1 when the new pump is used, because the pump cavity is filled with corrosion inhibitor, if the corrosion inhibitor solidifies at this time, it is easy to jam the plunger and oil volume adjusting sleeve and other precision coupling parts in the distribution pump, resulting in no oil output Therefore, the corrosion inhibitor must be discharged before use Then fill diesel oil from the oil inlet joint for many times, turn the spline shaft sleeve, rotate according to the rotation direction of the diesel engine, and constantly pull the speed regulating rocker arm to lubricate the surface of precision coupling parts such as plunger, oil volume adjusting sleeve, distribution rotor, etc., until the action is flexible and the oil is discharged from the oil outlet joint.
The oil inlet strainer at the oil inlet joint of 2 distribution pump is blocked.
3 due to the impact of high-pressure oil on the hexagon socket bolt on the distribution rotor, and the rotation direction is opposite to the thread direction, it is easy to loosen the bolt and leak oil, resulting in the distribution pump not supplying oil This kind of oil leakage is generally invisible during external inspection, so this factor should be considered when other parts of the pump are normal and still do not supply oil At this time, remove the sliding vane oil transfer pump body, remove the eccentric ring and sliding vane, and tighten the hexagon socket bolts.
4 the wear between the distribution rotor and the sleeve is large, which will reduce the oil pressure and reduce the oil supply of the oil pump At this time, if the effect of increasing the oil supply is still not ideal, the new parts should be replaced in time.
5. The diesel used is not clean, causing the oil circuit to be blocked, and the distribution rotor and sleeve are stuck and locked.
6. The sliding plate of the sliding plate oil transfer pump is worn or broken A simple method to judge whether the two-stage low-pressure sliding vane oil transfer pump in the distribution pump works normally on the diesel engine is to remove the bleeder screw on the distribution pump housing and connect a pressure gauge When the diesel engine is at a low throttle (the running speed is about loor/min), the reading of the pressure gauge shall not be less than 0.15mpa Otherwise, it means that the oil transfer pump is not working normally When checking the pressure of the fuel transfer pump on the diesel engine, sometimes the phenomenon of low speed and normal high speed occurs The reason is that the plunger on the cover of the sliding vane oil pump and the pressure control valve is stuck at the position of opening the oil drain hole At this time, the pressure is often lower than 0.08mpa, and the starting oil volume of the oil pump is significantly reduced, making it difficult to start The pressure is normal at high speed because the plunger is stuck at a position that will not exceed the position where the oil drain hole is opened under normal conditions, so it has little effect on the oil delivery pressure of the oil transfer pump at the highest idle speed
The fuel supply volume of excavator fuel injection pump is adjusted as follows:
1 when adjusting the fuel supply at the rated speed, make the fuel injection pump run at the rated speed, rotate the control arm at the maximum fuel supply position, and observe the fuel supply of each cylinder when measuring the fuel injection for 100 times If it does not meet the technical requirements, loosen the clamping screw of the adjusting gear ring or the plunger fork, move the plunger control sleeve relative to the adjusting gear ring or the plunger fork relative to the adjusting rod for a distance, and then fix the screw to change the oil supply
2 when adjusting the idle fuel supply, the fuel injection pump operates at idle speed and slowly rotate the control arm in the direction of increasing the fuel supply When the fuel injector starts to inject fuel, fix the control arm and inject fuel for 100 times Observe the fuel injection quantity. If it does not meet the technical requirements, adjust it according to the above methods
3. The common speed fuel supply is the fuel supply of the fuel injection pump at 600 ~ 800 rpm During adjustment, make the fuel injection pump run at 600 rpm; Turn the control arm to the end in the direction of maximum fuel supply, and observe the fuel supply when injecting 100 times If it does not meet the requirements, adjust the full load oil supply adjustment screw. After the oil supply meets the requirements, adjust the oil supply of each sub pump separately to make it meet the requirements of uniformity.
Inspection and adjustment of excavator governor:
1 regularly check whether the moving parts of the governor are flexible and whether they are stuck Stuck parts will lead to governor failure, unstable speed and "runaway".
2. If the governor parts are worn, the axial clearance of the governor sliding disc will increase. You can add a paper pad of about 1mm between the governor sliding disc and the thrust bearing for adjustment.
3 adjustment of engine speed Turn the length of the adjusting screw on the connecting rod to change the tension of the tension spring When the stop screw is screwed in, the spring is loosened and the speed of the diesel engine decreases; When the adjusting screw is screwed out, the spring is tensioned, and the diesel engine speed is increased by D. when adjusting, it is best to cooperate with the tachometer.
