Service Brake System - Kalmar DRF420-60S5 Maintenance Manual

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4 Brakes – 4.3 Service brake system

Service brake system

Power-assisted brake system, function

The power-assisted brake system consists of a brake oil tank, brake

oil pump, brake oil filter, accumulator charging valve, accumulators,

brake valve, pressure sensors, brake cylinder and wheel brake units.

The brake oil pump pumps oil (from tank) which is cleaned in the oil

filter. The accumulator charging valve directs pressure to the accu-

mulators that store pressure or direct the oil through the wheel

brake for cooling of the brake discs. The brake valve directs pressure

from the accumulators to the brake cylinder. The brake cylinder

compresses the discs in the brake units that brake the machine.

Make-contact brake pressure gives a signal so that the brake lights

are activated when the brake cylinder is pressurized.

When the accumulators are charged, the accumulator charging

valve controls oil through the drive axle's brake units and cools the

brakes. The oil passes through the cooler back to the tank. An elec-

tric cooling fan increases the air flow through the cooler when the

temperature needs to be lowered. A thermal by-pass valve leads the

oil past the cooler if the oil's temperature is low. The temperature

sensor controls activation of fan and temperature warning on the

Maintenance manual DRF 400–450

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