Crane Duty Helical Gear Boxes
SELECTION PROCEDURE
Satisfactory performance of the gearbox depends upon correct selection. Selecting a gear unit is influenced by the class of duty of the crane which should be determined and specified. Single, Double and Triple stage Horizontal gear products type HA, HB and HC are recommended for Hoist and Long Travel drive. Three stage vertical equipment 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 mandatory reduction ratio.
2. Determine the horsepower necessary for the prime mover.
3. Refer to the rating table, observe in the ratio column and predicated on input rpm check 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 even more than the consumed HP.

EXAMPLE
1. Select a unit to transmit 9 HP from 720 rpm electric electric motor for hoist drive in a class II duty crane, the decrease ratio required is 31.50.
· For hoist drive a two stage horizontal gearbox type HB will be suitable.
· Start to see the ratio column and in the size HB-350, for insight rpm of 720 in class II duty the rated HP is 9.5
· As the consumed HP is certainly 9, the machine HB-350 will end up being suitable.

2. Select a unit to transmit 3 HP from 960 rpm electric electric motor for cross travel drive in a class IV duty crane, the reduction ratio required is 14.26.
· For cross travel drive, a vertical gearbox type VC will become suitable.
· Start to see the ratio column and in the size VC – 32Q, for insight rpm of 960 in course IV duty the rated HP is 3

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