Friction Materials Identification
Disc Pads with Sintered Linings
Disc Pads with Sintered Linings

Kor-Pak is uniquely qualified to meet the needs of those with specialty friction material requirements.

To properly identify the type, of friction used on various bands and clutches, it is necessary to understand the function each performs. The basic mechanism in all cabs is the same regardless of the type of boom used. The driving power may be gas, diesel, electric or steam. Brakes may be internal expanding or external contracting. Clutches may be band type or facing.  In most cases they are known by the duty they perform. A band type clutch is known as the “friction”; the brake as the “brake”.

SWING FRICTIONS:
These frictions, often called swing clutches, are used to rotate the super-structure of shovels, cranes and draglines to any desired working position.
They may be of the external contracting or internal expanding band type; internal expanding self-energizing shoe type; single or double cone construction; or disc type. Since the digging cycle of all modern machines has been materially speeded up, resulting in severe usage, swing frictions are relined more frequently than other frictions on a machine.

SWING BRAKE:
The application of brakes to hold super-structures in position has never been very successful except on light equipment. On some of the smaller machines, automatic brakes have proved to be fairly successful. In most operations when swinging to right or left of the swinging motion must be stopped by using the opposite swing friction.

HOIST FRICTION:
The hoist friction is the Iarge power clutch used for hoisting the bucket when digging and then lifting the loaded bucket so that it is free to swing. The friction, either of the internal expanding or external contracting band type, may be operated by manually controlled levers or by hydraulic, air, vacuum or mechanical boosters.

HOIST BRAKE
The hoist brake, on the same shaft as the hoist friction, is used to hold the spooling drum and bucket in a definite position, particularly while swinging. The brake is usually an external contracting band type.
BOOM FRICTION:
A small independent friction which is used for raising the booms to suit digging conditions. Since this friction is
infrequently used, the frictional material problem is of minor importance.
BOOM BRAKE:
In conjuction with the boom hoist friction, there is a locking brake which simply holds the hoist in position. This brake is of the external contracting band type.

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