Vilter VSM 71-701 Operation And Service Manual Download

Page: 32 / 244

Installation

Parallel Offse

t. Rigidly mount a dial indi-

cator on one hubor shaft, reading the other hub
flange outside diameter, as shown in Figure 3.
Indicator set-up sag must be compensated for.
Rotate both shafts together. Adjust the equip-
ment by shimming and/or moving so that the
indicator reading is within .002 inch per inch
of the axial length between flex elements. See

drawing below.

Note: If the driver or driven equipment alignment
specification is tighter than these recommenda-
tions, the specification should be used. Also, be
sure to compensate for thermal movement in the
equipment. The coupling is capable of approxi-
mately four time the above shaft alignment toler-
ances. However, close alignment at installation
will provide longer service with smoother opera-
tion.

E. Final assembly .

With the coupling in good alignment the bolts
will fit through the holes in the flanges and the
disc packs more easily.

a. If the coupling arrived assembled, the disc
packs are still attached to the center ring. Be-
fore taking the discs packs off, first install one
hub bolt through each disc pack and secure
with lock out. This will help when the pack is
reinstalled late. If the coupling was shipped
disassembled, the bolt through the pack is not
required as the discs in the pack are factory
taped together.

b. Remove the long bolts. Mount the disc packs
on the hubs with one bolt through the disc pack
aligned with a clearance hole in the hub. In-
stall the short bolts through the hub, disc pack,
bevel washer or link, and secure with a lock-
out.

NOTE: All bolt threads should be lubricated. A
clean motor oil is recommended. On size 226 and
larger, a link must be put on bolt first. Remove
the disc pack alignment bolt. Proceed to mount
the second disc pack to the other hub in the same
way.

C.Position one set of short bolts in each hub
on top. Now slide the center ring down into
place straddling the short bolts with the cen-
ter ring bushings. If coupling is dynam-ically
balanced, the center ring match marks must
lineup with both hub match marks. When one
bushing is in-line with the hole in the disc pack,
slide one long bolt through washer or link, disc
pack, center ring, disc pack, washer or link,
and then secure with a locknut. The long bolt
requires a minimum clearance “R” for instal-
lation between back side of coupling flange
and stationary equipment. See Figure 1 and
Table l for value of “R.” On size 226 and larger
a link must be put on the bolt first. Now in-
stall the rest of the long bolts in the same man-
ner.

D.Torque the long bolt locknuts at this time.

See Table on page 31 for torque values.

NOTE: With the coupling in good alignment, the
bolts will fit through the holes in the flanges and
the disc pack more easily. It is recommended that
all locknuts be retightened after several hours of

Note: Alignment of C-
Flange Units should be
checked when compressor
or motor are replaced.