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excavator attachments of the lubrication system is mainly composed of the oil pan, oil pump, oil filters, radiators, oil, points out of the main oil and low oil pressure alarm sensor, oil high oil temperature alarm sensor, pressure limiting valve with a bypass valve. Low oil pressure basically has the following several reasons:
1, oil oil shortage
if the oil oil amount is insufficient, will reduce amount of pump oil machine excavator parts oil pump or by entering the air pump oil, the oil pressure drop, the crankshaft and bearing, cylinder liner and piston will aggravate wear due to bad lubrication. Therefore, we should check the oil level in oil pan before work every day, ensure the oil level is normal, when should add the same manufacturer to produce the same type of oil.
2, excavator parts oil pump does not turn
if the oil pump drive gear and drive shaft flat key damage or loss; Set filter damaged the oil pump suction foreign body, the gear is jammed, can make oil pump stops, the oil pressure drop to zero. At this point a damaged flat key or set filter should be replaced.
3, oil pump wear
oil pump pump shaft and the excavator parts clearance between the sleeve, the clearance between the pump cover and end face gear, gear side clearance, or due to abrasion radial clearance is too large, will lead to pump oil decreases, and makes oil pressure drops. At this point should replace worn parts, grinding plane inside the pump cover, the clearance between the gear end face and make it back to the standard range.
4, engine temperature
if there is excessive engine cooling system scale, insufficient heat dissipation, long time overload operation or excavator parts of the fuel injection pump fuel supply time too late, can make the engine overheating, accelerate the aging of the oil, metamorphism, become loose, leakage from the tolerance clearance, lower pressure. Should remove scale, adjust fuel supply time, to keep the engine work within the rated load.
5, set filter clogging
under normal circumstances, when the oil pressure in the gas should be higher than small throttle, but sometimes also can appear abnormal situation. If the oil dirty, sticky, easy to plug set filter. When the engine small throttle speed, as a result of the excavator parts oil pump, oil absorption is the main oil way to establish a certain pressure, it is so normal oil pressure; But when step on the gas in high speed, an oil absorption of oil pump will set filter and significantly reduce the resistance is too high, so because of the shortage of lubricating oil in oil, the oil pressure gauge in value instead of down. The oil suction filter, should be cleaned or replaced.
6, damage to the bypass valve,
in order to keep the main oil passage of normal hydraulic equipped with by-pass valve, if the pressure regulating spring softening or improper adjustment, excavator accessories seat and ball matching surface wear or stuck and closed lax, oil return quantity increase, the main oil pressure drops. At this time should remove the by-pass valve inspection, and then the pressure to adjust to the normal range.
7, oil radiator leak
leakage will contaminate engine surface and pressure drop; Make the oil leakage into the water tank, cooling system of heat dissipation effect, engine overheating, oil is thinning, pressure drop. Remove the radiator, repair or replacement, restore its function.
8, excavator parts pressure limiting valve set pressure is too low
in the lubrication system, oil pump pumping oil, before reaching the engine lubrication components necessary to ensure the proper pressure. If the pressure limiting valve set pressure is too low, pressure regulating spring softening or leak sealing surface, can cause the set pressure is too low. At this time should be adjusted pressure limiting valve pressure returned to normal.
9, oil brand inappropriate
different engines need to add a different type of oil, the same type of engine in different season also should choose different type of oil. If choose inappropriate oil or inferior oil, when the engine is running will be due to the low viscosity increased leakage, pressure drops. Should be correct and reasonable selection of the oil, to adapt to the different models or season.
10, oil pressure sensor failure or road congestion
if excavator parts or main oil pressure sensor failure way to road congestion and oil pressure sensor is confusing, the oil pressure drops. To do the following check: engine idle running, loosen hose connector, observing the condition of the oil flow, judge the fault parts, replace the pressure sensor or cleaning oil.
11, oil filter clogging
when oil filter clogging and cannot flow, located in the base of the bypass valve is opened, the oil filter without direct access to the main oil passage. If the by-pass valve opening pressure is set too high, when the excavator parts oil filter is blocked will not be able to open in time, oil pump pressure will increase, the leak will increase, the main oil passage of oil decreases, and the oil pressure drops. Should guarantee the oil filter clean; Properly adjust the by-pass valve opening pressure, timely replacement or repair the damaged components or mating surface, restore its normal work performance.
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