Well Service Pump Crankshaft

As the leading crankshaft manufacturer in China, Dawopu machines the crankshafts with high-quality durable and forged alloy steel, precise machining, 

and quality heat treatment ensures a longer service life than our competitors. The customers can easily balance and mount the crankshafts to the power 

frame with four cylindrical roller bearings.

The mud pump crankshaft assembly, made from high-nickel-modified 4340 material with high chromium content, ensures reduced noise and vibration, 

preventing corrosion and extending the bearings’ lifespan

The mud pump crankshaft assembly is designed to enhance the durability and efficiency of mud pumps used in oil and gas drilling operations. Manufactured from high-nickel-modified 4340 material, the crankshaft features high chromium content to prevent corrosion. This material selection helps minimize the initiation and propagation of cracks, ensuring the crankshaft’s longevity and reliability.

Our crankshafts are statically balanced to ensure smooth operation, reducing noise and vibration. This balance extends the service life of the bearings and the crankshaft. The assembly includes precision-machined small and large gears made from materials similar to the crankshaft. These gears feature high-precision double helical teeth with minimal backlash, ensuring efficient power transfer across the entire gear width and preventing hammering effects during speed changes.

pecifications Table

Key features:

• High-Nickel Modified 4340 Material: Provides superior strength and resistance to crack initiation and propagation.

• High Chromium Content: Prevents corrosion, enhancing the longevity of the crankshaft.

• Static Balance: Ensures smooth operation, reducing noise and vibration.

• Precision Gears: High-precision double helical gears with minimal backlash ensure efficient power transfer and reduce hammering effects.

The crankshaft assembly converts the thrust from the piston rod into rotational torque, transforming the piston’s reciprocating linear motion into the crankshaft’s circular motion. This rotational force is then transmitted to the drive system via the flywheel, also driving the engine’s valve train and other auxiliary devices.

Our connecting rods are made from high-spec alloy steel, with precise machining to ensure proper alignment between the crankshaft and the crosshead.

The crankshaft assembly includes:

• Crankshaft Front End (or Free End)

• Connecting Rod Journals

• Main Journals

• Cranks

• Balance Weights

• Crankshaft Rear End Flange (or Power Takeoff End)

The crankshaft’s front end is equipped with a timing gear, and the rear end is fitted with a flywheel (and sometimes additional balance weights).