DH370 Final Drive Sprocket Rim Assembly/Heavy-duty excavator Track chassis components manufacture/OEM quality spare parts
Product Specifications
Of course. Here is a detailed overview of the DAEWOO DH370 Final Drive Sprocket Assembly.
This is a critical component for the operation of the Daewoo DH370 excavator (also often branded as Doosan DH370 after Doosan's acquisition of Daewoo's construction equipment division).
What is the Final Drive Sprocket Assembly?
It is the complete final drive unit, more commonly referred to simply as the "Final Drive" or "Travel Motor." It's a complex assembly that serves two primary functions:
Reduction: It takes the high-speed, low-torque rotation from the hydraulic travel motor and reduces it to low-speed, high-torque rotation.
Power Transmission: It transmits this high-torque power directly to the track, propelling the excavator.
The term "Sprocket Assembly" specifically refers to the very end of this unit—the sprocket itself that meshes with the track links. However, it's almost always sold and replaced as an integrated unit with the planetary gear reduction system.
Key Components of the Assembly
A typical final drive for a DH370 consists of:
Hydraulic Motor: The core of the assembly. It converts hydraulic pressure from the excavator's main pump into rotational mechanical force.
Multi-Stage Planetary Gear Reduction: A series of planetary gear sets housed within a robust casing. This is what provides the massive torque multiplication.
Sprocket: The large, toothed wheel that directly engages with the excavator's track. It is the final output of the entire assembly.
Hub & Flange: Connects the gear system to the sprocket.
Case (Shell): The heavy-duty, sealed housing that contains all the gears, bearings, and oil. It is designed to withstand immense stress and protect the internal components from the harsh environment.
Bearings and Seals: Critical for supporting the immense load and keeping lubricating oil in while keeping dirt, water, and debris out. Failed seals are a common cause of final drive failure.
Common Applications & Compatible Models
The DH370 final drive is primarily used on the Daewoo/Doosan DH370 excavator. It's always crucial to confirm compatibility using the machine's serial number, as there can be design changes across different manufacturing years.
This excavator model is also sometimes known as the Doosan DX340 in certain markets, but you must verify parts crossover with a reliable supplier. It may also be compatible with some earlier Samsung excavator models (the predecessor to Daewoo).
Signs of a Failing Final Drive
Loss of Power or Stalling: The excavator struggles to move, especially under load or on an incline.
Unusual Noises: Loud grinding, knocking, or whining sounds coming from the track side.
Oil Leaks: Visible hydraulic oil or gear oil leaking from the final drive seal or around the sprocket.
Overheating: The final drive casing becomes excessively hot to the touch.
Track Not Moving: The hydraulic motor runs, but the sprocket does not turn (indicating severe internal failure like stripped gears).
Purchasing a Replacement: New, Aftermarket, or Rebuilt?
When replacing a final drive for a large excavator like the DH370, you have three main options:
OEM (Original Equipment Manufacturer):
Brands: Doosan (genuine part).
Pros: Highest quality, perfect fit, comes with a warranty.
Cons: Most expensive option.
Aftermarket/New Compatible:
Brands: Various manufacturers specialize in producing high-quality compatible final drives.
Pros: Significant cost savings over OEM, often very good quality and performance, includes warranty.
Cons: Quality can vary between manufacturers. It's essential to choose a reputable supplier.
Rebuilt/Remanufactured:
Process: A core (your old, broken unit) is completely disassembled, inspected, worn parts (gears, bearings, seals, motor) are replaced, and it is reassembled to meet original specifications.
Pros: Cost-effective and environmentally friendly option.
Cons: Quality depends entirely on the expertise of the rebuilder. The core usually must be exchanged.
Important Considerations Before Buying
Machine Serial Number: This is the most important piece of information. Provide it to your parts supplier to ensure you get the correct final drive assembly. A DH370 from 2005 might have a different part number than one from 2015.
Side of Machine: Final drives are side-specific (Left Hand / Right Hand). The rotation direction is critical.
Supplier Reputation: Especially for aftermarket or rebuilt units, choose a supplier with strong technical support and a solid warranty.
Core Charge: If purchasing a rebuilt unit, there will almost certainly be a core charge (a refundable fee) that is returned when you send your old, broken final drive back to the supplier.
Installation Warning
Replacing a final drive on an excavator of this size is a major repair. It involves:
Handling extremely heavy components (the final drive can weigh over 1,000 lbs / 450 kg).
Properly bleeding the hydraulic system.
Filling it with the correct type and amount of gear oil.
Precise alignment during installation.
It should only be performed by trained mechanics with the proper tools and equipment to ensure safety and correct operation.
