The John Deere 4045HFG04A is a 4.5 L 4-cylinder turbo/air-to-air, after-cooled engine rated at 1800 rpm. It powers generator sets from Generac, including the MDG100DF4. It holds 15 L (4.0 gal) of oil.
Also known as: John Deere 4045HFG04A, 4045HFG04A
Part of the John Deere 4045 engine family — 67 variants share parts & fitment.
The cheapest captured merchant offer per filter — see the full cross-reference below for every OEM/aftermarket option.
Prices captured from merchant listings; some links are affiliate links. Verify against your serial number before ordering.
| Oil capacity | 15.0 L |
|---|---|
| Displacement | 4.5 L |
| Cylinders | 4 |
| Aspiration | Turbo/air-to-air, after-cooled |
| Rated speed | 1800 rpm |
Compiled from service & troubleshooting documentation across every generator set that uses the John Deere 4045HFG04A.
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | ||||
| Fuel filter | — | ||||
| Oil filter | — | ||||
| Battery | — | ||||
| Belt | — | ||||
| Coolant | — | ||||
| Oil | — | ||||
| Spark plug | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| Coolant | Other | 3 hr | 36 mo | Add coolant |
| DEF tank | Clean | 3 hr | 36 mo | |
| Fuel system | Other | 3 hr | 36 mo | Bleed fuel system |
| Fuses | Check | 3 hr | 36 mo | |
| Engine oil and oil filter | Change | 250 hr | First service — First change at 100 hours | |
| Oil vapor recirculation system/non-return valve | Check | 250 hr | ||
| Air intake hoses, connections and system | Check | 500 hr | 12 mo | |
| Automatic belt tensioner and belt wear | Check | 500 hr | 12 mo | |
| Cooling system | Check | 500 hr | 12 mo | |
| Engine electrical ground connection | Check | 500 hr | 12 mo | |
| Engine mounts | Check | 500 hr | 12 mo | |
| Fan belt | Inspect | 500 hr | 12 mo | Remove and check for wear; inspect pulleys/bearings |
| Generator drive plate torque | Check | 500 hr | 12 mo | |
| Leveling jacks | Lubricate | 500 hr | 12 mo | |
| Thermostats | Test | 500 hr | 12 mo | |
| Wheel bearings | Inspect | 500 hr | 12 mo | Increased inspection required under dusty or damp conditions |
| Trailer wheel bearings | Lubricate | 12 mo | or every 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.
| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Pressure | Oil pressure shutdown threshold | 5 | psi (34 kPa) | within five seconds of start |
| Speed | Low idle speed | 1,000-1,200 | rpm | |
| Speed | Ramp-up run speed | 1,800 | rpm | after 15 seconds at idle if idle switch OFF |
| Temperature | DEF freezing point | 12 | °F (-11°C) | |
| Temperature | DEF quality degrades above | 140 | °F (60°C) | |
| Temperature | Engine overheating shutdown threshold | 230 | °F | |
| Temperature | High coolant temperature shutdown | 210 | °F (99°C) | |
| Temperature | Maximum allowable coolant temperature limit | 235 | °F (113°C) | |
| Torque | Generator drive plate bolts | 40 | ft-lb (54 Nm) | |
| Torque | Trailer wheel lug nuts, first pass | 20-25 | ft-lb (27-33 Nm) | |
| Torque | Trailer wheel lug nuts, second pass | 50-60 | ft-lb (67-81 Nm) | |
| Torque | Trailer wheel lug nuts, third pass | 90-120 | ft-lb (122-162 Nm) |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Coolant | ethylene glycol antifreeze/water | 21.0 L (5.5 gal) | 50% water/50% antifreeze = -12°F(-24°C); 40/60 = -34°F(-36°C); max freeze protection 60% antifreeze = -54°F(-48°C) to -90°F(-67°C) | ||
| Def | AUS 32 per ISO 22241-1 | ISO 22241 / API DEF Certification / AdBlue | 41.6 L | 31.8-33.2% urea concentration; freezes below 12°F (-11°C); degrades above 140°F (60°C) | |
| Engine oil | John Deere Plus-50 / Plus-50 II; Torq-Gard Supreme; API CJ-4, CI-4 PLUS, CI-4, CH-4; ACEA E9, E7, E6, E5, E4 | API/ACEA | 15.0 L (3.92 gal, including filter) | 500-hour extended interval requires extended-drain oil pan, <2000 ppm sulfur fuel, John Deere Plus-50/Plus-50 II oil and approved filter | |
| Fuel | diesel | 641.85 L | Fuel tank capacity; usable 567.94 L |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Code | Name | Meaning | Severity | Action |
|---|---|---|---|---|
| Emergency Stop | Emergency Stop indicator LED | Emergency Stop switch is active (pushed in). | Shutdown | Deactivate (pull out) Emergency Stop switch. |
| Low Load | Low Load indicator LED | Genset has operated at less than 30% capacity for more than 15 minutes. | Warning | Increase electrical load or use a smaller generator. |
| Lug Door Open | Lug Door Open indicator LED | Lug-box door is open. | Warning | Close lug-box door; inspect door safety switch if unresolved. |
| Shutdown | Shutdown indicator LED | A shutdown alarm is present. | Shutdown | Resolve shutdown condition. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Tools: torque wrench
⚠ Do not attempt to start a unit in need of repair or scheduled maintenance
⚠ Carbon monoxide/asphyxiation hazard
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Part # | Description | Category |
|---|---|---|
| 100-025 | Air Filter | Air filter |
| 25-1476 | Air Filter Minders | Air filter |
| 25-1483 | Primary Air Cleaners | Air filter |
| 253108 | Element, air cleaner | Air filter |
| 301315 | Air Filter Element for Compressor | Air filter |
| DZi05100 | CRANKCASE VENT SYSTEM OCV FILTER | Air filter |
| F1000000001 | Air Filter | Air filter |
| G030070 | Air Cleaner Element (Engine) Primary | Air filter |
| G030071 | Air Cleaner Element (Engine) Secondary | Air filter |
| G030073 | Air Cleaner Element (Engine) Primary | Air filter |
| G030074 | Air Cleaner Element (Engine) Secondary | Air filter |
| G030077 | Air Cleaner Element (Engine) Primary | Air filter |
| G030078 | Air Cleaner Element (Engine) Secondary | Air filter |
| G30070 | Air Cleaner Element (Engine) Primary | Air filter |
| DZ123153 | ALTERNATOR | Alternator |
| RE509080 | ALTERNATOR (12V, DENSO) | Alternator |
| RE533516 | ALTERNATOR | Alternator |
| RE533653 | ALTERNATOR | Alternator |
| RE533654 | ALTERNATOR | Alternator |
| RE537146 | ALTERNATOR (28V, 50A) (3142) | Alternator |
| RE537508 | ALTERNATOR | Alternator |
| RE555751 | ALTERNATOR | Alternator |
| RE558675 | ALTERNATOR | Alternator |
| RE558676 | ALTERNATOR | Alternator |
| RE558678 | ALTERNATOR | Alternator |
| RES58675 | ALTERNATOR (24V, 60A) | Alternator |
| RM100225 | ALTERNATOR (REMAN FOR RE537146) (24 V, 50 A) (3104) | Alternator |
| SE502561 | ALTERNATOR (REMAN FOR RE537508) | Alternator |
| SE502626 | ALTERNATOR (REMAN FOR RE533516) (12V, 75A) (3138) | Alternator |
| SE502627 | ALTERNATOR (REMAN FOR RE533653) (12V, 95A) (3140) | Alternator |
| SE502628 | ALTERNATOR (REMAN FOR RE533654) (12V, 120A) (3141) | Alternator |
| RE536402 | SHORT BLOCK ASSEMBLY | Assembly |
| 100-024 | Belt | Belt |
| DZ118265 | FAN BELT | Belt |
| DZ118558 | FAN BELT | Belt |
| DZ118559 | FAN BELT | Belt |
| DZ118560 | FAN BELT | Belt |
| DZ118562 | FAN BELT | Belt |
| DZ118563 | FAN BELT | Belt |
| DZ118564 | FAN BELT | Belt |
| DZ118606 | FAN BELT | Belt |
| DZ118648 | FAN BELT | Belt |
| DZ118649 | FAN BELT | Belt |
| DZ118650 | FAN BELT | Belt |
| DZ118652 | FAN BELT | Belt |
| DZ118654 | FAN BELT | Belt |
| DZ119059 | FAN BELT | Belt |
| DZ119060 | FAN BELT (LGTH = 1555 mm) | Belt |
| DZ119061 | FAN BELT (LGTH = 1540 mm) | Belt |
| DZ119385 | FAN BELT (LGTH = 1650 mm) | Belt |
| DZ119477 | FAN BELT (LGTH = 1565 mm) | Belt |
| DZ119478 | FAN BELT (LGTH = 1570 mm) | Belt |
| DZ119515 | FAN BELT | Belt |
| DZ119522 | FAN BELT | Belt |
| DZ124645 | FAN BELT | Belt |
| F1000000005 | Belt | Belt |
| GM66704-1 | Fan Belt (12V) | Belt |
| GM66704-2 | Fan Belt (24V) | Belt |
| R525434 | FAN BELT (LGTH = 2180 mm) | Belt |
| R525435 | FAN BELT (LGTH = 2190 mm) | Belt |
| R533596 | FAN BELT | Belt |
| T428820 | FAN BELT (LGTH = 1580 mm) | Belt |
| SE501794 | COMPLETE BLOCK ASSEMBLY (without auxilary drive may not be as illustrated. Includes cylinder head with valves and rocker arm assembly, balancer shafts, oil pump assembly, complete gasket kit with front and rear seals) | Block assembly reman |
| SE501795 | COMPLETE BLOCK ASSEMBLY (auxiliary drive may not be as illustrated. Includes cylinder head with valves and rocker arm assembly, balancer shafts, oil pump assembly, complete gasket kit with front and rear seals) | Block assembly reman |
| SE503065 | AC COMPRESSOR (REMAN FOR AH169875) (12V, 10PA) (7427, 7414) | Compressor |
| F100-570 | CONTROL BOX ASSEMBLY | Control box |
| 100-037 | Coolant Filter | Coolant filter |
| F1000000004 | Coolant Filter | Coolant filter |
| F100-790 | ENGINE OPERATING PANEL ASSEMBLY | Engine operating panel |
| F100-680 | ENGINE & RADIATOR ASSEMBLY | Engine radiator |
| G122208 | Clarke Eng Fluid - 5 gal | Fluid |
| G122209 | Clarke Eng Fluid -1 gal | Fluid |
| 100-026 | Fuel Filter | Fuel filter |
| 25-1639 | Fuel Filters | Fuel filter |
| CO2775 | Element, Fuel Water Separator | Fuel filter |
| CO2776 | Element, Fuel Filter Primary | Fuel filter |
| DZ115390 | SECONDARY FUEL FILTER | Fuel filter |
| F1000000003 | Fuel Filter | Fuel filter |
| G021199 | Element, Fuel Filter Primary | Fuel filter |
| GM50006 | Fuel Filter | Fuel filter |
| GM50074 | Fuel Filter (primary) | Fuel filter |
| RE522868 | Fuel Filter | Fuel filter |
| RE541922 | PRIMARY FUEL FILTER | Fuel filter |
| RE544394 | FINAL FUEL FILTER | Fuel filter |
| RG11830A | Final Fuel Filter/Water Separator Base | Fuel filter |
| RG11830C | Replace Final Fuel Filter/Water Separator | Fuel filter |
| RG9091 | Final Fuel Filter Assembly | Fuel filter |
| RG12000 | Injection Pump Drive Gear Removal | Fuel pump |
| RG12002 | Injection Pump | Fuel pump |
| RG12022 | Fuel Supply Pump Push Rod | Fuel pump |
| RG12036 | JDG1559 Injection Pump Timing Pin | Fuel pump |
| RG7629B | Injection Pump Timing Marks A—Timing Mark on Front Plate B—Timing Mark on Injection Pump Flange | Fuel pump |
| RG7722 | Fuel Injection Pump | Fuel pump |
| RG9051 | Fuel Supply Pump Lines | Fuel pump |
| 0000I00 | Fuel Solenoid | Fuel solenoid |
| R136495 | Gasket | Gasket |
| R524468 | Gasket | Gasket |
| F100-460 | GENERATOR ASSEMBLY | Generator |
| F100-800 | GENERATOR ASSEMBLY | Generator |
| 302600 | Air/Oil Coalescer Element, spin-on canister | Hydraulic filter |
| RG12001 | Injector Pump Electrical Connector Removal | Injector |
| SE502671 | FUEL INJECTION NOZZLE (REMAN FOR RE545562) | Injector |
| F100-350 | NAME PLATE AND DECALS | Nameplate |
| 100-034 | Oil Filter | Oil filter |
| 223604 | Filter, oil | Oil filter |
| 25-1648 | Oil Filters | Oil filter |
| 302601 | Oil Filter Element for Compressor | Oil filter |
| 352793 | Oil Filter | Oil filter |
| 360031 | Filter, oil | Oil filter |
| C04521 | Element, Oil Filter | Oil filter |
| F1000000002 | Oil Filter | Oil filter |
| GM32809 | Oil filter | Oil filter |
| GM77161 | Oil Filter | Oil filter |
| RE504836 | OIL FILTER | Oil filter |
| 10000015220 | Panel, rear | Service part / kit |
| 10000015222 | Duct, rear | Service part / kit |
| 10000024262 | Decal, phase switch warning | Service part / kit |
| 10000024936 | Right rear corner assembly | Service part / kit |
| 10000024948 | Front hood assembly | Service part / kit |
| 10000024956 | Rear panel assembly | Service part / kit |
| 10000024971 | Foam, duct - side | Service part / kit |
| 10000024974 | Foam, rear duct - right | Service part / kit |
| 10000024975 | Left rear corner assembly | Service part / kit |
| 10000024976 | Left rear door assembly | Service part / kit |
| 10000024982 | Foam, control door | Service part / kit |
| 10000024983 | Foam, rear duct | Service part / kit |
| 10000024994 | Foam, rear duct - left | Service part / kit |
| 10000025002 | Foam, rear panel | Service part / kit |
| 10000027288 | Door, control - paralleling option | Service part / kit |
| 10000029864 | Decal set, MDG75 mechanical group | Service part / kit |
| 10000030536 | Foam, control door - paralleling option | Service part / kit |
| 10000030555 | Right rear corner assembly - paralleling | Service part / kit |
| 10000030564 | End panel assembly | Service part / kit |
| 10000030582 | Control door assembly - paralleling | Service part / kit |
| 12142 | Decal, ground | Service part / kit |
| 18396 | Decal, Panel Light Switch, Single | Service part / kit |
| 19M7838 | Screw | Service part / kit |
| 19M7862 | Screw | Service part / kit |
| 19M8306 | Screw | Service part / kit |
| 200389 | Frame & Parts, GC-40 JD4045 T3 | Service part / kit |
| 200390 | Engine & Parts, GC-40 JD4045 T3 | Service part / kit |
| 200391 | Generator & Parts, GC-40 JD4045 T3 | Service part / kit |
| 200392 | Radiator & Parts, GC-40 JD4045 T3 | Service part / kit |
| 200393 | Instruments & Parts, GC-40 JD4045 T3 | Service part / kit |
| 200394 | Gator & Parts, GC-40 JD4045 T3 | Service part / kit |
| 200395 | Compressor & Parts, GCRS-40-40 JD4045 T3 | Service part / kit |
| 200396 | Cooler & Parts, GCRS-40-40 JD4045 T3 | Service part / kit |
| 200403 | Decal & Parts, GCRS-40-40 JD4045 T3 | Service part / kit |
| 20677W | Duct, rear air | Service part / kit |
| 20795SRV | Foam, corner common | Service part / kit |
| 20798SRV | Foam, duct - face | Service part / kit |
| 20916Z | Bracket, prop rod | Service part / kit |
| 21259 | Decal, Battery Charger (Optional) | Service part / kit |
| 22870 | Decal, Caution for 480V CSA | Service part / kit |
| 23597 | Decal, Panel Light Switch (Optional) | Service part / kit |
| 23827 | Decal, Controller Switches | Service part / kit |
| 23846 | Decal, Controller Instructions | Service part / kit |
| 24904 | Decal, 4 Pos. Outlet Usage in Delta (Optional for MMG100CAN Only) | Service part / kit |
| 26386 | Decal, Pinch Point | Service part / kit |
| 28964 | Decal, Engine Block Heater (Optional) | Service part / kit |
| 2911200025 | Standard P/N | Service part / kit |
| 2911200026 | Cold Start P/N | Service part / kit |
| 2911200027 | Standard P/N | Service part / kit |
| 2911200028 | Cold Start P/N | Service part / kit |
| 30175 | Decal, UN31A tank caution | Service part / kit |
| 30176 | Decal, Flex - Tier III | Service part / kit |
| 30401W | Panel, end | Service part / kit |
| 30402SRV | Foam, end panel | Service part / kit |
| 30645 | Panel, emergency stop | Service part / kit |
| 307398 | Relief Valve (drawn as 39124) | Service part / kit |
| 310-537-3700 | Main | Service part / kit |
| 310-637-3284 | Parts Department | Service part / kit |
| 310-638-8046 | Service Department | Service part / kit |
| 31024 | Decal, Fan Clutch (Optional) | Service part / kit |
| 32107W | Panel, left rear | Service part / kit |
| 32124W | Panel, side | Service part / kit |
| 32125SRV | Roof assembly | Service part / kit |
| 32286SRV | Foam, side panel | Service part / kit |
| 33313SRV | Control door assembly | Service part / kit |
| 33642 | Window, control door - UV | Service part / kit |
| 33787 | Decal, Generator - Voltage Configuration (MMG100CAN6 Only) | Service part / kit |
| 34274 | Decal, Generator - 600V Circuit Breakers (MMG100CAN6 Only) | Service part / kit |
| 34275 | Decal, Caution - 120V & 240V Outlets | Service part / kit |
| 34989SRV | Assembly, E-stop switch | Service part / kit |
| 393531 | Side panel assembly | Service part / kit |
| 50876 | Decal, positive battery disconnect | Service part / kit |
| 51552 | Decal, high temp | Service part / kit |
| 5E502446 | REMAN CYLINDER HEAD (FOR DZ103843) | Service part / kit |
| 5E502450 | REMAN CYLINDER HEAD (FOR DZ103845) | Service part / kit |
| 60095 | Nut, .312-18 sflg | Service part / kit |
| 60268 | Rivet, .188 dia. x .126 to .250 grip, SS | Service part / kit |
| 60505 | Nut, .312-18 U-clip - long type | Service part / kit |
| 61091 | Screw, .312-18 x 1.00 ser flg hd | Service part / kit |
| 61371 | Optional Rear Shaft Guard, GC-40 JD4045 T3 | Service part / kit |
| 65470 | Switch, E-stop operator | Service part / kit |
| 65580 | Block, E-stop contactor | Service part / kit |
| 800-421-1244 | Main | Service part / kit |
| 800-427-1244 | Parts Department | Service part / kit |
| 800-672-7877 | Parts Department | Service part / kit |
| 800-835-2551 | Service Department | Service part / kit |
| 9753300442 | Oil sample kit | Service part / kit |
| AR106083 | Plug | Service part / kit |
| C07575 | DC Engine Wiring | Service part / kit |
| C07651 | Optional Engine Jacket Water Heater | Service part / kit |
| DCA-70USJ | Battery Connections | Service part / kit |
| DCA-85USJ | Battery Connections | Service part / kit |
| DZ105796 | OCV FILTER | Service part / kit |
| DZ109713 | SHORT BLOCK ASSEMBLY | Service part / kit |
| DZ109717 | SHORT BLOCK ASSEMBLY | Service part / kit |
| DZ109718 | 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 |
| DZ124403 | DIESEL EXHAUST FLUID INLINE FILTER | Service part / kit |
| F100-250 | WINGS | Service part / kit |
| F100-260 | WINGS | Service part / kit |
| F18910WAV65A | Name Plate And Decals | Service part / kit |
| F18910WAV66A | Generator Assembly | Service part / kit |
| F18910WAV70A | Control Box Assembly | Service part / kit |
| F18910WAV76A | Engine & Radiator Assembly | Service part / kit |
| F18910WAV80A | Engine Operating Panel Assembly | Service part / kit |
| F18910WAV84A | Output Terminal Assembly | Service part / kit |
| F18910WAV86A | Battery Assembly | Service part / kit |
| F18910WAV88A | Muffler Assembly | Service part / kit |
| F18910WAV90A | Fuel Tank Assembly | Service part / kit |
| F18910WAV96A | Enclosure Assembly | Service part / kit |
| F18910WAV98A | Radiator Cap - Removing the radiator cap while the engine is hot will result in high pressurized, boiling water to gush out of the radiator, causing severe scalding to any persons in the general area of the generator. | Service part / kit |
| F18910WAV99A | Coolant Drain Plug - Removing the coolant drain plug while the engine is hot will result in hot coolant to gush out of the coolant drain plug, therefore causing severe scalding to any persons in the general area of the generator. | Service part / kit |
| F18910WAVA0A | Engine Oil Drain Plug - Removing the engine oil drain plug while the engine is hot will result in hot oil to gush out of the oil drain plug, therefore causing severe scalding to any persons in the general area of the generator. | Service part / kit |
| G122188 | 250 hour Maintenance Kit (without fluids) | Service part / kit |
| G122189 | 250 hour Maintenance Kit (without fluids) | Service part / kit |
| G122190 | 250 hour Maintenance Kit (without fluids) | Service part / kit |
| G122191 | 250 hour Maintenance Kit (without fluids) | Service part / kit |
| G122192 | 250 hour Maintenance Kit (without fluids) | Service part / kit |
| G122193 | 250 hour Maintenance Kit (& engine fluids) | Service part / kit |
| G122194 | 250 hour Maintenance Kit (& engine fluids) | Service part / kit |
| G122195 | 250 hour Maintenance Kit (& engine fluids) | Service part / kit |
| G122196 | 250 hour Maintenance Kit (& engine fluids) | Service part / kit |
| G122197 | 250 hour Maintenance Kit (& engine fluids) | Service part / kit |
| G122198 | 500 hour Maintenance Kit (without fluids) | Service part / kit |
| G122199 | 500 hour Maintenance Kit (without fluids) | Service part / kit |
| G122200 | 500 hour Maintenance Kit (without fluids) | Service part / kit |
| G122201 | 500 hour Maintenance Kit (without fluids) | Service part / kit |
| G122202 | 500 hour Maintenance Kit (without fluids) | Service part / kit |
| G122203 | 500 hour Maintenance Kit (& Engine fluids) | Service part / kit |
| G122204 | 500 hour Maintenance Kit (& Engine fluids) | Service part / kit |
| G122205 | 500 hour Maintenance Kit (& Engine fluids) | Service part / kit |
| G122206 | 500 hour Maintenance Kit (& Engine fluids) | Service part / kit |
| G122207 | 500 hour Maintenance Kit (& Engine fluids) | Service part / kit |
| GM32386-KP1 | Exhaust Silencer, Hospital | Service part / kit |
| H23125 | Plug | Service part / kit |
| LX1016749 | Construct Dealer-Made Tools Safely | Service part / kit |
| M2872300204 | Parts List No. M2872300204 | Service part / kit |
| R111137 | Spring | Service part / kit |
| R113480 | FAN PULLEY | Service part / kit |
| R116296 | Cover | Service part / kit |
| R121043 | Oil Bypass Valve | Service part / kit |
| R123574 | Nut | Service part / kit |
| R128658 | FAN PULLEY | Service part / kit |
| R128659 | FAN PULLEY | Service part / kit |
| R128660 | FAN PULLEY | Service part / kit |
| R128661 | (OD = 183.5 mm) | Service part / kit |
| R128662 | FAN PULLEY (OD = 203 mm) | Service part / kit |
| R131765 | Plug | Service part / kit |
| R135918 | Bolt | Service part / kit |
| R502902 | Packing | Service part / kit |
| R503447 | Housing | Service part / kit |
| R503880 | CRANKSHAFT PULLEY | Service part / kit |
| R505567 | CRANKSHAFT PULLEY (OD = 173 mm) | Service part / kit |
| R515040 | Bushing | Service part / kit |
| R516648 | Cap Screw | Service part / kit |
| R517208 | Pulley | Service part / kit |
| R517237 | Bushing | Service part / kit |
| R520896 | Valve Cover | Service part / kit |
| R521326 | Valve Cover | Service part / kit |
| R521327 | Valve Cover | Service part / kit |
| R521401 | Medallion | Service part / kit |
| R522409 | Heat Shield | Service part / kit |
| R545125 | CRANKSHAFT PULLEY (OD = 188 mm) | Service part / kit |
| R545126 | CRANKSHAFT PULLEY (OD = 168 mm) | Service part / kit |
| RC115 | 12VDC SuperStart RC115 battery | Service part / kit |
| RE501377 | Filler Neck | Service part / kit |
| RE527858 | Screw M6 x 12 | Service part / kit |
| RE528742 | Deflector | Service part / kit |
| RE535560 | Filler Cap | Service part / kit |
| RE571269 | Piston marked RE509540; SUB FOR RE65957; also order RE527042 and DD15664; also order R503880, R515040 and R516648 or R505567, R515040 and R516648. | Service part / kit |
| RE67238 | Screw | Service part / kit |
| RE67239 | Screw | Service part / kit |
| RG11931 | Right Side of Engine | Service part / kit |
| RG11932 | Left Side of Engine | Service part / kit |
| RG12003 | Disconnect Fuel Delivery Lines | Service part / kit |
| RG7778 | UN—11NOV97 | Service part / kit |
| RG9060 | Dubuque Engine Serial Number Plate | Service part / kit |
| RG9061 | Saran Engine Serial Number Plate | Service part / kit |
| RG9062 | Torreon Engine Serial Number Plate | Service part / kit |
| RM100171 | COMPLETE BLOCK ASSEMBLY | Service part / kit |
| SE501094 | CONNECTING ROD (REMAN FOR RE500608) (4838) | Service part / kit |
| SE501096 | CONNECTING ROD | Service part / kit |
| SE501806 | CYLINDER HEAD (REMAN FOR RE531088) (5127) | Service part / kit |
| SE502447 | REMAN CYLINDER HEAD (FOR DZ103844) | Service part / kit |
| SE502768 | CYLINDER HEAD (REMAN FOR RE588246) | Service part / kit |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.
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.
The John Deere 4045HFG04A engine has an oil capacity of 15.0 liters.
The John Deere 4045HFG04A has a displacement of 4.5 liters with 4 cylinders.
The John Deere 4045HFG04A powers 1 generator set(s), including Generac MDG100DF4.
The John Deere 4045HFG04A uses oil filter part numbers John Deere RE519987, John Deere MIU800650, John Deere DZ118286.
The John Deere 4045HFG04A uses fuel filter part numbers John Deere AE20952, John Deere AT274723, John Deere RE62418.
The John Deere 4045HFG04A uses air filter part numbers John Deere AL204809, John Deere AT390262, John Deere AT390261.
A commonly reported issue on generators using the John Deere 4045HFG04A is: Shutdown indicator LED illuminates when a shutdown alarm is present.. Fix: Resolve by resolving shutdown condition..