Section 7
MAINTENANCE
48
an excess acetylene mixture. Mark hubs near the
center of their length in several places on hub body
with a temperature sensitive crayon, 275ºF (135ºC)
melt temperature. Direct flame towards hub bore
using constant motion to avoid overheating an area.
If an oil bath is used, the oil must have a flash
point of 350ºF (177ºC) or higher. Do not rest hubs
on the bottom of the container. Do not use an open
flame in a combustible atmosphere or near com-
bustible materials.
Heat hubs as instructed above. Mount hubs as
quickly as possible with hub flange face flush with
shaft end. Allow hubs to cool before proceeding.
Insert set screws (if required) and tighten.
COMPRESSOR HUB INSTALLATION
Refer to shrink disc installation sequence before
mounting special compressor hub assembly. Slide
compressor hub and shrink disc assembly onto
compressor hub. Shaft should be recessed 3/8”
from face of hub. Gradually tighten all shrink disc
locking screws to 42 ft. lbs. torque per step no. 6,
(under INSTALLATION SEQUENCE), and Figure 7-
12.
STEP 2 OFFSET ALIGNMENT - Position equip-
ment for coupling gap approximately 7” (178mm).
Align the shafts so that a straight edge will rest
squarely (or within the offset limits specified in Table
7-1 Installation Data) on both flanges and at a point
90º away. Vertical offset alignment is adjusted by
the addition or removal of motor mounting shims.
Loosen motor mounting bolts and slide the motor
sideways to correct the horizontal offset.
STEP 3 COUPLING GAP AND ANGULAR ALIGN-
MENT - Align shafts within the angular limits and to
the coupling gap specified in Table 7-1 Installation
Data. To determine angular misalignment in inches,
measure the maximum space between flanges and
the minimum space 180º away, then subtract. To
adjust the motor mounting bolts and adjust the
motor position until the angular alignment is within
tolerance.
DO NOT upset the offset alignment or hub gap
when adjusting motor position.
Figure 7-7 Parallel/ Angular Offset Alignment
Figure 7-6 Drive Coupling Alignment
Table 7-1 Installation Data
Max. Operating Misalignment
Adapter Bolt Coupling Drive Bolt Drive Bolt
Tightening Coupling Parallel Capscrew Tightening Elongation
Torque, Oiled Gap Offset Angular Torque, Oiled Inches
ft.-lbs./ Nm +
.030 inches Inches Deg. Inches(I) ft.-lbs./ Nm
28/ 38 7.00 T.I.R. .005 .5 .005 169/ 229 .0050-.0060
(I)Angular misalignment in inches equals maximum A minus minimum B as shown in Figure 7-6. Do not exceed
values in Table above.
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