27
Harrington complete cranes
Crane Service Classifications:

Crane Service Class:

•The CraneManufacturersAssociationofAmerica(CMAA)has establishedsixserviceclasses
forcranes.TheseclassesareClassAthroughClassF,andarebasedonl oadcyclesand
loadmagnitude.ClassAcranesaresuitedfortheleastsevereservice,and ClassFcranesare
suitedforthemostsevereservice.

Class C Service Class:

TheloadcycleandmagnitudecombinationsthatdefinetheClassC ServiceClassare:
•Loadisusuallybetween1/3and2/3ofratedcapacity andisfrequentlyequaltorated
capacity,anddesignservicelifeis20,000to10 0,000cycles.
•Loadisusually1/3ofratedcapacityandisrarelyequaltoratedcapacity,anddesignser vice
lifeis100,000to500,00 0cycles.
•Loadisusuallyverylightandrarelyisequaltoratedcapacity,anddesignservice lifeis
500,000to2,000,0 00cycles.

Class B Service Class:

TheloadcycleandmagnitudecombinationsthatdefinetheClassB ServiceClassare:
•Loadisusually1/3ofratedcapacityandisrarelyequaltoratedcapacity,anddesignser vice
lifeis20,000to100,000 cycles.
•Loadisusuallyverylightandrarelyisequaltoratedcapacity,anddesignservice lifeis
200,000to500,0 00cycles.