to factory specification, and rebuild the starter or alternator. Download the PDF once and read it on a computer, tablet, or phone, or print the pages you need for the bench.
What's Inside This Kubota WG1005, DF1005 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Instructions | 3-5 | Safety First, Before Servicing and Repairing, Safety Starting, Safety Working, Avoid Fires, Ventilate Work Area, Prevent Acid Burns, Dispose of Fluids Properly |
| Important Items of Exhaust Emission Regulation | 6-7 | Inlet and Exhaust System, Altitude Compensation Kit, Lpg Regulator with Vaporizer, Kubota Recommended Lpg Fuel Specifications, Length of the Lpg Vapor Hose |
| Specifications | 8 | WG1005 Engine Specifications, DF1005 Engine Specifications, Kubota Recommended Lpg Fuel Specifications |
| Performance Curves | 9 | WG1005 and DF1005: Gasoline, Df1005: Lpg, Engine Speed RPM |
| Dimensions | 10 | Engine Dimensions Overview, Standard Fan Position Dimensions, Low Fan Position Dimensions |
| Wiring Diagram | 11-12 | Main Wiring Diagram, Wiring Components, Color Code for Wiring |
| Engine Body | 13-16 | Cylinder Block, Cylinder Head (Intake and Exhaust Port, Combustion System), Crankshaft, Piston and Piston Rings, Connecting Rod, Rocker Arm, Camshaft, Flywheel |
| Lubricating System | 17-19 | Oil Pump, Relief Valve, Oil Filter Cartridge, Oil Pressure Switch |
| Cooling System | 20-22 | Water Pump, Thermostat, Radiator, Radiator Cap, Vaporizer for Lpg Fuel |
| Fuel System | 23-30 | Carburetor for Gasoline Fuel, Df Carburetor (Lpg Fuel), Vaporizer for Lpg Fuel (Primary Chamber, Secondary Chamber, Vacuum Lock Chamber), Governor, Inlet Manifold |
| Ignition System | 31 | Degital Ignition System (General, Control at Ignition Time, Control at Energizing Time, Lock Prevention, Over-Speed Limits Control) |
| Electrical System | 32-34 | Charging System, Alternator Characteristics, Ic Regulator Characteristics (Alternator) |
| General (Servicing) | 35-60 | Engine Identification (Model Name and Engine Serial Number, Cylinder Number), Tightening Torques (Special Use Screws, Bolts and Nuts, General Use Screws, Bolts and Nuts) |
| Engine Body (Servicing) | 61-87 | Checking and Adjusting (Compression Pressure, Top Clearance) |
| Lubricating System (Servicing) | 88-89 | Checking (Engine Oil Pressure), Servicing (Clearance Between: Inner Rotor and Outer Rotor, Outer Rotor and Pump Body, Inner Rotor and Cover) |
| Cooling System (Servicing) | 90-92 | Checking and Adjusting (Fan Belt Tension, Fan Belt Damage and Wear, Radiator Cap Air Leakage, Radiator Water Leakage, Thermostat Valve Opening Temperature) |
| Fuel System (Servicing) | 93-95 | Checking and Adjusting (Governor, Engine Speed, Carburetor, Vaporizer Lpg Model) |
| Ignition System (Servicing) | 96-97 | Checking (Timing Light Test, Spark Plug, Ignition Coil, Ignitor, Pick-Up Sensor) |
| Electrical System (Servicing) | 98-106 | Checking (Starter, Fuel Cut Off Solenoid), Disassembling and Assembling (Starter, Alternator), Servicing (Starter, Alternator, Rectifier, Ic Regulator) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cylinder head cover cap nuts tightening torque | 6.9 to 8.8 N-m (0.7 to 0.9 kgf.m, 5.1 to 6.5 ft-lbs) | p. 38 |
| Cylinder head screws tightening torque | 63.7 to 68.6 N-m (6.5 to 7.0 kgf.m, 47.0 to 50.6 ft-lbs) | p. 38 |
| Total Displacement | 996 cc (60.89 cu.in.) | p. 8 |
| Lubricating Oil Capacity | 4.6 L (4.8 U.S.qts.) | p. 50 |
| Spark Plug Gap (NGK BKR4E) | 0.7 mm (0.0276 in.) | p. 46 |
| Valve Clearance (Cold) | 0.145 to 0.185 mm (0.0057 to 0.0073 in.) | p. 41 |
| Cylinder Head Screws Torque | 63.7 to 68.6 N-m (6.5 to 7.0 kgf.m, 47.0 to 50.6 ft-lbs) | p. 38 |
| Connecting Rod Screws Torque | 41.2 to 46.1 N-m (4.2 to 4.7 kgf.m, 30.4 to 34.0 ft-lbs) | p. 38 |
| Compression Pressure (Factory Spec) | 1.27 MPa (13.0 kgf/cm², 185 psi) | p. 41 |
| Fan Belt Tension (Deflection) | 7.0 to 9.0 mm (0.28 to 0.35 in.) | p. 45 |
| Thermostat Valve Opening Temperature (At Beginning) | 69.5 to 72.5 °C (157.1 to 162.5 °F) | p. 45 |
| Fuel Cut Off Solenoid for Gasoline Resistance | 38 Ω at 20 °C | p. 46 |
Kubota WG1005, DF1005 Common Problems This Manual Covers
Hard starting or no spark
A no-start or intermittent misfire on these engines often traces to the digital ignition, a fouled spark plug, or a failing pickup sensor. The Ignition System servicing section covers the timing light test, spark plug, ignition coil, and pickup checks.
Manual Section: Ignition System (Servicing) p. 96Rough idle and fuel mixture faults
Surging, rough idle, or poor response points to the carburetor, governor, or the LPG vaporizer setting. The Fuel System servicing section covers governor, engine speed, carburetor, and vaporizer adjustment.
Manual Section: Fuel System (Servicing) p. 93Low compression and power loss
Worn rings, valves, or excess top clearance drop compression and leave the engine weak. The Engine Body servicing section gives the compression pressure and top clearance checking procedures.
Manual Section: Engine Body (Servicing) p. 61Overheating
A slack fan belt, stuck thermostat, or a radiator cap that will not hold pressure pushes coolant temperature up. The Cooling System servicing section covers fan belt tension, thermostat opening temperature, and radiator cap testing.
Manual Section: Cooling System (Servicing) p. 90Low engine oil pressure
A falling oil pressure reading points to a worn oil pump or excess rotor clearance. The Lubricating System servicing section gives the oil pressure check and the rotor and pump body clearances.
Manual Section: Lubricating System (Servicing) p. 88No charge or dead battery
A battery that runs down or a starter that will not crank traces to the charging system or the starter itself. The Electrical System servicing section covers starter and alternator checks, disassembly, and the IC regulator.
Manual Section: Electrical System (Servicing) p. 98Frequently Asked Questions
Which engines does this manual cover?
It covers the Kubota WG1005 and DF1005 engines for model years 2001 to 2012. The WG1005 runs on gasoline; the DF1005 runs on gasoline or LPG.
Does it cover the LPG fuel system?
Yes. The Fuel System section covers the DF carburetor, the LPG vaporizer, and the governor, and the servicing section adds the checking and adjustment procedures. p. 23
Does it list torque specs and clearances?
The General servicing section lists tightening torques for general and special use fasteners, and the engine body servicing coverage gives compression pressure and valve clearance. p. 35
Is a wiring diagram included?
Yes. The Wiring Diagram section provides the main wiring diagram, the wiring components, and the color code for the harness. p. 11
What do I get after purchasing this Kubota WG1005 manual?
It's a 106-page searchable PDF you can download right after checkout. Pull it up on your phone under the hood, on a laptop, wherever. No shipping, no waiting.
Can I print this manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Can I find wiring schematics in this Kubota WG1005 manual?
Yes. The full electrical schematics are included, with wire colors, connector locations, and circuit descriptions.
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