S&C Mark VI Instructions For Installation Manual page 18

INSTALLATION
Before installing the interphase shaft sec-
tions, attach all flexible coupling assemblies to
the disconnect drive shafts and the output end
of the gearbox (if necessary) where indicated
on the reference drawing.
Note that the rigid couplings to and from the
gearbox are factory-installed to the gearbox.
For some phase spacings, a short flanged sec-
tion of interphase shaft is provided to make
the connections between the gearbox and the
surrounding pole-units. Refer to the reference
drawing for specific details on the interphase
shaft arrangement. See Figure 19, shown on
page 17, for a typical drive train arrangement.
Step 21
Install the user-furnished gearbox support
onto the user-furnished structure. If a detailed
drawing of the user-furnished mounting
structure was supplied when the switch was
ordered, details of the gearbox support will be
found on the associated erection drawing.
The gearbox support must hold the gearbox
in a position such that the rigid couplings on
either side of the gearbox will be level with
the couplings on the pole-unit drive shafts. Use
shims as required.
The gearbox must also be positioned such
that the vertical operating shaft from the opera-
tor makes the correct angle to the gearbox as
shown on the reference drawing. (Flexible or
universal couplings may be used at the input
end of the gearbox. Check the reference draw-
ing for details.)
Step 22
Wrap appropriate lifting slings around the rigid
couplings and the main body of the gearbox,
and lift it into place on the gearbox support. See
Figure 20. When properly installed, the arrow on
the gearbox should face the direction indicated
on the reference drawing.
Step 23
Using the ¹⁄₂–13 tapped mounting holes on the
side of the gearbox, attach the gearbox to the
structure or user-furnished gearbox support.
712-502
Rigid coupling (one shown,
opposite side not visible)
Gearbox support
Figure 20. Install the gearbox.
18
Gearbox
Mounting holes
Flexible or
universal
coupling
(input)