Diesel Engine Used Oil Pumps 3D84 3D88 4D84 For Excavator 129006-42002

3D84 3D88 4D84 4D88 Used Oil Pumps PC35 PC40 PC55 129006-42002

Specification

Description

Oil pickup pipe

The oil pump sucks oil up from the sump through a pipe - called a pickup pipe. The pipe’s nozzle sits below the surface of the oil, and it is covered by a guaze filter which prevents large particles from being sucked up into the pump.

If this filter screen was to be completely blocked, then the engine would not pick up any oil and the engine would at great risk of being destroyed. Therefore the pickup pipe may have bypass valve in case the screen is blocked. In this situation it’s better that the engine continues to receive oil and we take the chance of damage to the oil pump: an oil pump is considerably cheaper than an engine rebuild.

Oil pumps

Most oil pumps are driven directly by the crankshaft. The pump illustrated here sits over the nose of the crankshaft where its internal gear is driven directly.

All oil pumps are called positive displacement pumps - the amount of oil that leaves is the same as that enters. In other words, the pump moves oil from one side, to the other. This can be contrasted with a coolant pump, for example, which tries to move water but will not do so if the pressure is too great on one side.

As engine RPM increases, the pump turns faster and more oil is pumped. This is convenient because at higher engine speeds lubcrication and cooling requires a greater flow of oil.

Working Principle

The oil pump is inevitable in an engine for lubrication as engines need to be properly lubricated when it’s running. The oil pump is usually a gear-driven from the crankshaft which start pumping oil immediately the engine is running. In some oil-free engines like a two-stroke, oil injectors are not used.

From a strainer, oil passes into the oil pump and then flows through the heat exchanger, where it’s cooled. The cooled oil then flows through the galleries to the moving parts of the engine before returning to the sump. If an engine is designed with an injector, a small portion of oil is diverted to it.

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