MTS Series 249 Swivels - Manual (Page 34)

Series 249 Rod Swivel Product Manual 34
Adjusting Models 249.41/.42/.51
Maintenance
Do not loosen the jackbolts on the Torquenut without following the
instructions in Step 3 of 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.
3. Following the sequence shown below, loosen every third jackbolt one-
eighth turn at a time. Repeat this process until all of the jackbolts can be
turned by hand. This will prevent a single jackbolt from bearing the entire
load of the Torquenut
.
4. After all the jackbolts have been loosened, loosen the Torquenut on the main
thread by turning the nut by hand or with a bar inserted between the
jackbolts (do not damage the threads of the jackbolts).
5. With a spanner wrench, turn the backlash adjuster counter-clockwise 5 to 10
degrees (as viewed from the top of the Torquenut). 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.
6. Ensure that none of the jackbolts protrude through the base of the
Torquenut, and that the surface of the Torquenut rests smoothly on the
hardened washer. Tighten the Torquenut on the main thread by turning the
nut by hand or with a bar inserted between the jackbolts (do not damage the
threads of the jackbolts).
7. Hand-tighten each jackbolt to ensure even seating of the main thread.
8. Using the torque wrench, tighten the jackbolts in the sequence shown in the
figure below to 35 N·m (25 lbf·ft).
CAUTION