CHAIN HOIST INSPECTION & MANUALS
Before lifting inspect carefully the hooks,
the load chain, the brake device and lubrication of the block. For safe
operation you must keep six rules as following.
1. Don't lift
load exceeding the rated capacity of the chain block.
2. Don't use the block chain as a sling.
3. Don't use when the chain is kinking.
4. To avoid accidents working or passing under a lifting load is strictly
5. In case of the hand chain fails to move. Don't use undue force.
Stop operation and proceed inspection of the chain block.
6. Only use to lift vertically, do not use to drag loads.
1. After operation,
clean the chain block from dirt and keep it in a dry place from rust
2. Clean the chain block annually by purging the parts in kerosene
and apply grease to them. It is advisable that the cleaning work should
be done by skilled hands.
3. "O" marks on the two disk gears should be aligned.
4. Stick the rollers of both left and right bearings to the inner
race of the bearings on the chain sprocket shaft journal, and then
put then into the outer race of the bearings on the side plates.
5. After cleaning and repair the chain block should be subjected to
non-load and heavy load tests. If it works normally put it into operation.
6. For convenience of maintenance and dismantling. One of the links
of the hand chain is open.
Lifting Load: Ensure area is clear of
people and obstruction, and begin lifting by slowly pulling hand chain
in "U" direction.
Lowering Load: Ensure area is clear of people and obstructions, and
reverse lifting procedure. It may be necessary to apply extra initial
effort to release
friction between brake components.
The operator shall perform a pre-use inspection, if
any deficiencies are found the equipment will be taken out of service
and the supervisor notified.
1.Visually inspect all load
chains for gross damage that may be a hazard.
2.Hoist is properly secured.
3.The load does not exceed the load limit on the warning label.
4. Check that motions are smooth and regular with no hesitations,
vibration, binding, unusual noise, or other irregularity.
5.Chain is not kinked or damaged.
The Annual inspection may be performed with the hoist
in its normal location and do not require the hoist to be dismantled.
Covers and other items normally supplied to allow inspection of components
should be opened or removed for these inspections.
||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:
||Damage or excessive wear on hook-retaining
nuts or collars and pins and welds or rivets used to secure the
||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 mechanism.
||Evidence of damage to supporting structure
||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 sprockets.
||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, unstretched length of the
chain shall be selected (e.g., at the slack end).
The chain shall be suspended vertically
under tension and, using a calliper-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.