35
Mount fixtures
Product Support:
4. Loosen the Superbolt tensioners as follows:
Caution
Follow strict procedures for Superbolt tensioners! Jackbolts must be unloaded gradually. If
some jackbolts are fully unloaded prematurely, the remaining jackbolts will carry the entire
load and may be hard to turn. With extreme abuse, a jackbolt tip can deform making
removal difficult.
a. Spray all jackbolts on the crosshead with penetrating oil or hydraulic oil, especially if frame is in a
corrosive environment.
b. For a given Superbolt tensioner, loosen each jackbolt one-quarter turn, moving in a circular
pattern around the tensioner (see View A of
) (use hex socket and ratchet
wrench). As you move around and get back to the first jackbolt, it will be tight again. Go only
once around the tensioner. Repeat this step for EVERY tensioner on the crosshead. In other
words, if the crosshead has six tensioners, perform the circular loosening pattern on each of the
six tensioners before continuing.
c. Repeat step
for a second loosening round of all jackbolts on each tensioner.
d. Repeat step
again for a third loosening round of all jackbolts on each tensioner.
e. In a final pass, fully loosen the jackbolts of each tensioner. It is normally not necessary to
remove the tensioners from their studs; however, if it is time for scheduled maintenance, then
unthread the tensioners from their studs. Refer to
for recommended
maintenance schedule and procedures.
5. Operate the hydraulic cylinder until the crosshead is in the desired position.
6. Tighten the crosshead Superbolts as follows:
a. If the tensioners were removed from their studs for maintenance, thread each tensioner onto a
stud until it seats against the washer, then back the tensioner off one-half turn.
b. For a given Superbolt tensioner, hand tighten four jackbolts at 90 degrees apart (see View B of
). Go only once around the tensioner. Repeat this step for EVERY tensioner on the
crosshead.
c. Tighten the same four jackbolts to 50% of target torque (see
for target torque) (use hex
socket and torque wrench). Go only once around the tensioner. Repeat this step for EVERY
tensioner on the crosshead. For tensioners with six jackbolts, tighten ALL jackbolts in a star
pattern for this and all remaining steps, see View D of
d. At 100% target torque, tighten the same four jackbolts on each tensioner.
e. For a given Superbolt tensioner, tighten all jackbolts in a circular pattern at 100% target torque
(see View C of
). Go only once around the tensioner. Repeat this step for EVERY
tensioner on the crosshead.
f.
Make additional passes in a circular pattern, as necessary, at 100% target torque to stabilize the
jackbolts at the target torque; i.e., there should be less than 10 degrees of rotation when
tightening. Do not over torque the bolts.
Caution
During a test or when the crosshead is NOT being positioned, the crosshead jackbolts must
be torqued properly, refer to
for the appropriate target torque. Do not over torque
the bolts.
7. Adjust the crosshead support collars on the columns so that they are in contact with the bottom of
the crosshead (use hex-bit socket and ratchet wrench). Secure the crosshead support collars to the
