Kalmar DRD450-80S4X, Maintenance Manual

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UDRF01.04GB
Maintenance manual DRF 400–450
4 Brakes – 4.3 Service brake system 5
4.3 Service brake system
page –
Power-assisted brake system, function
description
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
display.
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