Power your equipment with Caterpillar and you give your customers a competitive edge. Cat® engines deliver all the name has come to signify: Durability. Reliability. Efficiency. Performance.

Ratings are the total output capability of the engine equipped with standard accessories: lube oil, fuel oil and jacket water pumps.

C9 ELECTRONIC ENGINE
C13 ELECTRONIC ENGINE

A Rating (Continuous):
• For heavy-duty services when engine is operated at rated load and speed up to100% of the time without interruption or load cycling.
• Time at full load up to 100% of the duty cycle.
• Typical application examples include pipeline pumping.

B Rating:
• For service where power and/or speed are cyclic.
• Time at full load not to exceed 80% of the duty cycle.
• Typical application examples include irrigation where normal pump demand   is 85% of engine rating, oil field mechanical pumping/drilling, stationary /plant air compressors.

C Rating (Intermittent):
• For service where power and/or speed are cyclic. Horsepower and speed  capability of the engine can be utilized for one uninterrupted hour followed by one hour of operation at or below the A rating.
• Time at full load not to exceed 50% of the duty cycle.
• Typical application examples include agriculture tractors, off-highway truck, fire pumps, blast hole drills, rock crushers, kill pumps, oil field hoisting, and work over rigs.

D Rating:
• For service where rated power is required for periodic overloads. The maximum horsepower and speed capability of the engine can be utilized for a  maximum of 30 uninterrupted minutes followed by one hour at the C rating.
• Time at full load not to exceed 10% of the duty cycle.
• Typical application examples include offshore cranes, runway snow blowers,
   water well drills, portable air compressors, cementers and fire pump certification power.

E Rating:
• For service where rated power is required for a short time for initial starting or sudden overload. For emergency service where standard power is unavailable. Horsepower and speed capability of the engine can be utilized for a maximum of 15 uninterrupted minutes followed by one hour at the C rating or duration of emergency.
• Time at full load not to exceed 5% of the duty cycle.
• Typical application examples include standby centrifugal water pumps, oil   field well servicing crash trucks and gas turbine starters.

NA — Naturally Aspirated
T — Turbocharged
TA — Turbocharged-Aftercooled
ATAAC — Air-to-Air Aftercooled
DI — Direct Injection
PC — Precombustion Chamber
(Indirect Injection)
hp — Horsepower
kW — Metric equivalent of horsepower