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 TimeMax. No. Starts/HourMax. ON TimeMax. No. Starts
7.5 min or 12.5%7515 min100
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 TimeMax. No. Starts/HourMax. ON TimeMax. No. Starts
7.5 min or 12.5%7515 min100
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 TimeMax. No. Starts/HourMax. ON TimeMax. No. Starts
15 min or 25%15030 min200
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 TimeMax. No. Starts/HourMax. ON TimeMax. No. Starts
30 min or 50%30030 min300
H4 / M6

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

Max. ON TimeMax. No. Starts/HourMax. ON TimeMax. No. Starts
30 min or 50%30030 min300
H4-H5 / M7

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

Max. ON TimeMax. No. Starts/HourMax. ON TimeMax. No. Starts
60 min or 100%600NANA