MANIFOLD-PUMP 7G8768 - Caterpillar

Illustration 1 g01344214
Lubrication System (1) Oil temperature regulator housing (2) Centrifugal oil filters (3) Piston cooling jets (4) Drilled passage in the cylinder block from the main oil gallery to the camshaft bearings (5) Turbocharger oil supply line (6) Turbochargers (7) Engine oil coolers (8) Oil drain lines for the turbocharger (9) Engine oil filters (10) Drilled passage in the cylinder block from the main oil gallery to the crankshaft main bearings (11) Change valve for the engine oil filter (12) Priority valve (13) Tube (14) Prelube pump (15) Engine oil pump (16) Suction bell
Illustration 2 g01344407
Engine Oil Pumps (14) Prelube pump (15) Engine oil pumpThe prelube pump (14) can be driven by either an electric motor or an air motor. The prelube pump provides oil in order to lubricate the engine bearings before the engine is started and after the engine is shut down. There are two prelube systems. The intermittent prelube system operates for a short period of time immediately before the engine is started. The continuous prelube system will operate continually when the engine is not operating. A one-way check valve is located in the line between the prelube pump and the oil manifold. The check valve prevents pressurized oil from the engine oil pump from going through the prelube pump after the engine is started. The Engine Supervisory System will not allow the engine to start until the engine has been prelubed, and the engine has had the minimum amount of lubrication.The lubrication system uses an external engine oil pump (15). The engine oil pump is mounted on the front left side of the front housing. Oil is pulled through suction bell (16) and suction tube (13) by the engine oil pump. There is a screen in the tube between the suction bell (16) and tube (13) .The engine oil pump pushes oil to the relief valve and the ports on the bypass valve of the priority valve (12). The relief valve opens in order to send oil back to the engine sump when the pressure in the engine oil pump exceeds 1000 kPa (145 psi). This helps to prevent damage to the lubrication system components when the engine oil is cold.The bypass valve opens in order to send oil back to the engine sump when the system pressure (pressure in the main oil gallery) exceeds 430 kPa (62 psi).