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 equipment products type HA, HB and HC are suggested for Hoist and Long Travel drive. Three stage vertical equipment units type VC are suggested for cross travel drives of the EOT crane. Assembly arrangement should be specified while purchasing the gear units.
1. Compute the mandatory reduction ratio.
2. Determine the horsepower necessary for the prime mover.
3. Refer to the rating desk, 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 should be selected in a way that the rated 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
· Since the consumed HP is 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 course IV duty crane, the decrease 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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