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John Deere RG6090HF485 Engine

The John Deere RG6090HF485 is a 9 L 6-cylinder turbocharged engine rated at 1800 rpm, producing up to 384 kW. It powers generator sets from Generac and Magnum, including the MMG320, MMG320 and MMG320 Super Start. It holds 70.9 L (18.7 gal) of coolant.

Also known as: John Deere RG6090HF485

Part of the John Deere 6090 engine family — 43 variants share parts & fitment.

9.0 L

Displacement

Cylinders

1800 rpm

Rated speed

384 kW

Gross power

On this pageSpecs Generator sets Maintenance FAQ Service intervals Torque & specs Fluids Fault codes Procedures Wiring

Engine specifications

Coolant capacity	70.9 L
Displacement	9.0 L
Cylinders	6
Aspiration	Turbocharged
Rated speed	1800 rpm
Gross power	384 kW

Generator sets powered by this engine

Shared across brands: Generac, Magnum

Generac MMG320 Magnum MMG320 Magnum MMG320 Super Start

How to read your John Deere engine serial & model number →

Common problems

WrnMaintenance — The period for servicing is set by the WrnMaintenance setpoint. The protection comes active if the running hours of the engine reach this value. 31
Wrn RA15 fail — Warning alarm in case of lost connection to IGL=RA15 module. 30
Wrn ECU Alarm — ECU alarm list is not empty. 29
Vgen<, > — The generator voltage is out of limits given by Gen <V and Gen <V setpoints. 27
Vgen unbal — The generator voltage is unbalanced more than the value of Volt unbal setpoint. 28
Underspeed — During starting of the engine, when the RPM reaches the value of Starting RPM setpoint, the starter is switched off and the speed of the engine can drop under Start RPM again. Then the underspeed protection becomes active. Protection evaluation starts 5 seconds after start up. 26
TimingSensor SPN:637
PositionSensor SPN:636
Overspeed or underspeed shut down
Cause: Engine speed out of adjustment (frequency above or below 60.0 Hz)
Fix: Disconnect all loads and restart the generator, read the frequency (Hz) on the LCD display (with no loads the frequency should read 60.0 Hz); If the frequency is above or below 60.0 Hz, adjust the engine speed — see the engine manual for throttle adjustments on mechanical governed units and see the electronic governor manual for electronically controlled units
Overcrank shut down
Cause: Fuel level low; Fuel pump not operating properly; Air filter blocked; Engine will not start
Fix: Check the fuel level in the tank; Check for proper operation of the fuel pump; Check air filter for blockage; Consult the engine operation and maintenance manual for additional information on troubleshooting starting problems
Low oil pressure shut down
Cause: Engine oil level low; Oil leaks; Oil pressure sender faulty
Fix: Check the level of the engine oil with the dipstick and add oil if required; Visually inspect the engine for oil leaks; Restart the unit and verify the loss of oil pressure, shutting the engine down immediately if the oil pressure value does not read 5 psi (34 kPa) within five seconds; Check the oil pressure sender and refer to the troubleshooting section of the engine operation and maintenance manual
Low fuel level shut down
Cause: Fuel level low; Leaks in the fuel tank; Fuel level sender and connecting wiring damaged
Fix: Check the fuel level on the LCD window and confirm the generator is sitting level to ensure an accurate reading; Check for leaks in the fuel tank; Check the fuel level sender and the connecting wiring for damage and check for continuity between the sender and the engine controller
Low coolant level shut down
Cause: Coolant level low; Leaks in coolant hoses, engine block or water pump; Coolant mixed with engine oil
Fix: Allow the engine to cool; Check the coolant level in the radiator, add coolant until it is 3/4" below the filler neck and secure the radiator cap; Inspect coolant hoses, engine block and water pump for visible leaks; Check the engine oil to verify no coolant has mixed with it and consult the engine operation and maintenance manual
Intake Temp SPN:105
InjectorCyl#6 SPN:656

Compiled from service & troubleshooting documentation across every generator set that uses the John Deere RG6090HF485.

Maintenance schedule

Item	Spec	Part #
Air filter	paper element	—
Battery	1000 CCA	—
Coolant	Consult the engine operation and maintenance manual for coolant recommendations and proper mixture	—
Oil	John Deere PLUS-50 or equivalent	—

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
Engine oil and oil filter	Change	250 hr		First service — Change after first 100 hours, then every 250 hours. If John Deere PLUS-50 or equivalent is used, every 500 hours.
Oil vapor recirculation system/non-return valve	Check	250 hr
Air intake hoses, connections, and system	Check	500 hr	12 mo
Battery	Inspect	500 hr	12 mo	Service battery
Belt tensioner and belt wear	Check	500 hr	12 mo	At 500 hour/12 month interval, remove belt and check for wear; inspect pulleys and bearings
Coolant pump weep hole foam filter	Check	500 hr	12 mo
Cooling system	Check	500 hr	12 mo
Engine ground connection	Check	500 hr	12 mo
Engine mounts	Check	500 hr	12 mo
Fuel filters/water separator	Replace	500 hr	12 mo	Replace fuel filters/clean water separator
Generator drive plate torque	Check	500 hr	12 mo	See page 45
Leveling jack(s)	Lubricate	500 hr	12 mo
Oil vapor recirculation filter	Replace	500 hr	12 mo
Thermostats	Test	500 hr	12 mo
Air cleaner elements	Replace	2000 hr	24 mo
Alternator and fan belts	Replace	2000 hr	24 mo
Coolant	Check	2000 hr	24 mo	Add coolant
Electrical wiring and connections	Check	2000 hr	24 mo
Fuel system	Drain	2000 hr	24 mo	Bleed fuel system
Fuses	Check	2000 hr	24 mo
Engine oil filter	Change	8803 hr		Last changed 10/25/2024, 8803HRS

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
Other	Engine hours at test steps	8801.8 / 8801.9 / 8802.1 / 8802.4 / 8802.6 / 8802.9 / 8803	hours	warm up through cool down
Other	Fine voltage adjustment window (V Detect)	45	seconds
Other	Fuel level low fuel shutdown setpoint	5	%
Other	Fuel level low fuel warning setpoint	15	%
Other	Load bank output (start / 15min / 30min / 45min / 1hr)	270	kW	at ~324-327 A per phase, 482-484 V, 60 Hz, power factor 1
Pressure	Air filter restriction indicator - replace element	20	in. H2O
Pressure	Air filter restriction indicator - replace primary air cleaner	25	in. H2O
Pressure	Engine oil pressure, low oil pressure shut down	less than 20	psi (138 kPa)
Pressure	Engine oil pressure, normal operating	35-80	psi (241-552 kPa)	engine running
Pressure	Engine oil pressure, verify within 5 seconds of start	5	psi (34 kPa)	within 5 seconds of start
Pressure	Oil pressure (warm up / start / 15min / 30min / 45min / 1hr / cool down)	44 / 36 / 35 / 34 / 32 / 32 / 36	not stated	load bank test 10/25/2024
Speed	Generator frequency, no load	60.0	Hz	no load
Speed	Operating speed	1800	rpm
Temperature	Ambient temperature (warm up / start / 15min / 30min / 45min / 1hr / cool down)	49 / 49°F / 49°F / 50°F / 50°F / 50°F / 50°F	°F	load bank test 10/25/2024
Temperature	Coolant temperature (warm up / start / 15min / 30min / 45min / 1hr / cool down)	104 / 185°F / 186°F / 186°F / 186°F / 188°F / 165°F	°F	load bank test 10/25/2024
Temperature	Coolant temperature minimum display	100	°F (38°C)
Temperature	Maximum water/coolant temperature shut down	230	°F (110°C)
Temperature	Viscous fan clutch temperature range	170-200	°F (77-93°C)
Torque	Generator drive plate bolts	33	ft-lb (45 Nm)
Torque	Shorting (link) board hardware	25	ft-lbs
Torque	Trailer wheel lug nuts, first pass	20-25	ft-lbs (27-33 Nm)
Torque	Trailer wheel lug nuts, second pass	50-60	ft-lbs (67-81 Nm)
Torque	Trailer wheel lug nuts, third pass	90-120	ft-lbs (122-162 Nm)
Voltage	Battery voltage, normal reading on 12 volt systems	13-14	V	engine running
Voltage	Battery voltage, normal reading on 24 volt systems	24-26	V	engine running
Voltage	DC voltage (all steps)	13.7	V	load bank test 10/25/2024
Voltage	Voltage regulation	+/- 1	%

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	Capacity	Notes
Coolant	60/40		Cold weather applications
Engine oil	John Deere PLUS-50 or equivalent		Consult the engine operation and maintenance manual for the proper grade of oil, including special operating conditions. If John Deere PLUS-50 or equivalent is used, oil can be changed every 500 hours.
Fuel	diesel	459.0 gal	Steel, single wall fuel tank; 24 hr. run time – full load
Grease	High quality grease made specifically for lubrication of wheel bearings		Trailer wheel bearings; minimum lubrication every 12 months or 12,000 miles (19,312 km)

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
AnInIOM Sd	AnInIOM Sd	Shutdown alarm configurable on the input of IG-IOM/IGS-PTM.	Shutdown
AnInIOM Wrn	AnInIOM Wrn	Warning alarm configurable on the input of IG-IOM/IGS-PTM.	Warning
Battery Flat	Battery Flat (low battery)	If the controller switches off during starting sequence due to bad battery condition, it doesn't try to start again and activates this protection.	Shutdown
Binary Input	Binary Input	Configurable warning/shutdown alarms on the inputs of IL-NT.
ChrgAlternFail	ChrgAlternFail	Failure of the alternator to charge the battery.	Warning
EmergencyStop	EmergencyStop	If the input Emergency Stop is opened or the red E-Stop button is pushed, shutdown is immediately activated.	Shutdown
Engine Temp Sd	Engine Temp Sd	Water temperature is greater than Sd Water Temp setpoint.	Shutdown
Engine Temp Wrn	Engine Temp Wrn	Water temperature is greater than Wrn Water Temp setpoint.	Warning
Fgen<, >	Fgen<, >	The generator frequency is out of limits given by Gen >f and Gen <f setpoints.	Shutdown
Fuel Level Sd	Fuel Level Sd	Fuel level is smaller than Sd Fuel Level setpoint (5%).	Shutdown
Fuel Level Wrn	Fuel Level Wrn	Fuel level is smaller than Wrn Fuel Level setpoint (15%).	Warning
GCB fail	GCB fail	Failure of the generator circuit breaker.	Shutdown
Igen unbl	Igen unbl	The generator current is unbalanced.	Shutdown
Low BackupBatt	Low BackupBatt	RTC backup battery is flat (low).	Warning
Oil Press Sd	Oil Press Sd	Oil pressure is smaller than Oil Press Sd setpoint.	Shutdown
Oil Press Wrn	Oil Press Wrn	Oil pressure is smaller than Oil Press Wrn setpoint.	Warning
Overload	Overload	The load is greater than the value given by Overload setpoint.	Shutdown
Overspeed	Overspeed	The protection comes active if the speed is greater than Overspeed setpoint.	Shutdown
ParamFail	ParamFail	Wrong checksum of parameters. Happens typically after downloading new firmware or changing of the parameter. The controller stays in INIT mode.		Check all parameters, write at least one new parameter.
PickupFault	PickupFault	Failure of the magnetic pick-up sensor for speed measurement.	Shutdown
Sd IOM fail	Sd IOM fail	IOM/IGS-PTM module.	Shutdown
SprinkIActive	SprinkIActive	The protection is active if the output Sprinkler is closed.	Warning
Start failed	Start failed	Unit did not start.	Shutdown
Stop fail	Stop fail	Unit did not stop.	Shutdown
Ubat	Ubat	Battery voltage is out of limits given by Batt Undervolt setpoints.	Warning
Underspeed	Underspeed	During starting, when the RPM reaches Starting RPM setpoint the starter switches off and speed can drop under Start RPM again; underspeed protection becomes active. Evaluation starts 5 seconds after start up.	Shutdown
Vgen unbal	Vgen unbal	The generator voltage is unbalanced more than the value of Volt unbal setpoint.	Shutdown
Vgen<, >	Vgen<, >	The generator voltage is out of limits given by Gen <V and Gen >V setpoints.	Shutdown
Wrn ECU Alarm	Wrn ECU Alarm	ECU alarm list is not empty.	Warning
Wrn RA15 fail	Wrn RA15 fail	Warning alarm in case of lost connection to IGL=RA15 module.	Warning
WrnMaintenance	WrnMaintenance	The period for servicing is set by the WrnMaintenance setpoint. The protection comes active if the running hours of the engine reach this value (250 hours).	Warning

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 the Display Back Lighting adjustment

Press and hold Enter.
Press the up or down buttons on the Diagnostics keypad to increase or decrease brightness.
Release the Enter button when the desired brightness is attained.

Changing Output Voltage adjustment

⚠ NEVER ATTEMPT TO CHANGE THE VOLTAGE WHILE THE ENGINE IS RUNNING. LETHAL VOLTAGE MAY BE PRESENT AT THE CONNECTION LUGS ON THE SHORTING (LINK) BOARD.

Tools: Wrench, Torque wrench

Shut the generator down and set main circuit breaker and control power switch to OFF.
Remove all 1/2 in. nuts holding the shorting (link) board.
Move the board to the lower position for 480/277V 3Ø or the upper position for 208/120V 3Ø.
Replace all hardware and tighten to 25 ft-lbs of torque.
Reinstall the reconnect box door and start the generator per the Pre-Start Check List.

Resetting of the Time to Service Reminder adjustment

With the unit shut down, power up the controller with the Control On/Off toggle switch.
Press Page Select, move the cursor down to Engine Protect and press Enter.
Press Enter; the current run time in hours appears under WrnMaintenance.
Press the up arrow and reset the current run time hour setting to 250.
Press Enter to save the current run time hour setting.
Move the CONTROL ON/I toggle switch to the CONTROL OFF/O position.

Checking Generator Drive Plate Torque maintenance

Tools: Torque wrench

Disconnect the engine starting battery.
Remove the generator fan guard.
Torque each of the drive plate bolts to 33 ft-lb (45 Nm).
Reinstall the generator fan guard and reconnect the battery.

Trailer Wheel Bearings maintenance

Tools: Grease gun

Remove the small rubber plug on the grease cap.
Attach a standard grease gun fitting to the grease zerk fitting.
Pump grease into the fitting until new grease is visible around the nozzle.
Wipe any excess grease from the hub and replace the rubber plug.

AUTO (Remote) Starting of the Generator operation

Perform a manual start of the generator at least once to verify correct operation.
Press the AUTO button; LCD window highlights AUTO in the upper left corner.
Close the main circuit breaker (set to ON/I).
Secure the generator by closing and locking all access doors.
The generator is now ready for remote starting.

Auto Exercise Timer operation

⚠ The controller must be in AUTO mode to run at the programmed time.

Press the PAGE SELECT button until Password appears at the top of the screen.
Press the down arrow to select Date/Time and press ENTER.
Press the down arrow to select Timer1 Repeat and press ENTER; choose the day(s) and press ENTER.
Select Timer1 ON Time and press ENTER; adjust the desired start time.
Select Timer1Duration and press ENTER; set the run duration.
Press PAGE SELECT three times to return to the main menu.
Press the AUTO button to switch modes to automatic.

Auxiliary Fuel Tank Option operation

Shut down the unit and check that the internal tank fuel level is above five percent.
Attach the auxiliary fuel tank fuel lines to the AUXILIARY FUEL INLET and AUXILIARY FUEL OUTLET fittings.
Open the AUXILIARY FUEL INLET and AUXILIARY FUEL OUTLET valves inside the right front door.

Fuel Transfer Pump Option operation

Shut down the unit (not required if external bulk supply is already connected).
Attach the external bulk fuel supply to the FUEL TRANSFER INLET fitting.
Turn on the fuel transfer switch.

Manual Starting of the Generator operation

⚠ CARBON MONOXIDE: USING A GENERATOR INDOORS CAN KILL YOU IN MINUTES!

Move the control ON/OFF toggle switch to the CONTROL ON/I position.
LCD window indicates MAN mode and Ready; Ready/Manual LED is lit.
Press the green ENGINE START button.
Prestart (Preheat) screen is displayed with a countdown from 20 seconds to zero.
Starting screen is displayed; the engine cranks and starts running.
Running screen displays.
LCD toggles between Generator Display Screen and Engine Display Screen.
If engine does not start, controller pauses 15 seconds and makes two more attempts (three total).
If no start after three cycles, LCD shows SD Start Fail; wait two minutes and press FAULT RESET.
Engine speeds up to a constant 1800 rpm.
Check for excessive noise or vibration and coolant, oil or fuel leaks before applying loads.
Check AC output voltage; fine adjust with the fine voltage adjustment screw if needed.
Check frequency reads approximately 60 Hz with no loads.
Switch main circuit breaker ON, then convenience outlet breakers as needed.

Shutting Down the Generator operation

⚠ If the unit does not shut down within 15 seconds, a Stop Fail alarm is displayed.

Open all circuit breakers to remove loads from the generator.
Let the engine run approximately five minutes to allow it to cool down.
Push the red ENGINE STOP button; a 15 second Stop Value timer starts.
Move the CONTROL ON/OFF toggle switch to the CONTROL OFF/O position.

Towing the Trailer operation

Use the jack to raise or lower the trailer onto the hitch; lock the hitch coupling.
Attach the safety chains or cables to the vehicle and raise the jack foot completely.
Connect trailer wiring; check stop and signal lights.
Make sure all doors are properly latched.
Check trailer tire inflation.
Check the wheel lugs and tighten or replace any loose or missing.
Limit highway towing speed to 45 mph (72 km/h).

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
		Cam lock connections	L1 - Black, L2 - Red, L3 - Blue, N (Neutral) - White, G (Ground) - Green	Series 16 taper nose 400A, 600V cam locks; make all connections to one side only
120	3	Low Delta	T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12	Dedicated 12 lead generators option
120/208V	three phase	Low Wye		Link / Reconnect Board
120/240V	single phase	Zig Zag		4 position phase switch option
120/240V	three phase	Delta		4 position phase switch option
208/120	3	Link board attached in 208 VOLT 3Ø position (upper position)	T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12	Shorting (link) board upper position
208/120	3	Low Wye	T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12	Dedicated 12 lead generators option
240/120	1	Low Zig Zag	T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12	Dedicated 12 lead generators option
240/120	3	High Delta	T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12	Dedicated 12 lead generators option
277/480V	three phase	High Wye		Link / Reconnect Board
480/240	1	High Zig Zag	T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12	Dedicated 12 lead generators option
480/277	3	High Wye	T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12	Dedicated 12 lead generators option
480/277	3	Link board attached in 480 VOLT 3Ø position (lower position)	T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12	Shorting (link) board lower position

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 John Deere 6090 family

Part #	Description	Category
AT387574	ALTERNATOR	Alternator
RE500226	ALTERNATOR	Alternator
RE551447	ALTERNATOR	Alternator
RE551448	ALTERNATOR	Alternator
RE558676	ALTERNATOR	Alternator
RE65414	ALTERNATOR	Alternator
SE501838	ALTERNATOR (REMAN FOR AT387574) (24V, 100A) (3152)	Alternator
SE502563	ALTERNATOR	Alternator
4UA10	15 Relay I/O Board	Battery
DZ118761	FAN BELT	Belt
DZ118828	FAN BELT	Belt
DZ118995	FAN BELT	Belt
R519476	FAN BELT	Belt
T428848	FAN BELT	Belt
SE501759	CONNECTING ROD (REMAN FOR DZ122131)	Connecting rod
RM100131	CONTROLLER	Controller
SE502800	CONTROLLER	Controller
SE501747	CYLINDER HEAD	Cylinder head
RG13813	Location of Engine Serial Number Plate	Engine identification
RG13814	Engine Serial Number Plate	Engine identification
RG13820	Option Code Label	Engine identification
RG14799	Engine Serial Number Plate	Engine identification
AR44402	Valve Stem Lubricant	Fluid
AR54749	Soap Lubricant	Fluid
DZ110558	SECONDARY FUEL FILTER	Fuel filter
DZ112918	SECONDARY FUEL FILTER	Fuel filter
PFF51674	Secondary Fuel Element (OEM: RE506428)	Fuel filter
PFF5551	Primary & Secondary Fuel Kit (OEM: RE525523, RE527961)	Fuel filter
RE520906	PRIMARY FUEL FILTER	Fuel filter
RE525523	Fuel filter	Fuel filter
RE527961	FUEL FILTER	Fuel filter
RE539465	PRIMARY FUEL FILTER	Fuel filter
SE501947	FUEL INJECTION NOZZLE (REMAN FOR DZ100221)	Fuel injection nozzle
TY6299	PERMATEX AVIATION (Form-A-Gasket No. 3), 227 g (8 oz) container	Gasket
SE501948	FUEL INJECTION NOZZLE	Injector
DZ118283	OIL FILTER	Oil filter
RE509672	OIL FILTER	Oil filter
RE530346	OCV FILTER	Oil filter
4067C	Puck model 4067C lagoon boat, powered by a 280-kW (375-hp) PowerTech Plus 9.0L engine	Service part / kit
51048	Pâte LOCTITE Moly Paste	Service part / kit
A34471	UN—11OCT88	Service part / kit
APM303	Control Panel	Service part / kit
AR31790	Adhésif plastique SCOTCH-GRIP EC1099	Service part / kit
CB125100-200	Coolant heater, 2500W, 120V	Service part / kit
CB125110-200	Coolant heater, HotStart, 2500W, 120V	Service part / kit
CTM106819	Application List	Service part / kit
CTM385	9.0 L Diesel Engines — Level 14 Electronic Fuel System with Denso HPCR	Service part / kit
CTM67	OEM Engine Accessories	Service part / kit
D-292865	Battery charger, 120/240V, 5.1/3A	Service part / kit
D17005BR	flexible cylinder hone	Service part / kit
D17006BR	hone	Service part / kit
DSAB45549	Litho in U.S.A. (10-07)	Service part / kit
DZ113609	SHORT BLOCK ASSEMBLY	Service part / kit
DZ114640	DIESEL EXHAUST FLUID (DEF) DOSING UNIT FILTER	Service part / kit
DZ114695	DEF TANK INLET SCREEN	Service part / kit
DZ121189	SHORT BLOCK ASSEMBLY	Service part / kit
DZ121193	SHORT BLOCK ASSEMBLY	Service part / kit
DZ124403	DIESEL EXHAUST FLUID INLINE FILTER	Service part / kit
GM106699-S	Battery (Kohler)	Service part / kit
JDE1963	Collier-compresseur	Service part / kit
JDE93	Pince à segment	Service part / kit
JRG10040	Front right lifting lug	Service part / kit
JRG10059	Rear left lifting lug	Service part / kit
JRG23	Engine lifting crossbar	Service part / kit
M3227	Canopy	Service part / kit
PT506	Composé NEVER-SEEZ - Aérosol de 453 g	Service part / kit
PT569	Composé NEVER-SEEZ - À appliquer au pinceau, 227 g	Service part / kit
R518277	CRANKSHAFT PULLEY	Service part / kit
R527478	CRANKSHAFT PULLEY	Service part / kit
RE520465	TORSIONAL DAMPER	Service part / kit
RE537960	TORSIONAL DAMPER	Service part / kit
RE57604	TORSIONAL DAMPER	Service part / kit
SE501748	CONNECTING ROD (REMAN FOR DZ122131)	Service part / kit
SE502544	CONNECTING ROD	Service part / kit
SE502847	COMPLETE BLOCK ASSEMBLY	Service part / kit
TS203	Acid	Service part / kit
TS204	Battery Explosions	Service part / kit
TS271	Avoid Hot Parts	Service part / kit
TS677	Install Fan Guards	Service part / kit
TY15941	LOCTITE® 620	Service part / kit
TY15969	LOCTITE 609 Retaining Compound — 50 ml bottle	Service part / kit
TY9370	Composé de blocage et d'étanchéité pour filetages LOCTITE 242 (résistance moyenne) (bleu) - Tube de 6 ml	Service part / kit
TY9374	LOCTITE 592 Pipe Sealant with TEFLON (white), 6 mL (0.2 oz) tube	Service part / kit
TY9375	LOCTITE 592 Pipe Sealant with TEFLON, 50 mL (1.7 oz) tube	Service part / kit
SE501228	WATER PUMP (REMAN FOR RE530194)	Pump
SE501922	FUEL INJECTION PUMP (REMAN FOR RE571640)	Pump
SE502545	WATER PUMP	Pump
SE502546	OIL PUMP	Pump
TY43512	Composé de blocage et d'étanchéité pour filetages LOCTITE 242 (résistance moyenne) (bleu) - Bouteille de 50 ml	Seal
DZ118217	Cam Sensor Bushing DZ118217	Sensor
RE506103	STARTER	Starter
RE529661	STARTER	Starter
RE549230	STARTER	Starter
RE556999	STARTER	Starter
RE564633	STARTER	Starter
SE501866	STARTER (REMAN FOR RE506103) (24 V)	Starter
SE502823	STARTER	Starter
SE502374	TURBOCHARGER	Turbocharger
SE502547	TURBOCHARGER	Turbocharger

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

RE518339 FridayParts $108.70 RE531334 FridayParts $108.70 RE543187 FridayParts $239.99 SE501270 Amazon eBay $310.00 FridayParts $239.99

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

Common questions

What is the displacement of the John Deere RG6090HF485?

The John Deere RG6090HF485 has a displacement of 9.0 liters with 6 cylinders.

Which generators use the John Deere RG6090HF485 engine?

The John Deere RG6090HF485 powers 3 generator set(s), including Generac MMG320, Magnum MMG320, Magnum MMG320 Super Start.

What is a common problem with the John Deere RG6090HF485 engine?

A commonly reported issue on generators using the John Deere RG6090HF485 is: WrnMaintenance — The period for servicing is set by the WrnMaintenance setpoint. The protection comes active if the running hours of the engine reach this value..