Dry bulk materials can form lumps or agglomerations that are too large to move effectively through downstream equipment. A lump breaker reduces these oversized pieces to a more manageable size before the material enters conveying or other processing equipment.
By addressing lumps at the point where they enter the process, a lump breaker can help maintain material flow, reduce interruptions, and support more consistent downstream operation.

Hapman LumpMaster® lump breakers use a low-speed, high-torque design to shatter lumps against stationary outer combs. The compact, low-profile design also makes the LumpMaster well suited for integration into existing equipment stacks where available space may be limited.
Integrate the LumpMaster® with other bulk material equipment from Hapman like the Bulk Bag Unloader, Bag Dump Stations, or Bulk Bag Filler for a complete material handling system.
Our Performantee is a 100% operational guarantee that you will be fully satisfied with the performance of our equipment, and that it will achieve the specific results for which it was designed and manufactured. If not, we will revise or repair it to deliver the results we promised.

Each component is built to break down compacted material and keep it moving to the next step in your process.
Chassis
Available in stainless steel or carbon steel.
Combs
Rotating shaft pins machined from stainless steel or carbon steel.
Drive
60:1 gear reduction delivers low-speed, high-torque operation.
CUSTOM
Combs can be machined from solid 316 stanless steel for a more robust design.
Profile
Low-profile construction minimizes stack height for easier integration into existing equipment.
Every LumpMaster is configured around your material and process. Use the ranges below as a starting point, then talk with our team to size the right unit for your application.
| Model | Volume | Particle Size |
|---|---|---|
| 12 inch | Up to 4 CFM | Approx. ¾” |
| 18 inch | Up to 9 CFM | Approx. ¼” |
| 24 inch | Up to 16 CFM | Approx. 1” |
Hapman’s engineering team has helped customers with lump breaker applications in the following industries:

Use the Hapman Configurator for on-demand access to design custom solutions for your application and immediately obtain reference models and drawings.
Want to see why LumpMaster is the best fit for your product? We can also run sample testing on certain materials. Get in touch with our team to customize your specs to exactly what you need.
Want to talk to a technical specialist about your specs for a size reduction machine?
What is a lump breaker?
A lump breaker is a size reduction machine used to break apart lumps and agglomerations in dry bulk materials. It reduces oversized material to a more manageable size so it can move effectively through downstream conveying and processing equipment.
How does a lump breaker work?
Material enters the lump breaker and passes through rotating shaft pins that reduce oversized lumps against the outer combs. The LumpMaster® uses a 60:1 gear reduction to provide low-speed, high-torque operation as material moves through the unit.
What size does a lump breaker reduce material to?
The LumpMaster® is designed to reduce lumps to approximately ¾ inch. The 24-inch unit reduces lumps to approximately 1 inch. Final results will depend on the material and application.
What types of materials can a lump breaker handle?
Lump breakers are built for dry bulk materials that were once free flowing but have clumped or agglomerated over time, often from moisture, pressure, or long storage. The LumpMaster breaks up those lumps and returns the material to a flowable state, so it moves smoothly into your next process. It’s not intended for gummy, sticky, or wet materials.
What is the difference between a lump breaker and a crusher?
A lump breaker is designed to reduce lumps and agglomerations to a manageable size for downstream material handling. A crusher typically performs more aggressive size reduction when the process requires material to be reduced beyond simply breaking apart oversized lumps or agglomerations.
Where can a lump breaker be installed in a material handling system?
A lump breaker can be integrated into a material handling system ahead of downstream equipment that requires oversized lumps to be reduced. The LumpMaster® can be incorporated with Hapman conveying and dust collection equipment as part of an integrated material handling system.
How is safety addressed when integrating a lump breaker?
LumpMaster® lump breakers are designed to operate as part of a complete material handling system, so safe access must be addressed through the design of the surrounding equipment. Depending on the system, this may include restricting access to the LumpMaster or using interlock controls to prevent access during operation.
Because material must enter and discharge freely, guarding cannot interfere with the material flow path. Safety requirements are therefore evaluated as part of the overall system design.
Can a lump breaker be added to an existing material handling system?
Yes. The LumpMaster® has a compact, low-profile design specifically intended to support retrofits into existing equipment stacks where available vertical space may be limited.