BRACKET AS 2C9780 - Caterpillar

In selecting a rating for a specific application, the most important consideration is the time that is spent at full throttle. These rating definitions identify the percent of time at full throttle. The definitions also identify the corresponding times below rated rpm. Note: The examples of the applications are only for reference. For an exact determination of the appropriate rating, follow the OEM specifications or consult your Cat dealer.
Table 1
Engine Rating Information
Performance Rating Load Factor Time at Rated Load(1) Examples of Applications
Overall Any One Instance
A 100% 100% n/a Pipe line pumping
Ventilation
B 85% 75% n/a Irrigation pumps
Drilling applications
Plant air compressors
C 70% 50% Less than1 hour Fire pumps
Chippers
Rock crushers
Portable air compressors
D 50% 10% Less than 30 minutes Snowgroomer
Snowblowers
Cranes
Water well drills
E 35% 5% Less than 15 minutes Standby centrifugal pumps
Oil well servicing
(1) Both the overall time at rated load and the time the engine is operated in any one instance must be considered.
Operating engines above the rating definitions can result in shorter service life before overhaul.