b) Tighten the jack bolts (371A).
Make sure to keep the indicator reading at the proper setting.
10. Make sure the shaft turns freely.
11. Replace the coupling guard.
12. Check both the thrust (332A) and the radial (333A) labyrinth seals to make sure they are seated
properly in the housing.
13. Wear insulated gloves to handle the coupling hub. The coupling hub will get hot and can cause
physical injury.
5.5.2 Set the impeller clearance - feeler gauge method
WARNING:
Failure to disconnect and lock out driver power may result in serious physical injury or death.
Always disconnect and lock out power to the driver before performing any installation or main-
tenance tasks.
•
Electrical connections must be made by certified electricians in compliance with all inter-
national, national, state, and local rules.
•
Refer to driver/coupling/gear manufacturer's installation and operation manuals (IOM) for
specific instructions and recommendations.
1.
Lock out the driver power and remove the coupling guard.
2.
Loosen the jam nuts (423B) on the jack bolts (371A), and then back the bolts out about two turns.
1
Figure 25: Loosen jam nuts
3.
Evenly tighten the locking bolts (370C), bringing the bearing housing (134A) towards the frame
(228) until the impeller contacts the casing.
4.
Turn the shaft to ensure that there is contact between the impeller and the sideplate or wear ring.
5.
With a set of feeler gauges, measure and record the gap between the bearing housing and the
frame.
6.
Turn back the locking bolt (370C) one turn.
5.5 Impeller-clearance setting
Models 3180, 3181, 3185, and 3186 Installation, Operation, and Maintenance Manual
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