4BT Diesel Engine 3.9L Displacement 100–150HP Power Range for Excavator Dedicated Applications

The 4BT excavator dedicated version is upgraded based on the mature B-series diesel platform, specially reinforced for excavator frequent start-stop, variable heavy load, and high-dust construction site working conditions.

Equipped with thickened cast iron cylinder block, forged heavy-duty crankshaft, mechanical VE rotary fuel pump without electronic sensors, and matched fixed geometry turbocharger.

• 4BT3.9-C100 (100HP): For 6–7.5 ton mini excavator, low fuel consumption for municipal small earthwork
• 4BTA3.9-C125 (125HP): Mainstream 9–12 ton medium excavator, strong low-speed torque for digging & rock breaking
• 4BTA3.9-C150 (150HP): For 12–13 ton heavy-duty digger, sufficient power for continuous heavy excavation and loading

• Side-mounted cooling fan bracket matching excavator radiator layout
• Built-in hydraulic PTO port to drive main hydraulic pump
• Reinforced shock-resistant engine mounting feet
• Large flywheel housing matched with excavator hydraulic pump transmission interface

Fully mechanical design reduces breakdown rate on harsh construction sites, adapts to low-grade diesel fuel, and is widely used as aftermarket replacement power for second-hand medium-small excavators globally.

Replacement fit for 6–13 ton hydraulic excavator chassis compatible with excavator-dedicated 4BT powerplant. Reference production year range: 1998–2020

• For Sany SY75 / SY95 / SY115 / SY135 excavator chassis
• For Liugong LG6085 / LG6090 / LG912 medium digger chassis

• For Komatsu PC60-7 / PC120-6 / PC130-7 chassis
• For Hitachi EX60 / EX120 excavator chassis
• For CAT 307 / CAT 312 small-medium excavator chassis

• Small rotary drilling rig, mobile hydraulic power unit chassis

If you need other engine assemblies, bare engine blocks, gearboxes, or other auto spare parts, you are welcome to search on our website or contact us directly.

We carry a full series of Japanese and American gasoline & diesel engines, covering trucks, passenger cars, household vehicles, and excavator construction machinery.