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John Deere RG6135HF485 Engine

The John Deere RG6135HF485 is a 13.5 L turbocharged engine rated at 1800 rpm. It powers generator sets from Generac and Magnum, including the MMG405, MMG465, MMG405 and MMG405 Super Start. It holds 90.4 L (23.9 gal) of coolant.

Also known as: John Deere RG6135HF485

Part of the John Deere 6135 engine family — 28 variants share parts & fitment.

13.5 L

Displacement

1800 rpm

Rated speed

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

Engine specifications

Coolant capacity	90.4 L
Displacement	13.5 L
Aspiration	turbocharged
Rated speed	1800 rpm

Generator sets powered by this engine

Shared across brands: Generac, Magnum

Generac MMG405 Generac MMG465 Magnum MMG405 Magnum MMG405 Super Start Magnum MMG465

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 RG6135HF485.

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter	paper element		—

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

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	Fine voltage adjustment window (V Detect)	45	seconds
Other	Fuel level low fuel shutdown setpoint	5	%
Other	Fuel level low fuel warning setpoint	15	%
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
Speed	Generator frequency, no load	60.0	Hz	no load
Speed	Operating speed	1800	rpm
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	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	Standard	Ambient	Capacity	Notes
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.
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
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
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 6135 family

Part #	Description	Category
20145-17038	Air Filter	Air filter
DZ123153	ALTERNATOR	Alternator
RE537508	ALTERNATOR	Alternator
RE550906	ALTERNATOR	Alternator
RE555751	ALTERNATOR	Alternator
RE558675	ALTERNATOR	Alternator
RE558676	ALTERNATOR	Alternator
RE558678	ALTERNATOR	Alternator
20145-17044	Belt	Belt
DZ118692	FAN BELT	Belt
DZ118694	FAN BELT (LGTH = 1605 mm)	Belt
DZ119558	FAN BELT (LGTH=1635 mm)	Belt
R128806	FAN BELT (LGTH= 1765 mm)	Belt
R531878	FAN BELT (LGTH= 1805mm)	Belt
R531879	FAN BELT (LGTH=1840 mm)	Belt
20145-17042	Coolant Filter	Coolant filter
RG13879	Engine model designation and application chart	Engine identification
RG13880	Engine option code label	Engine identification
RG6135H000000	Engine serial number plate	Engine identification
AR44402	Valve Stem Lubricant	Fluid
AR54749	Soap Lubricant	Fluid
20145-17040	Fuel Filter	Fuel filter
DZ112918	SECONDARY FUEL FILTER	Fuel filter
RE539465	PRIMARY FUEL FILTER	Fuel filter
R81276	Cylinder liner shim, 0.05 mm (0.002 in.)	Gasket
20145-17036	Oil Filter	Oil filter
RE572785	OIL FILTER	Oil filter
115-2422	Battery	Service part / kit
220089	Tornillo (16 mm)	Service part / kit
220213	Tornillo (8 mm)	Service part / kit
5M4272	GENSET WEIGHT (WET) 8560 LBS	Service part / kit
776536-1	Tyco Connector for camera with PAL or NTSC signal	Service part / kit
875/65R29	Tires on 5-piece rims	Service part / kit
944K	Loader operating information is based on machine with identified linkage and standard equipment, PowerTech PSS 6135 (EPA Final Tier 4/EU Stage IV) engine, ROPS cab, rear cast bumper/counterweight, transmission side-frame guards, bottom guards, standard tires, full fuel tank, and 79-kg (175 lb.) operator. This information is affected by changes in tires, ballast, and different attachments.	Service part / kit
A34471	UN—11OCT88	Service part / kit
DZ100304	Diesel Exhaust Fluid Inline Filter	Service part / kit
DZ110562	Crankcase Vent System (USE WITH DZ113378 974G)	Service part / kit
DZ111004	DEF TANK HEADER FILTER (25 Micron)	Service part / kit
DZ111166	(3402) (3404) (3408) (3409) (974G)	Service part / kit
DZ111246	FAN PULLEY	Service part / kit
DZ111247	FAN PULLEY	Service part / kit
DZ111248	FAN PULLEY	Service part / kit
DZ112023	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
DZ124402	DIESEL EXHAUST FLUID INLINE FILTER	Service part / kit
JDG10014	Conjunto de herramienta de extracción del manguito EUI	Service part / kit
JDG10014P1	Punta roscada	Service part / kit
JDG10014P2	Macho M10	Service part / kit
JDG1847	chavetas	Service part / kit
JDG970A	Soporte de levante de balancines	Service part / kit
JDG971	Pasadores de sincronización	Service part / kit
JDG978	Macho especial	Service part / kit
PM37418	LOCTITE® 243 (resistencia mediana, azul)	Service part / kit
PT569	Composé NEVER-SEEZ - À appliquer au pinceau, 227 g	Service part / kit
R529123	CRANKSHAFT PULLEY & DAMPER (OD=211 mm)	Service part / kit
R532124	CRANKSHAFT PULLEY & DAMPER (OD=187 mm)	Service part / kit
R87277	Suplemento de camisa (0.10 mm)	Service part / kit
RE539805	CRANKSHAFT PULLEY & DAMPER (6812)	Service part / kit
RG13887	A—Engine Serial Number B—Application Data or Type C—Serial Number Plate	Service part / kit
RG14798	Engine Serial Number/Application Data	Service part / kit
RG14813	OEM Engine Option Code Label	Service part / kit
RG40854	0000007 UN—19—06MAY05	Service part / kit
T6828AB	OILSCAN	Service part / kit
T6829AB	COOLSCAN	Service part / kit
TS206	Wear Protective Clothing	Service part / kit
TS220	Remove Paint Before Welding or Heating	Service part / kit
TS677	Install Fan Guards	Service part / kit
TS953	UN—15MAY90	Service part / kit
20145-17046	Spark Plug	Spark plug
RE539584	STARTER (12V)	Starter
RE540886	STARTER	Starter
RE70756	STARTER (12 V)	Starter
01879	STOP	Stop engine

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

RE531195 FridayParts $38.50 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 RG6135HF485?

The John Deere RG6135HF485 has a displacement of 13.5 liters.

Which generators use the John Deere RG6135HF485 engine?

The John Deere RG6135HF485 powers 5 generator set(s), including Generac MMG405, Generac MMG465, Magnum MMG405, Magnum MMG405 Super Start, Magnum MMG465.

What is a common problem with the John Deere RG6135HF485 engine?

A commonly reported issue on generators using the John Deere RG6135HF485 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..