The mouth set in a 2-26 rotary hammer, also known as the tool holder assembly or chuck assembly, is a critical component used to hold and secure the drill bit or chisel in place during operation. It allows for the easy insertion, locking, and removal of different types of bits used for drilling or chiseling.

Here’s how the mouth set functions in the rotary hammer:

Holds Drill Bits/Chisels Securely: The mouth set is the part where you insert your drill bit or chisel. It ensures that the bit is firmly held in place, preventing it from slipping or coming loose during operation. For SDS-plus hammers like the 2-26, this part is designed to work with SDS-plus bits, which can be easily locked in with a simple push and twist mechanism.

Quick Bit Changes: One of the advantages of the mouth set in rotary hammers is the ability to quickly change bits without the need for additional tools. This makes it more efficient to switch between different drilling or chiseling tasks on the job.

Absorbs Impact: The mouth set also plays a role in absorbing some of the impact generated during the hammering action, protecting the machine and the user. It ensures that the force is effectively transferred to the bit without damaging the machine’s internal components.

Protects Internal Components: By securely holding the bit, the mouth set ensures that the forces from drilling and hammering are directed outward into the material (concrete, masonry, etc.) rather than affecting the internal components of the hammer, such as the motor or gears.

If the mouth set is worn or damaged, the rotary hammer may have trouble holding bits securely, leading to reduced efficiency or difficulty in drilling/chiseling.