Cummins 6BT5.9-C120 Diesel Engine 120HP Construction Engine
Cummins 6BT5.9-C120 6-cylinder in-line diesel engine rated 87 kW (120 HP) at 2200 rpm with 5.9L displacement for excavators, wheel loaders, cranes, drill rigs and other off-highway machines.
- Home
- Products
- Construction Engines
- Cummins 6BT5.9-C120 Diesel Engine 120HP Construction Engine
What This Engine Is Built For
The Cummins 6BT5.9-C120 is a 6-cylinder in-line construction diesel engine of 5.9L with a 102 * 120 mm bore and stroke supplied by MEP Power as a complete assembly. It is rated at 87 kW (120 HP) at 2200 rpm and develops 436 N.m @ 1500 rpm. The engine is turbocharged-intercooled and water cooled. It is built at the Dongfeng Cummins Plant 6BT5.9-C120 and carries Euro I. Typical duty is excavators, wheel loaders, cranes, drill rigs and other off-highway machines; dry weight with flywheel and alternator is 432 Kg and the overall envelope is 1100mm*750mm*988mm.
Key Benefits
- Delivers 87 kW (120 HP) at 2200 rpm from 5.9L as a factory-rated assembly.
- Peak torque of 436 N.m @ 1500 rpm holds the load without downshifting or derating.
- Turbocharged-Intercooled induction with water cooling keeps charge temperature under control in continuous duty.
- Supplied to Euro I, so the unit can be registered in markets that require it.
- Dry weight 432 Kg and envelope 1100mm*750mm*988mm are published so the installation can be checked before ordering.
- Rated for continuous running up to 2000 m 6BT5.9-C120 altitude.
Application Scenarios
- 20-35 t excavator power unit replacement
- Wheel loader and grader repower
- Crawler crane and drill rig drive
- Concrete pump and batching plant drive
Who It Is For
- Excavator and loader rebuilders replacing a failed power unit
- Plant hire fleets that need machines back on rent quickly
- OEM machine builders sourcing a proven engine for a new chassis
- Quarry and earthmoving contractors running machines in dusty, high-load duty
Problems It Solves
- A machine down in the middle of a job stops the whole site, not just one asset.
- Rebuilt short blocks of unknown history fail again inside the warranty window.
- Dust, vibration and long hours at high load expose any weakness in the power unit.
- Identifying the right 6BT5.9-C120 variant from a serial number takes experience; MEP Power checks the configuration before quoting.
Specification As Published
Values below are the published data for this unit. Where a figure is not listed it was not stated by the source data sheet; ask and we will confirm before you order.
| Model | 6BT5.9-C120 |
| Type | 6 Cylinders in Line |
| Displacement | 5.9L |
| Bore x Stroke | 102 * 120 |
| Engine Configuration Number | D402056CX02 |
| Net Weight (with flywheel and alternator) | 432 Kg |
| Overall Dimension | 1100mm*750mm*988mm |
| Manufacturing Plant | Dongfeng Cummins Plant 6BT5.9-C120 |
| Rated Power/Speed | 87 kW/120HP |
| Rated Speed | 2200 rpm |
| Max Torque/Speed | 436 N.m @ 1500 rpm |
| Fuel Consumption at Rated Power | 225g/Kw.h |
| Max Continuous Running Altitude | 2000 m 6BT5.9-C120 |
| Certification | Euro I |
| Aspiration | Turbocharged-Intercooled |
| Compression Ratio | 17.3:1 |
| Electrical System (starter motor/alternator) | 12V/24V |
| Lowest Starting Temp (without auxiliary system) | -12℃ |
| Engine Cooling Fluid Volume | 9.9 L |
| Cooling Method | Water Cooled |
Technical Features
- Cylinders: 6 Cylinders in Line
- Displacement: 5.9L
- Bore and stroke: 102 * 120
- Aspiration: Turbocharged-Intercooled
- Electrical system: 12V/24V
- Compression ratio: 17.3:1
- Coolant capacity: 9.9 L
Quality Control
- Every engine is inspected by the MEP Power inspection team before it leaves the warehouse
- Engine, configuration and serial numbers are recorded and photographed for the buyer
- Genuine and OEM units are quoted separately so the buyer knows exactly what is supplied
- Warranty on genuine and OEM new engines and generator sets is one year or 1000 hours, whichever comes first; parts and repair labour are covered for quality faults inside that period.
Use and Installation Guide
- Quote the model 6BT5.9-C120 and the engine configuration number D402056CX02 when ordering so the correct variant is supplied.
- Confirm flywheel housing, SAE size and pump drive against the machine
- Transfer the machine's own wiring harness only after checking the connector layout
- Run the first 50 hours at moderate load before full-duty work
- Keep the warranty terms in mind: one year or 1000 hours, whichever comes first.
Customisation Options
- OEM and ODM builds, including your logo and company name on the unit
- Cummins engine customisation and modification to your requirement
- Mining and special explosion-proof builds
- Genuine or OEM parts specified on the quotation
How It Compares
| Compared with | What to consider |
|---|---|
| A rebuilt or used engine of the same rating | A rebuilt unit may show the same 87 kW (120 HP) on paper, but its running history is unknown and the warranty rarely covers the whole engine. |
| A larger engine in the same 6BT5.9 range | Moving up a frame size adds weight, envelope and fuel burn; specify the next size up only if the duty cycle really needs the headroom. |
| A non-Cummins engine of similar output | Parts and service for Cummins families are available in most markets, which matters more over ten years than the purchase price on day one. |
6BT5.9-C120 Questions
Is this 6BT5.9-C120 a genuine Cummins engine
What power does the 6BT5.9-C120 produce
What warranty comes with the engine
How do I confirm this is the right variant for my machine
How is the engine shipped and what payment terms apply
Other Models Buyers Compare With This One
Cummins 6BT5.9-C150 Diesel Engine 150HP Construction Engine
Cummins 6BT5.9-C150 6-cylinder in-line diesel engine rated 112 kW (150 HP) at 2400 rpm with 5.9L displacement for excavators, wheel loaders, cranes, drill rigs and other off-highway machines.
View specification
Cummins 6BT5.9-C145 Diesel Engine 145HP Construction Engine
Cummins 6BT5.9-C145 6-cylinder in-line diesel engine rated 106 kW (145 HP) at 2100 rpm with 5.9L displacement for excavators, wheel loaders, cranes, drill rigs and other off-highway machines.
View specification
Cummins 6BT5.9-C135 Diesel Engine 135HP Construction Engine
Cummins 6BT5.9-C135 6-cylinder in-line diesel engine rated 100 kW (135 HP) at 2000 rpm with 5.9L displacement for excavators, wheel loaders, cranes, drill rigs and other off-highway machines.
View specificationQuote The 6BT5.9-C120
Send your serial number or nameplate photograph and we will confirm the configuration, then price genuine and OEM options side by side.