Important factors affecting the oil pressure of the loader

During the working process, if the pressure of the oil is lower than 0.2MPa (or fluctuating with the engine speed), stop the machine immediately to find the cause, and continue to work after the fault is eliminated, otherwise it will be burnt and pulled. Major mechanical accidents such as cylinders. The main reasons for the low oil pressure are as follows.

(1) Insufficient oil quantity

If the amount of oil is insufficient, the pump oil of the oil pump will decrease, causing the oil pressure to drop, which will aggravate the wear of the crankshaft and the bearings, cylinder liner and piston.

(2) Engine temperature is too high

If the engine temperature is too high, not only will the engine oil age and deteriorate, but also the oil will be thinned, resulting in a drop in oil pressure.

(3) The oil pump stops or the pump oil is insufficient.

When the driving gear of the oil pump and the fixing pin of the drive shaft are broken or the mating key is detached, and the oil pump sucks the foreign matter and the pump oil gear is stuck, the oil pump stops, and the oil pressure is also reduced to zero.

When the gap between the pump shaft and the bushing of the oil pump, the gap between the gear end face and the pump cover, the flank clearance or the radial clearance exceeds the allowable value due to wear, the pump oil amount is reduced, resulting in a drop in the oil pressure.

(4) The clearance between the crankshaft and the connecting rod bearing is too large

After the engine is used for a long time, the clearance between the crankshaft and the connecting rod bearing will gradually increase, and the oil pressure will also decrease.

(5) Oil filter is blocked

When the oil cannot be circulated due to the clogging of the oil filter, the safety valve provided on the base of the oil filter is opened, and the oil directly enters the main oil passage without being filtered. If the opening pressure of the safety valve is adjusted too high and the oil filter is blocked, the safety valve cannot be opened in time, so the pressure of the oil pump rises, the internal leakage increases, and the oil supply of the main oil passage decreases, causing the oil pressure to drop.

(6) The return valve is damaged or malfunctions

If the spring of the return valve spring is softened or improperly adjusted, the mating surface of the valve seat and the steel ball is worn or caught by the dirt and the closing is not strict, the oil return amount is obviously increased, and the oil pressure of the main oil passage is also decreased.

(7) oil radiator or pipeline oil leakage

Oil leakage from the oil radiator and piping will cause the oil pressure to drop. If the pipeline is clogged with dirt, the flow rate of the oil will decrease and the oil pressure will decrease due to the increase in resistance.

(8) Oil pressure sensor failure or tubing blockage

If the oil pressure sensor fails, or the oil pipe from the main oil passage to the oil pressure sensor is not circulated due to dirt accumulation, the oil pressure gauge will show that the oil pressure drops.

(9) Oil absorbing plate blocked

If the oil is too dirty and too sticky, it will easily block the oil suction pan. When the engine small throttle is running at low speed, the oil pump does not absorb much oil, the main oil passage can still establish a certain pressure, the oil pressure will be normal; but when the throttle is increased at high speed, the oil absorption of the oil pump will be affected by the suction resistance. Large and significant reduction, which in turn causes the display value of the oil pressure gauge to drop.

(10) The oil grade is incorrect or the quality is unqualified.

Different models of engine must be added with different oils. Different models of oil should be used in different seasons. If the oil grade is wrong, the engine will increase the leakage due to the low viscosity of the oil, which will reduce the oil pressure.

(11) Pressure regulator setting pressure is low

If the pressure regulator is set to a low oil pressure, the oil cannot be efficiently delivered to each lubrication location, causing mechanical failure. If the oil pressure is too high, it will increase fuel consumption, increase the load on the oil pump and lubrication parts, damage the oil circuit seals and cause oil leakage.

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