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Kubota D1005 Engine

The Kubota D1005 is a 1 L 3-cylinder diesel engine rated at 1800 rpm, producing up to 9.46 kW. It powers generator sets from Cummins/Onan, Generac and Simson-Maxwell, including the MDKAL, MLT3060K, MLT4060 and MLT4060KVLED. It holds 4.25 L (1.1 gal) of oil and 3.78 L (1.0 gal) of coolant.

Also known as: Kubota D1005

Part of the Kubota D1005 engine family — 4 variants share parts & fitment.

1.001 L

Displacement

Cylinders

1800 rpm

Rated speed

9 kW

Gross power

On this pageService parts Specs Generator sets Maintenance Filter cross-reference FAQ Service intervals Torque & specs Fluids Procedures Wiring

Service parts for the D1005

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

Air intake

1 required

K318182240Air filterfind

Oil system

1 required

7665025430Oil filter$7.98PartsGeek

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

Engine specifications

Oil capacity	4.25 L
Coolant capacity	3.78 L
Displacement	1.001 L
Cylinders	3
Aspiration	Diesel
Rated speed	1800 rpm
Gross power	9 kW

Generator sets powered by this engine

Shared across brands: Cummins/Onan, Generac, Simson-Maxwell

Cummins/Onan MDKAL Generac MLT3060K Generac MLT4060 Generac MLT4060KVLED Generac MLT6 Simson-Maxwell SKW8 T6-T4

This engine also powers 2 machine(s) on Power Equipment Info.

How to read your Kubota engine serial & model number →

Common problems

Oil pressure switch failure
Fix: Refer to OEM engine operator’s manual to identify corrective action.
Oil leaking from engine
Cause: Visually inspect the engine for leaks.
Low oil pressure shutdown
Cause: Low oil level
Fix: Verify oil level on dipstick. Add oil, if needed.
High coolant temperature shutdown
Cause: Low coolant level
Fix: Add coolant if needed. Allow engine to cool, then check coolant level in radiator. Restart engine and check coolant temperature. Stop engine immediately if coolant temperature is 210°F (99°C) or more.
Generator output incorrect
Cause: Check the incoming voltage to the ballast by checking the available voltage on the GFCI receptacle. Incoming voltage should be 120V ±5V.
Fix: If voltage is incorrect, the engine speed may need to be adjusted or generator may require service.
Unit cranks but does not start
Cause: Low fuel level
Fix: Check fuel level in tank. Verify fuel pump operation.
Unit cranks, but will not start
Cause: Fuel level low
Fix: Check fuel level in tank. Verify fuel pump operation.
Restricted air filter
Fix: Inspect air filter for blockage.
Mast Lights On But the Light Output is Low
Cause: Fixture and/or lens is dirty. Lamp worn due to normal use. Damaged or loose electrical connections. Generator output incorrect. Low transformer output
Fix: Clean reflective surface inside fixture and both inside and outside surface of glass lens. Use mild soap and water to clean lens. Other chemicals may have an adverse effect on the glass. Replace lamp. Check the mast coil cord, mast junction box and mast light connections.
Low transformer output
Fix: The voltage from the transformer should read approximately 400VAC as the light “strikes” (induces an arc), then drop and slowly rise back up to stabilize at 240–260VAC. On hard wired models, remove the mast junction box cover and insert the wire probes into the connector blocks for the light and ground. If proper voltage is not achieved, perform capacitor check to determine if the capacitor or coil needs to be replaced.
Leakage in coolant hoses, engine block, or water pump
Fix: Inspect
Blockage in radiator
Fix: Inspect radiator shroud and ducting for blockage and remove any foreign matter.
Water Sedimenter - Drain Water
Fix: Drain Water From Water Sediment Separator
Transformer output low
Fix: Verify voltage from transformer: When a bulb strikes (induces an arc), transformer voltage should be approximately 400 VAC. Next, voltage should drop, slowly rise, then stabilize at 240–260 VAC. On hard-wired models, remove mast junction box cover and insert wire probes into the connector blocks of the light and ground. If correct voltage is not achieved, check the capacitor to determine if capacitor or coil must be replaced.
Overspeed or Underspeed Shutdown
Cause: Frequency setting incorrect
Fix: Disconnect all loads and restart unit. Read frequency (Hz) in the LCD window on controller. Frequency should read 60 Hz. If frequency is above 60 Hz, engine speed will need to be adjusted. Refer to the engine operator’s manual for throttle adjustment information.

Compiled from service & troubleshooting documentation across every generator set that uses the Kubota D1005.

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter			—
Fuel filter	Lubricate new element and gasket; fill element with clean diesel fuel; hand tighten		—	500 hr
Oil filter	Full flow, spin-on type		7665025430	1000 hr	Amazon eBay $22.12 PartsGeek $7.98 NAPA $13.30
Battery	12 volts, minimum CCA 360 amps (MDKAL) or 500 amps (MDKAA/MDKAB); specific gravity of fully charged battery approx. 1.260 at 80 F (27 C)		—	100 hr
Belt	Deflection 0.4 inch (10 mm) at 20 pounds (10 kg) applied mid-span		—	800 hr
Coolant	Ethylene or propylene glycol antifreeze, fully formulated with rust inhibitors and coolant stabilizers, no stop-leak; 50/50 mixture good for -34 F (-37 C)	3.78	—	800 hr
Coolant filter			—
Oil	API Class CG-4, CF-4, CF or better; SAE 15W-40 multi-grade recommended for year-round use	4.25	—	100 hr
Spark plug			—

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

Service intervals

Item	Action	Hours	Months	Notes
Light tower winch	Inspect			Check daily for proper operation
Radiator fins	Inspect			Inspect daily for debris
Battery condition	Inspect	1 hr		Mitsubishi schedule
Coolant level	Check	8 hr		Keep recovery tank between COLD and HOT
Electrical connections	Check	8 hr		Daily or before use
Exhaust system	Check	8 hr		Every time genset is started and every 8 hours if run continuously
Fuel level	Check	8 hr		Daily or before use
Generator set (exhaust, fuel, DC electrical and mechanical inspection)	Inspect	8 hr		Inspect daily or after every eight hours of operation, whichever comes first.
Genset	Inspect	8 hr		Check for oil, fuel, coolant and exhaust system leaks; every time started or every 8 hrs if run continuously
Oil level	Check	8 hr		Keep between FULL and ADD on dipstick
Tire pressure	Check	8 hr		Daily or before use
Engine oil and filter	Change	35 hr		First service — Table 4 footnote 2 / Break-In Procedure: Perform after first 35 hours of operation on new genset (drain crankcase and refill with new oil).
Oil & Oil Filter	Change	200 hr	6 mo	First service — After first 35 hours (break-in)
Oil and oil filter	Change	100 hr	1 mo	First service — After first 35 hours (engine break-in)
Air cleaner	Check	250 hr		First service — Mitsubishi maintenance schedule
Bolts and nuts on engine	Adjust	50 hr		First service — Mitsubishi: retighten after initial 50 hours.
Engine bolts and nuts	Adjust	50 hr		First service — Mitsubishi after first 50 hours
Engine oil and oil filter	Change	50 hr		First service — Change after the initial 50 hours of operation, then at the appropriate regularly scheduled interval thereafter
Engine oil and oil filter	Replace	250 hr		First service — Perform after initial 50 hours, then on regularly scheduled interval.
Fuel Tank - Water	Drain	50 hr		MLT3060MV Mitsubishi schedule
Replace engine oil and oil filter	Change	50 hr		First service — Mitsubishi engine, after initial 50 hours, then at regular interval thereafter
Water Separator	Drain	50 hr		MLT3060KV / MLT3080KV Kubota schedule
Battery	Check	100 hr	1 mo	See battery manufacturer's recommendations
Fan Belt Tightness	Check	100 hr		MLT3060KV / MLT3080KV Kubota schedule
Fuel Filter	Clean	100 hr		MLT3060KV / MLT3080KV Kubota schedule
Genset	Clean	100 hr	1 mo	Do not clean while running
Intake Air Line	Check	100 hr		MLT3060KV / MLT3080KV Kubota schedule
V-belt tension	Check	100 hr	1 mo	Check for slippage
Water and sediment in fuel filter	Drain	100 hr	1 mo	About 1/2 cup (120 ml)
Water in Fuel	Drain	100 hr	1 mo
Engine Oil	Change	200 hr		First service — MLT3060KV / MLT3080KV Kubota schedule - * change after initial 50 hours, then at appropriate interval
Fuel Filter Cartridge	Replace	200 hr		MLT3060KV / MLT3080KV Kubota schedule
Fuel Pipes And Clamp Bands	Check	200 hr		MLT3060KV / MLT3080KV Kubota schedule
Fuel Tank Sediment	Clean	200 hr		MLT3060KV / MLT3080KV Kubota schedule - remove sediment
Oil Filter Cartridge	Replace	200 hr		First service — MLT3060KV / MLT3080KV Kubota schedule - * after initial 50 hours
Radiator Hoses And Clamp Bands	Check	200 hr		MLT3060KV / MLT3080KV Kubota schedule
Siphon break	Check	200 hr	6 mo	Check plunger free movement or vent hose connections
Water Separator	Clean	200 hr		MLT3060KV / MLT3080KV Kubota schedule
Zinc Anode	Change	500 hr	12 mo
Engine Starting Battery	Inspect	250 hr		MLT3060MV Mitsubishi schedule

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Service specifications

Type	Item	Value	Unit	Condition
Clearance	Exhaust hose minimum downgrade (manifold to through-hull outlet)	1/2	inch per linear foot (42 mm/m)	no uphill section between manifold and muffler permitted
Clearance	Maximum vertical rise of exhaust hose exiting the muffler	48	inches (1.2 m)	measured from bottom of muffler to peak
Clearance	Minimum vertical distance between engine exhaust manifold outlet and muffler inlet	12	inches (305 mm)
Clearance	Minimum vertical drop from exhaust hose peak to through-hull outlet fitting	12	inches (305 mm)
Clearance	Pump belt tension (deflection at middle of belt)	22 pounds (10 kg) finger pressure gives about 0.4 inch (10 mm) deflection	lb (kg) / inch (mm)	genset stopped, belt guard removed
Clearance	V-belt deflection	0.4 inch (10 mm)	inch (mm)	20 pounds (10 kg) applied mid-span
Clearance	Valve Lash (cold)	0.0071 - 0.0087	inch (0.18 - 0.22 mm)	cold
Injection timing	Fuel injection timing	15.5 - 17.5	degrees BTDC
Other	Battery electrolyte specific gravity	1.260	specific gravity	at 80 F (27 C); charge if less than 1.215
Other	Battery specific gravity, fully charged	approximately 1.260	specific gravity	at 80 F (27 C)
Other	Compression Ratio	22:1
Other	Frequency regulation, no load to rated load	5	percent (± 1.5 Hz @ 50-60 Hz)
Other	Frequency regulation, no load to rated load	5 percent (1.5 Hz @ 50/60 Hz)	percent (Hz)	no load to rated load
Other	Fuel cetane number / sulfur content	not less than 45 cetane; not more than 0.5 percent sulfur by weight	cetane number; percent	No. 2 diesel fuel ASTM 2-D
Other	Fuel pump self-priming lift capacity	4	ft. (1.2 m)	fuel inlet height above tank
Other	Load Bank Resistor resistance	30	Ohm ± 10%
Other	Maximum cranking time	20 seconds, then wait 2 minutes	seconds	starter will overheat if exceeded
Other	Minimum compartment air opening (inlet and outlet)	35	in2 (225.8 cm2)
Other	Preheat time (control switch in STOP/PREHEAT)	5 to 20	seconds	preheat longer than 20 seconds can damage glow plugs
Other	Sea water lift capability (water line to pump inlet)	4	ft. (1.2 m)	pump impeller must be wet at initial startup
Other	Siphon break mounting height above load-waterline	12	inches (305 mm) minimum	vertical position required, remote mounting within 5 ft (1.5 m) radius of injection port
Other	Torque of high-pressure fuel line fittings at nozzles	see Engine Service Manual (Onan publication 981-0517)		after bleeding high pressure fuel system
Pressure	Compressed air cleaning pressure (cabinet interior)	less than 40 PSI (276 kPa)	PSI (kPa)
Pressure	Cooling system pressure cap rating	7 psi (48 kPa)	psi (kPa)
Pressure	Engine oil pressure	28 - 64 psi (194 - 442 kPa)	psi (kPa)	normal operating temperature
Pressure	Engine oil pressure (at operating temperature)	28 to 64 psi (194 to 442 kPa)	psi (kPa)	engine at operating temperature
Pressure	Engine oil pressure, normal operating	35-80	psi (241-552 kPa)	engine running
Pressure	Exhaust back pressure (maximum)	3.0	inches (76 mm) of mercury (10 kPa)	check if exhaust run is more than 30 feet (9 m) overall
Pressure	Fuel pump static pressure	3.5 - 6 psi (24 - 41 kPa)	psi (kPa)	measured at pump outlet with 0-15 psi gauge
Pressure	Low oil pressure shutdown	14	psi (97 kPa)
Pressure	Low oil pressure shutdown set point	14 psi (97 kPa)	psi (kPa)	shutdown occurs when pressure falls below
Pressure	Low oil pressure switch actuation	14 psi (97 kPa)	psi (kPa)	fault circuit actuated when pressure drops below this value
Pressure	Maximum back pressure at injector fuel return line fitting	15	psi (103 kPa)
Pressure	Normal engine oil pressure	28 - 64	psi (194 - 442 kPa)	normal operating temperature
Resistance	Exciter rotor winding resistance	0.58 - 0.71	ohms	room temperature
Resistance	Exciter stator winding resistance	13 - 16	ohms	room temperature
Resistance	Main rotor winding resistance (341 mm reference length)	2.60 - 3.20	ohms	room temperature
Resistance	Main rotor winding resistance (378 mm reference length)	2.17 - 2.65	ohms	room temperature
Resistance	Main winding resistance, 12-lead three-phase, reference length 341 mm (13.4 in)	0.36 - 0.44	ohms	windings at room temperature
Resistance	Main winding resistance, 12-lead three-phase, reference length 378 mm (14.9 in)	0.15 - 0.19	ohms	windings at room temperature
Resistance	Main winding resistance, 4-lead single-phase, reference length 341 mm (13.4 in)	0.17 - 0.22	ohms	windings at room temperature
Resistance	Main winding resistance, 4-lead single-phase, reference length 378 mm (14.9 in)	0.09 - 0.12	ohms	windings at room temperature
Resistance	Polarization index	at least 2	ratio	10-minute reading divided by 1-minute reading
Resistance	Quadrature winding resistance, 12-lead three-phase, reference length 341 mm (13.4 in)	2.32 - 2.83	ohms	windings at room temperature
Resistance	Quadrature winding resistance, 12-lead three-phase, reference length 378 mm (14.9 in)	1.83 - 2.23	ohms	windings at room temperature
Resistance	Quadrature winding resistance, 4-lead single-phase, reference length 341 mm (13.4 in)	1.33 - 1.63	ohms	windings at room temperature
Resistance	Quadrature winding resistance, 4-lead single-phase, reference length 378 mm (14.9 in)	0.79 - 0.97	ohms	windings at room temperature
Resistance	Winding insulation resistance, in-service set	not less than 1	megohm	in service
Resistance	Winding insulation resistance, new generator	at least 5	megohms	dry windings
Speed	AVR overspeed cutout when AVR set at 50 Hz	approximately 64	Hz	60 Hz genset with AVR set at 50 Hz
Speed	Engine operating speed	1,800	rpm
Speed	Engine operating speed	1800	rpm
Speed	Engine speed / frequency rating basis	1800	rpm (1500 rpm also listed for 50 Hz air-flow data)
Speed	No-load frequency, 50 Hz setting	52.5	Hz	no load
Speed	No-load frequency, 60 Hz setting	63	Hz	no load
Speed	Operating Speed	1800	rpm
Speed	Overspeed shutdown setting	74 Hz at 60 Hz setting; 64 Hz at 50 Hz setting	Hz	AVR monitored
Temperature	Coolant temperature	160 to 195 F (71 to 91 C)	F (C)	depending on load and sea water temperature
Temperature	Coolant temperature shutdown	210	°F (99°C)
Temperature	Coolant temperature shutdown limit	210	°F (99°C)

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Recommended fluids

Fluid	Grade	Standard	Ambient	Capacity	Notes
Coolant	50% glycol, 50% water		below 49°C		Standard mixture; 60/40 and heated options available for cold weather
Coolant	50% glycol, 50% water or 60% glycol, 40% water		below 49°C		Liquid cooled engines with standard 50/50 mixture or optional cold-weather 60/40 configuration
Coolant	50-50 mixture of coolant (ethylene glycol or propylene glycol) and distilled water			3.78 L (4 qt)	Do not exceed a 50-50 mixture; contains rust inhibitors
Coolant	50/50 glycol/water or 60/40		below 49°C		Liquid cooled diesel engines
Coolant	50/50 mixture of ethylene glycol anti-freeze and water	Reliable brand anti-freeze containing rust and corrosion inhibitor; no stop-leak additive; use distilled or soft water	above -37°C	3.78 l	4 qt (3.78 L). A 50/50 mixture provides freeze protection to -34 F (-37 C). Do not deviate from a 50/50 mixture.
Coolant	50/50 mixture of water and ethylene glycol (ethylene or propylene glycol antifreeze with rust inhibitors and coolant stabilizers; no stop-leak)		above -37°C		50/50 mixture good for -34 F (-37 C); coolant capacity 4.2 quart (4.0 liter) MDKAL, 5.3 quart (5.0 liter) MDKAA/MDKAB; use distilled water
Coolant	40% water / 60% antifreeze		above -36°C		Freezing point -34°F (-36°C); maximum freeze protection is 60% antifreeze
Coolant	50% water / 50% antifreeze		above -24°C		Freezing point -12°F (-24°C); mix demineralized/distilled water with coolant, not hard water
Coolant	50/50 ethylene or propylene glycol antifreeze and water		above 37°C		Good for -34F (-37C); fully formulated with rust inhibitors, no stop-leak additives
Engine oil	SAE 0W-20 Synthetic		below -18°C		For use below -0°F / -18°C
Engine oil	SAE 10W				From engine oil viscosity chart decal
Engine oil	SAE 15W-40				From engine oil viscosity chart decal
Engine oil	SAE 15W-40 (year-round)	API CG-4, CF-4, CF or better			See viscosity grade chart vs ambient temperature
Engine oil	SAE 15W-40 multi-grade recommended for year-round use	API Class CG-4, CF-4, CF or better			Choose viscosity grade per Figure 2 ambient temperature chart; capacities: MDKAL Spec A 4.5 quart (4.3 liter), MDKAL Spec B 4.2 quart (4.0 liter), MDKAA/MDKAB 4.5 quart (4.3 liter)
Engine oil	SAE 30W				From engine oil viscosity chart decal
Engine oil	SAE 40W				From engine oil viscosity chart decal
Engine oil	SAE viscosity per Table 1 (Oil Viscosity vs. Temperature); select viscosity right for the lowest expected ambient temperature	API CG-4, CF-4, CD/SG or CE/SG; do not use synthetic or non-detergent oil	-34°C to 48°C	4.25 l	4.5 qt (4.25 L) including filter. Table 1 covers -30 F to 120 F (-34 C to 49 C) anticipated ambient temperature. If adding oil between changes use the same brand.
Fuel	ASTM 2-D (No. 2 Diesel) or ASTM 1-D (No. 1 Diesel), minimum Cetane number 45	Low sulfur content fuel with a cloud point at least 10 degrees below the lowest expected fuel temperature	below 0°C		No. 2 diesel gives best economy and performance under most conditions. Use No. 1 diesel when ambient temperatures are below 32 F (0 C) and during long periods of light engine load. Engine is certified to operate on diesel fuel.
Fuel	Diesel			33.8 gal (L)	Fuel Tank—Total 33.8 gal (128 L); usable 33.6 gal (127 L)
Fuel	No. 2 diesel (ASTM 2-D), Cetane 45 min, sulfur max 0.5% by weight	ASTM 2-D			Use fuel with cloud point at least 10 degrees below lowest expected fuel temperature in cold climates
Fuel	No. 2 diesel fuel				Basis for fuel consumption data
Fuel	No. 2 diesel fuel (ASTM 2-D)	ASTM 2-D			Cetane number not less than 45; sulfur not more than 0.5 percent by weight; cloud point at least 10 degrees below lowest expected fuel temperature
Fuel	No. 2D diesel (above freezing) / No. 1D diesel (at or below freezing); climatized 1D/2D mix also usable in some areas	Ultra-low-sulfur diesel only			Do NOT use home heating oil or bio-diesel fuel
Fuel	Ultra-low-sulfur diesel No. 1D or No. 2D				No. 1D when at or below freezing; No. 2D when above freezing; climatized fuel acceptable
Fuel	Ultra-low-sulfur diesel; No. 1D below freezing, No. 2D above freezing (climatized 1D/2D blend acceptable in some areas)			216.0 L	DO NOT use home heating oil or bio-diesel fuel
Grease	High quality grease for wheel bearings				Use high quality grease made specifically for lubrication of wheel bearings.
Other	Automotive grease / lightweight oil				For jack maintenance: automotive grease for internal gearing; lightweight oil for handle unit and caster axle.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

Adjusting V-Belt Tension adjustment

⚠ Accidental starting can cause severe personal injury or death.

Disconnect negative battery cable(s) and remove belt guard or sound shield door.
Loosen alternator pivot bolt first, then adjusting bracket bolt on top.
Pivot alternator outwards to tighten belt; hold tension and tighten bracket bolt.
Apply 20 pounds (10 kg) mid-span and measure deflection 0.4 inch (10 mm).
Tighten alternator bolts when tension is correct.
Secure belt guard or sound shield door and reconnect battery cables (negative last).

Adjusting Voltage (AVR) adjustment

⚠ HAZARDOUS VOLTAGE: touching uninsulated live parts can cause severe personal injury or death.

Tools: Insulated tools

Disconnect all generator loads.
Check 50/60 Hz selector switch position and change if necessary.
Start genset and turn voltage adjusting pot to obtain rated output voltage.
Check and readjust frequency.
Readjust voltage if frequency was changed.

Pump Belt Adjustment adjustment

⚠ Accidental starting of the generator set can cause severe personal injury or death; stop the set and disconnect battery cables before maintenance.

⚠ Operation with too much tension on the pump belt may cause reduced belt life; do not overtighten.

Disable the genset by removing the battery cables, negative (-) cable first.
Open the genset service door; on sets without sound shields remove the belt guard.
Loosen the bottom pivot bolt on the alternator.
Loosen the bolt that passes through the long slot in the alternator mounting bracket.
Slide the alternator until the tension is right.
Do not operate the genset without the belt guard in place.

Voltage Adjustment Procedure (Set Not Running) adjustment

⚠ High voltages within the control cabinet can cause severe personal injury or death.

Tools: non-conductive trimpot adjustment tool

Stop the generator set.
Open the control box.
Adjust the trimmer pot a small increment up or down as needed.
Close the control box, start the set and check output voltage.
Repeat starting/stopping and adjusting until output voltage is correct.

Voltage Adjustment Procedure (Set Running) adjustment

⚠ Lethal voltages are present inside the control box.

⚠ Do not wear jewelry or damp clothing; stand on a dry wooden platform or rubber mat.

Tools: voltmeter, non-conductive screwdriver or trimpot adjustment tool

Connect a voltmeter to the set output.
Start the set.
Adjust the trimmer pot to the desired voltage.

Flashing the Field diagnostic

Tools: AVR/generator test adapter, 6 volt dry cell battery

Disconnect P1/J1 inside the control box.
Connect test adapter and 6 volt dry cell battery for a few seconds.
Connect B+ to F1 (P1-8) and B- to F2 (P1-1).
Reconnect P1/J1.
See Troubleshooting if flashing the field does not restore voltage.

Test the PAS diagnostic

Pull the T-handle (valve must be open before testing) OR press the emergency stop button
Confirm valve closed by verifying knob rotated perpendicular to pipe centerline

Testing AVR vs Generator diagnostic

⚠ HAZARDOUS VOLTAGE: use insulated tools and dry clothing.

Tools: AVR/generator test adapter, 6 volt dry cell battery

Disconnect all generator loads.
Disconnect P1/J1 and connect test adapter and 6 volt dry cell battery.
Start genset and close terminal K4-5 to ground to keep it running.
Measure voltage across test terminals.
If AVR connections good and output 100-140 VAC across Q1-S2 and 130-150 VAC across Q1-Q2, replace AVR.

Fuel System Test installation

⚠ Fuel leakage presents fire and explosion hazards.

After installation, test the fuel system for tightness per USCG specification 33CFR183.542.
Find and correct any leak before putting the fuel system into service.

Installing Coolant Recovery Tank installation

Use the bracket as a template to locate mounting holes.
Allow at least 2 inches (51 mm) from tank top to any upper structure.
Use hose from kit between engine overflow and tank connector.
Route drain tube end to the drip pan to avoid coolant spills to bilge.
Locate tank so hose is pitched slightly downward.

Light Tower Set Up installation

⚠ The mast extends up to 25 ft (7.6 m). Make sure area above the unit is open and clear of overhead wires and obstructions.

For maximum light coverage, locate the unit at ground level or higher than the area being illuminated.
Place the unit on firm, relatively flat ground, then block the wheels to keep it from moving.
Pull the tongue jack locking pin, rotate the jack 90 degrees, replace the pin and raise the trailer tongue off the towing vehicle.
Connect a good earthen ground to the grounding stud on the frame near the trailer tongue.
Pull each outrigger out until the spring loaded locking pin snaps into place; rotate jacks 90 degrees pad down.
Pull the rear jack locking pin and rotate 90 degrees; level all four jacks until firmly in contact with the ground.
Before raising the mast, adjust lamps using the wing nuts on the trunnion, aim, then tighten hardware.

Light Tower Setup installation

⚠ Verify area above unit is clear of overhead wires and obstructions.

⚠ Do not set up the unit if high winds are expected.

Position unit at ground level or higher than the area to be illuminated.
Place unit on firm, relatively flat ground (less than 5° slope); block the wheels.
Pull tongue jack locking pin, rotate jack 90°, install pin, raise trailer tongue.
Ground the unit per NEC, state, and local regulations.
Pull outrigger locking pins, extend outriggers until spring loaded pin snaps; rotate jacks down.
Pull rear jack locking pin and rotate 90° until pin snaps into place.
Adjust all four jacks clockwise until pads firmly contact the ground.
Adjust lamps: loosen trunnion wing nuts, aim, then tighten hardware.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Voltage reconnection

Voltage	Phase	Connection	Leads	Notes
110/120 VAC	1	Load leads connected to the circuit breakers in the control box; output taken from two generator windings	L1, L2, L3 (see Figure 8-9 and schematic 612-6713)	Load should be balanced across the windings; full load from one winding can cause poor voltage regulation and damage
120/240	1	AC distribution	From generator to main circuit breaker (40A) to lights and auxiliary outlets	Voltage regulation: Capacitor +/-6%
220/240 VAC	1	Load leads connected to the circuit breakers in the control box; output taken from two generator windings	L1, L2, L3 (see Figure 8-9 and schematic 612-6713)	Generator is 4-wire reconnectible (1-phase) or 12-wire reconnectible (3-phase)

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Parts cataloged across the Kubota D1005 family

Part #	Description	Category
185-6934	V-Belt	Belt
149-2106	Fuel Filter	Fuel filter
300-1500	Fuel Filter	Fuel filter
M1679-2	TWO F U E L LINES IN TANK FITTING	Fuel line
185-5421	Plug, Glow	Glow plug
185-7268	Glow Plug (24 Volt)	Glow plug
132-0375	Sea Water Pump Impeller kit w/cover & gasket	Impeller
132-0379	Sea Water Pump Impeller	Impeller
65004	SIDE LIGHT	Light
65011	SIDE LIGHT	Light
65078	SIDE LIGHT	Light
65381	SIDE LIGHT	Light
185-5835	Oil Filter	Oil filter
324-1491	Oil Filter	Oil filter
100-3478-02	Cruise Kit	Service part / kit
10222	Plug, 3 wire	Service part / kit
130-4434	Zinc Pencil	Service part / kit
13498	SERVICE LOG	Service part / kit
185-6721	Element, Breather	Service part / kit
65003	Coil Insulator	Service part / kit
65012	TRAILER PLUG	Service part / kit
CS1312-1	CROSS-SECTION VIEW HULL STRAINER SEA COCK RECOMMENDED WATER STRAINER OR FILTER FLUSH THROUGH-HULL FITTING TO GENSET	Service part / kit
KB03MAN2	Kubota Workshop Manual	Service part / kit
W10441170	D1005-E3B, D1105-E3B, D1105-T-E3B	Service part / kit
324-1542	Fuel Injection Pump	Pump
612-6673	Water Pump	Pump
323-1544	Thermostat	Thermostat

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Aftermarket parts that fit this engine

16285-52032 Amazon eBay KuduParts $20.59 FridayParts $25.89 SinoCMP $79.00 RTV1140 FridayParts $11.00 16251-73034 Amazon eBay $45.00 FridayParts $42.60 16251-73032 FridayParts $42.60 ZD331 FridayParts $9.90 69mm FridayParts $46.99 16241-73034 FridayParts $46.99 SinoCMP $109.00 16251-73030 FridayParts $42.60 17208-60010 FridayParts $54.30 17208-60015 SinoCMP $49.00 FridayParts $54.30 17208-60016 FridayParts $54.30 17208-60017 FridayParts $54.30 60mm FridayParts $12.94 15521-23530 Amazon eBay FridayParts $68.25 19202-23540 Amazon eBay $34.99 FridayParts $68.25 6A320-59210 FridayParts $98.54 LRS02300 FridayParts $98.54 3Pcs FridayParts $9.90 SinoCMP $36.00 6687911 FridayParts $49.91 6687909 FridayParts $49.91 16032-53000 Amazon eBay SinoCMP $45.00 FridayParts $49.92 16032-53001 FridayParts $49.92 16032-53900 Amazon eBay FridayParts $49.93 6672429 FridayParts $44.48 6680278 FridayParts $44.48 6667453 FridayParts $99.99 6687906 FridayParts $50.58 6674172 KuduParts $14.00 FridayParts $17.75 16604-52030 FridayParts $34.65 16851-52030 FridayParts $18.95 R1401-51352 FridayParts $18.95 R1401-51350 FridayParts $18.85 16032-53902 SinoCMP $45.00 FridayParts $66.00 1G677-53900 FridayParts $89.90 1G677-53902 FridayParts $89.90 1G677-53903 SinoCMP $75.00 FridayParts $89.90 RA211-51280 Amazon eBay KuduParts $9.00 FridayParts $10.99 6969775 FridayParts $10.20 6652576 FridayParts $10.20 17213-12310 Amazon eBay $131.03 FridayParts $199.99 17213-12312 FridayParts $199.99 1E013-63590 FridayParts $20.51 183827 FridayParts $20.51 722D FridayParts $20.51 930D2 FridayParts $20.51 16271-43560 Amazon eBay $18.89 NAPA $16.83 KuduParts $24.00 FridayParts $26.17 1G065-53002 FridayParts $68.99 1G065-53900 FridayParts $68.99 SinoCMP $79.00 1G065-53902 FridayParts $68.99 16261-53001 FridayParts $99.99 16261-53011 FridayParts $99.99 16032-51013 SinoCMP $369.00 FridayParts $499.01 16261-42502 Amazon eBay $12.00 KuduParts $21.00 FridayParts $23.09 16241-35070 Amazon eBay $89.01 FridayParts $102.95 15841-32431 Amazon eBay $17.99 PartsGeek $10.97 FridayParts $20.00 16241-65511 FridayParts $15.99 16241-65510 FridayParts $15.99 16265-12312 FridayParts $99.99 1G700-12310 FridayParts $95.50 SinoCMP $169.00 1K591-12310 FridayParts $95.50

Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.

Filters for this engine

Air filter: Kubota K318182240 Kubota K318182250 Donaldson P778979 Donaldson P780018 Wix 49978 Wix 49968
Oil filter: Kubota 7665025430 Donaldson P550162 Wix 51334 Ac Delco X45 Baldwin B179

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

Also used in

Bobcat 463 — Skid Steer Loader
Bobcat S300 — Skid Steer Loader
Bobcat S70 — Skid Steer Loader
Kubota B21 — Tractor
Kubota B2100 — Tractor
Kubota B2100DT — Tractor
Kubota B2100HST-D — Tractor
Kubota B2100HST-DB — Tractor
Kubota BX2660 — Tractor
Kubota BX2670 — Tractor
Kubota F2260-R — Mower
Kubota F2560E — Mower

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.

Common questions

What is the oil capacity of the Kubota D1005?

The Kubota D1005 engine has an oil capacity of 4.25 liters.

What is the displacement of the Kubota D1005?

The Kubota D1005 has a displacement of 1.001 liters with 3 cylinders.

Which generators use the Kubota D1005 engine?

The Kubota D1005 powers 6 generator set(s), including Cummins/Onan MDKAL, Generac MLT3060K, Generac MLT4060, Generac MLT4060KVLED, Generac MLT6.

What oil filter does the Kubota D1005 use?

The Kubota D1005 uses oil filter part numbers Kubota 7665025430, Donaldson P550162, Wix 51334.

What air filter does the Kubota D1005 use?

The Kubota D1005 uses air filter part numbers Kubota K318182240, Kubota K318182250, Donaldson P778979.

How often should you change the oil in the Kubota D1005?

The Kubota D1005 oil change interval is every 100 hours.

What is a common problem with the Kubota D1005 engine?

A commonly reported issue on generators using the Kubota D1005 is: Oil pressure switch failure. Fix: Refer to OEM engine operator’s manual to identify corrective action..