ENSURING CRANE IS STABLE

Standard Hand Signals - TM-5-3810-306-10_60

EXERCISE EXTREME CAUTION AND PRUDENT JUDGEMENT WHENEVER ELECTROCUTION HAZARDS EXIST - OPERATE SLOWLY AND CAUTIOUSLY

TM-5-3810-306-10 Container Crane 40-Ton Rough Terrain Model RTB75CC Manual
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TM 5-3810-306-10 Sheaves, guards, guides, drums, flanges and other surfaces that come in contact with rope should be inspected for conditions that could cause possible damage to rope. Inspect the boom nose and hook block sheaves for wear. Damaged sheaves cause rapid deterioration of wire rope. USE ENOUGH PARTS OF LINE FOR HEAVY LIFTS AND CHECK ALL LINES, SLINGS AND CHAINS FOR CORRECT ATTACHMENT. To obtain maximum lifting capacities, hook block must be set up with enough parts of line. NO LESS THAN ONE LAYER of wire rope should remain on hoist drum. When slings, ties, hooks, etc., are used, make certain they are correctly positioned and secured before raising or lowering the loads. Ensure the wire rope is properly routed. If not properly routed, notify Organizational Maintenance. Two-blocking MUST BE AVOIDED to prevent damage to the crane and to avoid creating a safety hazard. Two- blocking occurs when the hook block, overhaul ball, rigging, etc. contact the boom nose or auxiliary boom nose. Two-blocking can damage the wire rope rigging, reeving, and other crane components. These parts become highly stressed and overloaded until the wire rope fails allowing load, block, etc. to free fall. WARNING The crane is equipped with an anti-two- block warning system. Ensure that anti- two-block pins are removed prior to operating the crane. Failure to follow this procedure could result in personal injury and equipment damage. When lowering or extending the boom let out cable to prevent two-blocking the boom nose and the hook block. The closer the load is carried to the boom nose, the more important it becomes to let out cable as the boom is lowered. Keep hook block, etc. at least 12 inches (30.48 cm) away from boom nose at all times. ENSURING CRANE IS STABLE Ensure crane is stable before lifting a load. Ensure outriggers (or tires if lifting on rubber) are placed firmly on solid ground. Ensure crane is level, brakes are set and load is properly rigged and attached to the hook block. Lift load slightly off the ground then recheck stability before proceeding with the lift. Wind and other factors such as boom length, boom angle, size and weight of load being lifted, etc. can affect crane stability. You should establish safe working loads for each job depending on conditions that exist at the time. Capacity reductions shall be made when conditions indicate the crane could be damaged or become unstable. Be cautious if the wind speed reaches 20 miles per hour. KEEP THE BOOM SHORT Swinging loads with the boom extended can cause boom damage and an unstable crane. ELECTRICAL HAZARDS Read and observe the WARNING plates posted in and on the crane. Crane operation is extremely dangerous when close to an electrical power source. Use extreme care when operating near an energized power source or power lines. Assume all power sources are hot. When operating near power lines, have the power company cut off the power and ground the lines. 2-37

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