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Home›Generac›Generac MFH500

Generac MFH500 Generator Set

The Generac MFH500 is a generator set powered by a Isuzu 4JJ1TT4 engine. It holds about 15.85 L (4.2 gal) of oil.

3.0 L
Displacement
15.85 L
Oil capacity
3
Document types

How to read your Generac serial & model number →

Specifications

Emissions4 Final
ControllerIFM CR0403, Murphy PV405
Oil capacity15.85 L

Engine

Isuzu 4JJ1TT4
Displacement3.0 L
AspirationTurbo, Liquid Cooled
Rated speed2000 rpm

Maintenance & consumables

for the Isuzu 4JJ1TT4
ItemSpecCapacityPart #Interval
Air filterReplace every 500 hours of operation, or annually58741160706750 hr PartsGeek kuduparts $67.00
Fuel filterremove water and change element—1000 hr find
Oil filterreplace as required0027371000 hr PartsGeek
Beltinspect for condition and tightness—8760 hr find
Coolant50/50 ethylene glycol base anti-freeze/water mix, or 60/40 antifreeze/water mix—730 hr
Coolant filterreplace as required—250 hr find
OilCheck engine oil level15.85 L20964950 hr PartsGeek

Common questions

What engine does the Generac MFH500 use?

The Generac MFH500 is powered by the Isuzu 4JJ1TT4 engine.

Troubleshooting

15

Symptoms & remedies

SymptomCauseRemedy
Exhaust smoke is whiteInsufficient warm-up time.Conduct warm-up operation.
Engine control system problemContact a GMASD.
Faulty injection pumpContact a GMASD.
Engine running is unstableFuel system problem.
Water or air in fuel systemPurge air or remove water. See Removing Water From Fuel.
Exhaust smoke is blackExcessive speed.Verify engine rpm. Check AVR adjustment.
Clogged air cleanerClean or change element.
Clogged intercoolerContact a GMASD.
Engine overheatsNo coolant.; Front of radiator is clogged with dust.; Sub tank cap is not tightened.; Fouled coolant.Add coolant. See Adding Coolant.; Clean with soft brush.; Tighten or replace sub tank cap.; Clean inside of radiator and change coolant. See Adding Coolant.
Oil pressure does not riseIncorrect engine oil viscosity.; Insufficient engine oil level.Change with oil of correct viscosity. See Draining Fluids—Central Fluid Drain System and Refilling Engine Oil.; Replenish oil. See Refilling Engine Oil.
Engine problemContact a GMASD.
Engine has no powerClogged air cleaner.; Clogged pre-fuel filter.; Clogged fuel filter.Clean element.; See Removing Water From Fuel.; Remove water and change element. See Removing Water From Fuel.
Incorrect fuel typeElectromagnetic type fuel pump problem.
Engine cranks but will not startNo fuel.Verify there is no fuel leakage and replenish.
Engine will not crank (electric start)Discharged battery.Replace battery. See Battery Installation and Replacement.

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.

Parts

118
Part #DescriptionQtySystem
000181WARNING: Vision Loss. Eye protection is required to avoid spray from spark plug hole when cranking engine.Spark plug PartsGeek
001576Digital Controller Status Messages1Controller PartsGeek
001577Engine Oil Recommendations1Engine oil recommendations PartsGeek
002593Fan beltBelt PartsGeek
002594Oil dipstickOil filter PartsGeek
00259963cc pump (behind shield)1Pump PartsGeek
00260063cc pump (behind shield)1Pump PartsGeek
002601Battery, 12 VDC, 950 CCA, Group Number: 242Battery PartsGeek
002737Exxon Mobile DTE-10 ISO VG 68 hydraulic oil1Hydraulic fluid PartsGeek
28540CLAMP, HOSE - CONSTANT TORQUE - 1.75-2.6251Hose PartsGeek
29653FITTING, NIPPLE, PIPE-.500NPTX4.0001Air filter PartsGeek
3020571HOSE, CAC 2.00” X 4.00” LONG4Air filter PartsGeek
3020703KEY SWITCH W/KEYS1Air filter PartsGeek
3020798SCREW, 8-32X.500 PAN PHIL G21Hose PartsGeek
3020815FITTING, 390-16-16 SPLIT FLANGE FF1Air filter PartsGeek
3021141TUBE, MOTOR RETURN1Air filter PartsGeek kuduparts $129.99
3021142TUBE, MOTOR SUPPLY1Air filter PartsGeek
3021156HOSE, PUMP OUTLET/INLET1Hose PartsGeek
3021158FITTING, STRAIGHT -16 X 16 FF1Air filter PartsGeek
3021159FITTING, 90° -16 X -20 FF1Air filter PartsGeek
3021165FITTING, 90° FF - LONG1Air filter PartsGeek
3023369HOUSING AIR CLEANER1Air filter PartsGeek kuduparts $26.00
42197WASHER, .500 SPLIT LOCK - SS1Air filter PartsGeek
51784TUBE, MOTOR CASE DRAIN1Air filter PartsGeek
52634WFITTING, NIPPLE .500NPT X 3.001Air filter PartsGeek
60140NUT, .375-16 HEX, G57Air filter PartsGeek
60180WASHER, .625 SPLIT LOCK2Air filter PartsGeek
60204WASHER, .500 SPLIT LOCK12Air filter PartsGeek
60206WASHER, .250 FLAT .735/.060 - SS3Air filter PartsGeek
60277PLUG, .375 NPT6Air filter PartsGeek kuduparts $33.00
60386SCREW, .375-16 X 1.00 STANDARD HEX - SS2Air filter PartsGeek kuduparts $62.00
60467PUMP, 63CC2Pump PartsGeek
60507SCREW, .375-16 X 1.00 STANDARD HEX - SS2Air filter PartsGeek
60515WASHER, .375 FLAT .993/.0648Air filter PartsGeek
60670WASHER, .500 FLAT 1.060/.110, G812Air filter PartsGeek
60698WASHER, .500 FLAT 1.250/.060 - SS40Air filter PartsGeek
60700SCREW, .500-13 X 1.500 STANDARD HEX - SS14Air filter PartsGeek
60701WASHER, .312 SPLIT LOCK - SS4Air filter PartsGeek
60702SCREW, .500-13 X 1.00 STANDARD HEX - SS1Air filter PartsGeek
61023SCREW, .625-11 X 2.00 STANDARD HEX, G82Air filter PartsGeek
62277SCREW, M12-1.75 X 25 STANDARD HEX, G10.94Air filter PartsGeek
A0000072045WASHER, .375 FLAT .993/.0641Air filter PartsGeek
A0000115924VALVE, CHECK 225 PSI1Air filter PartsGeek
A0000181059WASHER, .500 FLAT, 1.375/.090 - SS1Pump PartsGeek
A0000199401WASHER, .510 SNUB 2.00/,1301Air filter PartsGeek
A0000210063BOLT, CARRIAGE .375-16 X 10.001Air filter PartsGeek
A0000210066WASHER, .500 FLAT 1.060/.090 - SS1Air filter PartsGeek
A0000210067WASHER, .500 SPLIT LOCK - SS4Air filter PartsGeek
A0000300698WASHER, .250 FLAT .625/.050 - SS1Air filter PartsGeek
A0000344868HOSE. 90° SPLIT FLANGE 2.001Air filter PartsGeek
A0000416905FILTER, 7 MICRON1Air filter PartsGeek
A0000504510CAP, RADIATOR-16 PSI3Air filter PartsGeek
A0000527692WASHER, .625 FLAT 1.750/.10-.16 - SS1Air filter PartsGeek
A0005183839STW HOSE SHIELD BRACKET1Hose PartsGeek
A0005183845STW HOSE SHIELD COVER1Hose PartsGeek
A0005346725FITTING STRT #8 ORBM X #8 ORFS1Air filter PartsGeek
G022237WASHER, .375 SPLIT LOCK7Air filter PartsGeek
MAC3521SCREW, .500-13 X 1.00 STANDARD HEX - SS1Air filter PartsGeek
MAC3522VALVE, BALL 8 ORB1Air filter PartsGeek
MAC3551FITTING, STRAIGHT .500MNPT X .500ORB1Air filter PartsGeek
MAC3561WASHER, .375 FLAT .993/.0641Air filter PartsGeek
MAC3574FILTER, 9 MICRON1Air filter PartsGeek
MAC3597FITTING, TEE -8 RUN MALE1Air filter PartsGeek
MAC3700FITTING, 90° ELBOW 1.00” - BLACK PIPE1Air filter PartsGeek
MAC3737SCREW, .375-16 X 1.00 STANDARD HEX - SS1Air filter PartsGeek
MAC3831GASKET, EXHAUST 3.001Gasket PartsGeek
MAC4098HOSE, PUMP CASE DRAIN1Hose PartsGeek
MAC4165FILTER, 7 MICRON1Air filter PartsGeek
MAC42605.00 PSI PRESSURE TRANSDUCER1Air filter PartsGeek
P245-003Air Filter1Air filter PartsGeek
P245-006Oil Filter1Oil filter PartsGeek
P245-009Fuel Filter1Fuel filter PartsGeek
P245-012Coolant Filter1Coolant filter PartsGeek
P245-015Belt1Belt PartsGeek
P245-018Battery1Battery PartsGeek
P245-021Spark Plug1Spark plug PartsGeek
000130AVERTISSEMENT Démarrage accidentel. Lorsque vous travaillez sur l’appareil, débranchez le câble négatif de la batterie, puis le câble positif. Le non-respect de cette consigne pourrait entraîner la mort ou des blessures graves.Service part / kit PartsGeek
000137aBattery HazardsService part / kit PartsGeek
000163aRisque de brûlures. N’ouvrez pas et n’endommagez pas les batteries. Les batteries contiennent une solution électrolytique pouvant causer des brûlures et la cécité. Si la solution électrique entre en contact avec la peau ou les yeux, rincez avec de l'eau et demandez une aide médicale immédiate.Service part / kit PartsGeek
000228AVERTISSEMENT Risque environnemental. Recyclez toujours les batteries dans un centre de recyclage officiel, conformément aux lois et aux réglementations locales. Le non-respect de cette consigne pourrait causer des dommages à l'environnement, la mort ou des blessures graves.Service part / kit PartsGeek
10000038540DECAL, PROP 651Service part / kit PartsGeek
10000044487DECAL 750-950 FLAMELESS HEATER OP INSTR1Service part / kit PartsGeek
3020931COUPLER, FLYWHEEL4Service part / kit PartsGeek
3021116CONTROL PANEL1Service part / kit PartsGeek
3021166FITTING, 16-20 FLANGE - CODE 621Service part / kit PartsGeek
3021167ASSEMBLY, HYDRAULIC MANIFOLD1Service part / kit PartsGeek
3021311ASSEMBLY, CONTROL BOX MOUNT.1Service part / kit PartsGeek
3021681SHROUD, TOP1Service part / kit PartsGeek kuduparts $277.99
3021682SHROUD, OIL DEFLECTOR1Service part / kit PartsGeek
3022471DECAL, SAFETY1Service part / kit PartsGeek
3023511WASHER, .265 FENDER 1.250/.0601Service part / kit PartsGeek
60205WASHER, .375 SPLIT LOCK - SS4Service part / kit PartsGeek FridayParts $63.98
60340SCREW, .250-20 X .875 STANDARD HEX - SS2Service part / kit PartsGeek
60727WELDMENT, FUEL TANK40Service part / kit PartsGeek
60983ASSEMBLY, ENGINE 4JJ1TABW-01 - T46Service part / kit PartsGeek
61082VALVE, PAS 2.00” DIAMETER ESD-24V1Service part / kit PartsGeek
61190INDICATOR / SWITCH. TANK LEVEL1Service part / kit PartsGeek
62086NUT, .312-18 U-CLIP - SHORT TYPE3Service part / kit PartsGeek
A0000115601BLOCK, HYDRAULIC MANIFOLD1Service part / kit PartsGeek
A0000210064ASSEMBLY, PANEL BOTTOM - LH1Service part / kit PartsGeek
A0000210065ASSEMBLY, PANEL BOTTOM - RH1Service part / kit PartsGeek
A0000212765ASSEMBLY, LED LIGHT 12/24VDC1Service part / kit PartsGeek
A0000214944INDICATOR / SWITCH. TANK LEVEL1Service part / kit PartsGeek
A0000348521BOX, CONTROL1Service part / kit PartsGeek
A0000348682ENGINE CHANNEL, REAR2Service part / kit PartsGeek
A0000374787COVER, FUEL SENDING UNIT1Service part / kit PartsGeek
A0000374788WASHER-FLAT 1/4 USS1Service part / kit PartsGeek
A0000499164ASSEMBLY, EXHAUST3Service part / kit PartsGeek
A0000499165NUT, 8-32 NYLK G 6.01Service part / kit PartsGeek
A0002384132VALVE FLOW CONTROL PV76 W DEUTSCH1Service part / kit PartsGeek
A0003888149BLOCK HYD MANIFOLD IRON1Service part / kit PartsGeek
A0005344667CHECK VALVE FAN MOTOR1Service part / kit PartsGeek
A0005458297VALVE ASSY HEAT COIL 500F/750F1Service part / kit PartsGeek
MAC3576HYDRAULIC HEAT EXCHANGER1Service part / kit PartsGeek
MAC3621BREATHER, TANK1Service part / kit PartsGeek
MAC3758MAIN RELIEF CARTRIDGE (SYSTEM SAFETY)1Service part / kit PartsGeek
MAC3855KIT, 2.00 SPLIT FLANGE1Service part / kit PartsGeek
MAC3938FITTING, 45° FF1Service part / kit PartsGeek

Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.

Fuel consumption

RatingLoadL/hgal/h
Prime
Standby

Available documents

Reference — flameless-heater-release-xxxOwner's manual — A0000244024 (Generac)Parts manual — mfh500tdi-parts-manual (Generac)