MTS Series 249G2 Swivels - Manual (Page 28)

Series 249G2 Swivels 28
Adjusting Backlash
Maintenance
Tightening the swivel bearing backlash adjustment beyond recommended
levels can significantly increase the heat and friction produced by the
swivel during operation.
Increased heat and friction on the swivel assembly can cause the bearing to
fail and result in damage or injury to equipment and personnel.
Carefully follow the backlash adjustment procedure, and do not exceed the
specified backlash adjuster clamping torque.
If backlash is observed using one of the methods discussed in the previous
section, complete the following procedure to remove the backlash.
1. Position the swivel in a secure, convenient, static position that allows access
to the swivel adjuster and clamping bolt. Ensure that hydraulic hoses and
servovalve cables are properly connected.
2. Remove hydraulic pressure from the system.
3. Turn the adjuster out until contact is just made with the spherical washer.
4. Torque the clamping screw to its full value as shown in the following table.
When properly set with zero backlash, the torque to swivel the eye should
be within the range shown in the following table. If it is not, the clamping
screw should be untorqued and the adjuster repositioned. If the torque to
swivel the eye was too high, turn the adjuster counterclockwise decreasing
the gap between it and the spherical washers. If it was too low, turn the
adjuster clockwise increasing the gap. Never set a swivel with the adjuster
extended to force the eye open.
If the swivel used the Superbolt Torquenut, refer to “Considerations For
Superbolt Torquenuts” on page 30 for additional information.