Goulds Pumps XHD - IOM - Manual (Page 46)

Commissioning, Startup, Operation, and Shutdown
Set impeller to Suction Seal Ring Clearance Dial Indicator Method
WARNING:
Always disconnect and lock out power to the driver before you perform any installation or maintenance
tasks. Failure to disconnect and lock out driver power will result in serious physical injury.
All of the instructions that are stated in the following steps are based on viewing the unit from
the rearward (drive) end.
1. Remove the coupling or v-belt guard.
2. Loosen the two adjusting nuts (415A) on the forward sides of the bearing frame adjustment
plates (234F) by turning them counterclockwise.
3. Loosen but do not remove the adjustment plate hold-down bolts (352G) and nuts (427D)
that clamp the bearing frame adjustment plates (234F) to the pedestal (131). Do not
remove the adjustment plate hardware. Keep hardware finger tight to keep the power frame
constrained to the pedestal.
4. Back up the Impeller: Turn the two adjusting nuts (415A) on the rearward sides of the
bearing frame adjustment plates (234F) counterclockwise sequentially, 1/2 of a turn each at
a time, to draw the power end and impeller (101) backward until the face of the rear pump
out vanes of the impeller contacts the volute liner (561). Turn the shaft (122) clockwise to
ensure that there is contact between the impeller (101) and volute liner (561). Stop turning
the adjusting nuts (415A) when a firm drag is encountered.
5. Place and zero the indicator: Place the dial indicator so that the button contacts either the
shaft end, face of the coupling, face of the sheave bushing, or on the face of the bearing
end cover. Zero the indicator.
6. Loosen the two adjusting nuts (415A) on the rear sides of the bearing frame adjustment
plates (234F) that were tightened in step 4 above by turning them counter clockwise.
7. Move Impeller forward the sum of impeller back clearance plus the impeller front clearance
from table 7: Turn the two adjusting nuts (415A) on the forward sides of the bearing frame
adjustment plates (234F) clockwise sequentially, 1/2 of a turn at a time, to draw the power
end forward until there is a 2.54mm (.100 in) or 3.0 mm (.118 in) gap between the impeller
(101) and suction volute liner (561) as measured on the dial indicator.
44 XHD Installation, Operation, and Maintenance Manual