Crane Duty Helical Equipment Boxes
SELECTION PROCEDURE
Satisfactory performance of the gearbox is dependent upon correct selection. Selecting a gear unit is definitely influenced by the course of duty of the crane which should be determined and specified. Single, Dual and Triple stage Horizontal equipment units type HA, HB and HC are suggested for Hoist and Long Travel drive. Three stage vertical gear products type VC are recommended for cross travel drives of the EOT crane. Assembly arrangement must be specified while buying the gear units.
1. Compute the required reduction ratio.
2. Determine the horsepower necessary for the prime mover.
3. Make reference to the rating table, see in the ratio column and predicated on input rpm examine the gear box rating horizontally for various course of duty of the crane.
4. The size ought to be selected such that the rated HP is equal or more than the consumed HP.
EXAMPLE
1. Select a unit to transmit 9 HP from 720 rpm electric motor for hoist drive in a course II duty crane, the reduction ratio required is 31.50.
· For hoist drive a two stage horizontal gearbox type HB will become suitable.
· Start to see the ratio column and in the size HB-350, for insight rpm of 720 in course II duty the rated HP is 9.5
· Because the consumed HP is 9, the machine HB-350 will end up being suitable.
2. Decide on a 
unit to transmit 3 HP from 960 rpm electric engine for cross travel drive in a class IV duty crane, the decrease ratio required is 14.26.
· For cross travel drive, a vertical gearbox type VC will end up being suitable.
· Start to see the ratio column and in the size VC – 32Q, for insight rpm of 960 in class IV duty the ranked HP is 3
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