Caterpillar 3406E , C-15 , and C-16 Truck Engines Maintenance Manual Caterpillar 3406E , C-15 , and C-16 Truck Engines Maintenance Manual. Maintenance Interval Schedule (3406E , C-15 , and C-16 Truck Engines) SMCS Code: 1000; 7500 Ensure that all safety information, warnings, and instructions are read and understood before any operation or any maintenance procedures are performed. The user is responsible for the performance of maintenance, including all adjustments, the use of proper lubricants, fluids, filters, and the replacement of components due to normal wear and aging.
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