What is the pitman assembly?

If you work with jaw crushers, you have likely heard the term Pitman Assembly (or moving jaw assembly). But what exactly is it, and why does it matter? In this short guide, we will break down the basics and show you the full range of pitman assemblies we offer.

What is a Pitman Assembly?

The pitman assembly is the moving part of a jaw crusher. It houses the pitman (the main body), the jaw dies, jaw crusher toggle plate, and bearings. As the eccentric shaft rotates, the pitman moves back and forth, crushing material against the fixed jaw. It is the heart of the crushing action – without a robust pitman, your crusher can not perform.

Key Components of a Pitman Assembly

• Pitman body : The main structure that transfers crushing force.
• Eccentric shaft: Drives the pitman’s reciprocating motion.
• Bearings: Ensure smooth rotation of the eccentric shaft.
• Bearing housings: Support and protect the bearings.
• Labyrinth seals: Prevent dust and dirt from entering the bearings.

What are the parts included in the pitman assembly?
Eg：C125 ONA-910869

Why It is Critical ?

The pitman assembly directly affects:

• Crushing efficiency: A worn pitman reduces output and increases energy consumption.
• Maintenance costs : Regular inspection and timely replacement prevent breakdowns.
• Product quality : Proper pitman movement ensures consistent particle size.
  
  

How to Choose the Right Pitman Assembly

Match the assembly to your crusher model. Consider:

• Material: High manganese steel for durability, or alloy steel for extra strength.
• Manufacturing process: Casting vs. forging.
• Precision: OEM spec dimensions guarantee perfect fit.
  
  

Our Full Range of Pitman Assemblies

We stock pitman assemblies for most popular jaw crusher models. All are manufactured to strict standards, ensuring long life and reliable performance. 

The following is a list of the main pitman assemblies suitable for Metso and Sandvik jaw crushers:

Why Choose Us?

• Quality assured: Each assembly is tested before shipping.
• Fast delivery: Large inventory means quick turnaround.
• Competitive pricing: Factory‑direct savings.
• Technical support: Our experts help you select the right part.
  
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  All names, marks, models, symbols and descriptions are used for reference purposes only and it is not impied that any of the parts/brands listed are the product of any company other than ONA. We are not agents or distributors for any of the above mentioned brands nor do we have any commercial relationship or association with them.