Quincy Compressor 50093-103 - Manual (Page 59)

53
Correcting Angular Misalignment (side view)
1.) With the indicator point on the face of the motor half,
zero the indicator.
2.) Rotate the entire assembly 180° or one-half (1/2) turn.
Note the indicator reading. This reading is referred to
as "C" in the formula and example below.
3.) Measure the distance from center to center between
the motor feet. This will be referred to as "A".
4.) Measure the OD of the coupling. This will be referred
to as "B".
5.) Divide measurement "A" by measurement 'B".
6.) Multiply the result from step 5 by the indicator
reading "C" to determine the amount of shim to be
placed under either the front feet or the rear feet of the
motor to correct the misalignment.
EXAMPLE
A = 5", B = 4", C = +0.028. Because "C" is a positive
reading, the distance between the coupling halves is
greater at the top.
A/B x C = Required shims
5/4 x 0.028 =0.035 shims needed
In this case, shims should go under the rear motor feet.
The formula eliminates a lot of trial and error when
determining number of shims to use.
Parallel Misalignment Viewed from the Side
1.) Mount the dial indicator on the vacuum pump
coupling half so that it will read from the outside
surface of the motor coupling half.
2.) Position the indicator at the top of the coupling.
3.) Rotate the coupling halves together, 180° in the
direction of vacuum pump rotation. The indicator
reading is twice the amount of shim which must be
added or subtracted from the motor mounts to
achieve proper alignment. Loosen the motor mounting
bolts and shim all feet an amount equal to half the
indicator reading.
Angular Misalignment Viewed From the Top
1.) Mount the dial indicator on the compressor coupling
half so that it reads from the face of the motor
coupling half.
2.) Position the indicator on side of the coupling.
3.) Rotate the coupling halves together, 180° in the
direction of the vacuum pump rotation. The indicator
reading in this position is the amount of angular
misalignment.
4.) Loosen the motor mounting bolts and move the motor
slightly with a pry bar or soft hammer so that when
step 3 is performed, the indicator reading is within
machine specifications.
NOTE: Always recheck all measurements since one
alignment procedure may effect another.
Reinstall the other element half and torque all
mounting bolts. Before placing the unit in operation,
replace the drive guard and clear the area of all tools.
! CAUTION !
Do not operate the unit without both the coupling
halves and guards in place.
NOTE: Do not lubricate capscrew threads. If capscrews
are reused, apply thread-locking adhesive. These are
special bolts, do not substitute!
Water-cooled Heat Exchangers
Most fluid/water heat exchanger problems are due to
underestimating the importance of water treatment and
heat exchanger maintenance. Efficient, long service life can
be obtained only when clean, soft and/or treated water is
used and the exchanger tubes are cleaned on a regular
basis. HEAT EXCHANGER GUARANTEES DO NOT
COVER FAILURES CAUSED BY CORROSION OR
PLUGGING.