FOAM 3777940 - Caterpillar

Install the filters by hand. Tighten each filter until the sealing surface contacts the base. Note the position of the index marks on each filter in relation to a fixed point on the filter base. Note: Caterpillar filters have rotation index marks that are spaced 90° or 1/4 of a turn away from each other. When you tighten the filters, use the rotation index marks as a guide.
Tighten each filter according to the instructions that are printed on the filter. Note: You may need to use a Caterpillar strap wrench, or another suitable tool, in order to turn the filters to the amount that is required for final installation. Make sure that the installation tool does not damage the filters. Do not overtighten the oil filter.Replacing the Engine Oil Filters During Engine Operation (Duplex Oil Filter System Only)
This filter contains hot, pressurized oil that can cause burns and fire hazards, which may result in bodily injury or death. Follow the instructions given in this Operation and Maintenance Manual and stop the engine if rapid air movement exists to blow the oil.
Illustration 4 g01356340
Duplex Oil Filter System
Left hand service
If the engine is equipped with duplex oil filters, the engine oil filter elements can be changed while the engine is in operation. This is useful if the oil filter elements require more frequent replacement than the engine oil.
Illustration 5 g01034883
Open the "FILL" valve for a minimum of five minutes in order to fill the oil filter elements that will not be serviced. The oil filters that will not be serviced must be full of engine oil. Close the FILL valve.
Move the control valve to the "AUX RUN" position in order to change the main oil filter elements. Move the selector valve to the "MAIN RUN" position in order to change the auxiliary oil filter elements.
Allow the oil pressure gauge for the oil filter that is being changed to reach a "ZERO" pressure reading.
Perform Step 1 through Step 5 of "Replacing the Engine Oil Filters During Engine Operation (Duplex Oil Filter System Only)".
Open the "FILL" valve for a minimum of five minutes in order to fill the new oil filter elements.
Close the "FILL" valve. Rotate the control valve to the "RUN" position for the oil filter that was serviced.
Inspect the oil filters for oil leaks. If any leaks exist, stop the engine and make any necessary repairs.
If the engine oil filters were replaced without changing the crankcase oil, maintain the oil level between the "FULL" mark and the "ADD" mark on the oil level gauge. If necessary, add oil. Fill the Crankcase
Only use oils that are recommended by Caterpillar. For the proper oil to use, refer to this Operation and Maintenance Manual, "Engine Oil" topic (Maintenance Section).
If the engine is equipped with an auxiliary oil filter system, extra oil must be added when filling the crankcase. If equipped with an auxiliary oil filter system that is not supplied by Caterpillar, follow the recommendations of the OEM.
Engine damage can occur if the crankcase is