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BRACKET 0878493 - Caterpillar

0878493 BRACKET Caterpillar parts BRACKET
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Caterpillar 0878493 BRACKET

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Illustration 1 g03717281
Final Drive Cross Section With Parking Brake Released (1) Brake piston (2) Brake piston chamber (3) Brake springs (4) Disks and plates (5) Brake couplingThe parking brakes are spring applied and hydraulically released. These wet brakes are engaged through the compression of a series of disks and plates (4). The disks are splined to brake coupling (5). The plates are splined to the housing. The brake is splash lubricated.Oil from the auxiliary hydraulic pump is used in order to release the parking brakes. When the brakes are engaged, the brake solenoid opens brake piston chamber (2) to the hydraulic tank. Brake springs (3) move brake piston (1) against brake disks and plates (4). This action compresses the disks and plates, so brake coupling (5) cannot rotate.When the brakes are released, auxiliary pressure is directed into brake piston chamber (2). Auxiliary pressure acts against brake piston (1). This action is in opposition to brake springs (3). The auxiliary pressure overcomes the force of the brake springs, and the brake piston moves. This movement releases the compressive force on disks and plates (4).

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