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Subchapter 7. General Industry Safety Orders
Group 13. Cranes and Other Hoisting Equipment
Article 94. Hydraulic Cranes and Excavators

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§4949. Boom Hoist and Supporting Mechanism.

(a) The boom hoist shall be capable of elevating and supporting the boom and 110% of rated load without attention from the operator and allow lowering to rated radius only when under operator's control.

(b) A holding device shall be provided.

(1) On rope boom support machines a ratchet and pawl or other positive locking device shall be provided to prevent unintentional lowering of the boom.

(2) For hydraulic cylinder boom support machines, a holding device (such as load checks) shall be provided to prevent unintentional lowering of the boom.

(c) Minimum ratio of boom hoist drum and sheave pitch diameters to nominal rope diameters shall not be less than 15 to 1.

(d) On a telescoping boom, the retract function shall be capable of controlling 110% of rated load. A holding device (such as load check) shall be provided.

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.


1. Amendment filed 8-29-86; effective thirtieth day thereafter (Register 86, No. 39).

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