By a large number of outer spherical bearing failure analysis studies have shown that the spherical bearing short-lived or premature loss of accuracy, some due to defects in material or manufacturing improper, but to a large extent on the absence of strict accordance with the requirements of bearings for installation , maintenance, or improper bearing selection or actual load exceeds the rated load of the bearing itself causes abnormal bearing damage, for example, fatigue spalling of the bearing parts is largely caused by lubricating oil mixed with impurities.
Detect when the first outer spherical bearing cap open, the choice of the appropriate diameter of the lead wire to be cut into small pieces 15 to 40 mm long, in the journal on the upper and lower bearings at the interface, cover with bearing cap torque required to tighten fixed bolts, then loosen the bolts, remove the bearing cap, galvanized wire thickness with a micrometer detection flattened, the calculated average of the spherical bearing top clearance. If the tip clearance is too small, the binding surface in the upper and lower watt padded. If too large, less pad, scraping or re-poured watts.
Pad clamping force adjustment: in order to prevent rotation and axial movement of bearing pads may occur in the work process, in addition to fit interference and the stopper part, the pad must also with the outer spherical bearing cap to compress, measurement method, and the measured tip clearance method, to measure the thickness of soft galvanized wire, available computing bush tightening force (represented by the amount of elastic deformation of the pad after compression)
General bearing the pressing force of 0.02 to 0.04 mm. Pressing force does not meet the standard, can be used to increase or decrease the outer spherical bearings and bearing shim thickness at joints to adjust tile back allowed padded.
Spherical bearings to ensure radial clearance should also ensure that the axial clearance. Detection axial clearance, the axis is moved to an extreme position, and then use a feeler gauge or dial indicator measuring axis from one extreme position to the other extreme position runout ie axial gap.


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