20.1 Take-Up, Trial Lift and Load Control

Establish readiness before taking weight

A trial lift takes up rigging and raises the load only enough to check the approved arrangement, balance and control. It is an operational check, not permission to use unverified weight or damaged equipment. Calculated forces and capacity checks must be complete before the crane or hoist supports the load.

Confirm load identity, weight, CG, lifting points, assembled components and the planned destination. Check that the chosen hitch captures the load without slipping and that all necessary pins, locks and retaining devices are installed. Ensure any loose parts are removed or secured. The crane operator must verify capacity in the actual configuration and at the planned radii.

A component may be within WLL yet incorrectly connected. Look for a twisted chain leg, a sling eye crowded on a hook tip, a shackle side load or an adjustable connection that cannot articulate as intended. Check the full force path from crane hook through the rigging to the load, including any hoist, beam or below-the-hook device.

Brief and position the team

Use the agreed signals and identify the ordinary signal source for each crane. Test radio communication on site; the operator's reception must be hands free under OSHA 1926.1420. Establish signal handoffs and the stop response before the load hides a view or moves behind a structure. Anyone may communicate a stop or emergency stop for safety.

Position workers outside the planned fall, swing and crush areas. OSHA 1926.1425 specifies limited fall-zone access for hooking, unhooking, guidance or initial connections, with the required conditions including qualified rigging and appropriate self-closing hook latches or equivalent. Only needed receiving workers may be in the fall zone during landing. These exceptions do not permit standing beneath a tilt-up or tilt-down load.

Check that the load is free of bolts, welds, anchors, ice or other restraints that were supposed to be released. A crane must not be used to discover an unknown restraint by pulling harder. Confirm workers removing restraints have cleared the hazard area before tension is applied.

Controlled take-up

Bring the hook into its planned position, normally over the intended resultant and CG for the approved arrangement. Take up slack slowly while the load remains supported. Observe sling seating, protection, locks and component orientation from a safe location. Keep hands out of the space between tightening sling and load.

Do not adjust a loaded sling by pulling its eye with a hand, climb onto the load or tighten a suspect pin while suspended. Land or fully unload into stable support before correction. A successful correction must be checked again through the same readiness sequence.

The low lift

Raise only to the planned clearance required for assessment. There is no universal fixed six-inch height suitable for every shape and site. The lift must allow observation while preserving a safe landing response. Check that the load is level or in its planned orientation, that all supports have released as expected and that rigging remains seated.

If the load tilts unexpectedly, land rather than compensating by uncontrolled hoist movement. Recheck the estimated CG and leg lengths. An offset CG may require changed lifting-point geometry or separately controlled hoists under an approved plan. Adding a worker or loose counterweight to the suspended load is not an acceptable balancing method.

Do not use indicated crane load alone to excuse an inaccurate weight calculation. Apply the operator's approved weight-verification procedure and chart instructions. Movement effects, radius changes, side loading and structural weakness remain even if the initial static indication appears low.

Travel with predictable motion

Use smooth acceleration and deceleration; shock loading is prohibited by the cited sling regulations. Keep the load clear of obstructions, structures and other cranes. Monitor the complete envelope, including projecting members, rigging and device movement. Verify that the destination remains clear and supports are ready before entering its area.

A tag line may help control orientation where needed, but it does not increase lifting capacity. Select its length, attachment and material for the hazards and plan. Do not wrap it around the body or stand where a moving load can trap the handler. For covered power-line operations, nonconductive tag lines are required when used under the applicable controls; this does not permit closer approach to the line.

Stop on lost communication, unexpected load movement, changed ground conditions, severe weather or a required alarm. Maintain or reach a safe supported state as the approved procedure directs. Continuing for a few seconds on assumed instructions can worsen the problem.

Trial-lift decision

A symmetric two-leg plan predicts equal sharing, but one leg is visibly slack after lift-off and the load rotates toward a nearby wall. The appropriate response is to stop and land in the planned safe area. Review CG, leg length, attachment elevations and seating; revise the plan and recheck demand before trying again. The load's apparent lightness does not resolve the changed force distribution.

Sources: OSHA keeping clear of the load, OSHA electronic signals, OSHA sling operating practices, CCO execution outline.