• Store and handle power operated blocks correctly.
• Inspect the block and accessories before use and before
placing into storage.
• For top hook suspension, use hooks that are fitted with safety
catches or mouse the hook and ensure the support fits freely
into the seat of the hook.
• For trolley suspension, ensure the trolley is correctly set
for the beam width.
• Check that the bottom hook will reach its lowest point without
running the chain or rope fully out.
• Raise the load just clear then halt the lift to ensure the
integrity of the block before continuing with the lift. If the
block has more than one speed, start in the slow speed.
• Expose power operated blocks to chemicals, particularly acids,
without consulting the supplier.
• Expose power operated blocks directly to the elements, water
spray, steam etc without consulting the supplier.
• Replace the load chain or rope with a longer one without
consulting the supplier.
• Use the load chain or rope to form a sling.
• Change motions without first allowing the motor to stop.
• Allow persons to ride on power operated blocks.
Selecting the Correct Block
Power operated blocks are available in a range of capacities,
designs and suspensions with electric or pneumatic power
options. Select the block to be used and plan the lift taking
following into account:
Type of block - chain, wire rope - electric, pneumatic - class
of use - capacity and range of lift etc.
Type of suspension - hook, trolley, fixed.
Speeds and control - single speed, dual speed - pendant push
button, pull cord, remote etc.
Power operated blocks are designed for vertical lifting only.
Consult the supplier if the block is to be used in areas of high
risk, exposed to the elements, water, steam etc, with hazardous
substances, eg acids or chemicals, or subjected to extremes of
Storing and Handling Power Operated Blocks
Never return damaged blocks to storage. They should be dry,
clean and protected from corrosion.
In the case of blocks used for temporary applications, store
them on a purpose made rack or suspended from their top
suspension fitting. Trailing cables, pendants etc may be
removed, identified and stored separately to prevent loss or
damage whilst in store. In the case of blocks left in situ, park
the block in a suitable
position so that it is protected from damage and does not
present a danger. Raise the bottom hook so that it is not a
danger to persons or liable to become accidentally engaged.
Isolate the power supply.
Installing and Commissioning
Follow the specific instructions for installation and
commissioning issued by the supplier and the general
requirements given overleaf. Ensure the controls work in the
correct direction and that motion limits are set and operate
correctly. If the block fails to operate correctly contact the
Using Power Operated Blocks Safely
Do not use defective blocks, slings or accessories.Check the
slinging arrangement, that the block is safely rigged, that the
chain or rope is not twisted and that the load is free to move.
Raise the load just clear, halt the lift to ensure the integrity
of the block, slinging arrangement etc. Always commence lifting
in the slow speed. Avoid unnecessary inching of the load.Check
the travel path is clear and that you have a clear view so
as to avoid accidental hook engagement or collision. Follow
anyparticular site safety rules applicable to the movement of
suspended loads. Keep fingers, toes etc clear when lowering
In-service Inspection and Maintenance
Follow the specific instructions for maintenance issued by the
supplier. These should be incorporated into the site maintenance
programme observing any particular needs due to the site or
Regularly inspect the block and, in the event of the following
defects, refer the block to a Competent Person for thorough
examination: operational faults; block will not lift; slips
back; motion commands reversed; over-runs when command released;
wear; damage to trolley, hooks and fittings; damaged,worn or
corroded chain or rope; other visible defects.