Slewing Drive Mounting Bolts Retighten To The Prescribed Torque - Check - Vanguard CPW 125-4-S Series Operation And Maintenance Manual

Slewing drive mounting bolts retighten to the prescribed torque - Check

To compensate for possible settling, it is necessary to retighten the bolts to the prescribed torque .This shall be done without
an external load applied to the bolt connection. This inspection shall be repeated annually, or 100 hours after installation.
Inspection: The following procedure is to be used only as an indication that minimum assembly requirements have been
achieved or maintained:
1. Start with either inner or outer ring. Start at one bolt and work around the bolt circle to check all bolts. Repeat for
the other ring.
2. Apply the static inspection torque in the tightening direction
3. The fastener shall not move when the static inspection torque is applied.
4. In case of loose bolts, replace all bolts and washers with new ones.
Installation: The following procedure is to be used only for reinstallation of the slewing drive mounting bolts.
1. When replacing or reassembling bolts, apply removable strength Thread Lock, Loctite Blue 242, or equivalent to
the bolt threads.
2. Preload the bolts crosswise. See the general pattern in the sketch in Figure 16 below to reinstall bolts (1) and (2),
tighten in a crosswise pattern sequence.
3. Start with either the inner or the outer ring. Do the crosswise tightening of all bolts to 30% of installation torque.
Then repeat crosswise torque to 80% of installation torque. Finally crosswise torque to 100% of the installation
torque as noted. Repeat for the other ring.
4. Once the bolt is tightened, permanently mark the position of the bolt head to that of the stationary structure. This
will be used later during inspection to be sure the bolt head has not unwound.
Lower Bolts
(2)
Lower Bolts
(2)
037-D6N-05-003A
BOLT TORQUES
Static Inspection torque: Upper bolts (1), lower bolts (2) = 175 Nm (130 LB-FT)
Installation torque: Upper bolts (1), lower bolts (2): 30% = 64 Nm (48 LB-FT),
80% = 172 Nm (128 LB-FT), 100 % = 215 Nm (160 LB-FT)
Figure 16: Slewing drive mounting bolts torque
037-08OP-003B
037-T8-20-006B
S/N 037201400021 – UP (T8 Slewing Canopy)
S/N 037200370021 – UP (D6N LGP Slewing Canopy)
037-T8-20-005A
To reinstall bolts (1) and
(2), tighten in a
crosswise pattern.
Upper Bolts
(1)
Lower Bolts
(2)
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