Goulds Pumps XHD - IOM - Manual (Page 48)

Commissioning, Startup, Operation, and Shutdown
Table 6: Impeller clearance
Pump Size Field Setting Impeller Back Field Setting Impeller Front
Clearance inches (mm) Clearance inches (mm)
XHD80 0.08 (2) 0.02 (.51)
XHD125 0.08 (2) 0.02 (.51)
XHD150 0.08 (2) 0.02 (.51)
XHD200 0.1 (2.5) 0.02 (.51)
XHD250 0.1 (2.5) 0.02 (.51)
XHD300 0.1 (2.5) 0.02 (.51)
Table 7: Field setting impeller back clearance with an expeller
Pumps that have the dynamic seal option require different impeller running clearances to maximize
expeller performance. Refer to the table below for running clearances for pumps with expeller.
Pump Size Field Setting Impeller Back Field Setting Impeller Seal Ring
Clearance inches (mm) Clearance inches (mm)
XHD80 0.04 (1.02) 0.02 (.51)
XHD125 0.06 (1.52) 0.02 (.51)
XHD150 0.06 (1.52) 0.02 (.51)
XHD200 0.06 (1.52) 0.02 (.51)
XHD250 0.08 (2.03) 0.02 (.51)
XHD300 0.08 (2.03) 0.02 (.51)
Set impeller clearance dial indicator method - XHD
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 clockwise.
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. Turn the two adjusting nuts (415A) on the forward sides of the bearing frame adjustment
plates (234F) sequentially clockwise, 1/2 of a turn each at a time, to draw the power end
forward until the impeller (101) contacts the Suction Liner (562).
5. Turn the shaft (122) clockwise while performing step 4 above to ensure that there is contact
between the impeller (101) and Suction Liner (562). Stop turning the forward adjusting nuts
when a firm drag is encountered.
46 XHD Installation, Operation, and Maintenance Manual