TM 10-4320-307-24
3-7 FLEXIBLE COUPLING INSPECT/ALIGN/REPAIR/REPLACE (CONT).
ALIGNMENT:
NOTE
Individual maximum alignment tolerances
allowed are:
Axial - 2.5 mm (about 0.10 inch)
Radial - 1.2 mm (about 0.05 inch)
Angular - 0.5 degrees (10 min.)
Angular tolerance is difficult to measure
accurately.
The
average
long
term
tolerance deviations to provide extended
coupling life are approximately 10 percent
of the maximum individual allowances listed
above. All three tolerances listed are
interrelated
upon
adjustment.
An
acceptable conservative relationship that
can be field applied is shown by the
coordinate graph.
NOTE
Each mainline pumping assembly is factory
aligned and shipped with the flexible
coupling removed to prevent potential
shipping damage. Normal factory alignment
is performed to very stringent requirements
in order to provide the assurance that field
realignment requirements are minimized
after installation and prior to operation.
1.
Insure pumping assembly is installed/located on a
flat prepared surface (concrete, wooden plat- form, or
gravel bed) and is within 5 degrees of level in any
direction. Refer to TM 10-4320-307-10.
2.
Check to verify proper alignment between pump
and speed increaser gear half couplings as follows:
a.
Check distance between pump side hub
(1) and speed increaser side hub (2) with an in- side
micrometer (3) at the 4 points shown on vertical and
horizontal axes.
NOTE
The readings should be taken near the
outer coupling ring, all on approxi-
mately the same radius from shaft
center.
3-13
