MTS Series 249 Swivels - Manual (Page 32)

Series 249 Rod Swivel Product Manual 32
Adjusting Models 249.12/.20/.23/.32
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 procedures, and do not exceed the
specified backlash adjuster clamping torque.
Adjusting Models 249.12/.20/.23/.32
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. Loosen the swivel bearing clamping bolt.
4. With a spanner wrench, turn the backlash adjuster counterclockwise 5 to 10
degrees (as viewed from the top of the clamping bolt). This will increase the
size of the gap in the swivel eye, and decrease the clearance in the spherical
bearing when the clamping bolt is tightened.
5. Tighten the swivel bearing clamping bolt to the specified clamping torque
shown in the table “Clamping Torque and Bolt Type.” The clamping torque
should always be the same regardless of the adjuster setting.
Note The backlash adjuster must be in contact with the surface of the
spherical washer when the clamping bolt is tight. When the adjuster is
Clamping Torque and Bolt Type
M ODEL C LAMPING T ORQUE B OLT T YPE
N· M LBF · FT
249.12 34 25 Hex head bolt
249.20 110 84 Socket head cap screw
249.23 380 280 Socket head cap screw
249.32 920 680 Socket head cap screw
249.41 62 45 Superbolt Torquenut
249.42 62 45 Superbolt Torquenut
249.51 62 45 Superbolt Torquenut
WARNING