MTS Series 249 Swivels - Manual (Page 35)

Adjusting Models 249.41/.42/.51
Series 249 Rod Swivel Product Manual Maintenance 35
It will be necessary to torque each jackbolt several times, because the
preceding jackbolts will loosen as the subsequent jackbolts are torqued.
Using the same method, torque each jackbolt to a final clamping torque of
62 N·m (45 lbf·ft).
9. Apply hydraulic pressure and check for backlash using the methods
described in “Checking for Swivel Bearing Backlash.”
Note The increased amount of force that will be required to rotate and tilt the
swivel when it is set to an extremely tight backlash adjustment can
introduce unwanted forces into the testing system. Therefore, setting the
adjuster so that it just barely contacts the spherical washer when fully
torqued should not be considered the optimum backlash adjustment
setting. The optimum setting is determined by the performance
requirements of the testing system.
10. If unacceptable backlash is still observed, repeat Steps 1 through 9 until it is
eliminated.
Note The backlash adjuster must be in contact with the surface of the
spherical washer when the Torquenut is tight. When the adjuster is
loose, the bearing is clamped too tightly and the clamping bolt can fail in
fatigue. Find and correct the source of the problem before continuing.