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1, the bolt torque is proper
engineering machinery in the process of dismantling, many parts of the bolt are torque requirements, such as excavator parts of transmission box, cylinder head, wheel hub, connecting rod and, in areas such as the front axle tightening torque has special provisions in the specification, must not optional change. But many users are mistaken for some will be more appropriate, but twist too tight will cause the screw or bolt broken, can also be caused by screw thread slipping fault.
2, grinding excavator accessories bearing bush picked the right tool
for some inexperienced mechanic, scraping tile is a difficult work, because the scraping tile technology hard to master, so the bearing shell is not easy to meet the technical requirements, therefore, when someone replacing bearing shell, to increase the contact area of bearing shell and crankshaft, with emery cloth grinding instead of blow. This method is highly desirable in the actual repair, because of the abrasive cloth is hard, and the bearing alloy is soft, so when grinding sand easily embedded in the alloy, the diesel engine work will accelerate journal wear, shorten the service life of the crankshaft.
3, tanks bring to ban add cold water
motor overload operation, heat dissipation is not good or deficiency can cause water tank water boiled, add cold water immediately if at this time, will lead to excavator parts of cylinder head and cylinder block. Therefore, once found in use boiled water tanks, emergency measures should be taken to stop operation, make the diesel engine cooling water to cool.
4, measuring cylinder clearance to carefully
when measuring cylinder clearance, not in the piston skirt is perpendicular to the direction of the piston pin hole measurement, and measurement in the other direction. on the structure characteristics of aluminum alloy piston is little big, is a cone, and the skirt section for elliptic, so along the circumferential direction of the cylinder clearance is not equal.
measurement, the regulations will be subject to the direction of the long axis of the ellipse clearance, namely the measurement of piston skirt clearance in vertical direction of the piston pin hole. Such measurement is more convenient, accurate, and in the reciprocating motion, excavator parts of piston skirt is perpendicular to the direction of the piston pin hole just wear away from the effect of lateral pressure is bigger, so the measuring cylinder clearance, should be vertical to the piston pin hole in piston skirt in the direction of the measurement.
5, avoid is not check the plunger stroke margin
a lot of maintenance personnel do not pay attention to check the plunger travel allowance. Plunger travel allowance, refers to the plunger is top of the CAM on the camshaft first check point after, can continue upward movement. When the screw out adjustment bolts or switch to a thicker after block, gasket, of the lower position of the plunger, reduce travel allowance of plunger. So, in the maintenance debugging excavator accessories for fuel pump, first check the travel allowance, to determine whether the fuel injection pump also allows for the adjustment.
6, oil due to replace
oil in use of diesel engine is indispensable, mainly plays a role of lubrication, cooling and cleaning, etc. As a result, many drivers will pay attention to the oil amount to check the oil, and add according to the standard. In the process of diesel engine operation, a lot of dirt will enter into the oil. If ignored the lubricating oil quality check and has deteriorated oil replacement, can lead to some excavator attachments are always in poor lubrication conditions, so as to accelerate the parts wear
if only add not in rush to put into use, it is easy to cause tile burning, holding shaft and other accidents.
7, it is strictly prohibited to open flame heating piston
for excavator parts of piston and piston pin is interference fit, so when installing a piston pin, should first make the piston thermal expansion, at this time, some of the maintenance personnel will put the piston on the flame heating directly, so it is very wrong, because each part of the piston, uneven heat bilges cold shrink degree would be different, firing can make the piston balance, easy to cause deformation; Also attach to ashes piston surface, reduce the service life of the piston if natural cooling after the piston reaches a certain temperature, its microstructure will be damaged and the wear-resisting performance is greatly reduced, its service life will be significantly reduced. When installing a excavator parts of piston pin, piston can be placed in hot oil evenly heating make its slow inflation, must not use open flame heating directly.
8, beat the butter's trouble
butter is commonly used in engineering machinery repair grease, can play the role of lubrication and seal. Therefore, some mechanic when installing a head gasket, mat in cylinder coated with a layer of butter, thought it can increase the tightness of diesel engine. It seems to do little imagine, affected the performance of diesel engine. If installed in excavator attachments cylinder MATS and butter, cylinder pad, cylinder head and the body plane between aperture, high temperature and high pressure gas cylinder pad, easily from this side destroy cylinder pad, cause air leakage. In addition, the butter for a long time in high temperature condition also will produce carbon deposit, cylinder pad premature aging metamorphism. So do not butter when install the cylinder pad.
9, steel sleeve and the piston according to the standard size installation
the pants cylinder sleeve and the piston, the thought that a new cylinder liner and piston are standard parts, are interchangeable, mount can use. In fact, excavator attachments of cylinder jacket with the size of the piston has a certain tolerance range. Change necessary to check the size of the standard cylinder liner and piston group code, with the cylinder liner and piston necessary to make the size of the piston group code and standard the size of the cylinder liner group code is the same.
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