Crane Duty Helical Equipment Boxes
SELECTION PROCEDURE
Satisfactory performance of the gearbox is dependent upon correct selection. The selection of a gear unit is definitely influenced by the class of duty of the crane which should be determined and specific. Single, Dual and Triple stage Horizontal gear products type HA, HB and HC are suggested for Hoist and Long Travel drive. Three stage vertical gear models type VC are suggested for cross travel drives of the EOT crane. Assembly arrangement should be specified while buying the gear units.

1. Compute the mandatory reduction ratio.
2. Determine the horsepower required for the prime mover.
3. Make reference to the rating desk, find in the ratio column and based on input rpm check the gear box rating horizontally for various class of duty of the crane.
4. The size ought to be selected in a way that the ranked HP is equal or more than the consumed HP.

EXAMPLE
1. Decide on a unit to transmit 9 HP from 720 rpm electric 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 be suitable.
· See the ratio column and in the size HB-350, for input rpm of 720 in class II duty the rated HP is 9.5
· As the consumed HP is usually 9, the machine HB-350 will be suitable.

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

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