Home›Engines›Kubota D722

Kubota D722 Engine

The Kubota D722 is a 0.72 L 3-cylinder turbocharged engine rated at 3600 rpm, producing up to 12.15 kW. It powers generator sets from Atlas Copco, Cummins/Onan, FG Wilson, Fischer Panda, Kubota and WhisperPower, including the XAS 38, XAS 38 KD, QD 6500 and KH9-1S. It holds 3.8 L (1.0 gal) of oil and 4.1 L (1.1 gal) of coolant.

Also known as: Kubota D722, D722

Part of the Kubota D722 engine family — 3 variants share parts & fitment.

0.719 L

Displacement

Cylinders

3600 rpm

Rated speed

12 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 D722

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

Air intake

1 required

1522211223Air filter$24.99eBay

Fuel system

1 required

607Fuel 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	3.8 L
Coolant capacity	4.1 L
Displacement	0.719 L
Cylinders	3
Aspiration	Turbocharged
Rated speed	3600 rpm
Gross power	12 kW

Generator sets powered by this engine

Shared across brands: Atlas Copco, Cummins/Onan, FG Wilson, Fischer Panda, Kubota, WhisperPower

Atlas Copco XAS 38Atlas Copco XAS 38 KDCummins/Onan QD 6500FG Wilson KH9-1SFischer Panda 12miniFischer Panda AGT-DC 10000 Fischer Panda MINI Fischer Panda Mini-Power StationFischer Panda PMS AGT-DC 10000Fischer Panda Panda 12 mini PMS Digital Fischer Panda Panda PMS AGT-DC 10000 Kubota GL 11000 Kubota GL 9000 Kubota GL11000-STD Kubota GL11000-USA Kubota GL6000D-AU-B Kubota GL9000-AUS Kubota GL9000-STD Kubota GL9000A-AU-B Kubota GL9000D-AU-B Kubota J110 WhisperPower Piccolo 10WhisperPower Piccolo 12WhisperPower Piccolo GV 3

How to read your Kubota engine serial & model number →

Common problems

The oil pressure lamp lights on when operating.
Cause: Insufficient engine oil.
Fix: Add engine oil.
Not started. — Not turned or slow turning.
Cause: Battery trouble.
Fix: Replacement of battery.
The water temperature lamp lights on when operating.
Cause: Engine overheating.
Fix: See "Precaution overheating" in "Radiator" section. (See page 97)
After electrical equipment connected, generator does not operate.
Cause: Circuit breaker is off.
Fix: Turn breaker "ON".
When the key is turned, the lamp doesn't light on.
Cause: Bulb is defective.
Fix: Replace
The battery charge lamp lights on when operating.
Cause: Poor contact of sub winding.
Fix: Connect tightly.
Circuit breaker can not be operated.
Cause: Overload
Fix: Reduce load.
Not started. Not turned or slow turning.
Cause: Battery trouble.
Fix: Replacement of battery.
Output cannot be obtained. — Rotation goes slow. Voltage drops. Breaker turns off.
Cause: Initial current is too much. (e.g. motor load)
Fix: Reduce load.
Output cannot be obtained. Rotation goes slow. Voltage drops. Breaker turns off.
Cause: Initial current is too much. (e.g. motor load)
Fix: Reduce load.
Not generating
Cause: Bad contact of brush
Fix: Check, cleaning and maintenance of contact face and contact force of brush and slip ring. (Danger: All works should be performed when stopped)
Normal turning, but not started.
Cause: Fuel shortage.
Fix: Refuel.
Not started. — Normal turning, but not started.
Cause: Fuel shortage.
Fix: Refuel.
Engine indicates loaded condition.
Cause: Short circuit of generator wiring
Fix: Stop immediately. Request for repair.
Battery fluid level stands below the LOWER mark.
Fix: Immediately, add distilled water until the fluid level is between the UPPER and LOWER levels. (for only refillable battery)

Compiled from service & troubleshooting documentation across every generator set that uses the Kubota D722.

Maintenance schedule

Item	Capacity	Part #	Interval
Air filter		—	160 hr
Fuel filter		—	320 hr
Oil filter		7665025430	160 hr	Amazon eBay $22.12 PartsGeek $7.98 NAPA $13.30
Battery		—	320 hr
Belt		—	600 hr
Coolant		—	320 hr
Oil	3.8	—	160 hr
Spark plug		—	600 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
Battery	Check	100 hr		First service — Initial 50 hours
Fuel line (fuel hose and clamp bands)	Check	50 hr		Every 50 hours
Fuel pipes and clamp bands	Check	50 hr		First service — Replace fuel pipes and clamp bands every 2 years or earlier
Oil filter cartridge	Change	200 hr		First service — Initial 50 hours
V-belt	Inspect	50 hr		Inspect after 50 operating hours.
Actuator trapezoid thread spindle	Lubricate	100 hr		every 100 h
Air cleaner element	Clean	100 hr		First service — Every 100 hours
Battery electrolyte	Check	100 hr
Engine oil	Change	100 hr		First service — thereafter
Fan belt	Check	100 hr		Damage, wear and tension
Fuel filter	Clean	100 hr		Clean every 100 hours of operation
Fuel filter element	Clean	100 hr		Every 100 hours
Fuel filter pot	Clean	100 hr
V-belt	Check	100 hr		check in very short time interval; replace if required
Complete inspection	Inspect	150 hr		After long-term standstill.
Electric wiring and loose connections	Check	200 hr
Fan belt tension	Check	200 hr
Oil filter cartridge	Replace	200 hr		First service — Replace earlier if necessary; after the initial 50 hours
Radiator hose and clamp bands	Check	200 hr	6 mo	Every 200 hours or every six months, whichever comes first
Radiator hoses and clamp bands	Check	200 hr	6 mo	whichever comes first
Engine Oil Filter	Change	250 hr		GL9000 Kubota Parts
V-belt	Replace	250 hr		Replacement interval must never be exceeded.
Fuel filter	Replace	300 hr		At the latest, depending on fuel contamination.
Fuel filter element	Replace	300 hr		minimum interval; depends on fuel contamination
Generator's brush ware	Check	300 hr		Every 300 hours
Generator's slip-ring	Check	300 hr		Every 300 hours
Fuel filter cartridge or element	Replace	400 hr		First service
Fuel filter element	Change	400 hr		Every 400 hours
Intake air hose	Check	400 hr		First service
Fan belt	Replace	500 hr
Fuel Filter	Change	500 hr		GL9000 Kubota Parts
Radiator	Clean	500 hr		Clean every 500 hours; also before adding anti-freeze and before stopping use of anti-freeze
Water jacket (radiator interior)	Clean	500 hr		Every 500 hours
Battery	Replace	800 hr	24 mo
Valve clearance	Adjust	800 hr		Check and adjust when engine is cold
Valve clearance	Check	800 hr		Adjust when engine is cold
Generator's ball bearing	Check	1000 hr		Every 1000 hours
Electric wiring	Inspect	1500 hr		Check for damage and loose connections
Fuel injection nozzle injection pressure	Check	1500 hr		Consult your local KUBOTA Dealer for this service
Fuel injection pressure	Check	1500 hr		Every 1500 hours

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	Air gap	0.5	mm
Clearance	Air gap	0.8	mm
Clearance	Air gap (rotor to stator)	0.5	mm
Clearance	Air gap (rotor to stator)	0.7	mm
Clearance	Crankshaft side clearance	0.15 to 0.31	mm
Clearance	Cylinder head surface flatness allowable limit	0.05	mm
Clearance	Cylinder liner I.D. (standard)	67.000 to 67.019	mm
Clearance	Fan belt deflection	12 to 14	mm	under load of 98 N (22.1 lbs.), pressed in middle of span
Clearance	Fan belt tension (deflection)	12 to 14	mm (0.47 to 0.55 in.)	pressed in middle of the span under load of 98 N (22.1 lbs.)
Clearance	Generator brush length (allowable limit)	4.5	mm
Clearance	Generator brush length (allowable limit)	7.5	mm
Clearance	Generator brush length (standard)	15.0	mm
Clearance	Oil clearance between crankpin and crankpin bearing	0.020 to 0.051	mm
Clearance	Piston ring gap, top ring	0.15 to 0.30	mm
Clearance	Slip ring outside diameter	49.7	mm
Clearance	Slip ring outside diameter	64.0	mm
Clearance	Slip-ring outside diameter	49.7	mm	correction limit 47.5 mm
Clearance	Slip-ring outside diameter	64.0	mm	correction limit 62.5 mm
Clearance	Top clearance	0.50 to 0.70	mm
Clearance	Valve recessing (intake and exhaust)	0.10 protrusion to 0.10 recessing	mm
Gap	Fan belt deflection	7.0 to 9.0	mm	at 98 N (10 kgf, 22 lbf)
Gap	Speed sensor air gap	0.3 to 0.8	mm	between sensor tip and gear tooth tips
Gap	Speed sensor tip to gear tooth tips	0.3 to 0.8	mm	installed
Injection timing	Injection pump timing	0.33 to 0.37 rad (19 to 21° before TDC)	rad
Injection timing	Injection timing	0.30 to 0.33 rad (19 to 21° before TDC)	rad
Other	Anti-freeze 50 vol% boiling point	108	°C	at 1.013 x 10^5 Pa (760 mmHg)
Other	Anti-freeze 50 vol% freezing point	-37	°C
Other	Battery charging rate (constant)	6.0	A	initial battery charge
Other	Battery electrolyte specific gravity	1.270 to 1.290		at 20 degrees C (68 degrees F)
Other	Battery electrolyte specific gravity at charge completion	1.27 to 1.29		charge completed
Other	Battery electrolyte specific gravity when fully charged	1.270 to 1.290		at 20°C (68°F)
Other	Battery normal charging rate	6.0	A
Other	Booster capacitors	2x40	µF
Other	Compressed air pressure for cleaning air cleaner element	under 205	kPa	at nozzle
Other	Compression ratio	23:1
Other	Coolant mixing ratio	50/50	%	premix 50% LLC with 50% clean soft water
Other	Cooling water requirement for raw water circuit	16-28	l/min
Other	Cooling water requirement for seawater circuit	16-28	l/min
Other	Excitation capacitors	4x50	µF
Other	Exhaust system total length	max. 6	m	standard 40mm hose; up to 10m with 50mm hose
Other	Frequency tolerance	+/- 0,1	%
Other	Fuel cetane number	45 minimum		greater than 50 preferred below -20°C or above 1500 m
Other	Fuel consumption	0.35	l/kW electrical power	between 30% and 80% of power rating
Other	Fuse on VCS printed circuit board	1.6	A	slow-to-blow
Other	Generator power factor	100	%
Other	Glow plug continuous use limit	20	seconds
Other	Inductive resistance H1/H2	0.5	mH
Other	Inductive resistance Z1/Z2	3.5	mH
Other	Oil consumption	max. 1	% of fuel consumption
Other	Oil consumption	max. 1% of fuel consumption
Other	Peak power 2 s	200	%	2 s
Other	Preheating time 10°C to -5°C (50°F to 23°F)	Until glow lamp goes off
Other	Preheating time above 10°C (50°F)	NO NEED
Other	Preheating time below -5°C (23°F)	Approx. 5 seconds after the glow lamp goes off		limit of continuous use 20 seconds
Other	Starter motor continuous running limit	10	seconds	if engine fails to start, wait about 30 seconds and try again
Pressure	Compressed air for air cleaner element cleaning	under 205	kPa	air pressure at nozzle
Pressure	Compression pressure	2.84 to 3.24	MPa	at 3.3 to 5.0 1/s (200 to 300 rpm) with starter
Pressure	Compression pressure allowable limit	2.26	MPa
Pressure	Cooling system purge	0.5	bar	compressed air
Pressure	Engine oil pressure at idle speed	More than 49	kPa	idle speed

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 ethylene glycol long-life coolant (LLC) and clean soft water	SAE J1034 / SAE J814c		3.7 L	Kubota genuine LLC has 2-year service life
Coolant	50/50 mix of long-life coolant (ethylene glycol type) and clean soft water	SAE J1034 / SAE J814c		3.7 L	Including reserve tank 0.6 L; change every 2 years; flush radiator with fresh water before use
Coolant	Clean water (soft water) with antifreeze 50/50	Permanent type (PT) antifreeze; refer to SAE J1034 / SAE J814c; 40 vol% freezing point -24 °C, 50 vol% -37 °C		3.7 L	Antifreeze mixing ratio must be less than 50 %
Coolant	Clean water (soft water), antifreeze 50/50			3.7 L	GL6000, GL7000; anti-freeze mixing ratio less than 50 %
Coolant	Ethylene glycol (EG) type long-life coolant, 50/50 mix with clean soft water	SAE J1034; SAE J814c		3.7 L	GL6000/GL7000 (Z482); 3.7 L (3.9 U.S.qts.), include reserve tank 0.6 L (0.63 U.S.qts.); change every 2 years
Coolant	GLYSANTIN PROTECT PLUS / G48				Water/antifreeze 70:30 -20°C; 65:35 -25°C; 60:40 -30°C; 55:45 -35°C; 50:50 -40°C. Antifreeze suitable for aluminium.
Coolant	Long-life coolant (LLC), ethylene glycol type, 50/50 with clean soft water	SAE J1034 / SAE J814c		3.7 L	GL6000, GL7000 (Z482); change every 2 years; includes reserve tank 0.6 L; GL9000/GL11000 (D722) = 4.1 L
Coolant	Pure water and anti-freeze			0.6 L	reserve tank volume; all seasons
Engine oil		API classification CF, CF-4, CG-4, CH-4 or CI-4 with ultra low sulfur fuel; CF with high sulfur fuel		2.2 L	GL6000/GL7000 (engine Z482); 2.2 L (2.3 U.S.qts.)
Engine oil	10W-30 or 10W-40	API CF or higher	below 10°C		below -10C
Engine oil	10W-30 or 10W-40 or 15W-40	API CF or higher / MIL-L-2104C			above 25C use 10W-30/10W-40/15W-40
Engine oil	API service class CF or higher	MIL-L-2104C		2.2 L	Change oil type according to ambient temperature
Engine oil	CF	High Sulfur Fuel [>0.05% (500 ppm)]			Other than North American market; halve intervals if CF-4/CG-4/CH-4/CI-4 used with high-sulfur fuel
Engine oil	CF, CF-4, CG-4, CH-4 or CI-4	Ultra Low Sulfur Fuel [<0.0015% (15 ppm)]			North American market; CJ-4 intended for DPF type engines
Engine oil	CF-4, CG-4, CH-4 or CI-4	Low Sulfur Fuel [<0.05% (500 ppm)] or Ultra Low Sulfur Fuel [<0.0015% (15 ppm)]			Other than North American market
Engine oil	SAE 10W-30 or 10W-40	API service class CF or higher (MIL-L-2104C)	below -10°C		below -10°C (14°F); oil viscosity higher than 10W-30 not allowed
Engine oil	SAE10W or SAE10W-30 / SAE10W-40	API CG	below 0°C		Below 0°C. Chapter B.2 states SAE10W or 10W-30 below 5°C.
Engine oil	SAE10W or SAE10W-30/10W-40	API CD or higher	below 0°C		Below 0°C (32°F)
Engine oil	SAE10W or SAE10W-30; SAE10W-40	API CC/CD/CF/CG	below 0°C	3.8 l	Below 0°C.
Engine oil	SAE10W-30		below -10°C		Below -10 degrees C (14 degrees F)
Engine oil	SAE10W-30, SAE10W-40, SAE10	Higher than CD class (API)	below 0°C		Below 0 °C (32 °F)
Engine oil	SAE10W-30, SAE30 (above 25 °C); SAE10W-30, SAE10W-40, SAE20 (0 to 25 °C); SAE10W-30, SAE10W-40, SAE10 (below 0 °C)	API classification higher than CF; CF, CF-4, CG-4, CH-4 or CI-4 for low/ultra low sulfur fuel; CF or CI-4 for internal/external EGR engines		2.2 L	Minimum TBN of 10 recommended with high sulfur fuel; change oil at approximately half intervals with high-sulfur fuel
Engine oil	SAE10W; SAE10W-30; SAE10W-40		below 0°C		Table F.5: below 0°C.
Engine oil	SAE10W-30 or SAE15W-40		-10°C to 25°C		-10 to 25 degrees C (14 to 77 degrees F)
Engine oil	SAE10W-30, SAE10W-40, SAE20	Higher than CD class (API)	0°C to 25°C		0 to 25 °C (32 to 77 °F)
Engine oil	SAE20 or SAE10W-30 / SAE10W-40	API CG	0°C to 25°C		0°C to 25°C. Chapter B.2 states SAE20 between 5°C and 20°C.
Engine oil	SAE20 or SAE10W-30/10W-40	API CD or higher	0°C to 25°C		0 to 25°C (32 to 77°F)
Engine oil	SAE20 or SAE10W-30; SAE10W-40	API CC/CD/CF/CG	0°C to 25°C	3.8 l	0°C to 25°C.
Engine oil	SAE20; SAE10W-30; SAE10W-40		0°C to 25°C		Table F.5: 0°C to 25°C.
Engine oil	SAE 10W-30 or 10W-40 or 15W-40	API service class CF or higher (MIL-L-2104C)	above 25°C		above 25°C (77°F)

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

Procedures

Adjust maximum engine speed adjustment

⚠ Switch off all load during work.

Tools: Two 14 mm spanners, Voltmeter TRMS 300 V AC

Disconnect electrical supply line to actuator.
Loosen max speed lock nut with two 14 mm spanners.
Connect voltmeter (TRMS, 300 V AC range) to AC outlet between 4 and 1.
Ensure no electrical load is connected.
Start generator.
Increase speed by turning spiral spindle manually until voltmeter shows 260 V.
Turn limit nut tight to keep speed setting.
Secure limit nut with lock nut.
Check voltage limited to max 260 V without load.
Re-adjust if necessary.

Adjust minimum engine speed adjustment

Tools: Spanners, Voltmeter

Loosen minimum speed locking and adjusting nuts.
Ensure no electrical load is connected.
Start generator.
Decrease speed by turning actuator spindle manually until voltmeter shows 200 V.
Tighten both nuts.
Check lower voltage limited to min 200 V without load.
Re-adjust if necessary.

Adjust valve clearance adjustment

⚠ Engine must be completely cold.

Tools: 22 mm spanner, 10 mm spanner, 11 mm spanner, Screwdriver, Feeler gauge

Ensure engine is completely cold.
Remove valve cover with 10 mm spanner.
Turn crankshaft pulley with 22 mm spanner until valve to be adjusted is closed and gap maximum.
Check valve gap with feeler gauge; gap should be 0.145 to 0.185 mm.
If adjustment needed, release locknut with 11 mm spanner.
Adjust gap with screwdriver and retighten locknut.
Recheck clearance and repeat if necessary.
Repeat for other valves.
Replace valve cover gasket and valve cover; tighten to 3.9 to 5.9 Nm.

Adjusting Fan Belt Tension adjustment

⚠ Be sure to stop the engine and remove the key before checking the belt tension.

⚠ Be sure to reinstall the detached safety shield after maintenance or checking.

Stop the engine and remove the key.
Apply moderate thumb pressure to belt between pulleys.
If tension is not as specified, loosen the lock nut and turn the adjust nut to get belt tension within range.
Tighten up the lock nut.
Replace fan belt if it is damaged.

Adjusting Valve Clearance adjustment

⚠ Valve clearance must be checked and adjusted when engine is cold.

Tools: Feeler gauge

Remove the head cover, the glow plugs and the timing window cover.
Align the 1TC mark line on the flywheel with center of timing window for No. 1 piston.
Check valve clearance with a feeler gauge.
Adjust with the adjusting screw if not within factory specification.
Turn flywheel 6.28 rad (360°) and adjust all other valve clearances.
Recheck clearance and firmly tighten the lock nut.

Adjusting the valve clearance at Kubota 02 series adjustment

Tools: Wrench W.A.F. 10 mm, Spanner W.A.F. 11 mm, Flat screwdriver, Feeler gauge

Unscrew valve cover.
Rotate crankshaft until valve to be adjusted is fully open.
Rotate crankshaft 360°; valve is then closed.
Check valve clearance with feeler gauge; cold clearance 0.145 to 0.185 mm.
Adjust with rocker arm screw; loosen counter nut first; retighten after adjustment.
Repeat for other valves; refit valve cover and tighten screws.

Adjustment of the maximum upper speed adjustment

⚠ This adjustment should not be changed; otherwise warranty expires.

Tools: voltmeter, SW 10 wrench

Disconnect actuator electrical supply plug.
Unclamp countering nut at limitation screw with SW 10 wrench.
Connect voltmeter up to 100 V DC to clamps 7 and 8 of VCS.
Ensure no electrical load is applied.
Start generator.
Turn actuator spindle manually until voltmeter reads 33 V.
Tighten limit stop screw against speed regulator lever.
Secure limit stop screw with countering nut.
Check voltage is limited to max. 33 V without load.

Checking Fan Belt Tension adjustment

Tools: Belt tension gauge

Measure the deflection by depressing the belt halfway between the fan drive pulley and alternator pulley.
Loosen the alternator mounting screws if not within specification.
Relocate the alternator to adjust.

Checking and Adjusting Valve Clearance adjustment

⚠ Valve clearance must be checked and adjusted when engine is cold.

Tools: Feeler gauge

Remove head cover, glow plugs and timing window cover on flywheel housing.
Align 1TC mark line on flywheel with center of timing window for No.1 TDC.
Check valve clearance with a feeler gauge.
If out of specification, adjust with adjusting screw.

Check capacitors diagnostic

⚠ Discharge capacitors before touching.

Tools: Multimeter with capacitor measuring

Ensure capacitors are discharged.
Visually check for dielectric leaks or swelling.
Set multimeter to continuity/pass.
Touch test prods to capacitor contacts; expect short beep from charge transfer.
Reverse prods; expect short beep again.
If steady sound or no sound, replace capacitor.
Use capacity measuring instrument to verify imprinted capacity.

Checking Fuel Injection Pressure diagnostic

⚠ Check after making sure nobody stands in the direction the fume goes.

Tools: Nozzle tester

Set the injection nozzle to a nozzle tester.
Slowly move the tester handle to measure pressure at which fuel begins jetting out.
Replace the adjusting washer in the nozzle holder to adjust if out of specification.

Insulation test diagnostic

Tools: voltmeter

Switch off all on-board electrical devices.
Start generator.
Measure AC voltage with voltmeter between generator housing and AC-Control box.
Measure AC voltage between generator housing and ground.
Measured voltage must not exceed 50 mV.
Check safety systems and leakage current relay if installed.

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 / 220 V	1 - 4	GL7000-STD, 60 Hz	Main coil R - W 0.25 ohm; BR - L 0.25 ohm	NFB capacity 29.5 A
110/220	1	Main coil	R - W; BR - L	GL7000-STD; 0.25 Ω each
110/220	1	Single phase 3 terminals type (1P4W type) dual voltage		GL7000-STD, 60 Hz
120 / 240 V	1 - 3	GL11000-USA, GL11000-USA-TM, 60 Hz	Main coil 1 - 3: 0.23 ohm; 1 - 2 and 2 - 3: 0.12 ohm; sub coil LG - LG 1.68 ohm; rotor coil 55.5 ohm	NFB capacity 42 A; GL11000-STD (110/220 V) main coil 0.19 / 0.10 / 0.10 ohm, sub coil 1.73 ohm, NFB 45.5 A
120 / 240 V	1 - 4	GL7000-USA, GL7000-USA-TM, 60 Hz	Main coil R - W 0.28 ohm; BR - L 0.28 ohm	NFB capacity 27.5 A
120/240	1	Main coil	R - W; BR - L	GL7000-USA; 0.28 Ω each
120/240	1	Receptacle output		GL7000-USA, GL11000-USA, 60 Hz
120/240	1	Single phase 3 terminals type (1P4W type) dual voltage		GL7000-USA-TM, 60 Hz
220	1	Main coil	R - W	GL6000-STD; 0.55 Ω
220	1	Single phase 2 terminals type		GL6000-STD, GL9000-STD, 50 Hz
220 V	1 - 2	GL6000-STD, 50 Hz	Main coil R - W: 0.55 ohm	Sub coil G - LG/R 1.08 ohm; sub coil (DC) L/W - L/W 0.11 ohm; detecting coil LG - L 0.05 ohm; rotor coil 59.5 ohm
220 V	1 - 3	GL9000-STD, 50 Hz	Main coil 1 - 3: 0.28 ohm; sub coil LG - LG 1.96 ohm; detecting coil R - R 0.04 ohm; rotor coil 55.5 ohm	NFB capacity 36.5 A; 240 V (GL9000-AUS) 0.34 ohm, NFB 33.5 A
240	1	Main coil	R - W	GL6000-AUS; 0.62 Ω
240	1	Receptacle output		GL6000-AUS, GL9000-AUS, 50 Hz
240 V	1 - 2	GL6000-AUS, 50 Hz	Main coil R - W: 0.62 ohm	NFB capacity 23 A

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 D722 family

Part #	Description	Category
32721-58242	Air Filter Inner	Air filter
412-035-00	Air Filter	Air filter
6C060-99410	Air Filter Outer	Air filter
G3102-8839-0	Air cleaner	Air filter
P02-004	Air filter	Air filter
07916-34041	Auxilary Socket for Fixing Crankshaft Sleeve	Auxiliary socket for fixing crankshaft sleeve
412-040-00	Battery	Battery
G3102-8833-0	Battery	Battery
P02-009	Battery	Battery
412-039-00	Belt	Belt
G3102-8832-0	V-belt	Belt
P02-007	Belt	Belt
P02-008	Belt	Belt
07909-31661	Connecting Rod Alignment Tool	Connecting rod alignment tool
W1062553	Connecting Rod Small End Bushing Tool	Connecting rod small end bushing tool
412-038-00	Coolant Filter	Coolant filter
G3102-8831-0	Coolant filter	Coolant filter
07916-32011	Flywheel Puller	Flywheel puller
1T021-43560	Fuel Filter	Fuel filter
412-037-00	Fuel Filter	Fuel filter
G3102-8838-0	Fuel filter	Fuel filter
GL9000	Fuel filter cartridge or element	Fuel filter
P02-006	Fuel filter	Fuel filter
G3102-8830-0	Gasket	Gasket
FP1-000421	Luftfiltereinsatz 100x60x15mm grob Typ 1	Hydraulic filter
FP1-000434	Ölfilter für Kubota Typ Z482, D722, D782, V800	Hydraulic filter
FP2-000370	Halterung für Kraftstofffilter Typ 025-RAC	Hydraulic filter
FP2-000371	Sammelbehälter für Kraftstofffilter Typ 025-RAC durchsichtig	Hydraulic filter
FP2-000373	Kraftstofffiltereinsatz Typ 025-RAC 10 micron inklusive O-Ring	Hydraulic filter
FP2-003434	Halter Kraftstofffilter für D722	Hydraulic filter
FP2-006951	Halterung Luftfiltereinsatz 63x63mm	Hydraulic filter
W1040289	Idle Gear Bushing Replacing Tool	Idle gear bushing replacing tool
W10252400	Injection Pump Pressure Tester	Injection pump pressure tester
412-036-00	Oil Filter	Oil filter
G3102-8841-0	Oil filter cartridge	Oil filter
HH150-32094	OIL FILTER	Oil filter
HH150-32430	OIL FILTER	Oil filter
P02-005	Oil filter	Oil filter
07916-32032	Oil Pressure Tester	Oil pressure tester
1535981	TRACK A 304/305	Service part / kit
W1046346	Brush length (Stretch out of the Holder)	Service part / kit
07909-30241	Plastigage	Plastigage
FP1-000410	Impellerpumpe F4B-9	Pump
FP1-000446	Entlüftungsadapter Motorwasserpumpe Kubota Motoren H=37mm	Pump
FP1-000582	Dichtung Wasserpumpe Z482/D722/V800	Pump
FP1-000597	Wasserpumpe Kubota Z 482 / D722	Pump
FP1-000637	Kühlwasserschlauch Wasserpumpe Z482 D722	Pump
FP1-000766	Halterung Impellerpumpe F4B-9	Pump
FP1-001724	Impellersatz für Pumpe F4B mit O-Ring und Dichtung	Pump
07909-31371	Red Check	Red check
412-041-00	Spark Plug	Spark plug
G3102-8836-0	Spark plug	Spark plug
P02-010	Spark plug	Spark plug
07916-09032	Special Use Puller Set	Special use puller set
FP1-000449	Oberteil für Thermostatgehäuse mit Entlüftung	Thermostat
FP1-000589	Dichtung Thermostatgehäuse	Thermostat
FP1-000604	Thermostatgehäuse Unterteil Z482	Thermostat
07909-33102	Valve Seat Cutter	Valve seat cutter

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

6670776 FridayParts $34.18 6669633 FridayParts $141.72 1G820-60022 Amazon eBay FridayParts $68.50 1G820-60012 FridayParts $68.50 1G820-60020 FridayParts $68.50 16851-35012 FridayParts $65.00 15841-74250 FridayParts $43.99 6A320-59210 FridayParts $98.54 LRS02300 FridayParts $98.54 1G023-63010 FridayParts $98.54 16871-03310 FridayParts $21.00 3Pcs FridayParts $9.90 SinoCMP $36.00 6670465 FridayParts $42.00 16851-22010 FridayParts $35.24 16851-22012 FridayParts $35.24 16851-22015 FridayParts $35.24 16851-22017 FridayParts $35.24 6674172 KuduParts $14.00 FridayParts $17.75 ZD22 FridayParts $245.00 15694-65992 FridayParts $18.58 15694-65990 Amazon eBay $15.01 FridayParts $18.58 S81NL FridayParts $18.58 SN1NL FridayParts $18.58 1G687-22010 FridayParts $58.60 67mm KuduParts $31.00 FridayParts $33.00 31351-31410 FridayParts $23.99 061700-2990 FridayParts $23.99 16604-52030 FridayParts $34.65 16851-52030 FridayParts $18.95 R1401-51352 FridayParts $18.95 R1401-51350 FridayParts $18.85 16415-65600 FridayParts $14.58 SinoCMP $69.00 16415-65602 FridayParts $14.58 19026-73260 FridayParts $17.50 19026-732602 FridayParts $17.50 19462-12312 FridayParts $78.50 19462-12310 FridayParts $78.50 16001-53904 FridayParts $57.19 1E231-60011 FridayParts $49.99 6687713 FridayParts $59.50 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 16851-52033 FridayParts $20.23 6C040-55412 FridayParts $27.20 15248-63590 FridayParts $27.20 6670340 FridayParts $65.00 4230021 FridayParts $38.20 15263-52030 FridayParts $30.04 SinoCMP $89.00 16871-53002 FridayParts $41.70 6652760 FridayParts $20.00 0.9KW FridayParts $149.00 6C140-59211 FridayParts $149.00 19883-63012 FridayParts $244.90 1661763011 FridayParts $244.90 19883-63010 FridayParts $244.90 16861-51010 FridayParts $438.21 16006-51012 FridayParts $438.21

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 1522211223 Kubota RG64842831 Kubota RG15842930 Kubota R141142289 Donaldson P628323 Donaldson P629463 Donaldson P102745 Donaldson P821575
Fuel filter: Kubota 607 Kubota 1258143013 Kubota 1522143081 Donaldson P502161 Donaldson P550012 Donaldson P551039 Donaldson P550127 Wix 33507
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 320 — Excavator
Bobcat 322 — Excavator
Bobcat 453 — Skid Steer Loader
Bobcat 453F — Skid Steer Loader
Bobcat E20 — Excavator Compact
Bomag BW80AD-2 — Compactor
Bomag BW80ADH-2 — Compactor
Kubota BX1800D — Tractor
Kubota BX1830D — Tractor
Kubota BX1850D — Tractor
Kubota BX1860D — Tractor
Kubota K008 — Excavator Compact

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 D722?

The Kubota D722 engine has an oil capacity of 3.8 liters.

What is the displacement of the Kubota D722?

The Kubota D722 has a displacement of 0.719 liters with 3 cylinders.

Which generators use the Kubota D722 engine?

The Kubota D722 powers 24 generator set(s), including Atlas Copco XAS 38, Atlas Copco XAS 38 KD, Cummins/Onan QD 6500, FG Wilson KH9-1S, Fischer Panda 12mini.

What oil filter does the Kubota D722 use?

The Kubota D722 uses oil filter part numbers Kubota 7665025430, Donaldson P550162, Wix 51334.

What fuel filter does the Kubota D722 use?

The Kubota D722 uses fuel filter part numbers Kubota 607, Kubota 1258143013, Kubota 1522143081.

What air filter does the Kubota D722 use?

The Kubota D722 uses air filter part numbers Kubota 1522211223, Kubota RG64842831, Kubota RG15842930.

How often should you change the oil in the Kubota D722?

The Kubota D722 oil change interval is every 160 hours.

What is a common problem with the Kubota D722 engine?

A commonly reported issue on generators using the Kubota D722 is: The oil pressure lamp lights on when operating.. Cause: Insufficient engine oil.. Fix: Add engine oil..