Spencer Vacuum Cleaning Systems - Manual (Page 4)

4
II. Coupling Alignment
For Power Mizer ® Cast Centrifugal Vacuum Producers refer to
Form WW.
Caution: The coupling on this machine was carefully
aligned at the factory and the coupling halves and shell(s)
marked to indicate optimum relative position. However,
transportation may have caused coupling misalignment. It
is essential, therefore, that the motor and Vacuum Producer
shafts be checked for misalignment and carefully realigned
if necessary after installation and before start-up, as mis-
alignment can cause destructive vibration.
Coupling alignment should be rechecked again after an
hour’s operation. Final alignment should be made at aver-
age operating temperature. After each alignment check,
add lubricant per instructions and replace coupling guard.
On certain Vacuum Producers, the coupling is disassembled
after factory alignment and marking. The coupling halves are
specially protected against the elements and the machine is
shipped. Prior to start-up, it is necessary on these machines to
assemble, align key ways using factory markings, and lubricate
in accordance with the instructions supplied with the machine
and contained here.
Coupling alignment provides for aligning, in the horizontal and
vertical planes, the motor shaft with the blower shaft, and insur-
ing adequate clearance (gap) between the two coupling halves.
Only qualified maintenance personnel should attempt to align a
coupling. If doubt exists as to competency or if problems arise
contact The Spencer Turbine Company.
Sier Bath Coupling (See accompanying illustrations)
Sier Bath gear type couplings are the most common coupling
supplied with Spencer equipment. These are manufactured to
our rigid specifications.
Remove one snap ring and slide the sleeve off the hub halves.
Using a feeler gauge, verify that the gap between coupling
halves, is in accordance with the chart above.
Caution: Be careful because some motor shafts are spring
loaded axially. When using a feeler gauge take care not to
compress the shaft and disturb the normal at-rest position.
To align this coupling, Spencer recommends one of the following
procedures.
Reverse Indicator Method (Preferred)
1. Reinstall the coupling sleeve, seal and snap ring.
2. Clamp dial indicators on shafts, 180 degrees apart.
3. Place indicator probes on opposite shafts as shown.
4. Rotate both shafts simultaneously in the correct operating
direction, taking readings at 90 degree intervals.
5. Adjust motor to achieve parallel and angular alignments.
If questions arise, contact the Spencer Service Dept.
Straight Edge Method (Permissible)
1. Remove the old lubricant and clean the hub teeth.
2. Set a machine shop quality straight edge across the coupling
hubs (at the root diameter of the gear teeth).
3. Adjust the motor so the straight edge is evenly supported
between the coupling hubs at the 3, 6, 9, and 12 o’clock
positions.
4. Using a feeler gauge, measure the clearance between the
coupling hubs at the 3, 6, 9, and 12 o’clock positions.
5. Adjust the motor so that the gap is identical at the 3, 6, 9,
and 12 o'clock positions and in accordance with the
dimension “C”.
Caution: Be sure to relubricate coupling after alignment
and before operation.
Coupling Alignment with Sleeve Bearing Motors
Caution: Where sleeve bearing motors are used, it is
necessary to complete the following procedures before
coupling alignment is attempted.
Unless otherwise specified by the customer, a flange type gear
coupling should be used for both 1800 and 3600 RPM applica-
tions. Do not use a sleeve type coupling.
Sleeve bearing motors have a specified end play. End play
limits and the magnetic center (where motor will run) should be
scribed on the shaft by the manufacturer.
Sier Bath Dimension “C” (hub to hub)
Coupling Size Gap
7/8 1/8
1 1/2 1/8
2 1/8
2 1/2 1/4
3 1/4
3 1/2 1/4
4 1/4
4 1/2 1/4
5 1/4
6 1/4
7 3/8
9 1/2
11 1/2
12 1/2
Blower Shaft Motor Shaft
Blower Shaft Motor Shaft
Straightedge
Straightedge Feeler Gauge
Motor
Shaft