Crane inspection, maintenance, and setup
Crane inspection, maintenance, and setup tests the conditions that must exist before a lift: a mechanically sound crane, a complete inspection record, and a stable, level setup with controlled clearances.
Inspection tiers
The operator performs a pre-shift inspection of controls, brakes, wire rope, hooks, latches, limit switches, alarms, and safety devices. Periodic inspections follow the manufacturer and code intervals; annual inspections are required and documented. Defective safety devices - anti-two-block, load moment indicator, boom angle indicator - take the crane out of service until repaired.
Setup
Set on firm, drained, level ground. Fully extend outriggers, use manufacturer-approved mats or cribbing, and verify level in both directions. Check for underground voids, vaults, and utilities. Maintain OSHA power-line minimum approach distances unless the line is de-energized and grounded, or the utility controls the zone. Assemble and disassemble per the manufacturer's procedures.
Worked example
A crane's outrigger float carries 60,000 lb. A 4 ft × 4 ft mat gives 16 ft² = 2,304 in², so bearing pressure is 60,000 / 2,304 = 26 psi. A 2 ft × 2 ft mat gives 576 in², or 104 psi - likely beyond the soil's capacity. The mat size, not the crane's total weight alone, controls whether the outrigger punches into the ground. Add dynamic load and off-level factors before accepting the setup.
Traps
Skipping the pre-shift because the crane ran yesterday; using cribbing smaller than the float; checking level only front-to-back; ignoring underground voids; treating the LMI as a substitute for reading the chart; returning a crane to service with a bypassed limit switch.