Prowinch Duty Service Classification

What is Duty Cycle?

Knowing and understanding what Duty Cycle means and how it can be used is very important for the use of any of our equipment, not only because you will know how to operate it and under what condition, but also it will increase the lifespan of such unit. Please carefully read and comprehend the following chart in which we compare different duty cycle classifications and also we explain the meaning of each of them.

H1 / M2

Powerhouse and Utilities, infrequent handling, Hoists used primarily to install and service heavy equipment, loads frequently approach capacity and hoist idle for long periods between use.

Max. ON Time Max. No. Starts/Hour Max. ON Time Max. No. Starts
7.5 min or 12.5% 75 15 min 100
H2 / M3

Light machine shop fabrication, service and maintenance; loads and utilization randomly distributed; rated loads infrequently handled. Total running time not over 12.5% of the work period.

Max. ON Time Max. No. Starts/Hour Max. ON Time Max. No. Starts
7.5 min or 12.5% 75 15 min 100
H3 / M4

General machine shop fabrication, assembly, storage and warehousing, loads and utilization randomly distributed Total running time not over 25% of the work period.

Max. ON Time Max. No. Starts/Hour Max. ON Time Max. No. Starts
15 min or 25% 150 30 min 200
H4 / M5

High volume handling of heavy loads, frequently near rated steel loads in steel warehousing, machine and fabrication shops, mills and foundries. Total running time won’t exceed 50% of working period.

Max. ON Time Max. No. Starts/Hour Max. ON Time Max. No. Starts
30 min or 50% 300 30 min 300
H4 / M6

Heavy duty unit, 2 shift operation. Nominal load regularly lifted Traverse or other dead loads below the hook.

Max. ON Time Max. No. Starts/Hour Max. ON Time Max. No. Starts
30 min or 50% 300 30 min 300
H4-H5 / M7

Very heavy duty unit, 2-3 shift operation, grab or magnet below the hook. Regular heavy loads.

Max. ON Time Max. No. Starts/Hour Max. ON Time Max. No. Starts
60 min or 100% 600 NA NA