HIAB 335K HiPro CD CE Manuel de l'opérateur - Page 13

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2.5

Operating system - hydraulic

components

The operating system consists of the following

hydraulic components:

• oil tank

• hydraulic pump

• oil cooler [option on some cranes]

• main control valve

• stabiliser control valve [option on some

cranes]

• hydraulic hoses and lines

• actuators:

first boom cylinder

second boom cylinder

extension cylinder/s

slewing cylinders / motor reducers

• return filter

• pressure filter [option]

2.6

All cylinders are equipped with load-holding

valves as a safety device. After a crane move-

ment they hold the crane in position, also in the

unlikely event of a burst hose.

If there is a leak or a component fractures, such

as a pipe, hose or a coupling, the load-holding

valves will stop the booms from collapsing down,

even when the hydraulic system is switched off,

and you operate a particular crane function.

To operate a hydraulic cylinder equiped with a

load holding valve, an opening pressure is re-

quired.

Structure and parts of the HIAB crane

Operator's Manual GB

2.5