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John Deere – 1023E, 1025R and 1026R – Lubrication System Theory of Operation

Theory of Operation
The pressure lubrication system consists of an oil strainer, positive displacement oil pump, oil pressure regulating valve, full flow oil filter, and an electrical pressure warning switch.

The oil pump draws lubrication oil from the oil pan through a strainer and a suction tube. The oil is then pumped through an oil passage to the oil filter and through the engine block main oil galley.

From the main oil galley, oil is forwarded under pressure to the intermediate gear shaft and crankshaft main bearing journals. Drilled cross-passages in the crankshaft distribute the oil from the main bearings to connecting rod bearings.

Lube oil holes in main bearing oil grooves direct oil to the camshaft bearings.

A drilled passage from the rear camshaft bearing through the cylinder block and cylinder head supplies lubricating oil to the rocker arm bearings. The hollow shaft distributes oil to the rocker arms, cam followers and valves.

Lubrication oil is supplied to the fuel injection pump from the main oil galley.

An oil pressure switch activates an indicator light to alert the operator if oil pressure drops below specification.