Crane Duty Helical Equipment Boxes
SELECTION PROCEDURE
Satisfactory performance of the gearbox depends upon correct selection. The selection of a gear unit is usually influenced by the course of duty of the crane which should be determined and specific. Single, Double and Triple stage Horizontal gear units type HA, HB and HC are recommended 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 must be specified while purchasing the gear units.
1. Compute the mandatory reduction ratio.
2. Determine the horsepower necessary for the prime mover.
3. Make reference to the rating table, discover in the ratio column and predicated on input rpm verify the gear box rating horizontally for various course of duty of the crane.
4. The size ought to be selected in a way that the rated HP is equal or even more than the crane duty helical gearbox consumed HP.
EXAMPLE
1. Decide on a unit to transmit 9 HP from 720 rpm electric engine 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.
· Start to see the ratio column and in the size HB-350, for input rpm of 720 in course II duty the ranked HP is 9.5
· As the consumed HP is certainly 9, the machine 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 class IV duty crane, the reduction ratio required is 14.26.
· For cross travel drive, a vertical gearbox type VC will be suitable.
· 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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