Tower Cranes
Operational Aids
Different operational aids than those specified in Section 1416 are required for tower cranes.
Boom angle indicators are required for tower cranes Photo courtesy of Link-Belt Cranes
Those required on tower cranes are:
- trolley travel limiting device at both trolley end stops
- boom hoist limiting device that limits the range of the boom at the minimum and maximum radius
- anti two-blocking device
- hoist drum lower limiting device on tower cranes (manufactured after November 8, 2011)
- load moment limiting device
- hoist line pull limiting device
- rail travel limiting device
- boom hoist drum positive locking device and control
- boom angle or hook radius indicator readable from the operator's station (required on all luffing boom tower cranes and on hammerhead tower cranes manufactured after November 8, 2011)
- trolley travel deceleration device
- boom hoist deceleration device
- load hoist deceleration device
- wind speed indicator
- load indicating device on tower cranes (manufactured after November 8, 2011)
As with operational aids on other equipment, tower cranes may be operated for limited amounts of time with malfunctioning aids as long as the temporary alternative measures specified in the standard are taken.
Knowledge Check Choose the best answer for the question.
7-3. As long as the temporary alternative measures specified in OSHA 1926.1435 are taken, tower cranes with malfunctioning aids may _____.
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