5.) Attach a dial indicator to the mount with the
necessary hardware to allow the indicator plunger to
contact the motor hub.
NOTE: Four viewpoints need to be checked. Angular
and Parallel as viewed from the top. Amgular and
Parallel as viewed from the side.
Correcting Arwular 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 above.
3.) Measure the distance from center to center between
the motor feet. This will be referred to as “A”.
4.) Measure the O.D. 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
(refer tofigure Page 48)
A = 5“, B = 4“, C = + .028. Because “C” is a positive
reading, the distance between the coupling halves is
greater at the top.
A/B * C = Required shims. 514 * .028 = .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 Misali$mment 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 TOD
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
The majority of fluid/water heat exchanger problems
are due to underestimating the importance of water
treatment and heat exchanger maintenance. Eflicient,
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.
In many instances, the cooling water supply for the heat
exchanger will contain impurities dissolved in solution
and/or in suspension. These substances can cause scale
Page 53
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