(daily to monthly intervals) – Frequent inspections are usually performed
at the start of each shift by the operator who walks around the crane looking
for defects or problem areas. Components that have a direct bearing on the safety
of the crane and whose status can change from day to day with use must be inspected
daily, and when possible, observed during operation for any defects that could
affect safe operation. To help determine when the crane is safe to operate, daily
inspections should be made at the start of each shift. Frequent inspections should
include, but are not limited to the following:
Check that all exposed moving parts are guarded. A removed guard may indicate
that a mechanic is still working on part of the crane.
Visually inspect each component of the crane used in lifting, swinging, or lowering
the load or boom for any defects that might result in unsafe operation.
Inspect all wire rope (including standing ropes), sheaves, drums rigging, hardware,
and attachments. Remember, any hook that is deformed or cracked must be removed
from service. Hooks with cracks, excessive throat openings of 15%, or hook twists
of 10 degrees or more, must be removed from service.
Check for freedom of rotation of all swivels.
Visually inspect the boom and jib for straightness and any evidence of physical
damage, such as cracking, bending, or any other deformation of the welds. Look
for corrosion under any attachments that are connected to the chords and lacing.
Watch carefully for cracking or flaking of paint. This may indicate fatigue of
the metal which often precedes a failure. On lattice booms, look for bent lacing.
If they are kinked or bent, the main chord can lose substantial support in that
area. When lacing is bent, the ends also tend to draw together which pulls the
main chords out of shape. This precaution is especially important on tubular booms
where every component must be straight and free from any dents. Do not attempt
to straighten these members by hammering or heating them and drawing them out.
They must be cut out and replaced with lacing to the manufacturer's specifications,
procedures, and approval.
Inspect tires for cuts, tears, breaks, and proper inflation.
Visually inspect the crane for fluid leaks, both air and hydraulic.
Visually check that the crane is properly lubricated. The fuel, lubricating oil,
coolant and hydraulic oil reservoirs should be filled to proper levels.
Check that the crane is equipped with a fully charged fire extinguisher and that
the operator knows how to use it.
Check all functional operating mechanisms such as: sheaves, drums, brakes, locking
mechanisms, hooks, the boom, jib, hook rollers brackets, outrigger components,
limit switches, safety devices, hydraulic cylinders, instruments, and lights.
Check the turntable connections for weld cracks and loose or missing bolts. If
they are loose, there is a good chance that they have been stretched.
When checking the outriggers be sure that neither the beams nor the cylinders
are distorted. Check that the welds are not cracked and that both the beams and
cylinders extend and retract smoothly and hold the load. Check the condition of
the floats, and check that they are securely attached.
Inspect and test all brakes and clutches for proper adjustment and operation.
Always inspect boom hoist lockout and other operator aids, such as anti-two-block
devices (ATB) and load moment indicators (LMI), for proper operation and calibration.
While the engine is running, check all gauges and warning lights for proper readings
and operate all controls to see that they are functioning properly.
Check for any broken or cracked glass that may affect the view of the operator.