Xylem 9100 Series Base Mounted Centrifugal Fire Pumps AC8585 REV.C - Manual (Page 11)

Method 1 – Straight Edge Alignment for
Standard Sleeve Type Coupler with Black
Rubber Insert
11
(See Figure 6A)
Proceed with this method only if satisfied that
face and outside diameters of the coupling
halves are square and concentric with the
coupling borers. If this condition does not
exist or elastomeric couplings do not make
this method convenient, use Method 2.
1. Check angular misalignment using a
micrometer or caliper. Measure from the
outside of one flange to the outside of the
opposite flange at four points 90° apart.
DO NOT ROTATE COUPLER.
Misalignment up to 1/64" per inch of
coupler radius is permissible.
2. At four points 90° apart (DO NOT
ROTATE COUPLER), measure the
parallel coupler misalignment by laying a
straight edge across one coupler half and
measuring the gap between the straight
edge and opposite coupler half. Up to a
1/64" gap is permissible.
FIGURE 6A – CHECKING ALIGNMENT
(Method 1)
DIAL
INDICATOR
PARALLEL
ALIGNMENT
INDEX LINE
RESILIENT
SEPARATOR
ANGULAR
ALIGNMENT
DIAL
INDICATOR
FIGURE 6B - CHECKING ALIGNMENT
(Method 2)
Method 2 – For Orange Hytrel Insert, 3500
RPM Operation, or All Other Coupler
Types Except as Noted Below
(See Figure 6B)
a. Make sure each hub is secured to its
respective shaft and that all connecting
and/or spacing elements are removed at
this time.
b. The gap between the coupling hubs is set
by the manufacturer before the units are
shipped. However, this dimension should
be checked. (Refer to the coupling
manufacturer’s specifications supplied
with the unit.)
STRAIGHT EDGE
c. Scribe index lines on coupling halves as
shown in Figure 6B.
FEELER GAGE
ANGULAR ALIGNMENT PARALLEL ALIGNMENT
INCORRECT ALIGNMENT
d. Mount dial indicator on one hub as shown
for parallel alignment. Set dial to zero.
STRAIGHT EDGE
e. Turn both coupling halves so that index
lines remain matched. Observe dial
reading to see whether driver needs
adjustment (See paragraph i below).
FEELER GAGE
f. Mount dial indicator on one hub as shown
for angular alignment. Set dial to zero.
CORRECT ALIGNMENT
g. Turn both coupling halves so that index
lines remain matched. Observe dial
reading to see whether driver needs
adjustment (See paragraph i below).
h. Assemble coupling. Tighten all bolts and
set screw(s). It may be necessary to
repeat steps c through f for a final check.
i. For single element couplings, a
satisfactory parallel misalignment is
.004"T.I.R., while a satisfactory angular