SHAFT 7G7047 - Caterpillar

Illustration 1 g00301554
Engine Lubrication System
(1) Reduced pressure
(2) Splash and drain
(3) Plate type oil cooler (if equipped)
(4) High pressure passages
(5) Cooling lines for water
(6) Engine oil pump
(7) Suction side
(8) Oil filter
(9) Canister type oil cooler (if equipped) 3054 Engine Pressure for the lubrication system is supplied by a engine oil pump (6) which uses rotors. The engine oil pump is driven by an idler gear. The crankshaft gear drives the idler gear. The engine oil pump has an inner rotor and an outer rotor. The axis of rotation of the rotors are off-center relative to each other. There is a key between the inner rotor and the drive shaft. The inner rotor has six lobes which mesh with the seven lobes of the outer rotor. When the inner lobe rotates, the distance increases between the lobes of the outer rotor and the lobes of the inner rotor in order to create suction. When the distance decreases between the lobes, pressure is created. Lubricating oil from the oil pan flows through a strainer and a line to the suction side (7) of the engine oil pump. The lubricating oil flows from the outlet side of the pump through a line to a relief valve. The relief valve is installed near the bottom of the left side of the cylinder block. The relief valve on the engine oil pump opens if the oil pressure is too high. The lubricating oil which flows through the relief valve is returned