Crane Duty Helical Gear Boxes
SELECTION PROCEDURE
Satisfactory performance of the gearbox depends 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 specified. Single, Dual and Triple stage Horizontal gear models type HA, HB and HC are suggested for Hoist and Long Travel drive. Three stage vertical equipment models type VC are suggested for cross travel drives of the EOT crane. Assembly arrangement should be specified while ordering the gear units.

1. Compute the required reduction ratio.
2. Determine the horsepower required for the prime mover.
3. Make reference to the rating table, find in the ratio column and based on input rpm verify the gear box ranking horizontally for various class of duty of the crane.
4. The size should be selected in a way that the rated HP is equal or more compared to 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 become suitable.
· Start to 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
· Since the consumed HP can be 9, the machine HB-350 will become 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 reduction ratio required is 14.26.
· For cross travel drive, a vertical gearbox type VC will be 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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