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Figure 1. Firefighting Pump Alignment
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TM-55-1925-292-14-P Firefighting Fire Alarm and Fire Suppression Systems Inland and Coastal Large TUG (LT) Manual
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Figure 3. Dial Indicator/Parallel Alignment Depiction
TM 55-1925-292-14&P
0034 00
3
1
5
4
6
2
Angular
Correct
Misalignment
Alignment
Figure 2. Dial Indicator/Angular Alignment Depiction
NOTE
The dial indicator should have a 0.200 in (5.08 mm) to 0.300 in (7.62 mm) preload when
installed against the PTO output flange.
8. Position the dial indicator (figure 2, item 3) against the PTO output flange (figure 2, item 4) as shown in
figure 2.
9. Place a 0.200 in (5.08 mm) to 0.300 in (7.62 mm) preload on the dial indicator.
10. Zero the dial indicator (figure 2, item 3) by twisting the indicator's bezel (figure 2, item 5).
NOTE
Observe the dial indicator's needle movement to either side of zero as the pump shaft is
rotated. Add the readings on both sides of zero to determine the amount of angular
misalignment. For example, if the dial indicator needle moves 0.002 in (0.05 mm) to
one side of zero and 0.004 in (0.10 mm) to the other side of zero, add the two readings
(0.002 in (0.05 mm) + 0.004 in (0.10 mm) = 0.006 in (0.15 mm)) to determine that the
angular misalignment is 0.006 in (0.15 mm).
11. Slowly rotate the pump shaft (figure 2, item 6) while noting the dial indicator (figure 2, item 3) reading.
12. Maximum allowable angular misalignment is 0.150 in (3.80 mm). If the angular misalignment exceeds this
specification, the misalignment must be corrected. Angular misalignment is corrected by loosening the
pump mounting bolts (figure 1, item 6) and rotating the pump on its mounting. After adjusting the alignment,
tighten the pump mounting bolts and perform steps 7-12 until the misalignment is within the maximum allow-
able misalignment specifications.
0034 00-3

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