16.J Lattice, Hydraulic, Crawler-, Truck-, Wheel-, and Ringer-Mounted Cranes.
16.J.01 For required operator aids and indicating devices, see Section 16.E.03.
16.J.02 Boom assembly and disassembly.
This operation must be covered in the AHA and CP must be identified.
- The manufacturer's boom assembly and disassembly procedures must be reviewed by the team before starting the assembly or disassembly. The CP must be present during assembly/disassembly operations.
- When removing pins or bolts from a boom, workers must stay out from under the boom. Sections must be blocked, cribbed, or otherwise secured to prevent them from falling.
- Blocking, cribbing and other means of securing must be confirmed, verified and approved by a CP before assembly/disassembly operations are allowed to proceed.
16.J.03 Outriggers.
- Anytime outriggers are required to be used, they must be extended or deployed per the crane manufacturer's load/capacity chart specifications, except for locomotive cranes.
- When partially extended outriggers are used, the following requirements must be met:
- (1) Crane operation with partially extended outriggers must only be undertaken if approved by the crane manufacturer;
- (2) Outriggers must be set at equal positions that correspond to the load/capacity charts supplied by the manufacturer for those positions. Only the load chart(s) corresponding to the outrigger positions must be used for operation;
- (3) When situations arise where outriggers must be set at unequal positions that correspond to the load/capacity charts corresponding with the individual quadrants of operation. The manufacturer or QP must be consulted to determine if the capacity reductions, special operating procedures, or limitations are required;
- Outrigger floats must be securely attached to the outriggers.
- Blocking/pads under outrigger floats must meet the following requirements:
- (1) Sufficient strength to prevent crushing, bending, or shear failure;
- (2) Such thickness, width, and length as to completely support the float, transmit the load to the supporting surface, and prevent shifting, toppling, or excessive settlement under load. The blocking area size and thickness must be based on additional items such as soil conditions, soil type, compaction, liquid limits, underground utilities, crane type and capacity, and having the crane within 1% of level.
16.J.04 Unless the manufacturer has specified an on-rubber rating, mobile cranes must not pick or swing loads over the side of the crane unless the outriggers are down and properly extended.
16.J.05 Unless recommended against by the manufacturer, crane booms must be lowered to ground level or secured against displacement by wind loads or other outside forces when not in use. If the manufacturer recommends against this practice, the manufacturer's recommended practice must be followed.
16.J.06 When pick and carry operations occur (Rough Terrain Cranes), the boom must be centered over the front of the crane, the mechanical swing lock engaged, and the load restrained from swinging.
Knowledge Check Choose the best answer for the question.
16-15. When removing pins or bolts from a boom, workers must _____ .
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