One 81-page factory workshop manual (OEM #9Y011-01443) covers all sixteen Kubota BG-series diesels, so whether you run a D1005-BG, a D905-BG, or anything up to the V4702-BG, your engine is in here. Servicing specifications for the engine body, lubrication, cooling, fuel, and electrical systems across all four families pair with dimensioned exploded views and exact assembly clearances. SAE flywheel housing data, centrifugal governor regulation broken out by series, and the factory oil and filter-cartridge interval table round it out. Before condemning a hard-start on the 05-series, set fan belt deflection to 7-9 mm at 10 kgf, then confirm glow plug resistance at 1.0-1.2 Ω. Bookmarked throughout, it pulls up on any device so you find the spec before reaching for a wrench.
What's Inside This Kubota Generator Engine Range Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Instructions | - | Safety First, Danger, Warning, Caution, Important, Note, Safety Servicing and Repairing |
| Specifications | - | D905-Bg-Sae, D1005-Bg-Sae, V1205-Bg-Sae, V1305-Bg-Sae, D1105-Bg-Sae, V1505-Bg-Sae, D1403-Bg-Sae, D1703-Bg-Sae |
| Dimensions | - | D905-Bg, D1005-Bg, D1105-Bg, V1205-Bg, V1305-Bg, V1505-Bg, D1403-Bg, D1703-Bg |
| Feature | - | Main Features of "Bg" Type Engines (Quite Power, High-Capacity Governor and Largesize Flywheel, Economical Fuel Consumption, Low Maintenance Cost, Quick and Easy Starting, Sae Standard Housing and Flywheel, Kubota Diesel Engine for Standby Power Generator, Usable Both at 50 Hz and 60 Hz, Clean Exhaust Gas, Large-Capacity Alternator, Easy to Operate) |
| Fuel System | - | Governor, General, Governor Regulation |
| General | - | Applications (General, Direct Connection to Housing, Operating Mechanism, Supporting Method, Covering), Sae Flywheel & Flywheel Housing for "Bg" Type, Servicing Specifications |
| Servicing Specifications | - | Series (Engine Body, Lubricating System, Cooling System, Fuel System, Electrical System) |
| Maintenance Interval (Engine Oil and Oil Filter Cartridge) | - | Changing Engine Oil, Changing Oil Filter Cartridge, Lubricating Oil |
| Engine Body | - | Disassembling and Assembling (Gear Case, Speed Control Plate, Fork Lever, Mm Stroke Series, Governor Spring and Speed Control Plate) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| D905-BG, D1005-BG, D1105-BG, V1205-BG, V1305-BG, V1505-BG | ||
| Oil filter cartridge replacement interval (Initial) | 50 hrs | p. 77 |
| Oil filter cartridge replacement interval (Regular) | Every 300 hrs | p. 77 |
| Glow plug resistance | 1.0 to 1.2 Ω | p. 57 |
| Fan belt tension | 7 to 9 mm/10 kgf (0.28 to 0.35 in./10 kgf, 22.1 lbs.) | p. 56 |
| Radiator cap air leakage | 10 seconds or more (0.9→0.6 kgf/cm², 88→59 kPa, 13→9 psi) | p. 56 |
| Thermostat's valve opening temperature | 69.5 to 72.5°C (157.1 to 162.5°F) | p. 56 |
| Temperature at which thermostat completely opens | 85°C (185°F) | p. 56 |
| D1403-BG, D1703-BG, V1903-BG, V2203-BG, V2003-T-BG, F2803-BG | ||
| Glow plug resistance | 0.8 Ω | p. 63 |
| Fan belt tension | 10 to 12 mm/10 kgf (0.394 to 0.472 in./22.1 lbs.) | p. 62 |
| Radiator cap air leakage | 10 seconds or more (0.9→0.6 kgf/cm², 88→59 kPan2, 13→9 psi) | p. 62 |
| D905-BG, D1005-BG, V1205-BG, V1305-BG, D1105-BG, V1505-BG, D1403-BG, D1703-BG, V1903-BG, V2203-BG, F2803-BG, V2003-T-BG, V3300-BG, V3300-T-BG, D3502-BG, V4702-BG | ||
| Governor Regulation | Less than 5% | p. 6 |
| Cylinder Head Surface Flatness (Allowable Limit) | 0.05 mm | p. 52 |
Kubota Generator Engine Range Common Problems This Manual Covers
Kubota D1403-BG engine turns over slowly or has a very long crank time in cold weather p. 63
Measure glow plug resistance to confirm the preheat system works, and replace any plug reading outside the 0.8 Ω spec on page 63. Bleed the fuel lines fully after checking for air leaks, and inspect the starter commutator.
Manual Section: Electrical System Servicing SpecificationsRepeated coolant boil-over and rapid engine overheating under heavy electrical generator load p. 69
Work through the cooling system for correct operation. Set fan belt tension to 10 to 12 mm/10 kgf (22.1 lbs) per page 69, then pressure-test the radiator cap and confirm it holds for at least 10 seconds.
Manual Section: Cooling System Servicing SpecificationsExcessive engine blow-by, smoky exhaust, and noticeable power loss during continuous operation p. 77
Drain the crankcase and check the oil level on level ground. Renew the oil filter cartridge after the first 50 hrs, then every 300 hrs as noted on page 77, and examine cylinder head flatness if the symptoms hang on.
Manual Section: Maintenance Interval (Engine Oil and Oil Filter Cartridge)Unstable speed on the D905-BG under heavy load, rough engine idle, and frequent misfires p. 6
Load-test the engine speed and confirm governor regulation stays under 5 percent, the figure given on page 6. Drain the fuel system to rule out water, then pull and clean the injectors if the idle stays rough.
Manual Section: SpecificationsFrequently Asked Questions
What are the replacement specifications for oil filter cartridge?
Every BG-series engine uses a Cartridge Type full-flow paper oil filter, though the change interval splits by model. The 05 Series, including the D1005-BG, and the 92.4 mm Stroke Series take an initial swap at 50 hours, then every 300 hours. The F2803-BG, V3300-BG, V3300-T-BG, D3502-BG, and V4702-BG go to 60 hours first, then every 400 hours.
What should I check when the Kubota BG-series engine cranks slowly or is hard to start in cold weather?
Measure glow plug resistance and replace any plug reading outside 0.8 Ω (page 63). Bleed the fuel lines fully after checking for air leaks, and inspect the starter commutator. The manual also calls out verifying the preheat system operates correctly before condemning the starter.
How do I diagnose repeated coolant boil-over and overheating under generator load on BG-series engines?
Set fan belt tension to 10 to 12 mm deflection at 10 kgf (22.1 lbs) per page 69, then pressure-test the radiator cap and confirm it holds pressure for at least 10 seconds. Work through the full cooling system check for correct operation before condemning the thermostat or water pump.
Why does my Kubota D905-BG have unstable speed under load, rough idle, and frequent misfires?
Load-test the engine speed and confirm governor regulation stays under 5 percent as specified on page 6. Drain the fuel system to rule out water contamination, then pull and clean the injectors if the idle stays rough. The manual lists governor regulation figures broken out by series for comparison.
Is this Kubota D1005-BG & variants Workshop Manual a digital download?
Yes. Download the full 81-page searchable Workshop Manual right away and open it on any device, from a laptop at your desk to a phone in the field.
Can I print this manual?
Yes, the PDF ships DRM-free, so you can print whatever sections you need for the shop on standard letter or A4 paper.
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