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Kubota V1305 Engine

The Kubota V1305 is a 1.33 L 4-cylinder 4-stroke cycle, indirect injection, water cooled diesel engine rated at 3000 rpm, producing up to 19.3 kW. It powers generator sets from Cummins/Onan and Kubota, including the MDKAA, MDKAW, MDKB and 4318. It holds 4.3 L (1.1 gal) of oil and 5 L (1.3 gal) of coolant.

Also known as: Kubota V1305

Part of the Kubota V1305 engine family — 3 variants share parts & fitment.

1.335 L

Displacement

Cylinders

3000 rpm

Rated speed

19 kW

Gross power

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

Service parts for the V1305

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

Air intake

1 required

K318182240Air filterfind

Fuel system

1 required

1522143081Fuel filter$37.58eBay

Oil system

1 required

1584132431Oil filter$10.97PartsGeek

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

Engine specifications

Oil capacity	4.3 L
Coolant capacity	5.0 L
Displacement	1.335 L
Cylinders	4
Aspiration	4-Stroke Cycle, Indirect Injection, Water Cooled Diesel
Rated speed	3000 rpm
Gross power	19 kW

Generator sets powered by this engine

Shared across brands: Cummins/Onan, Kubota

Cummins/Onan MDKAA Cummins/Onan MDKAW Cummins/Onan MDKB Kubota 4318 Kubota J 310

How to read your Kubota engine serial & model number →

Common problems

Engine does not crank from genset panel
Cause: Tripped DC Circuit Breaker CB1
Fix: Push ON to reset (p. 25); If the breaker trips again, reconnect the glow plug lead if loose and touching ground (p. 24)
Starter engages-disengages (battery voltage dips below 6 volts while cranking—low battery charge, poor connections, long cables)
Cause: Battery voltage dips below 6 volts while cranking—low battery charge, poor connections, long cables
Fix: Clean and tighten the positive (+) and negative (-) battery cable connections at the battery and genset (Page 3-6); Recharge or replace the battery. Refer to the battery manufacturer's recommendations; Increase battery cable size or run parallel cables
Engine does not crank from remote panel
Cause: Tripped DC Circuit Breaker CB1
Fix: Push ON to reset (p. 25); If the breaker trips again, reconnect the glow plug lead if loose and touching ground (p. 24)
Engine cranks but does not start
Cause: Blocked or restricted fuel supply
Fix: Open any closed shutoff valve; Check fuel level and refill as necessary; Prime the fuel system (p. 24); Check for fuel (air) leaks at all fittings and tighten as necessary; Replace the fuel filter (p. 23) and any other filter in the fuel supply system; Disconnect the two leads to the fuel pump (p. 26) and check for B+ at the red lead while cranking and for ground continuity at the black lead. If there is no B+ at the red lead, check for and reconnect or repair wiring between run relay K3 terminal 87 and engine harness connector pin J5-3. Repair or replace the black lead if there is no ground continuity. If there is B+ and ground continuity, go to Step g; Check for fuel pump operation by priming with the low pressure bleed open (p. 24). Replace the fuel pump (p. 26) if it does not pump; Check fuel pump (p. 26) static pressure by connecting a 0-15 psi (0-100 kPa) gauge at the outlet. Replace the pump if fuel pressure does not stabilize at 3.5-6 psi (24-41 kPa)
LOW OIL PRESSURE 2
Fix: Add engine oil or drain excess oil, as necessary (Page 14).
Unstable output voltage
Cause: Improper AVR selector position (50 Hz gensets)
Fix: Check whether the 50/60 Hz selector switch (p. 28) is at 60 Hz and set it to 50 Hz. Readjust frequency (p. 37 or 38). (Because frequency is below 60 Hz, the AVR will attempt to “unload” the engine by reducing voltage.)
Output voltage too high or too low
Cause: Improper voltage adjustment
Fix: Readjust voltage (p. 28)
Engine unstable or lacks power
Cause: Air leaks or fuel restriction
Fix: Check for fuel (air) leaks at all fittings and tighten as necessary; Replace the fuel filter (p. 23) and any other filter in the fuel supply system; Check fuel pump (p. 26) static pressure by connecting a 0-15 psi (0-100 kPa) gauge at the outlet. Replace the pump if fuel pressure does not stabilize at 3.5-6 psi (24-41 kPa)
UNDERVOLTAGE 13
Fix: Reduce the number of connected appliances, especially when air conditioners and battery chargers are running.
OVERVOLTAGE 12
Fix: See an authorized Onan dealer.
OVERCRANK 4
Fix: 1. Check the fuel tank and fill as necessary. (Note: The arrangement of pickup tubes in the fuel supply tank probably is such that the genset will run out of fuel before the propulsion engines.) 2. Open any closed fuel valves. 3. Remove any blockage in the combustion air inlet (front grille) or exhaust system. 4. Tighten loose fuel line fittings so that air cannot be drawn in by genset lift pump suction. 5. Drain and/or replace the fuel filter (Page 16) and prime the fuel system (Page 8). 6. Drain and/or replace fuel supply system filters and prime the fuel system (Page 8).
LOSS OF RAW WATER FLOW 7
Fix: 1. Open the sea cock. 2. Close the sea cock and clean the sea water strainer. If the strainer is above the water line, fill it with water to assist priming. Secure the strainer cover and reopen the sea cock. 3. Reconnect or replace any disconnected or leaking raw water hoses (Page 19). 4. Remove any blockage from the strainer on the through-hull fitting on the bottom side of the hull. 5. Replace the raw water impeller (Page 23).
HIGH ENGINE TEMPERATURE 1
Fix: 1. Add coolant as necessary and repair leaks (Page 18). 2. Replace the engine thermostat, which might not be opening fully (Page 21). 3. Clean the raw water tubes in the heat exchanger, which might be clogged with scale (Page 22). 4. Flush the coolant system to remove coolant passage fouling (Page 18).
“Check Engine” fault shutdown
Cause: High exhaust temperature (check whether exhaust hose feels hotter than usual)
Fix: Open the sea cock; Remove blockage in the sea water strainer; Prime the sea water pump (p. 22); Replace the sea water pump impeller (p. 22); Clean the heat exchanger (p. 22); Remove blockage covering the sea water hull strainer
No output voltage
Cause: Line circuit breakers OFF
Fix: Find out why the breaker was turned OFF, make sure it is safe to reconnect power and then throw ON the breaker

Compiled from service & troubleshooting documentation across every generator set that uses the Kubota V1305.

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter	N/A		—	500 hr
Fuel filter	N/A		1522143081	500 hr	Amazon eBay $37.58 KuduParts $13.00 FridayParts $15.69
Oil filter	N/A		1584132431	500 hr	Amazon eBay $17.99 PartsGeek $10.97 FridayParts $20.00
Battery	12 V (55 Ah)		—	500 hr
Belt	N/A		—	500 hr
Oil	API CD	5.7 l	—	100 hr

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
Check Engine Oil Level	Check	8 hr
Coolant level	Check	8 hr		Keep recovery tank between COLD and HOT
Drain Water from Fuel Filter	Drain	8 hr
Engine oil level	Check	8 hr		Every Day/8 Hrs (Table 4-1)
Exhaust system	Check	8 hr		Every time genset is started and every 8 hours if run continuously
Exhaust system	Inspect	8 hr		Look over entire exhaust system and listen for leaks every startup and after every eight hours of operation
Fuel Filter	Drain	8 hr
Fuel Filter Water	Drain	8 hr
Fuel Level	Check	8 hr
General Inspection	Check	8 hr		Daily, 8-Hr; includes Oil Level, Coolant Level, Fuel System, Exhaust System, Battery, and Sea Water Strainer Checks.
General Inspection	Inspect	8 hr		Includes inspection of oil level, coolant level, fuel system, exhaust system, batteries and battery connections; before first start of day and after every 8 hours
General Inspection (Oil Level, Coolant Level, Fuel System, Exhaust System, Battery, Sea Water Strainer)	Check	8 hr		Every day, all models (MDKBH, MDKBJ, MDKBW, MDKB & MDKD, MDDCX)
General Inspection (oil, coolant, fuel, exhaust, batteries)	Inspect	8 hr		every day / before first start of the day
Generator Set	Inspect	8 hr		General Inspection; includes oil level, coolant level, fuel system, exhaust system, batteries and sea water strainer.
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
Sea Water Strainer	Clean	8 hr		Clean if necessary and make sure sea cock is open.
Oil and oil filter	Change	100 hr	1 mo	First service — After first 35 hours (engine break-in)
Change Engine Oil and Oil Filter - All except MDKBT & MDKBU	Change	50 hr		First service — after first 50 hrs, then every 200 hrs/year
Change Engine Oil and Oil Filter - Only MDKBT & MDKBU	Change	50 hr		First service — after first 50 hrs, then every 200 hrs/year
Engine Oil and Oil Filter (All except MDKBT & MDKBU) - after first 50 hours	Change	50 hr		First service — Break-in oil change; also change the oil and oil filter after the first 50 hours of operation on a new or re-built engine.
Engine Oil and Oil Filter (Only MDKBT & MDKBU) - after first 50 hours	Change	50 hr		First service
Engine oil and oil filter - all except MDKBT & MDKBU	Change	50 hr		First service — After first 50 hours of operation; then per Table 4-1
Engine oil and oil filter - only MDKBT & MDKBU	Change	50 hr		First service — After first 50 hours of operation; then per Table 4-1
Battery	Check	100 hr	1 mo	See battery manufacturer's recommendations.
Battery and Battery Connections	Inspect	100 hr	1 mo	See battery manufacturer's recommendations.
Check V-Belt Tension	Check	100 hr		check for slippage, cracking and wear
Engine Oil and Oil Filter (All except MDKBT & MDKBU)	Change	100 hr	1 mo	First service — Perform twice as often when using high sulfur fuel.
Fuel Filters	Drain	100 hr	1 mo	Every Month / 100 Hrs
Genset	Clean	100 hr	1 mo	Do not clean while running
Inspect Battery and Battery Connections	Inspect	100 hr		monthly
Siphon Break	Check	500 hr	12 mo	Monthly, 100-Hr
Siphon Break	Inspect	100 hr	1 mo	Every Month / 100 Hrs
Water and sediment in fuel filter	Drain	100 hr	1 mo	About 1/2 cup (120 ml)
Water from Fuel Filter	Drain	100 hr	1 mo	Every Month/100 Hrs
Water in Fuel	Drain	100 hr	1 mo	Every Month/100 Hrs; drain more often if fuel quality is poor or condensation cannot be avoided
Water in Fuel Filter	Drain	100 hr		Every Month / 100 Hrs
Zinc Anode	Inspect	500 hr	1 mo	Replace as recommended.
Zinc Anode	Replace	500 hr	12 mo	Monthly, 100-Hr; Model MDKAU does not have a zinc anode to replace.
Brushes & Slip Rings	Check	200 hr		Yearly, 200 Hrs (MDKBH, MDKBJ, MDKBW only); must be performed by trained mechanic; not applicable to other listed models (—)

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	V-Belt Tension Deflection	0.4	inch (10 mm) @ 20 lbs (10 kg)
Clearance	V-belt deflection	0.4 inch (10 mm)	inch (mm)	20 pounds (10 kg) applied mid-span
Clearance	V-belt deflection	3/8	inch (10 mm) at 20 lbs (10 kg) applied
Clearance	V-belt deflection at 20 lbs (10 kg)	3/8 inch (10 mm)	in (mm)	tension check at middle of pulley span
Clearance	V-belt deflection at middle of pulley span	3/8 inch (10 mm)		with 20 lbs (10 kg) applied
Clearance	Valve Lash (cold)	0.0071 - 0.0087	inch (0.18 - 0.22 mm)	cold
Clearance	Valve Lash (cold) - D1105/V1505/V2003M/V2403M	0.0071-0.0087	in (0.18-0.22 mm)	cold
Clearance	Valve Lash (cold) - V3300-E2B	0.009-0.010	in (0.23-0.27 mm)	cold
Compression	Compression Ratio (MDKAV/MDKAW/MDKAZ)	22:1
Compression	Compression Ratio (MDKBD/MDKBE/MDKBF)	23:1
Gap	V-belt deflection	0.4	inch (10 mm)	20 pounds (10 kg) applied to middle of pulley span
Injection timing	Fuel Injection Timing	12 deg BTDC	deg BTDC
Injection timing	Fuel Injection Timing	13.5-15 deg BTDC	deg BTDC
Injection timing	Fuel Injection Timing	14.25-15.75 deg BTDC	deg BTDC
Injection timing	Fuel Injection Timing	14.75-16.25 deg BTDC	deg BTDC
Injection timing	Fuel Injection Timing	18.25 − 19.75	° BTDC
Injection timing	Fuel Injection Timing	18° – 20°	BTDC
Injection timing	Fuel Injection Timing - D1105	14.75-16.25	° BTDC
Injection timing	Fuel Injection Timing - V1505	14.25-15.75	° BTDC
Injection timing	Fuel Injection Timing - V2003M	13.5-15	° BTDC
Injection timing	Fuel Injection Timing - V2403M	13.5-15	° BTDC
Injection timing	Fuel Injection Timing - V3300-E2B	12	° BTDC
Injection timing	Fuel injection timing	12	degrees BTDC
Injection timing	Fuel injection timing	14.5	degrees BTDC
Injection timing	Fuel injection timing	15.5 - 17.5	degrees BTDC
Injection timing	Fuel injection timing	15.5 - 17.5 degrees BTDC	degrees BTDC
Injection timing	Fuel injection timing	16	degrees BTDC
Injection timing	Fuel injection timing	16.5	degrees BTDC
Injection timing	Fuel injection timing	18 - 20	degrees BTDC	timing marks line up at 19 degrees BTDC
Other	Battery Charging Output	Trickle (3 amps)
Other	Battery cable gauge	1	AWG	total cable length 22 ft (6.7 m); approx. diameter 9.43 mm
Other	Battery cable gauge	1/0	AWG	total cable length 30 ft (9.1 m); approx. diameter 9.46 mm
Other	Battery cable gauge	2	AWG	total cable length 18 ft (5.5 m); approx. diameter 7.42 mm
Other	Battery cable gauge	3	AWG	total cable length 14 ft (4.3 m); approx. diameter 6.61 mm
Other	Battery cable gauge	4	AWG	total cable length 10 ft (3 m); approx. diameter 5.88 mm
Other	Battery specific gravity, fully charged	approximately 1.260	specific gravity	at 80 F (27 C)
Other	Combustion Air	18 CFM (30 M3/HR)
Other	Compression Ratio	22.8:1
Other	Compression Ratio	23.5:1
Other	Compression Ratio	24.3:1
Other	Compression Ratio	24:1
Other	Compression ratio	22.5:1
Other	Compression ratio	22:1
Other	Compression ratio	23:1
Other	Coolant Capacity	2.2 quart (2.1 liter)
Other	Coolant Flow	3.0 gpm (16 liter/min)		50 Hz
Other	Coolant Flow	3.5 gpm (13 liter/min)		60 Hz
Other	Engine Oil Capacity	2.2 quart (2.1 liter)
Other	Firing Order (Clockwise Rotation)	1-2
Other	Firing order (clockwise rotation)	1-2-3
Other	Firing order (clockwise rotation)	1-2-4-3
Other	Firing order (clockwise rotation)	1-3-4-2
Other	Firing order (clockwise rotation)	1-3-5-4-2
Other	Fuel Injection Order (Firing Order, clockwise rotation)	1-2
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 delivery (test)	2/3	liter per minute	prime test, 1 liter container
Other	Fuel pump delivery rate	2/3 liter per minute (1 liter in 1-1/2 minutes)	liter/min	prime mode
Other	Generator Cooling Air	60-80 CFM (100-135 M3/HR)
Other	High AC Frequency shutdown (Code 14)	70 Hz for 40 ms, or 2% over nominal for 6 seconds		after starter engaged
Other	Low AC Frequency shutdown (Code 15)	90	% of nominal for more than 8 seconds	during normal operation

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	50/50 water/ethylene glycol			2.1 L	MDKBH; also stated as 2.2 Qt
Coolant	Fleetguard ES Compleat / EG Premix antifreeze (ethylene glycol based)				Purple coloured viscous liquid; boiling point 107 C, flash point 121 C.
Coolant	Fleetguard ES Compleat and EG Premix (ethylene glycol based)
Coolant	50/50 ethylene glycol/water	ASTM D5345 (prediluted) or ASTM D4985 (concentrated, 40-60% quality water)	above -37°C		Protects to -34°F (-37°C)
Coolant	50/50 ethylene glycol/water mixture	Fully formulated with rust inhibitors and coolant stabilizers	above -37°C	5.0 liter	MDKAW, MDKAZ
Coolant	50/50 mixture of water and ethylene glycol		above -37°C	2.1 liter	Use best quality ethylene glycol antifreeze with rust inhibitors and coolant stabilizers; distilled water best. Protection down to -34°F (-37°C).
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	50/50 mixture of water and ethylene glycol antifreeze	Fully formulated with rust inhibitors and coolant stabilizers; use low-mineral fresh water (distilled best)	above -37°C	4.0 liter	MDKAV, MDKBG; mixture good for -34 F (-37 C)
Coolant	50/50 mixture of water and ethylene glycol antifreeze, fully formulated with rust inhibitors and coolant stabilizers	ASTM D5345 for 50/50 prediluted coolant or ASTM D4985 for concentrated coolant with 40% to 60% quality water	above -37°C		50/50 mixture gives protection from freezing down to -34 F (-37 C); use fresh water low in minerals and corrosive chemicals (distilled best)
Coolant	Ethylene glycol antifreeze, 50/50 mixture of water and ethylene glycol	ASTM D5345 for 50/50 prediluted coolant or ASTM D4985 for concentrated coolant with 40% to 60% quality water	above -37°C		Provides protection from freezing down to -34 F (-37 C). Use fresh water low in minerals; distilled water is best. Fully formulated with rust inhibitors and coolant stabilizers.
Coolant	Ethylene glycol antifreeze, fully formulated with rust inhibitors and coolant stabilizers; 50/50 mixture of water and ethylene glycol		above -37°C	2.1 liter	Protection from freezing down to -34°F (-37°C); use fresh water low in minerals, distilled best
Coolant	ethylene glycol antifreeze, 50/50 mixture with water		above -37°C		Good to -34F (-37C)
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
Coolant	ethylene glycol antifreeze, 50/50 mixture with water for freeze protection to -34°F (-37°C)	ASTM D5345 (50/50 prediluted) or ASTM D4985 (concentrated, 40-60% quality water)	above 37°C		distilled water best
Engine oil	15W40			2.1 L	MDKBH; also stated as 2.2 Qt. Shipped with 15W40 engine oil.
Engine oil	API CH-4 or better, SAE 15W-40 recommended year-round	API/SAE			Synthetic motor oil not recommended
Engine oil	API Service Category CI-4 or better; SAE 15W-40 recommended	API CI-4		2.1 liter	2.2 quart (2.1 liter). Multigrade oils such as SAE 15W-40 are recommended for year-round use.
Engine oil	API Service Category CI-4 or better; SAE 15W-40 recommended year-round	API			choose viscosity per Figure 3-1 ambient chart
Engine oil	Multigrade oils such as SAE 15W-40 recommended for year-round use; choose SAE viscosity grade per ambient temperature (Figure 3-1)	API Service Category CI-4 or better			4.0 L for MDKBK/MDKBL; 4.3 L for MDKBM/MDKBN; 7.6 L for MDKBP/MDKBR; 12 L for MDKBS; 10.4 L for MDKBT/MDKBU
Engine oil	Premium Blue E 15W40			2.1 L (2.2 qt)	Lubricant oil - Premium Blue E 15W40
Engine oil	SAE 10W-30				RM92-8M0086220U6 / RM92-8M0086221U3
Engine oil	SAE 15W-40	API Class CH-4 or better		4.3 liter	MDKAW, MDKAZ
Engine oil	SAE 15W-40 (multi-grade recommended for year-round use)	API CF, CF-4, CG-4, CH-4 or CI-4			Emissions-regulated areas: CF, CF-4, CG-4, CH-4 or CI-4 with low sulfur or ultra low sulfur fuel. Non-regulated areas with high sulfur fuel: CF class recommended; if CF-4/CG-4/CH-4/CI-4 used, change oil and oil filter twice as often.
Engine oil	SAE 15W-40 (multi-grade recommended for year-round use; choose viscosity grade per ambient temperature)	API Performance Class CH-4 or better		4.0 liter	MDKAV, MDKBG; synthetic motor oil not recommended
Engine oil	SAE 15W-40 (multigrade recommended for year-round use); choose viscosity grade for ambient temperature (Figure 3-1)	API Service Category CI-4 or better
Engine oil	SAE 15W-40 (multigrade) recommended for year-round use	API Service Category CI-4 or better		2.1 liter	Choose viscosity grade appropriate for ambient temperatures expected until next scheduled oil change
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 15W-40 multigrade recommended; choose viscosity grade per ambient temperature (Figure 3-1)	API Service Category CI-4 or better			Lube oil capacity: 4.2 quart (4.0 liter) MDKBK/MDKBL; 4.5 quart (4.3 liter) MDKBM/MDKBN; 8 quart (7.6 liter) MDKBP/MDKBR; 12.7 quart (12 liter) MDKBS; 11 quart (10.4 liter) MDKBT/MDKBU. Add 1 quart (0.9 liter) when level falls to ADD mark.
Engine oil	SAE 25W-40				RM92-8M0086227U3 / RM92-8M0086224U3

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

Fault codes

Code	Name	Meaning	Severity	Action
1	High Engine Temperature	Engine coolant temperature exceeded design limit	Shutdown	Add coolant, repair leaks, replace thermostat, clean raw water tubes, flush coolant system
2	Low Oil Pressure	Low oil pressure	Shutdown	Add engine oil or drain excess oil
3	Service Check	Indicates presence of second-level shutdown	Shutdown	Check second-level shutdown code by pressing STOP once
4	Overcrank	Cranking exceeded 20 to 60 seconds without start	Shutdown	Check fuel tank, open valves, remove blockage, tighten fittings, replace fuel filter, prime
5	Warning - Shutdown due to Vessel CO	Dangerous levels of Carbon Monoxide in vessel	Shutdown	Get everyone out into fresh air immediately and seek medical attention
7	Loss of Raw Water Flow	Low raw water pressure in heat exchanger	Shutdown	Open sea cock, clean strainer, reconnect hoses, replace impeller
12	Overvoltage	Controller unable to maintain rated voltage	Shutdown	See an authorized Onan dealer
13	Undervoltage	Controller unable to maintain rated voltage	Shutdown	Reduce number of connected appliances
14	Overfrequency	Engine governor unable to maintain rated frequency	Shutdown	Reset breaker after starting, tighten fuel fittings, prime fuel system
15	Underfrequency	Engine governor unable to maintain rated frequency	Shutdown	Reduce appliances, check fuel, remove blockage, tighten fittings, prime
17	Over-Prime	Prime mode exceeded 5 minutes	Shutdown	Remove object holding control switch in prime position
22	Governor Overload	Maximum allowable time at full-duty cycle exceeded	Shutdown	Reduce appliances, check fuel, remove blockage, tighten fittings, prime
23	Faulty Oil Pressure Sender	Controller sensed grounded sender	Shutdown	See an authorized Onan dealer
24	Faulty Temperature Sender	Controller sensed open sender	Shutdown	See an authorized Onan dealer
27	Loss of Voltage Sense	Controller unable to sense output voltage	Shutdown	See an authorized Onan dealer
29	High Battery Voltage	Battery system at more than 19.2V (12VDC) or 38.4V (24V)	Shutdown	Check battery bank connections, select lower boost charge rate
32	STARTING FAULT	Controller could not detect cranking speed (quadrature zero crossings) for 3 seconds	Shutdown	De-energize PTO, run propulsion engines while starting, service battery connections, change oil viscosity, check starter relay K4, check wiring, service starter motor, service engine, replace controller
35	Control Card Failure	Microprocessor EEPROM error during self-test	Shutdown	See an authorized Onan dealer
36	Engine Stopped	Engine stopped without command by controller	Shutdown	Open fuel valves, check fuel tank, check mechanical damage, remove blockage, prime
37	Invalid Genset Configuration	Controller cannot determine genset operating parameters	Shutdown	See an authorized Onan dealer
38	Field Overload	High field voltage induced by high rotor temperature or low power factor loads	Shutdown	Remove blockages to generator airflow, reduce appliances
41	Grounded Rotor	F+ grounded	Shutdown	See an authorized Onan dealer
42	Processor Failure	Microprocessor ROM error during self-test	Shutdown	See an authorized Onan dealer
43	Processor Failure	Microprocessor RAM error during self-test	Shutdown	See an authorized Onan dealer
45	SPEED SENSE LOST	After start disconnect, controller lost speed sense (quadrature zero crossings) for 0.25 seconds	Shutdown	Check for open/shorted field (P3-7 to P3-8) and quadrature (P3-4 to P3-5) windings, service generator, replace controller
46	Genset Overload	The genset Controller shutdown the genset because engine load exceeded 135 percent of genset rating for 10 seconds	Shutdown	Reduce the number of loads on the genset.
48	Processor Failure	Controller unable to sense field voltage	Shutdown	See an authorized Onan dealer
57	OVERPRIME	A local or remote control switch was held in the Prime position for more than 5 minutes	Shutdown	Remove object holding switch in prime position, replace faulty control switch
58	High Exhaust Temperature	Exhaust temperature exceeded design limits	Shutdown	Reconnect/replace raw water hoses, replace impeller
59	Low Coolant Level	Coolant level low	Shutdown	Add coolant, repair leaks
61	Emergency Shutdown	Genset was shut down by fire suppression system or other external control	Shutdown	Make necessary repairs and reset external control
Code No. 5	Warning - Shutdown due to Vessel CO	Shutdown occurring due to the vessel CO detector	Warning	All status indicator lights in the control circuit will also blink the fault code. See Troubleshooting Chapter of the Operator Manual.
Code No. 61	Emergency Shutdown	Shutdown occurring due to external emergency shutdown device	Shutdown	All status indicator lights in the control circuit will also blink the fault code. See Troubleshooting Chapter of the Operator Manual.

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 Frequency adjustment

Tools: Screwdriver

Remove access cover on left end of genset.
Find leads marked J8 HZ, 60 HZ and 50 HZ in wiring harness.
Connect 60 HZ or 50 HZ lead to J8 HZ as appropriate.
Secure access cover with four screws.

Adjusting High-Idle Speed adjustment

⚠ Keep your hands away from the engine belt and pulleys.

⚠ The actuator could overheat if the battery is left on more than 10 minutes.

⚠ Be prepared to clamp off supply and return fuel lines to stop the engine.

Tools: strobe or injector clamp-on tachometer, 12 volt battery, battery switch

Adjust the speed control lever stop.
Measure engine speed with a strobe or injector clamp-on type tachometer.
Remove the front and top access doors and loosen the front/left side panel assembly for access to the speed adjusting screw.
Disconnect the actuator leads and connect a 12 volt battery to the actuator terminals using a battery switch.
Switch the battery on, start the genset, measure engine speed (rpm) and stop the engine by switching off the battery.
Loosen the lock nuts on the two bottom screws and back out the clamping screw if speed is not between 3300 and 3400 rpm.
To increase speed turn the speed adjusting screw in 1 turn clockwise; to decrease turn it out 1 turn counterclockwise.
Repeat until high-idle speed is between 3300 and 3400 rpm and set the lock nut.
Run the clamping screw in by hand until snug, back it out 1-1/2 turns and set the lock nut.

Adjusting Speed Control Lever Stop adjustment

⚠ Accidental or remote starting can cause severe personal injury; disconnect the negative battery cable.

Remove the front and top access doors and loosen the front/left side panel assembly so it can swing left.
Loosen the stop screw locknut and back the screw out a few turns.
Turn the stop screw in until it just makes contact and set the locknut.

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 Valve Lash adjustment

⚠ Do not use the fuel injection timing marks when adjusting valve lash.

Rotate the engine clockwise (looking from the front) until the intake valve push rod just stops moving down (valve closed).
Turn the engine one half turn more.
Adjust lash for both intake and exhaust valves of that cylinder.
Repeat this procedure for the other cylinder.

Adjusting Voltage adjustment

⚠ Hazardous voltage; touching live parts can cause severe personal injury or death

Tools: Accurate AC voltmeter and frequency meter

Disconnect all generator loads and connect accurate AC volt and frequency meters.
Start genset and let voltage and frequency stabilize 5 to 10 seconds.
Rapidly press control switch to START 6 times within 10 seconds.
Amber lamp blinks once per second to confirm voltage set mode.
To raise voltage, press START and release quickly (about 0.6 volt per step).
To lower voltage, press START and release in approximately 2 seconds.
Normal operation resumes 20 seconds after last adjustment.

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.

Adjusting Voltage Using Control Switch adjustment

Tools: separate voltmeter

Start the genset and let voltage and frequency stabilize for 5 to 10 seconds with all loads disconnected.
Rapidly press START 6 times during the first minute after startup to enter voltage adjust mode.
To adjust voltage up, press and quickly release START (about 0.6 volts per press).
To adjust voltage down, press and hold START for about 2 seconds (about 0.6 volts each press).
Wait about 20 seconds for the amber lamp to stop blinking, then press STOP to save the adjustment.
Restart the genset and check voltage.

Adjusting Voltage Using Digital Display adjustment

Start generator set and let voltage and frequency stabilize 5 to 10 seconds; disconnect all loads.
Rapidly press START 6 times during the first minute after startup to enter voltage adjust mode.
Press and quickly release START to increase voltage approximately 0.6 volts per press.
Press and hold START about 1 second to adjust voltage down.
Wait about 20 seconds for status to change from Volt Adj to Running, then press STOP to save.
Restart the generator set and check voltage; recalibrate AC voltage on the digital display.

Adjusting Voltage Using Optional Digital Display adjustment

Tools: Separate voltmeter

Start the genset and let voltage and frequency stabilize for 5 to 10 seconds; make sure all loads have been disconnected.
Rapidly press START 6 times during the first minute after startup to put the genset controller into voltage adjust mode.
To adjust voltage up, press and quickly release START; voltage increases approximately 0.6 volts each press and release.
To adjust voltage down, press and hold START for about 1 second; voltage decreases approximately 0.6 volts each press and release.
Wait about 20 seconds for the Display to indicate a Status change from Volt Adj to Running, then press STOP to stop the genset and save the adjustment.
Restart the genset and check voltage.
Recalibrate AC Voltage on the Digital Display as instructed in the Operator's Manual.

Changing Frequency adjustment

The genset control box has jumper leads marked HZ SEL and 60 HZ.
Connect for 60 HZ; disconnect for 50 HZ.
Apply the appropriate reconfiguration label over the 'As Manufactured' block on the nameplate.

Changing Generator Set Frequency adjustment

⚠ When changing frequency, make sure the line circuit breakers are suitable for the new output.

Remove the control box cover.
Connect J5 to P6 for 60 Hz.
Disconnect J5 from P7 for 50 Hz.
Apply the appropriate reconfiguration label.
Replace the control box cover.
Check and adjust voltage as necessary after the frequency has been changed.

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
		50 Hz: Disconnect J5 from P7	J5, P6, P7	Frequency selection jumper leads in the genset control box
		60 Hz: Connect J5 to P6	J5, P6, P7	Frequency selection jumper leads in the genset control box
		HZ SEL / 60 HZ jumper leads in the control box	HZ SEL, 60 HZ	Connect for 60 Hz; disconnect for 50 Hz. Apply the appropriate reconfiguration label. Generator reconnection per schematic on Page A-2.
220/208	3	12 Lead Reconnectable		Applies to MDKDP (60 Hz), MDKDR (60 Hz), MDKDS
220/380	3	12 Lead Reconnectable		Applies to MDKDP, MDKDR, MDKDT, MDKDU
3-phase	3	12 Lead Reconnectable		Applies to MDDCW, MDDCU, MDDCY, MDDCS, MDDCT

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 V1305 family

Part #	Description	Category
ES1994	BATTERY NEGATIVE (-) CONNECTION	Battery
185-6934	Belt, Fan (37.5")	Belt
511-0201	Belts (24V)	Belt
149-2106	Element	Fuel filter
300-1500	Fuel Filter	Fuel filter
ES2020s	FUEL LINE CONNECTION	Fuel filter
M-1902s	FOAM GASKET IN WALL OF COMPARTMENT	Gasket
185-5421	Plug, Glow	Glow plug
185-5990	Glow plug	Glow plug
185-6725	24V Glow Plugs	Glow plug
185-7268	Glow Plug (24 Volt)	Glow plug
132-0349	Impeller kit w/cover & gasket	Impeller
132-0375	Impeller	Impeller
132-0379	Kit, Minor Service (Includes Parts Marked *)	Impeller
122-0810	Filter, Oil	Oil filter
185-5835	Filter, Oil	Oil filter
324-1491	Oil Filter	Oil filter
HH150-32430	OIL FILTER	Oil filter
HH160-32093	OIL FILTER	Oil filter
100-3459-01	Engine Assy, Replacement (12V)	Service part / kit
100-3459-02	Engine Assy, Replacement (24V)	Service part / kit
100-3478-02	Cruise Kit	Service part / kit
100-3478-04	Cruise Kit	Service part / kit
130-4434	Pencil, Zinc	Service part / kit
185-6721	Element, Breather	Service part / kit
185-7245	Block, Cylinder	Service part / kit
ALR190-K04	ALR Series Linear Actuator	Service part / kit
ALR190-KV03	ALR Series Linear Actuator	Service part / kit
ALR190-KV03DIT	ALR Series Linear Actuator	Service part / kit
ALR190-KV07	ALR Series Linear Actuator	Service part / kit
ALR190-P04	ALR Series Linear Actuator	Service part / kit
ALR190-Y04	ALR Series Linear Actuator	Service part / kit
ES1992	FUEL AND ELECTRICAL LINE ENTRANCE HOLES	Service part / kit
EXS1186	EXTEND TAIL PIPE 1” PAST OUTSIDE EDGE OF VEHICLE	Service part / kit
EXS1188	LOCATE TAIL PIPE IN SHADED AREA OR ABOVE DASH LINE	Service part / kit
324-1542	Fuel Injection Pump	Pump
612-6673	Water Pump	Pump
EXS1195s	MESH SHIELD PROTECTS USERS FROM HOT MUFFLER AND EXHAUST PARTS	Shield
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 16241-22310 Amazon eBay FridayParts $42.00 15521-23530 Amazon eBay FridayParts $68.25 19202-23540 Amazon eBay $34.99 FridayParts $68.25 4Pcs FridayParts $7.88 SinoCMP $25.90 16032-53900 Amazon eBay FridayParts $49.93 6C070-59212 FridayParts $90.00 R310H FridayParts $437.00 LF-3400 Amazon eBay $19.99 FridayParts $23.25 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 15291-43010 KuduParts $43.00 FridayParts $45.00 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 16241-22012 FridayParts $69.90 16271-42502 Amazon eBay $20.43 KuduParts $17.00 FridayParts $19.99 16271-42500 KuduParts $17.00 FridayParts $19.99 16241-35070 Amazon eBay $89.01 FridayParts $102.95 16241-65511 FridayParts $15.99 16241-65510 FridayParts $15.99 66706-55120 Amazon eBay $20.50 FridayParts $22.00 66704-55120 FridayParts $22.00 16264-04130 Amazon eBay FridayParts $18.00 16241-97010 FridayParts $26.79 3PCS FridayParts $9.90 SinoCMP $36.00 6672405 FridayParts $49.94 16271-03310 FridayParts $53.99 15263-12370 Amazon eBay FridayParts $13.99 19077-53650 Amazon eBay FridayParts $21.00 12691-43010 KuduParts $7.00 FridayParts $9.65 13351-43010 KuduParts $7.00 FridayParts $9.66 16281-65510 FridayParts $22.00 16851-65510 FridayParts $25.00 16415-65662 FridayParts $29.00 16271-53742 Amazon eBay KuduParts $31.00 FridayParts $33.50 16271-53740 KuduParts $31.00 FridayParts $33.50 15221-65510 FridayParts $29.50 15531-73011 FridayParts $58.60 15531-73270 FridayParts $58.60 16271-73260 Amazon eBay $49.00 FridayParts $48.50 15531-73014 FridayParts $13.44 1E401-73012 FridayParts $13.99

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
Fuel filter: Kubota 1522143081 Donaldson P550127 Wix 33390 Ac Delco TP1200
Oil filter: Kubota 1584132431 Donaldson P550726 Wix 51064 Baldwin B227

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

Also used in

Gehl 3825 — Skid Steer Loader
Gehl SL3825 — Skid Steer Loader
Kawasaki KLD 25Z — Loader Wheeled
Kawasaki KLD 35ZII — Loader Wheeled
Kramer 118 — Construction Equipment
Kubota B2710HSD — Tractor
Kubota F3060 — Mower
Kubota F3060-R — Mower
Kubota R310 — Loader Compact Wheel
Kubota RA300 — Loader Wheeled
Kubota ST25 — Tractor
Thomas 105 — Skid Steer Loader

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 V1305?

The Kubota V1305 engine has an oil capacity of 4.3 liters.

What is the displacement of the Kubota V1305?

The Kubota V1305 has a displacement of 1.335 liters with 4 cylinders.

Which generators use the Kubota V1305 engine?

The Kubota V1305 powers 5 generator set(s), including Cummins/Onan MDKAA, Cummins/Onan MDKAW, Cummins/Onan MDKB, Kubota 4318, Kubota J 310.

What oil filter does the Kubota V1305 use?

The Kubota V1305 uses oil filter part numbers Kubota 1584132431, Donaldson P550726, Wix 51064.

What fuel filter does the Kubota V1305 use?

The Kubota V1305 uses fuel filter part numbers Kubota 1522143081, Donaldson P550127, Wix 33390.

What air filter does the Kubota V1305 use?

The Kubota V1305 uses air filter part numbers Kubota K318182240, Kubota K318182250, Donaldson P778979.

How often should you change the oil in the Kubota V1305?

The Kubota V1305 oil change interval is every 100 hours.

What is a common problem with the Kubota V1305 engine?

A commonly reported issue on generators using the Kubota V1305 is: Engine does not crank from genset panel. Cause: Tripped DC Circuit Breaker CB1. Fix: Push ON to reset (p. 25); If the breaker trips again, reconnect the glow plug lead if loose and touching ground (p. 24).