Pulsafeeder Pulsalube 8 GS Ultra, Operation & Maintenance Manual

Page: 147 / 198

5. Installation
WARNING
Disconnect all power sources from the equipment before
beginning this installation procedure. Handle the com-
ponents with care and avoid all sharp machined edges to
prevent personal injury.
STOP
HARMFUL SITUATION
STOP
Do not tighten any of the shrink disc locking screws prior
to installing the reducer with shrink disc onto the machine
shaft. The inner ring of the shrink disc can become perma-
nently contracted or damaged at relatively low tightening
torque.
A. Inspect the gear unit received. Make sure the shrink disc
and extended hollow shaft projection is on the side of the
reducer where it was specifi ed or ordered.
B. Loosen the shrink disc locking screws but do not take the
shrink disc completely apart. Remove and discard any
packaging material or transportation spacers that come
with the shrink disc.
C. Remove all burrs, rust, corrosion, lubricants, and foreign
matter from the surfaces of the solid shaft and hollow-bore.
D. Make sure the shrink disk is positioned onto the hollow
shaft until the outer clamping ring is fl ush with the edge
of the hollow shaft.
E. To aid in assembly, it is acceptable to lightly grease the
solid shaft, only in the area that will come in contact with
the bronze-bushing side of the reducer hollow-shaft. The
reducer hollow shaft must be completely de-greased and
free of lubricant, especially in the area of the shrink disc.
F. Position the gear reducer onto the solid machine shaft
and make certain the area under the shrink disc is
completely supported by the solid shaft.
G. After confi rming the proper positioning of gear reducer
and the shrink disc, hand tighten (3) or (4) equally spaced
locking screws to make sure the outer collars of the shrink
disc are drawn together in a parallel fashion. Then hand-
tighten the remaining screws.
H. Refer to Table 2 for the specifi ed tightening torques for
the shrink disc locking screws. Using a properly set torque
wrench using approximately ¼ (90°) turns; tighten the
locking screws, by working in a circular clockwise or
counterclockwise sequence around the shrink disc.
I. Continue the tightening sequence (Step H.) even if some
locking screws initially require very low tightening torque
to achieve ¼ turns; do this for several passes until ¼ turns
can no longer be achieved.
J. Reset the torque wrench to approximately 3-5% over-
torque and tighten the locking screws for 1 or 2 more
passes. This procedure will compensate for relaxation of
the locking screws, since tightening of a given screw will
always tend to relax the adjacent screw. Without a slight
overtorquing of the screws, an infi nite number of passes
would be required to reach the desired tightening torque.
Table 2 - Shrink Disc Locking Screw Torque
Screw Size Wrench Size Tightening Torque
[mm] [Nm] [lb-in] [lb-ft]
M5 8 7 62 5.2
M6 10 12 106 8.9
M8 13 30 266 22
M10 17 59 522 44
M12 19 100 885 74
M16 24 250 2213 184
M20 30 490 4337 361
M24 36 840 7435 620
M30 46 1700 15050 1254
BOLT TIGHTENING PATTERN
K. Reset the torque wrench to the correct tightening torque
as indicated in Table 2. Make sure each locking screw has
been properly tightened until the screws are no longer
turning at the specifi ed torque wrench setting. If necessary
repeat Steps G. & H.
6. Removal
A. Loosen the shrink disc locking screws in a circular pattern
by using ½ (180°) turns, until the shrink disc hub can be
moved or until the shrink disc hub and reducer shaft will
return to their original fi ts.
WARNING
Do not completely remove the locking screws before the
outer clamping disks of the shrink disc are disengaged
from the inner ring. A sudden release of the outer collars
will create high separating forces and could result in injury
or even death.
B. Loosen the outer collars of the shrink disc from the tapered
inner ring. This may require tapping the bolts with a soft
faced hammer or prying lightly between the outer collars.
C. Remove the gear reducer from the machine shaft.
7. Re-installation
A. It may be possible to re-use the shrink disc. However the
shrink disk should not be re-used if it becomes damaged
during removal, or excessively rusty or corroded. Shrink
discs must always be disassembled and thoroughly cleaned
before re-using.
B. After cleaning the shrink disc, lubricate between the
taper of the outer clamping disks and the outside of the
inner ring using MOLYKOTE® G-Rapid Plus Paste
(product of Dow Corning) or equivalent. In addition,
grease screw threads and head contact area with multi-
purpose grease.
DRIVESYSTEMS
HOLLOW SHAFT WITH
SHRINK DISC
RETAIN FOR FUTURE USE U10290 - 2 of 2
www.nord.com/docs 02.11.13
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