During the operation of the loader, if the oil pressure is lower than 0.2MPa (or rises and falls with the change of engine speed), stop the machine immediately to find out the cause, and continue to work after troubleshooting, otherwise major mechanical accidents such as Bush burning and cylinder pulling will occur. The main reasons for low oil pressure are introduced as follows.
(1) Insufficient oil
If the oil quantity is insufficient, the oil quantity of the oil pump will be reduced, resulting in the decrease of the oil pressure, which will aggravate the wear of the crankshaft and bearings, cylinder liners and pistons.
(2) Engine temperature too high
If the engine temperature is too high, it will not only accelerate the aging and deterioration of the oil, but also easily dilute the oil, resulting in a drop in oil pressure.
(3) The oil pump stops running or the pump oil volume is insufficient
The fracture of the fixed pin between the drive gear of the oil pump and the drive shaft or the falling off of the matching key, as well as the seizure of the pump gear due to the suction of foreign matters by the oil pump, will stop the operation of the oil pump and reduce the oil pressure to 0. When the clearance between the oil pump shaft and bushing, the clearance between the gear end face and the pump cover, the tooth side clearance or radial clearance exceeds the allowable value due to wear, it will lead to the reduction of pump oil volume and the result of oil pressure drop.
(4) The fit clearance between crankshaft and connecting rod bearing is too large
After long-term use of the engine, the fit clearance between the crankshaft and connecting rod bearings will gradually increase, and the oil pressure will also decrease.
(5) Blocked oil filter
When the oil cannot flow due to the blockage of the oil filter, the safety valve on the base of the oil filter is pushed open, and the oil will enter the main oil passage directly without filtration. If the opening pressure of the safety valve is adjusted too high, the safety valve cannot be opened in time when the oil filter is blocked, so the pressure of the oil pump increases, the internal leakage increases, and the oil supply of the main oil passage decreases, causing the oil pressure to drop.
(6) The oil return valve is damaged or out of order
If the spring of the oil return valve is fatigued and softened or improperly adjusted, and the mating surface of the valve seat and is worn or stuck by dirt and cannot be closed tightly, the oil return volume will increase significantly, and the oil pressure of the main oil passage will also decrease.
(7) Oil leakage from oil radiator or pipeline
The oil radiator and pipeline leak oil, which will reduce the oil pressure. If the pipeline is blocked by dirt, the oil flow will decrease and the oil pressure will decrease due to the increase of resistance.
(8) Oil pressure sensor failure or oil pipe blockage
If the oil pressure sensor fails, or the oil pipe from the main oil passage to the oil pressure sensor is blocked due to dirt accumulation, the oil pressure gauge will show that the oil pressure drops.
(9) Oil suction cup blocked
If the oil is too dirty and sticky, it is easy to block the oil suction pan. When the engine runs at a low speed with a small throttle, the oil pump does not absorb much oil, and a certain pressure can be established in the main oil passage, and the oil pressure will be normal; However, when the throttle is increased and the engine operates at a high speed, the oil suction capacity of the oil pump will be significantly reduced due to excessive suction cup resistance, resulting in a decrease in the displayed value of the oil pressure gauge.
(10) Wrong brand or unqualified quality of engine oil
Different types of engine oil must be added, and the same type of engine oil should also use different brands in different seasons. If the oil grade is wrong, the leakage will be increased due to the low viscosity of the oil when the engine is running, thus reducing the oil pressure.
(11) The set pressure of pressure regulating valve is low
Jinan loader rental manufacturer believes that if the pressure regulating valve is set with low oil pressure, the oil can not be effectively delivered to all lubricating parts, resulting in mechanical failure. If the oil pressure is too high, it will increase the fuel consumption, increase the load on the oil pump and lubricating parts, damage the oil circuit seals and cause oil leakage.
The above is all about the problems and precautions introduced to you today. I hope it can help you. If you want to know more, you can contact us by phone or follow our website http://www.ycgjglcl.com , our staff will contact you in time.