Period of notice new must first test run for a period of time, often called period.
Running-in purpose is to prevent premature mechanical wear, prolong service life.
1, engine running-in period should be 30% speed, load decrease 20%
2, when you start the engine, it is strictly prohibited to fierce bang accelerator, the engine should be preheated 20 - when starting at low temperature
50 seconds, then start;
After the engine idle speed running 3 -
5 minutes, cooling water temperature rise to 40 degrees can increase the speed and load.
3, excavator working 30 or 50 hours in front of the period of mining loose soil, each loading for 1/2 bucket capacity, after 70 or 50 hours of charge can be gradually increased, but not more than three-quarters of the bucket capacity, and appropriately reduce the operation speed.
4, adjust period should always pay attention to the workings of the excavator's institutions, check each bearing, gear, and the working temperature of friction pair, the observation of the hydraulic system with and without leakage phenomenon;
The abnormal phenomenon in operation it is necessary to stop the machine immediately to check the reason, and to be ruled out.
5, after running-in period should be based on the workings of the running-in period of excavator attachments
for inspection, adjustment and lubrication;
At the same time check the gear lubricating oil of hydraulic oil and hydraulic oil tank cleaning, when it is necessary to replace.
Implement a regular excavator maintenance aims to reduce the drivers fault, prolong the service life of the excavator.
But in the process of practical maintenance, mining machinist tend to maintain is not good, so as to maintain the became & other;
Damage & throughout;
These and other
Harm & throughout;
Drivers would never do: 1, the oil only in not ignore lubricating oil quality inspection and to have metamorphic engine oil replacement, causing some engine's moving parts are always in poor lubrication conditions, so as to accelerate the wear parts.
2, butter, indiscriminate use besmear butter, if installed in the cylinder fitted when the cylinder head bolt is tightened, part of the butter will be squeezed into the cylinder in the channel and the oil duct, stay on the combination of the cylinder block and cylinder head, cylinder pad, cylinder head and the body plane between aperture, high temperature and high pressure gas from impact cylinder pad, easily damaged cylinder pad and cause leakage.
3, do not check in the maintenance debugging fuel injection pump plunger stroke allowance, first check the travel allowance, to determine whether the fuel injection pump also allows for the adjustment.
Check, should according to the different structure of fuel injection pump USES the following different ways: a)
Rotate the camshaft, plunger tip after the first check point, remove the oil valve and valve seat, measured with vernier depth.
Plunger is after the first check point, use a screwdriver to pry up the plunger spring spring seat, make the piston rises to a peak.
And then insert a feeler gauge between the tappet adjustment bolts under the plunger surface and measurement.
Standard of plunger travel allowance is about 1.
5 mm, wear after the limits of travel allowance should not be less than 0.
4, with emery cloth grinding bearing shell when some people replacing bearing shell, to increase the contact area of bearing shell and crankshaft, with emery cloth grinding instead of tile, this method is highly desirable in the actual repair, because of the abrasive cloth is hard, and the bearing alloy is soft, diesel engine work will accelerate journal wear, shorten the service life of the crankshaft.
5, cylinder liner and piston product without matching that installing a change in the cylinder liner and piston, people might think that the new cylinder liner and piston are standard parts, are interchangeable, mount can use.
In fact, the size of the cylinder liner and piston has a certain tolerance range.
Such as the maximum size of the jacket with the minimum size of the piston, can make the fit clearance is too large, causing compression is weak, and start the difficulties.
Change, therefore, must want to check the size of the standard cylinder liner and piston group code, equipped with standard of cylinder liner and piston must make the size of the piston group code and the size of the standard cylinder liner group code is the same, only in this way can ensure a standard fit clearance between.
6, bolt screw too tight construction machinery in the process of dismantling, many parts of the bolt are torque requirements, such as 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 security, but twist too tight will cause the screw or bolt broken, can also be caused by screw thread slipping fault.
7, flame heating due to the 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.
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 piston pin, piston can be placed in hot oil evenly heating make its slow inflation, must not use open flame heating directly.
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