Mazzella Clam Bucket Assembly Rebuild Project – Seifert Engineering

August 4, 2023
CAD model of clam shell bucket on a computer, with the physical bucket behind the screen.

Seifert Technologies is proud to work with companies like Mazzella on important projects to improve their operations.  In this case, we were asked to help mechanically redesign a clam bucket assembly for a 3/4-yard clamshell. 


What is a Clam Bucket or Clamshell Bucket?


A clam bucket, or clamshell bucket, is a two-piece bucket with a hinge in the middle. The two clamshell halves open and close like a clam's shell hence the name.

Clam buckets are efficient at loading because the two shells push into the material, unlike a standard bucket that pushes the material outwards. Clam buckets are convenient because they can be operated using an overhead crane.


What are Clam Buckets Used For?


Clamshell buckets are efficient at loading because the two shells force their way into the material, whereas a standard bucket continually pushes the soil outwards. Clamshell buckets also allow trucks to self-load with a crane, freeing up site machinery for other uses. Clam buckets are used to pick up small items and can be attached to a variety of machines. They are often used in construction, landscaping, and agriculture.


Clamshell buckets have a wide jaw that opens to 180 degrees and a thick cutting edge that closes it tightly. They can be used for material loading and dumping, cleaning up dirt and sand, and even use as a grapple to handle refuse.

Clamshell buckets are well suited for larger civic projects or making applications that require moving significant loads. They are also suitable for gardening, landscaping, and agriculture machines.


Who is Mazzella?


Mazzella is one of the largest independently owned companies in the overhead lifting and rigging industry.  a company that manufactures and distributes lifting products for industrial, commercial, and specialty applications. Founded in 1954, Mazzella is headquartered in Cleveland, Ohio, and has over 30 locations throughout North America.


Mazzella provides a wide range of lifting products, including:

  • Cranes,
  • Crane service
  • Wire rope
  • Engineered lifting devices
  • Rigging hardware
  • Slings
  • Training
  • Warehousing
  • Metal roofing.

Mazzella also provides replacement parts for cranes, crane repair, OSHA compliance inspections, and training. Learn more about them on their website HERE

Seifert Technologies Scope of Work:

Grey CAD model of a clam shell bucket.

Our engineers retrieved all the pertinent information for the 1 cubic yard clamshell that was provided by the Mazzella company.  They were able to supply previous CAD drawings along with any of the documented loading information.  The Seifert Technologies Engineering department then modified the original design using Autodesk Inventor and verify the structural integrity of the design’s frame weldments.


Then, our team designed a new upper section of the clamshell consisting of the base and the side frames. To improve the functionality of the original design. We also specified a new foot-mounted gearcase as well as a larger motor with brake assembly. 


CAD drawing of clamshell isometric closed

Once the engineering team at Seifert Technologies was finished specifying the purchased components, we then focused on designing a new ¾ & 1-yard bucket that would be able to attach to the upper structure by only changing out the pins. The electrical portion of this project was completed by Mazzella.


By using extensive analysis on the design level, we were able to keep fabrication costs to a minimum.  We were also able to keep the resulting fabrication to a common componentry between 3/4 and 1-yard clamshells. 


"I have been working with Seifert Engineering for 25 years. As both a manufacturer using Seifert Engineering Drawings, and as a customer having Seifet Engineering provide engineering and drawings. Seifert has always delivered a quality project professionally and timely." - Cylde Shetler, Project Consultant/ Process Crains and Modernizations, Mazzella




The team at Mazzella was part of the entire redesign process and met on a bi-weekly basis. Together Seifert’s Engineering team and the team at Mazzella were able to improve operations and update the design of the clamshells. We are always excited to work with a great team like Mazzella and look forward to future projects.

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