Crane Duty Helical Equipment Boxes
SELECTION PROCEDURE
Satisfactory performance of the gearbox is dependent upon correct selection. The selection of a gear unit is usually influenced by the class of duty of the crane which should be determined and specified. Single, Double and Triple stage Horizontal equipment models type 
HA, HB and HC are suggested for Hoist and Long Travel drive. Three stage vertical equipment products type VC are suggested for cross travel drives of the EOT crane. Assembly arrangement must be specified while ordering the gear units.
1. Compute the required reduction ratio.
2. Determine the horsepower necessary for the prime mover.
3. Make reference to the rating desk, observe in the ratio column and based on input rpm examine the gear box rating horizontally for various class of duty of the crane.
4. The size ought to be selected such 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 motor for hoist drive in a course II duty crane, the decrease ratio required is 31.50.
· For hoist drive a two stage horizontal gearbox type HB will end up being 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
· As the consumed HP is certainly 9, the unit HB-350 will be suitable.
2. Decide on a unit to transmit 3 HP from 960 rpm electric motor for cross travel drive in a course IV duty crane, the decrease ratio required is 14.26.
· For cross travel drive, a vertical gearbox type VC will end up being suitable.
· See the ratio column and in the size VC – 32Q, for insight rpm of 960 in class IV duty the rated HP is 3
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