HUB-GEAR 0R1642 - Caterpillar

knowing the use of the engine is important in order to match the rating to the operating profile. The proper rating selection is also important so that the customers perception of price and value is realized.In selecting a rating for a specific application, the most important consideration is the time that is spent at full throttle. The rating definitions identify the percent of time at full throttle. The definitions also identify the corresponding times below rated rpm.Note: For an exact determination of the appropriate rating, follow the OEM specifications or consult your Cat dealer.There are five ratings from A to E. The rating for the C3.4B industrial engine is C for up to and including 75 kW (100.57hp) and D for above 75 kW (100.57hp).C - Ratings are for service where power and/or speed are cyclic. The horsepower and speed of the engine which can be utilized for one uninterrupted hour. Followed by 1 hour of operation at or below the continuous rating.Operating limits are:
Time at full load not to exceed 50% of the duty cycle or one-hour max. Load factor limited to 70%.
Full load operation limited to one uninterrupted hour. Followed by 1 hour of operation at or below 75% of the full load power curve condition.
Typical operating hours per year are 3000 hours.D - Ratings are for service where rated power is required by period overloads. The maximum horsepower and speed capability of the engine can be utilized for a maximum of 30 uninterrupted minutes followed by 1 hour at intermittent.Other operating limits are:
Time at full load not to exceed 10% of the duty cycle or 30 min max
Load factor limited to 50%.
Typical operating hours per year is 1500.
Operating engines above the rating definitions can result in shorter service life before overhaul.