Cobra 4400 Instructions d'exploitation télécharger pdf (Page 20)

6.3.3Relief valve

The main relief valve is on the control valve and limits the maximum working pressure.

6.3.4Pilot operated holding valves

These valves are installed on every cylinder and will stop and lock every motion of the cylinder should any

pressure loss occur. Before starting operations it is necessary to check that these valves are perfectly

working, as follows:

• lift a load and raise the boom up to an angle of 45° upwards, with the boom sections partially extended

• switch the truck engine off push and pull repeatedly all the control switches: the load must remain still.

6.3.5Safety devices’ sealing

Some safety devices or crane components can be sealed after setting during testing operations.

Such sealing can be only removed by the manufacturer or by an authorized workshop who will carry out a

new sealing after repairing according to Manufacturer’s specifications.

DANGER

The removal of sealing by non authorized personnel, or a sealing not complying to manufacturer

specifications results in an improper usage of the crane.

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Cobra 4400 Instructions d'exploitation Page 20