The Cummins/Onan 6B T5.9-G Configuration No. D402012GX02 is an engine. It powers generator sets from Cummins/Onan, including the 45MDGDC, 55MDGDC, 60MDGDD and 70MDGDD.
Also known as: Cummins 6B T5.9-G Configuration No. D402012GX02
Part of the Cummins/Onan 6BT5.9 engine family — 8 variants share parts & fitment.
How to read your Cummins/Onan engine serial & model number →
| Part # | Description | Category |
|---|---|---|
| 982-0200 | Air Filter | Air filter |
| FP-3034946 | Multi-Groove Fan Belts (Ribbed 8) (62.5" X 1.125") | Belt |
| FP-3911558 | Belt, V Ribbed (Alternator) | Belt |
| 3824469 | fuel pump gear puller | Fuel pump |
| DM-3801372 | Gasket Set - 6BT 5.9 | Gasket |
| FP-3901356 | Turbo Charger Mounting Gasket | Gasket |
| FP-3926760 | Gasket, Oil Cooler Core | Gasket |
| FP-3928493 | Gasket, Rear Cover | Gasket |
| FP-3929792 | Gasket, Filter Head | Gasket |
| FP-3937706 | Turbocharger Oil Drain Gasket (H x 35) | Gasket |
| FP-3938157 | Gasket, Pick-Up Tube | Gasket |
| FP-3938158 | Gasket, Air Intake Connection | Gasket |
| FP-3939258 | Gasket, Fuel Transfer Pump Mounting | Gasket |
| FP-3959052 | Gasket, Oil Pan | Gasket |
| FP-6B59PREM | 6B/6BT5.9 In-Frame Kit w/upper gasket set & oil pan gasket | Gasket |
| FP-6B59PREML | 6B/6BT5.9 In-Frame Kit w/upper gasket set & oil pan gasket (late) | Gasket |
| FP-IFK6B59PREM | 6B/6BT5.9 In-Frame Kit w/upper gasket set & oil pan gasket | Gasket |
| FP-IFK6B59PREML | 6B/6BT5.9 In-Frame Kit w/upper gasket set & oil pan gasket (late) | Gasket |
| 3822509 | Injection Pump Bore Brush Service Tool | Injector |
| 3823276 | injector bore brush | Injector |
| DM-3029551 | Fuel Injector - 6BT 5.9 | Injector |
| LF3349 | Lube, Full-Flow Spin-On | Oil filter |
| 3377259 | bosch timing tool (ve) | Service part / kit |
| 965-0520 | Cooling Fan | Service part / kit |
| DM-3802010 | Main Bearing Set Standard - 4BT 3.9, 6BT 5.9, 6CT 8.3 | Service part / kit |
| FP-3356970 | 6B/6BT5.9 In-Frame Kit (contains FP-3802160 Piston Kit) | Service part / kit |
| FP-3356971 | 6B/6BT5.9 In-Frame Kit (contains FP-3802248 Piston Kit) | Service part / kit |
| FP-3903575 | Kit, Solenoid 12 Volt | Service part / kit |
| FP-3903576 | Kit, Solenoid 24 Volt | Service part / kit |
| FP-3910739 | Bearing, Ball (Fan Drive) | Service part / kit |
| FP-3918428 | Plunger, Pressure Regulator | Service part / kit |
| FP-3957544 | Element, Oil Cooler | Service part / kit |
| GM12641 | Safety/locking agent | Service part / kit |
| GM12657 | Dipstick | Service part / kit |
| GM12676 | Cylinder liner | Service part / kit |
| GM12678 | Screw plug | Service part / kit |
| GM12697 | Torx-head bolt | Service part / kit |
| GM12921 | Hexagon bolt | Service part / kit |
| GM12924 | Rear end cover | Service part / kit |
| GM12936 | Wrapped bearing bush | Service part / kit |
| GM12937 | Wrapped bearing bush | Service part / kit |
| GM12954 | Dipstick | Service part / kit |
| GM12970 | Compression spring | Service part / kit |
| GM13175 | Pipe clamp | Service part / kit |
| TB1-6 | Control box terminal (TB1-6) | Service part / kit |
| TB1-7 | B+ OUTPUT | Service part / kit |
| DM-3805401 | Oil Pump - 6BT 5.9 | Pump |
| DM-3805403 | Water Pump - 4BT 3.9, 6BT 5.9 | Pump |
| FP-3286277 | Water Pump | Pump |
| FP-3928143 | Pump, Fuel Transfer | Pump |
| FP-3970880 | Pump, Fuel Transfer | Pump |
| FP-4939587 | Pump, Lubricating Oil | Pump |
| FP-4947710 | Pump, Fuel Transfer | Pump |
| 509-0266-02 | Ring, O | Seal |
| FP-3883284 | Seal, O-Ring, Air Intake Connection | Seal |
| FP-3900808 | Seal, Injector | Seal |
| FP-3903380 | Seal, Banjo Connector (Fuel Manifold) | Seal |
| FP-3906659 | Seal, Injector | Seal |
| FP-3906698 | Seal, Rectangular Ring | Seal |
| FP-3909356 | Seal, Injector | Seal |
| FP-3909397 | Seal, O-Ring | Seal |
| FP-3909410 | Seal, Rear Service Kit (Dry Clutch Housing) | Seal |
| FP-3913994 | Seal, O-Ring | Seal |
| FP-3921640 | Seal, Valve Stem (Intake & Exhaust) (For Engines Built Before April 2003) | Seal |
| FP-3931824 | Seal, O-Ring, Turbo Oil Line | Seal |
| FP-3937111 | Seal, Front Service Kit | Seal |
| FP-3957912 | Seal, Valve Stem (For Engines Built After April 2003) | Seal |
| GM12667 | Sealing ring | Seal |
| S103 | Selector switch | Switch |
| DM-3015282 | Thermostat 180F - 4BT 3.9, 6BT 5.9 | Thermostat |
| FP-3802273 | Kit, Thermostat (83° C), (181° F) | Thermostat |
| FP-3917324 | Assembly, Thermostat (83° C), (181° F) | Thermostat |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
The Cummins/Onan 6B T5.9-G Configuration No. D402012GX02 powers 4 generator set(s), including Cummins/Onan 45MDGDC, Cummins/Onan 55MDGDC, Cummins/Onan 60MDGDD, Cummins/Onan 70MDGDD.