Common troub leshooting for used excava excavator tor With the continuous development of high-grade highways, used excavator plays an important role. Here is the hydraulic excavator purchased in the past few years, the process of vehicle speed, the use of basic good, but there have been several minor faults, the specific performance of the engine work for the weak and the water temperature is too high. Is the failure to ruleout the possibility, analysis of the following: 1) the engine is inefficient The used excavator engine is inefficient mainly du e to fuel system problems, failure is characterized by: engine idling normal,with the performance after the load is unable to work, the engine sound of nausea, engine flameout so easy , troubleshooting isas follows:
First, open open the hand pump, pump, the system is not air, air, is working properly, properly, then replace the fuel filter thickness, the smaller the engine load leveling work normal working hours, but under heavy load operation, is still not normal. In response, som e people believe that high-pressure fuel supply to less than an analysis that is the oil line failure, so the filter to remove the oil pump tubing between the check and found that aging rubber tube. Meanwhile, the first hollow tube bolts of the small screen clogged. This proved to be poor due to the formation of cutting oil supply, resulting in inadequate fuel supply, solid work inability caused by excavators to replace tubing whil e cleaning * clearance center screw, working back to normal. used excavator excavator in the no-load operating normally, normally, but when in the Excavation Excavation black smoke, unable to work. Checkmethod: First check the fuel supply system, the result was normal, showing no problem with the engine itself; been observedthat the exhaust pipe Department more coke, so that the exhaust resistance is too large, resulting in decreased power and blacksmoke. Open the muffler, remove carbon deposit returned to normal after the work, but still ha ve the black smoke emission,then carefully observed that the air filter vacuum indicator showing red, indicating need for cleaning or replace the filter, but thereplacement of several new filter core, the engine or th e black smoke, the air filter or vacuum indicator showing red, then foundthat poor intake, then find out down the inl et and found the air thick filter network has been catkins and other debris blockingdead, clean up * Net, the engine returned to normal work.
2) engine water temperature is too high, an alarm buzzer alarm information; Analysis generated by the engine overheating reasons of used used excavator: 1.
excessive heat. The reason is when when the engine is bad, fire late; fleeing fleeing into the combustion chamber of diesel oil orinjected into excess; long work overload caused by hydraulic oil t emperature is too high. On the engine integrated observationsto exclude the above reasons. engine started running smoothly, the work of half an hour later overheat alarm, it s eems there areother reasons. 2. insufficient cooling. Due Due to water shortage, shortage, water water is running; running; poor water quality, quality, water water mixed with with oil, reduce the thermalconductivity; produce large scale water mark, seriously affect the heat; water mixed with gas reduce the heat capacity;thermostat bad, not great cycle of opening; mud sand, rust skin, scale and other impurities to plug the water tank; radiator grille are the branches, insects, debris blocking sediment; pump bad; fan belt loose leaf deformation in forced cooling fan isinadequate. Reference to the above reasons, used excavator was carefully examined in consultation with the manufacturers service department. For just one year to determine thermostat should be normal, the tank is r ust-free antifreeze and oil, etc. Failure to exclude the possibility exists. Reason for the existence of the o utside world, after careful investigation, first of all the fan belt tension adjustment to the appropriate degree, they carry a washing machine on the water tank and hydraulic oil radiator for a thorough cleaning, remove the grille on the sludge, after the insects and other debris , radiator in a ppearance as good as new,to enter the site work for a period of time, the effect some changes, overheating alarm time extended from the original half-hour half day or so, b asically about 4 hours continuous work, it is still overheating, we Also the engine was examined and lateradverse judgments or heat, so the analysis of the cooling system, cooling system tank and hydraulic oil radiator together,completely sealing the middle with a sponge. Between this judge may have debris blocking, then open the sponge was found between the water tank and hydraulic oil cooler are catkins plug, remove a large load after a long period of operation, no further overheating. Subsequent analysis of such phenomena: a look inside the engine exhaust, the wind was fierce, falling in a catkin environment construction, wind the engine to inhale the water tank with all catkin grille, seen from the appearance of Hydraulic oil radiator is to remove the last of the debris, but not easy to s ee inside the water tank. To this end we have from time to tim e to clean between their checks had been no water temperature is too high
