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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.
(e) Friction mechanisms. Where friction mechanisms (such as brakes and clutches) are used to control the boom hoist or load line hoist, they shall be:
(1) Of a size and thermal capacity sufficient to control all rated loads with the minimum recommended reeving.
(2) Adjustable to permit compensation for lining wear to maintain proper operation.
(f) Hydraulic load hoists. Hydraulic drums shall have an integrally mounted holding device or internal static brake to prevent load hoist movement in the event of hydraulic failure.

Credits

Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
History
1. Amendment filed 8-29-86; effective thirtieth day thereafter (Register 86, No. 39).
2. New subsections (e)-(f) filed 7-26-2022; operative 7-26-2022 pursuant to Government Code section 11343.4(b)(3) (Register 2022, No. 30). Filing deadline specified in Government Code section 11349.3(a) extended 60 calendar days pursuant to Executive Order N-40-20 and an additional 60 calendar days pursuant to Executive Order N-71-20.


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