Structural Technology, Inc. will conduct an annual inspection with the
hoist in its normal location and usually it does not require the hoist to be
dismantled. Covers and other items normally supplied to allow inspection of
components will be opened or removed during our inspections. Our technicians are
trained to recognize safety discrepancies that can be present in your hoist.
All safety discrepancies will be noted in a written report that is issued
STI examines the following items during the course
of an annual inspection.
Operating mechanisms checked for maladjustment and
listened to for unusual sounds that may indicate problems.
Tightness of bolts, nuts, and rivets.
Excessive wear, corrosion, cracks, or distorted
parts in the following:
hand chain wheels
locking and clamping devices
Damage or excessive wear on hook-retaining nuts or
collars and pins and welds or rivets used to secure the retaining members.
Excessive wear or damage on load sprockets, idler
sprockets, hand chain wheel, and drums or sheaves shall be checked for
damage or excessive wear.
Hand chain-operated hoists checked for evidence of
worn, glazed, or oil-contaminated friction disks; worn pawls, cams, or
ratchets; and corroded, stretched, or broken pawl springs in braking
Evidence of damage to supporting structure or
Presence of legible warning labels .
End connections load chains shall be checked for
evidence of wear, corrosion, cracks, damage, or distortion.
Welded link hoist chain
Welded Chain Inspection
The hoist shall be tested under load in
lifting and lowering directions and the operation of the chain and sprockets
shall be observed. The chain should feed smoothly into and away from the
If the chain binds, jumps, or is noisy,
it shall first be checked to ensure that it is clean and properly
lubricated. If the trouble persists, the chain and mating parts shall be
inspected for wear, distortion, or other damage.
The chain shall be examined visually
for gouges, nicks, weld spatter, corrosion, and distorted links.
The chain shall then be slackened and
the adjacent links moved to one side to inspect for wear at the contact
The chain should be measured according
to the hoist manufacturer's instructions. If instructions are not available,
the process shall continue as follows.
An unworn, un-stretched length of the chain shall be
selected (e.g., at the slack end).
The chain shall be suspended vertically under tension
and, using a caliper-type gage, the outside length of any convenient
number of links shall be measured (approximately 12 to 24 inches overall).
The same number of links in the used sections shall
be measured and the percentage increase in length shall be calculated.
Cracks, nicks, or gouges.
Latch engagement, damaged or
malfunctioning latch (if provided) .
Hook attachment and securing means.
Deformation. Any bending or twisting
exceeding 10 degrees from the plane of the unbent hook.
Throat Opening. Any distortion causing
an increase in throat opening exceeding 15 percent.
Wear. Any wear exceeding 10 percent of
the original section dimension of the hook or its load pin.
Non-Destructive Testing for surface or