Sullair LS-25S-257KW, Operator'S Manual And Parts List

Page: 39 / 83

Section 6
MAINTENANCE
34
Figure 6---7 Compressor Hub Cutaway
Pa rallel Offset --- R e f e r t o F i g u r e 6 --- 8 . L a y a
straight edge squarely across the top of the flanges
of both shaft hubs as shown and also at a point 90
_
away. This value must not exceed the installation
Pa r a l l el O f f s et indic a ted in Tabl e 1 . If a dial indic ator
is used, compensate for sag and attache it on one
shaft and rotate the hub 360
_
while taking readings
on the other hub male register outside diameter.
DO NOT exceed the installation Parallel Offset lim-
its as calculated in Table 1 .
STEP 3 --- INSTALLATION OF CENTER ASSEM-
B L Y --- Chec k the dr iv e bol ts ( s ee Figur e 6 --- 6 ) of
c enter assembl y for pr oper tor que per Ta bl e 1 , be -
fore installation. Place the center assembly into po-
sition between the two (2) hubs. Dip adapter bolts
( s ee Figur e 6 --- 6 ) in S A E 3 0 o il and inser t bol ts with
lockwashers through hub flange holes and engage
tapped holes in each adaptor. Tighten adapter
bol ts to r ec ommended tor que per Tabl e 1 . A f ter
torquing all adapter bolts, recheck the alignment.
STEP 4 --- INSTALLATION OF SHRINK DISC
R e f e r t o F i g u r e s 6 --- 6 a n d 6 --- 7 . S h r i n k d i s c s a r e
supplied ready for installation. Therefore, they
should not be disassembled prior to initial installa-
tion.
INSTALLATION SEQUENCE
1. Remove spacers placed between collars for pro-
tection during transportation.
2. Take any three locking screws forming the points
of an equilateral triangle (e.g. screw 1, 5 and 9 in
Figur e 6 --- 6 ) and tighten them sl ightl y until the
inner ring can still just be turned.
3. Slide shrink disc over the hub. The hub outside
surface can be greased.
WARNING
!
Never tighten locking screws before shaft is inside
the hub.
Figure 6---8 Parallel Offset Alignment
4. Degrease the hub bore and shaft seat.
5. Insert shaft or slide hub over the shaft.
6. Tighten all locking screws gradually and all the
way around (not in diametrically opposite se-
quenc e; s ee Figur e 6 --- 7 ) .