8
I
CHAIN BLOCK
SAFETY OPERATIONS & PARTS MANUAL
CH A IN BL O CK
INSPECTION
To maintain continuous and satisfactory operation, a regular inspection
procedure must be initiated so that worn or damaged parts can be
replaced before they become unsafe. The intervals of inspection must be
determined by the individual application and are based upon the type of
service to which the chain block will be subjected. The inspection of chain
blocks is divided into two general classifications designated as frequent
and periodic.
FREQUENT INSPECTIONS
These inspections are usually visual examinations by the operator or other
designated personnel. The frequent inspections are to be performed daily
or monthly and shall include the following items:
A. Braking mechanism for evidence of slippage - Daily.
B. Load chain for lubricant, wear, damaged links or foreign material -
Daily.
C. Hooks for damage, cracks, twists, latch engagement and latch
operation - Monthly. Any deficiencies noted are to be corrected before
the chain block is returned to service.
PERIODIC INSPECTIONS
These are visual inspections by an appointed person who makes records
of apparent external conditions to provide the basis for a continuing
evaluation.
For normal service, the periodic inspections are to be performed yearly
and for heavy service, the periodic inspections are to be performed semi-
annually.
Due to the construction of the chain block, it will be necessary to
particularly disassemble the unit to perform the periodic inspections.
The periodic inspections are to include those items listed under frequent
inspections as well as the following:
A. Chain for excessive wear or stretch.
B. Worn, cracked or distorted parts such as hook blocks, chain guide,
stripper, loose end pin, shafts, gears, hook collar and bearings.
C. Inspect for wear on the tip of the pawl, teeth of the ratchet and pockets
of the liftwheel and hand-wheel.
D. Loose or missing bolts, nuts, pins or rivets.
E. Inspect brake components for worn, glazed or contaminated friction
discs.
F. Corroded, stretched or broken pawl spring.
Free movement of the pawl on the pawl stud. Also, apply a thin coat of
lubricant to the pawl stud before reassembling the unit.
Hooks - dye penetrant, magnetic particle or other suitable crack-
detecting inspections should be performed at least once a year, if external
conditions indicate there has been unusual usage.
Any deficiencies noted are to be corrected before the chain block is
returned to service. Also, the external conditions may show the need for a
detailed inspection which,in turn, may require the use of non destructive-
type testing.
Any parts that are deemed unserviceable are to be replaced with new
parts before the unit is returned to service. It is very important that the
unserviceable parts be destroyed to prevent possible future use as a
repair item and properly disposed of.
MAINTENANCE
NOTE: Only qualified personnel to perform chain
block maintenance.
WARNING
