MTS Series 249G2 Swivels - Manual (Page 30)

Series 249G2 Swivels 30
Considerations For Superbolt Torquenuts
Maintenance
5. Apply hydraulic pressure and check for backlash using the methods
described previously.
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.
6. If unacceptable backlash is still observed, repeat Steps 1 through 5 until it is
eliminated.
Considerations For Superbolt Torquenuts
The Model 249xx.M500 through 249xx.M1550 Swivel assemblies use a
Superbolt Torquenut as the clamping bolt, instead of the standard bolt used in the
smaller swivel assemblies. The method used to tighten and loosen the Torquenuts
is included in the following procedure.
An ordinary torque wrench and an appropriate size hex key socket are the only
tools required to loosen or tighten the jackbolts on a Torquenut.
Do not loosen the jackbolts on the Torquenut without following the
instructions in this procedure.
Damage to the hardened washer can occur if the jackbolts are not loosened
evenly and in the proper sequence.
Ensure that the jackbolts are not loosened more than one-eighth turn at a time,
and that the proper loosening sequence is followed.
Jackbolts
Main thread
Top View
Side View
Jackbolt
Torquenut
Hardened washer
Spherical washers
Swivel