NM Crane Operator cheat sheet

Boom length is measured pin-to-pin along the boom centerline; jib length is measured separately and adds to tip radius, not to boom length.

Boom angle is measured from horizontal; load radius increases as boom angle decreases, so a lower angle means less capacity at the same boom length.

Counterweight reduces forward tipping moment but adds to ground bearing pressure and to the crane's overall tail swing envelope.

Outrigger spread (fully extended vs. mid-extend) changes the load chart; operating with outriggers partially extended requires the manufacturer's intermediate chart.

Boom deflection under load increases actual radius beyond the geometric radius; charts already account for rated deflection, so never add extra allowance.

Rough-terrain cranes travel with a load only per the manufacturer's travel chart, which is separate from the lifting chart.

Lattice boom capacity is generally limited by strength; hydraulic boom capacity is often limited by stability (tipping) at long radius.

Auxiliary (aux) head and jib configurations each have their own capacity deductions that must be subtracted from gross capacity.

Anti-two-block device, boom angle indicator, and load moment indicator are safety devices; bypassing any of them voids the lift's legitimacy.

Ground bearing pressure = total weight (crane + counterweight + load + rigging) divided by the effective bearing area under the outrigger floats or mats.

Outrigger float pressure can exceed several hundred psi on a small float; a mat increases area and reduces pressure in inverse proportion to area.

Check for underground voids, utilities, vaults, and buried tanks under outrigger positions; a float over a void is a tip-over hazard regardless of surface appearance.

Setup within 10 ft of an excavation requires the excavation's competent-person determination of slope stability and setback.

Crane must be level per manufacturer tolerance (commonly within 1% of level); out-of-level condition swings the load and reduces capacity.

Fully deploy outriggers on both sides, use pads under floats, and verify no float is suspended or bridging a soft spot.

Barricade the swing radius and the counterweight tail swing area before lifting begins.

Firm, drained, uniformly graded soil is preferable; fill or recently disturbed soil must be evaluated, not assumed adequate.

Net capacity = gross capacity from the chart minus the weight of all lifting attachments (jib, hook block, slings, spreader) below the boom tip.

Radius is measured from the center of rotation to the center of gravity of the load, not to the boom tip.

Gross load includes the load, rigging, hook block, and any attached below-the-tip devices; the chart capacity must be reduced accordingly.

For multi-part lines: line pull = load / number of parts, ignoring friction; add friction losses for reeving efficiency.

Sling tension for a two-leg bridle: tension = (load / 2) / sin(angle from horizontal); flatter angles increase tension sharply.

Sling tension for a four-leg bridle is generally taken as the load carried by two legs, since load sharing among four legs is not equal.

Load moment = load weight × radius; the load moment indicator trips when the moment approaches the chart limit.

When boom length, radius, and configuration are between chart values, use the next lower capacity (never interpolate upward).

Sling angle factor (load angle multiplier) = 1 / sin(angle from horizontal); at 30° the multiplier is 2.0, at 60° it is about 1.155.

Sling angle is measured from horizontal; a 30° angle doubles the tension compared with a vertical lift of the same load.

Never exceed the sling's rated capacity; rated capacity assumes vertical loading unless a specific angle rating is given.

Wire rope slings: inspect for broken wires, kinking, bird-caging, crushed or heat-damaged sections; remove from service.

Synthetic web slings: reject for cuts, snags, burns, UV degradation, or missing/damaged tags; never use for temp above the manufacturer's limit.

Shackles and hooks: use only with the pin/bolt fully seated; hooks need a functioning latch and should not be side-loaded.

Center the load's center of gravity under the hook; an off-center lift causes load swing and unequal leg loading.

Tag lines control rotation and swing; do not use them to pull a load outside the crane's rated radius.

Never ride the load or the hook; personnel must not be under a suspended load.

Shock loading (sudden starts/stops, snatching a load) can exceed static tension and overload the rigging.

Pre-shift inspection covers: fluid levels, tires, outrigger pads and beams, boom sections, wire rope, hook block and latch, and safety devices.

Wire rope removal criteria: broken wires in a running rope, reduction in diameter, corrosion, kinking, or core protrusion per manufacturer/OSHA limits.

Check the anti-two-block device and load moment indicator function before each shift; a failed device takes the crane out of service.

Inspect slings and rigging before each use; a damaged sling is tagged out and removed, not returned to the rack.

Record inspections and maintenance; periodic (annual/comprehensive) inspections are separate from daily pre-shift checks.

Hydraulic leaks, cracked welds, and outrigger beam wear are grounds for removal from service until repaired.

Do not operate a crane with an expired or failed inspection; the operator has authority to refuse the lift.

Verify fire extinguisher, access ladder/handrails, and emergency controls are present and functional.

Only one designated signal person directs the lift; the operator obeys that person and stops for a stop signal from anyone.

Hand signals: raise/lower, boom up/down, swing left/right, stop, emergency stop - all must be understood by operator and signal person before the lift.

If the signal person is out of view or the signal is unclear, stop the lift until communication is restored.

Radio communication must be clear and dedicated to the lift; a lost radio signal is a stop condition.

Keep personnel out of the swing radius and never allow anyone under a suspended load.

Do not lift loads over people, occupied structures, or power lines; plan the travel path before hoisting.

Use tag lines for control; do not use them to overcome load swing or to extend radius.

Stop operations in high wind, lightning, or poor visibility when conditions exceed the manufacturer's limits or the operator's judgment.

Assume all overhead lines are energized; treat them as live until the utility confirms de-energization in writing.

Maintain the required minimum clearance from lines; when the voltage is unknown, treat it as the highest voltage category.

For lines under 50 kV, minimum clearance is typically 10 ft; higher voltages require greater distances per OSHA Table T.

Use a spotter when operating near lines; the spotter must have a clear view and authority to stop the lift.

If the crane contacts a line: keep the operator in the cab, warn others away, and call the utility; do not touch the crane or load.

If the operator must leave the cab, jump clear and shuffle away without touching the crane and ground simultaneously.

Do not store or park equipment under overhead lines; maintain clearance during travel and boom stowing.

Grounding and insulating the crane does not substitute for maintaining clearance.

OSHA 29 CFR 1926 Subpart CC governs cranes and derricks in construction; 1910.180 covers general-industry cranes.

Operator qualification: crane operators on construction sites must be certified by an accredited certifying body or qualified per the applicable standard.

A signal person, rigger, and crane operator each have defined qualification/training requirements under Subpart CC.

The employer must ensure a competent person inspects equipment and that the operator performs pre-shift inspections.

Power line clearance distances come from OSHA Table T in 1926.1408; the table sets minimum approach distances by voltage.

New Mexico adopts OSHA standards through the state's occupational safety framework; the federal 1926 Subpart CC minimums apply on construction sites.

Lift planning and a critical lift plan are required for complex lifts, multiple cranes, or lifts near power lines or personnel.

Recordkeeping: keep certification, inspection, and maintenance records available for review.

Boom length is measured pin-to-pin along the boom centerline; jib length is measured separately and adds to tip radius, not to boom length.

Boom angle is measured from horizontal; load radius increases as boom angle decreases, so a lower angle means less capacity at the same boom length.

Counterweight reduces forward tipping moment but adds to ground bearing pressure and to the crane's overall tail swing envelope.

Outrigger spread (fully extended vs. mid-extend) changes the load chart; operating with outriggers partially extended requires the manufacturer's intermediate chart.

Boom deflection under load increases actual radius beyond the geometric radius; charts already account for rated deflection, so never add extra allowance.

Rough-terrain cranes travel with a load only per the manufacturer's travel chart, which is separate from the lifting chart.

Lattice boom capacity is generally limited by strength; hydraulic boom capacity is often limited by stability (tipping) at long radius.

Auxiliary (aux) head and jib configurations each have their own capacity deductions that must be subtracted from gross capacity.

Anti-two-block device, boom angle indicator, and load moment indicator are safety devices; bypassing any of them voids the lift's legitimacy.

Ground bearing pressure = total weight (crane + counterweight + load + rigging) divided by the effective bearing area under the outrigger floats or mats.

Outrigger float pressure can exceed several hundred psi on a small float; a mat increases area and reduces pressure in inverse proportion to area.

Check for underground voids, utilities, vaults, and buried tanks under outrigger positions; a float over a void is a tip-over hazard regardless of surface appearance.

Setup within 10 ft of an excavation requires the excavation's competent-person determination of slope stability and setback.

Crane must be level per manufacturer tolerance (commonly within 1% of level); out-of-level condition swings the load and reduces capacity.

Fully deploy outriggers on both sides, use pads under floats, and verify no float is suspended or bridging a soft spot.

Barricade the swing radius and the counterweight tail swing area before lifting begins.

Firm, drained, uniformly graded soil is preferable; fill or recently disturbed soil must be evaluated, not assumed adequate.

Net capacity = gross capacity from the chart minus the weight of all lifting attachments (jib, hook block, slings, spreader) below the boom tip.

Radius is measured from the center of rotation to the center of gravity of the load, not to the boom tip.

Gross load includes the load, rigging, hook block, and any attached below-the-tip devices; the chart capacity must be reduced accordingly.

For multi-part lines: line pull = load / number of parts, ignoring friction; add friction losses for reeving efficiency.

Sling tension for a two-leg bridle: tension = (load / 2) / sin(angle from horizontal); flatter angles increase tension sharply.

Sling tension for a four-leg bridle is generally taken as the load carried by two legs, since load sharing among four legs is not equal.

Load moment = load weight × radius; the load moment indicator trips when the moment approaches the chart limit.

When boom length, radius, and configuration are between chart values, use the next lower capacity (never interpolate upward).

Sling angle factor (load angle multiplier) = 1 / sin(angle from horizontal); at 30° the multiplier is 2.0, at 60° it is about 1.155.

Sling angle is measured from horizontal; a 30° angle doubles the tension compared with a vertical lift of the same load.

Never exceed the sling's rated capacity; rated capacity assumes vertical loading unless a specific angle rating is given.

Wire rope slings: inspect for broken wires, kinking, bird-caging, crushed or heat-damaged sections; remove from service.

Synthetic web slings: reject for cuts, snags, burns, UV degradation, or missing/damaged tags; never use for temp above the manufacturer's limit.

Shackles and hooks: use only with the pin/bolt fully seated; hooks need a functioning latch and should not be side-loaded.

Center the load's center of gravity under the hook; an off-center lift causes load swing and unequal leg loading.

Tag lines control rotation and swing; do not use them to pull a load outside the crane's rated radius.

Never ride the load or the hook; personnel must not be under a suspended load.

Shock loading (sudden starts/stops, snatching a load) can exceed static tension and overload the rigging.

Pre-shift inspection covers: fluid levels, tires, outrigger pads and beams, boom sections, wire rope, hook block and latch, and safety devices.

Wire rope removal criteria: broken wires in a running rope, reduction in diameter, corrosion, kinking, or core protrusion per manufacturer/OSHA limits.

Check the anti-two-block device and load moment indicator function before each shift; a failed device takes the crane out of service.

Inspect slings and rigging before each use; a damaged sling is tagged out and removed, not returned to the rack.

Record inspections and maintenance; periodic (annual/comprehensive) inspections are separate from daily pre-shift checks.

Hydraulic leaks, cracked welds, and outrigger beam wear are grounds for removal from service until repaired.

Do not operate a crane with an expired or failed inspection; the operator has authority to refuse the lift.

Verify fire extinguisher, access ladder/handrails, and emergency controls are present and functional.

Only one designated signal person directs the lift; the operator obeys that person and stops for a stop signal from anyone.

Hand signals: raise/lower, boom up/down, swing left/right, stop, emergency stop - all must be understood by operator and signal person before the lift.

If the signal person is out of view or the signal is unclear, stop the lift until communication is restored.

Radio communication must be clear and dedicated to the lift; a lost radio signal is a stop condition.

Keep personnel out of the swing radius and never allow anyone under a suspended load.

Do not lift loads over people, occupied structures, or power lines; plan the travel path before hoisting.

Use tag lines for control; do not use them to overcome load swing or to extend radius.

Stop operations in high wind, lightning, or poor visibility when conditions exceed the manufacturer's limits or the operator's judgment.

Assume all overhead lines are energized; treat them as live until the utility confirms de-energization in writing.

Maintain the required minimum clearance from lines; when the voltage is unknown, treat it as the highest voltage category.

For lines under 50 kV, minimum clearance is typically 10 ft; higher voltages require greater distances per OSHA Table T.

Use a spotter when operating near lines; the spotter must have a clear view and authority to stop the lift.

If the crane contacts a line: keep the operator in the cab, warn others away, and call the utility; do not touch the crane or load.

If the operator must leave the cab, jump clear and shuffle away without touching the crane and ground simultaneously.

Do not store or park equipment under overhead lines; maintain clearance during travel and boom stowing.

Grounding and insulating the crane does not substitute for maintaining clearance.

OSHA 29 CFR 1926 Subpart CC governs cranes and derricks in construction; 1910.180 covers general-industry cranes.

Operator qualification: crane operators on construction sites must be certified by an accredited certifying body or qualified per the applicable standard.

A signal person, rigger, and crane operator each have defined qualification/training requirements under Subpart CC.

The employer must ensure a competent person inspects equipment and that the operator performs pre-shift inspections.

Power line clearance distances come from OSHA Table T in 1926.1408; the table sets minimum approach distances by voltage.

New Mexico adopts OSHA standards through the state's occupational safety framework; the federal 1926 Subpart CC minimums apply on construction sites.

Lift planning and a critical lift plan are required for complex lifts, multiple cranes, or lifts near power lines or personnel.

Recordkeeping: keep certification, inspection, and maintenance records available for review.