SWITCH AS-PRESSURE 1737251 - Caterpillar

Severe service is an application of an engine that exceeds current published standards for that engine. Caterpillar maintains standards for the following engine parameters:
Performance (power range, speed range and fuel consumption)
Fuel quality
Altitude range
Maintenance intervals
Oil selection and maintenance
Coolant selection and maintenance
Environmental qualities
InstallationRefer to the standards for the engine or consult with your Cat dealer to determine if the engine is operating within the defined parameters.Severe service operation can accelerate component wear. Engines that operate under severe conditions may need more frequent maintenance intervals in order to ensure maximum reliability and retention of full service life.Due to individual applications, it is not possible to identify all of the factors which can contribute to severe service operation. Consult your Cat dealer for the unique maintenance that is necessary for the engine.The operating environment, improper operating procedures, and improper maintenance procedures can be factors which contribute to severe service conditions.Severe Environmental Factors
Frequent operation in dirty air
Frequent operation at an altitude which is above 1525 m (5000 ft)
Frequent operation in ambient temperatures which are above 32° C (90° F)
Frequent operation in ambient temperatures which are below 0° C (32° F)Severe Operating Conditions
Frequent operation with inlet air which has a corrosive content
Operation with inlet air which has a combustible content
Operation which is outside of the intended application
Operation with a plugged fuel filter
Extended operation at low idle (more than 20% of hours)
Frequent cold starts at temperatures below 0° C (32° F)
Frequent dry starts (starting after more than 72 hours of shutdown)
Frequent hot shutdowns (shutting down the engine without the minimum of 2 minutes to 5 minutes of cool down time)
Operation above the engine rated speed
Operation below the peak torque speed
Operating with fuel which does not meet the standards for distillate diesel fuel as stated in Special Publication, SEBU6385, "Caterpillar On-highway Diesel Engine Fluids Recommendations", "Distillate Diesel Fuel"
Operating with fuel which contains greater than 1000 ppm (0.1%) sulfur
Operating with a blend of distillate fuel which contains more than 5 percent biodieselImproper Maintenance Procedures (Maintenance Procedures Which May Contribute to a Severe Service Application)
Inadequate maintenance of fuel storage tanks from causes such as excessive water, sediment, and microorganism growth.
Extending maintenance intervals beyond the recommended intervals
Using fluids which are not recommended in Special Publication, SEBU6385, "Caterpillar On-highway Diesel Engine Fluids Recommendations"
Extending maintenance intervals for changing the engine oil and engine coolant without S O S validation
Extending maintenance intervals for changing air filters, oil filters, and fuel filters
Failure to use a water separator
Using filters which are not recommended by Special Publication, PEWJ0074, "2008 Cat Filter and Fluid Application Guide"
Storing the engine for more than 3 months but less than 1 yr (For information about engine storage, refer to Special Publication, SEHS9031, "Storage Procedure for Cat Products")
Storing the engine for 1 yr to 2 years (For information about engine storage, refer to Special Instruction, SEHS5001, "The Long Term Storage and Recovery of Certain Commercial Engines")