Crane & Hoist Duty Ratings
Each Crane & Hoist has a specific duty cycle rating. This rating specifies the amount of work a crane or hoist can perform in a given hour. When choosing a crane or hoist you should pick a rating that meets or exceeds your operational needs. If you are not using the right crane or hoist for the given application you run the risk or premature breakdown, wear, or voiding your warranty. All of these possibilities cost you more money in the longrun, not to mention the cost of downtime. Also keep in mind that many of these ratings only specify running at 65% capacity or less. Please contact us if you have any question as to which rating you might possibly need.
| Hoist | Uniformly Distant Work Periods | Infrequent Work Periods | ||
| Duty Rating | Max On Time | Max No. Starts | Max From Cold | Max Starts |
| H1 | 7.5min/hr | 75/hr | 15min | 100 |
| H2 | 7.5min/hr | 75/hr | 15min | 100 |
| H3 | 15min/hr | 150/hr | 30min | 200 |
| H4 | 30min/hr | 300/hr | 30min | 300 |
| H5 | 60min/hr 100% | 600/hr | N/A | N/A |
| CMAA Crane Duty Classifications | ||
| Duty Class | Description | Further Info. |
| Class A | Standby/Infrequent | ex: Maintenance Cranes |
| Class B | Light Service | ex: Light Assembly |
| Class C | Moderate Service | ex: 5-10 loads/hr at 50% Capacity |
| Class D | Heavy Service | ex: Heavy Mahcine Shops |
| Class E | Severe Service | ex: 20 or More Lifts/hr near Capacity |
| Class F | Continuous Severe Service | ex: Continuous Near Capacity, Most Reliable |
