Mobile cranes

• Pages: 61-66

5. Mobile cranes1

5.1. Outriggers

5.1.1. Where a mobile crane is fitted with outriggers

when in use, the outriggers should be fully extended and locked

in position;

the jacks should be extended sufficiently to take the load fully

off the wheels; and

unless the crane is on firm ground such as concrete, the jacks

should rest upon adequate packing.

5.2. Ballast

5.2.1. In cases in which the amount of ballast fitted to a mobile

crane depends upon the length of the jib, measures should be taken

to ensure that the crane has been properly ballasted before use.

5.3. Jibs or booms of variable length

5.3.1. Tn cases in which a mobile crane is fitted with a jib or

boom of a length that can be varied by the insertion or removal of a

jib or boom section, the following precautions should be taken when

the jib or boom is lowered for its length to be changed:

where necessary, the automatic safe load indicator provided in

accordance with the requirements of section 5.7 should be dis-

connected;

the jib or boom should be lowered along the fore-and-aft axis of

the crane and deposited upon a sufficient number of blocks each

of adequate strength and suitably spaced; and

1The provisions of this chapter, in addition to any applicable provisions of

Chapter 4, apply to all mobile cranes.

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