824K Wheel Dozer, 825K Soil Compactor and 826K Landfill Compactor Machine Systems Caterpillar


Piston Pump (Brake Charging)

Usage:

826K 232


Illustration 1g03662577

The brake/pilot pump (1) is a variable displacement pump that provides oil to the brake combination valve and pilot oil to the steering and implement hydraulic systems via the brake combination valve. The brake/pilot pump is attached to the steering pump (2) on the right side of the machine below the cab. The brake/pilot pump replaces the fixed displacement pump on the H Series machines. The pump compensator valve (3) controls the oil flow to the brake combination valve. When pressure in the brake system is less than approximately 16000 ± 350 kPa (2320 ± 50 psi), the compensator valve keeps the swashplate at maximum angle. The pump piston stroke is longest and pump displacement is maximum. As the brake system pressure increases above 16000 ± 350 kPa (2320 ± 50 psi) the pressure compensator decreases the angle of the swashplate and the pump displacement. The amount of oil per pump revolution is decreased to the amount needed to maintain the system pressure at 16000 ± 350 kPa (2320 ± 50 psi).

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