BOLT 0682121 - Caterpillar

Service Hours and Fuel Consumption
Experience has shown that maintenance intervals are most accurately based on fuel consumption. Fuel consumption corresponds more accurately to the engine load. Table 1 lists average ranges of fuel consumption and service hours for the applicable load factor. Use the range of fuel consumption as a guideline.
Table 1
Maintenance Interval Schedule
Service Hours and Fuel Consumption for C175-16 Engines
Interval 1200RPM(1) 1500RPM(1) 1800RPM(2)
300 Service Hours 74542 L (19694 US gal) 88325 L (23333 US gal) 75375 L (19914 US gal)
600 Service Hours 149088 L (39389 US gal) 176654 L (46667 US gal) 150749 L (39828 US gal)
1200 Service Hours 298177 L (78778 US gal) 353304 L (93333 US gal) 301499 L (79656 US gal)
2400 Service Hours 596349 L (157555 US gal) 706611 L (186667 US gal) 602998 L (159312 US gal)
3000 Service Hours 745438 L (196945 US gal) 883261 L (233333 US gal) 753747 L (199140 US gal)
6000 Service Hours 1490876 L (393889 US gal) 1766526 L (466667 US gal) 1507495 L (398280 US gal)
Top End Overhaul 3522048 L (930525 US gal) 3000000 L (792600 US gal)
18000 Service Hours 12000 Service Hours 12000 Service Hours(2)
Major Overhaul 7066096 L (1866863 US gal) 6000000 L (1585200 US gal)
36000 Service Hours 24000 Service Hours 24000 Service Hours(2)
(1) Fuel consumption is based on a load factor of approximately 60% of the continuous rating.
(2) Fuel consumption is based on a load factor of approximately 30%.Severe Operation
Severe operation is the use of an engine that exceeds current published standards for that engine. Caterpillar maintains standards for the following engine parameters:
Horsepower
Range of rpm
Fuel consumption
Fuel quality
Altitude
Maintenance intervals
Selection of oil
Selection of coolant
Environmental qualities
InstallationRefer to the standards for your engine or consult your Cat dealer to determine if your engine is operating within the defined parameters.Severe operation can accelerate component wear and may reduce the hours to overhaul. Engines that are operating under severe conditions may need more frequent maintenance intervals for the following reasons:
Maximum reliability
Retention of full service lifeBecause of individual applications, identifying all the factors which can contribute to severe operation is difficult. Consult your Cat dealer about the maintenance that is needed for your specific engine.The following factors can contribute to severe operation: environment, improper operating procedures, and improper maintenance practices.Environmental Factors
Extreme Ambient Temperatures
Extended operation in environments that are cold or hot can damage components. Valve components can be damaged by carbon buildup if the engine is frequently started and stopped in cold temperatures. Hot inlet air reduces the performance capabilities of the engine.Note: See this Operation and Maintenance Manual, "Cold-Weather Operation" topic (Operation Section), or see Special Publication, SEBU5898, "Cold-Weather Recommendations".Cleanliness
Unless the equipment is cleaned regularly, extended operation in a dirty environment and in a dusty environment can damage components. Built up mud, dirt, and dust can encase components. This condition can make maintenance difficult. The buildup can contain corrosive chemicals. Corrosive chemicals and salt can damage some components.The high-pressure fuel system is