Goulds Pumps XHD - IOM - Manual (Page 47)

Commissioning, Startup, Operation, and Shutdown
8. Tighten the adjustment plate hold-down bolts (352G) and nuts (427D) that clamp the
bearing frame adjustment plates (234F) to the pedestal (131). Make sure that the dial
indicator reading remains at the proper setting.
9. Loosen the three seal ring jam nuts (357B) by turning them counterclockwise.
10. Move Seal Ring to contact to the impeller: Turn the three square head adjusting bolts
(356F) sequentially counter clockwise, 1/3 of a turn each at a time, until the seal ring (822)
contacts the impeller (101) and is square with the wear surface of the impeller. Turn the
shaft (122) clockwise while performing step 10 to ensure there is contact between the seal
ring (822) and impeller (101). Stop turning the square head adjusting bolts (356F) when a
firm drag is encountered.
11. Tighten the seal ring adjusting bolt jam nuts (357B) by turning counterclockwise until the
nuts contact the suction casing (100A).
12. Loosen the adjustment plate hold down bolts (352G) and nuts (427D).
13. Loosen the two adjusting nuts (415A) on the forward sides of the bearing frame
adjustment plates (234F) by turning them counterclockwise.
14. Back up the impeller .51mm (.020 in): Turn the two adjusting nuts (415A) on the rearward
sides of the bearing frame adjustment plates (234F) sequentially clockwise, 1/2 of a turn
each at a time, to draw the power end backward until the impeller (101) dial indicator
measures the proper field setting impeller back clearance from table 7. To verify the correct
impeller to suction seal ring clearance has been made, a feeler gage can be inserted thru
the casing suction between the impeller (101) and seal ring (822) in 3 places to assure the
seal ring is square to the impeller face.
15. Tighten the adjustment plate hold-down bolts (352G) and nuts (427D) that clamp the
bearing frame adjustment plates (234F) to the pedestal (131). Make sure that the dial
indicator reading remains at the proper setting.
16. Tighten the two adjusting nuts (415A) on the forward side of the bearing frame adjustment
plates (234F) by turning counterclockwise until they contact the adjustment plates. This
procedure should yield .51mm (.02in) gap between the impeller (101) and suction seal ring
(822), and leave the approximate back clearance noted in table 7 gap between the rear
shroud of the impeller (101) and the volute liner (561).
XHD Installation, Operation, and Maintenance Manual 45