Clearance of needle roller bearings and shaft must be appropriate, detection can be used the following method for radial clearance.
　　1, game testing method
　　For larger diameter needle bearing, a large gap between them, with narrow feeler gauge direct detection. For smaller diameter bearings, a small gap between not measured with feeler gauges, but clearance of the SKF bearings, must be measured with appropriate feeler gauge thickness.
　　2, lead testing law
　　Lead testing method for accurate detection of bearing clearance with a feeler gauge, but more trouble. Testing with the aluminium wire should be soft, not too big or too small in diameter, the ideal diameter is 1.5~2 times the gap, real work usually done with a soft wire detection.
　　Detection Shi, first put FAG bearings cover open, selection appropriate diameter of wire, will its stopped into 15~40 mm long of small paragraph, put in axis neck Shang and the upper and lower bearing points interface Department, cover Shang bearing cover, by provides torque twist tight fixed bolt, then in twist pine bolt, remove bearing cover, with micrometer detection pressure flat of wire thickness, please out bearing top gap of average.
　　If the gap is too small, you can pad on the upper and lower joints. If too large, shave down the mat, the Institute, or pouring again.
　　Bush tight force of adjustment: to prevent Bush in work process in the may occurred of turned and axis to mobile, except tie had ying and ended moving parts outside, Bush also must with NSK bearings cover to pressure tight, measurement method and measuring top gap method as, measured soft wire thickness outside, available calculation out Bush tight force (with Bush compression Hou of elastic deformation volume to said)
　　General bearing clamping force at 0.02~0.04 mm. If the clamping force is not up to standard, you can increase or decrease in needle roller bearing and the bearing seat gasket thickness jiehe Mian methods to resize, tile back-no pad.
　　TIMKEN bearings other than to ensure that the radial clearance, should also ensure that the axial clearance. Axial clearance is detected, the axis moves to an extreme position, and then using a feeler gauge or dial gauge measurement axis from one extreme position to another location of the play that axial clearance.
　　When the clearance of needle roller bearings do not meet the requirements, should be adjusted. INA bearings often use shims to adjust the radial clearance (gap).



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