All 128 pages of this Kubota EA300-E2-NB1 and EL300-E2-AR Workshop Manual (OEM #97897-0330) cover the full diesel engine family: EA300-E2-NB1, EA300-E2-NB1-APU, EL300-E2-AR, and EL300-E2-AR-KCL, with individual spec tables and performance curves for each variant. Inside: 30 exploded-view diagrams across every subsystem, troubleshooting charts for no-start conditions, rough idle, exhaust smoke (white/blue and black/dark gray), and deficient output, plus a maintenance schedule with 50-hour and 100-hour check intervals. Your servicing section runs 21 pages deep: cylinder head and valves, piston and connecting rod, crankshaft, timing gear, camshaft, cylinder liner, oil pump, and starter. Torque your cylinder head bolts to 56.9-61.8 N·m (43.4-47.0 ft·lbs); fuel filter goes at every 100 hours. No more hunting numbers across mismatched forum posts. Bookmarked throughout: tap any section, pull the spec, fix it.
What's Inside This Kubota EA300-E2-NB1, EA300-E2-NB1-APU, EL300-E2-AR, EL300-E2-AR-KCL Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety First | 3-5 | - |
| Specifications | 6-7 | EA300-E2-NB1 Specifications, EA300-E2-NB1-APU Specifications, EL300-E2-AR Specifications, EL300-E2-AR-KCL Specifications |
| Performance Curves | 8 | EA300-E2-NB1 and EA300-E2-NB1-APU Performance Curves, EL300-E2-AR and EL300-E2-AR-KCL Performance Curves, Performance Curve Correction Standard |
| Dimensions | 9-15 | EA300-E2-NB1 Dimensions, EA300-E2-NB1-APU Dimensions, EL300-E2-AR Dimensions, EL300-E2-KCL Dimensions, Pulley Shaft, V-Pulley, Flywheel |
| Engine Identification | 16-17 | Model Name and Engine Serial Number, Year of Manufacture Table, Month of Manufacture Table |
| General Precautions | 18 | Parts Arrangement During Disassembly, Use of Genuine Special Tools, Disconnecting Grounding Cable, Cleaning Parts Before Measuring, Use of Genuine Parts for Replacement |
| E2 Engine | 19 | Emission Control Regulations, E2 Model Name Designation, After-Sale Services for E2 Engines |
| Maintenance Check List | 20 | Maintenance Schedule Table, Lubricating Oil Information, Lubricating Oil Class Table, Lubricating Oil Recommendation for Fuel Types |
| Check and Maintenance | 21-23 | Daily Check List, Check Points of Every 50 Hours, Check Points of Every 100 Hours |
| Special Tools | 24-29 | Special Use Puller Set, Piston Ring Compressor, Piston Ring Tool, Wet Liner Puller, Socket Wrench 29, Flywheel Puller, Red Check, Radiator Tester |
| Feature | 30 | EA300 Engine Overview, Engine Type and Cooling, Kubota Technologies Incorporated, E-TVCS Combustion System and Injection Pump |
| Engine Body | 31-38 | Compression Pressure, Decompression Device, Valve Clearance, Top Clearance |
| Lubricating System | 39-41 | Engine Oil Pressure |
| Cooling System | 42-43 | Fan Belt Tension, Radiator Water Tightness, Radiator Cap Air Leakage |
| Intake / Exhaust System | 44 | General, Air Cleaner, Muffler |
| Fuel System | 45-52 | Injection Timing, Pump Element Fuel Tightness, Delivery Valve Fuel Tightness, Fuel Injection Pressure, Fuel Tightness of Nozzle Valve Seat, Nozzle Spraying Condition |
| Electrical System | 53-61 | Fan Dynamo Performance, Starter, Glow Plug |
| Troubleshooting | 62-65 | Engine Does Not Start, Engine Revolution Not Smooth, White or Blue Exhaust Gas Observed, Black or Dark Gray Exhaust Gas Observed, Deficient Output |
| Servicing Specifications | 66-70 | Engine Body Specifications, Lubricating System Specifications, Cooling System Specifications, Fuel System Specifications, Electrical System Specifications |
| Tightening Torques | 71-72 | Tightening Torques for Special Use Screws, Bolts and Nut, Tightening Torques for General Use Screws, Screw and Bolt Material Grades |
| Checking, Disassembling and Servicing | 73-105 | Engine Body (Compression Pressure, Decompression Device, Valve Clearance, Top Clearance), Lubricating System (Engine Oil Pressure) |
| Servicing | 106-128 | Cylinder Head and Valves, Piston and Connecting Rod, Crankshaft, Timing Gear and Camshaft, Cylinder Liner, Oil Pump, Starter |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Cylinder head bolt tightening torque | 56.9 to 61.8 N·m (5.8 to 6.3 kgf·m, 43.4 to 47.0 ft·lbs) | p. 71 |
| Fuel filter replacement interval | Every 100 h | p. 20 |
| Starter armature shaft thrust gap | 0.05 to 1.00 mm (0.0020 to 0.0394 in.) | p. 126 |
| Air cleaner element replacement interval | Every 100 h | p. 20 |
| Air cleaner element cleaning air pressure | 200 kPa or less (2.0 kgf/cm², 30 psi) | p. 22 |
| Oil filter replacement interval | Every 100 h | p. 20 |
| Cylinder head gasket thickness (tightened) | 0.95 to 1.05 mm (0.0374 to 0.0413 in.) | p. 66 |
| EA300-E2-NB1 | ||
| Recommended battery charging capability | 28 to 32 Ah | p. 55 |
| EA300-NB1 | ||
| Glow plug resistance | 0.9 Ω | p. 85 |
| EA300-E2-NB1, EA300-E2-NB1-APU | ||
| Injection timing (static) | 0.45 rad (25.5°) before T.D.C. | p. 70 |
| Engine Oil Capacity | 1.3 L | p. 6 |
| EL300-E2-AR, EL300-E2-AR-KCL | ||
| Injection timing (static) | 0.38 rad (22°) before T.D.C. | p. 70 |
Kubota EA300-E2-NB1, EA300-E2-NB1-APU, EL300-E2-AR, EL300-E2-AR-KCL Common Problems This Manual Covers
Kubota EA300-E2-NB1 clicks when turning the key but the engine will not crank or start p. 62
Inspect the battery connections and verify the charging capability is 28 to 32 Ah as shown on page 55. Test the glow plug resistance to ensure it measures exactly 0.9 Ω. If the starter still fails, check the armature shaft thrust gap and verify it is between 0.05 to 1.00 mm.
Manual Section: Starter System MalfunctionsEngine cranks continuously but does not fire after running out of fuel or servicing the fuel system p. 62
Bleed air from the fuel lines and check the injection pressure on page 70. Verify the fuel injection pressure reaches 13.73 to 14.22 MPa. If pressure is low, inspect the injection pump and replace the fuel filter if it has been in service for more than 100 hours.
Manual Section: Engine Starting IssuesEngine loses power, runs extremely rough under heavy load, and emits thick black exhaust smoke p. 63
Clean the air cleaner element using compressed air regulated to 200 kPa or less, following the procedure on page 22. Inspect the fuel system for restrictions and verify the oil filter has been replaced at the proper 100 h interval to ensure smooth engine revolution under operating loads.
Manual Section: Engine Performance & Exhaust IssuesEngine oil warning lamp illuminates at operating temperature indicating dangerously low oil pressure p. 63
Measure the engine oil pressure at rated speed using a test gauge. Verify the pressure reaches at least 245 kPa as specified on page 69. Drain the system and inspect for fuel contamination, then refill with fresh oil and install a new filter if past the 100 h replacement interval.
Manual Section: Lubrication System ProblemsFrequently Asked Questions
What are the torque specs for Kubota EA300-E2-NB1 cylinder head bolts?
For the Kubota EA300-E2-NB1, the cylinder head stud bolts (M9 x 1.25) should be torqued to 24.5 to 29.4 N·m (2.5 to 3.0 kgf·m, 18.1 to 21.7 ft-lbs). The cylinder head nuts (M9 x 1.25) require a torque of 56.9 to 61.8 N·m (5.8 to 6.3 kgf·m, 43.4 to 47.0 ft-lbs).
What is the injector torque specification for Kubota EA300-E2-NB1?
The injection nozzle holder (M20 x 1.5) for the Kubota EA300-E2-NB1 should be torqued to 49 to 69 N·m (5 to 7 kgf·m, 36 to 51 ft-lbs).
How to torque Kubota EA300-E2-NB1 head bolts
For the Kubota EA300-E2-NB1, the cylinder head stud bolts (M9 x 1.25) should be torqued to 24.5 to 29.4 N·m (2.5 to 3.0 kgf·m, 18.1 to 21.7 ft-lbs). The cylinder head nuts (M9 x 1.25) require a torque of 56.9 to 61.8 N·m (5.8 to 6.3 kgf·m, 43.4 to 47.0 ft-lbs).
What are the replacement specifications for fuel filters?
The fuel filter should be checked every 50 hours and changed every 100 hours, according to the maintenance check list. No specific part numbers or detailed replacement specifications are provided beyond this interval.
What are the replacement specifications for battery?
The battery should be checked every 50 hours. If the battery is used for less than 100 hours in a year, its electrolyte should be checked yearly for refillable batteries. No specific replacement specifications such as voltage or capacity are provided.
What do I get after purchasing this Kubota EA300-E2-NB1, EA300-E2-NB1-APU?
Instant PDF download. You get the full 128-page searchable Workshop Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Am I able to print pages from this Kubota EA300-E2-NB1, EA300-E2-NB1-APU?
Yes. The PDF has no DRM restrictions — print any page or section you need for your shop. Works with any standard printer.
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