Kubota D905BG-2 Engine

The cheapest captured merchant offer per filter — see the full cross-reference below for every OEM/aftermarket option.

Prices captured from merchant listings; some links are affiliate links. Verify against your serial number before ordering.

Shared across brands: FG Wilson, Kohler

How to read your Kubota engine serial & model number →

• Will not start (cranks okay)
  Fix: Replenish, Check continuity, Replace fuel feed pump, Clean or replace element, Troubleshoot engine, Bleed air, Drain, flush fuel system, Check injectors, Check compression, Use proper type of fuel; consult fuel supplier, Use proper lube oil, Check valve clearance, Replace filter, Check continuity, Check relay coil continuity, Service/Engine Service Manual
• Will not carry load pump
  Cause: Defective injection pump or runs rough
  Fix: Check injection pump, engine speed using frequency meter or tachometer. NOTE: Hz x 120/No. of rotor poles = rpm (Example: 60 x 120/4 = 1800)
• Unit is noisy
  Cause: Excessive vibration—engine/generator, Exhaust system leak, Broken or damaged vibro mounts, Loose or vibrating sheet metal/housing, Inadequate compartment clearances, Exhaust piping or air inlets/outlets not securely installed, No compartment sound insulation
  Fix: Check and replace as necessary, Check and replace as necessary, Retighten screws, Check clearances, Inspect for loose parts, Install fireproof insulation, Check rotor, crankshaft, bearing, etc. (Disassembly of engine and/or generator may be required)
• Starter does not work properly
  Cause: Loose or corroded wiring, Low battery output, Defective starter relay, Defective start/stop switch, Defective wiring, Battery cables undersize
  Fix: Clean and tighten loose connections, Check electrolyte level and specific gravity (batteries with filler caps only), Check starter relay, Replace starter relay, as necessary, Replace switch, Check wiring, Replace starter, Select proper size cable
• Starter cranks slowly
  Cause: Low battery output, Too heavy viscosity lube oil, Loose or corroded wiring, High starter current draw, Battery cable undersize
  Fix: Check electrolyte level and specific gravity (batteries with filler caps only), Use proper viscosity oil, Clean and tighten loose connections, Repair/Replace starter, Select proper size cable
• Overheats
  Cause: Improper cooling, Air cleaner clogged
  Fix: Check cooling system (Check hoses for blockage and components for function.), Clean or replace element
• Operates erratically
  Cause: Air cleaner clogged
  Fix: Clean or replace element
• Open wiring (P1 or P2 connector)
  Fix: Check continuity
• No/low oil pressure (time delay of 5-10 seconds on E-239563 circuit board)
  Fix: Correct fault condition; Section 9. Wiring Diagrams
• No generator output voltage
  Cause: Optional AC output circuit breaker open or defective, Optional AC circuit breaker tripping due to overload on unit, Transfer switch in OFF or other power source position, No battery voltage to terminal (+) and (-) of voltage regulator during cranking, Fuse blown in voltage regulator circuit (lead 55), Short circuit in coach wiring causing circuit breaker to trip, Open wiring, terminals or pin in aux. winding circuit (field flashing), Defective rotor (open, grounded, or shorted windings), Defective stator (open, grounded, or shorted windings), Open D5 or D8 diode
  Fix: Check position of circuit breaker, Check AC voltage on generator side of circuit breakers, Reduce load, Reset and attempt startup, Turn handle to proper position, Check for 12 VDC at voltage regulator (+
• Low oil pressure (LOP) or high water temperature (HWT) fault
  Fix: Correct fault condition
• Lacks power
  Cause: Governor not properly adjusted or defective, Air cleaner clogged, Carbon build-up, Improper cooling, Engine overloaded, Stale or bad fuel, Fuel line restriction, Dirty fuel filter
  Fix: Check engine speed using frequency meter or tachometer. NOTE: Hz x 120/No. of rotor poles = rpm (Example: 60 x 120/4 = 1800), Clean or replace element, Clean carbon from cylinder heads, Inspect cooling system, Reduce electrical load, Replace fuel filter
• K1 relay coil defective.
  Fix: Check continuity
• K1 relay coil defective
  Fix: Check continuity
• If LED1 is not lit, K1 relay is not receiving power from stator B1/B2 winding
  Fix: Check oil pressure, oil pump, and low oil pressure shutdown switch

Compiled from service & troubleshooting documentation across every generator set that uses the Kubota D905BG-2.

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

• Air filter: Kubota K318182240 Kubota K318182250 Kubota TD27093230 Kubota TD27093220 Donaldson P778979 Donaldson P780018 Donaldson P526873 Donaldson P778984
• Fuel filter: Kubota 1258143013 Donaldson P550012 Donaldson P550248 Donaldson P550588 Wix 33032 Ac Delco GF142 Wix 33472 Ac Delco TP1069
• Oil filter: Kohler 229678 Kubota 7665025430 Donaldson P550162 Wix 51334 Ac Delco X45

Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.

• Atlas Copco XAS37 — Compressor
• Kaeser MOBILAIR M22 — Compressor

Other equipment known to use this engine, via filter-application cross-reference — useful for sourcing parts even when your exact machine isn't listed elsewhere on this page.