6.2 Impeller clearance adjustment
WARNING:
Lock out driver power to prevent accidental start-up and physical injury.
WARNING:
Before installation or disassembly of the coupling guard is performed, the driver must be de-
energized, the driver controller/starter put in a locked out position and a caution tag placed at
the controller/starter indicating the disconnect. Replace coupling guard before resuming normal
operation of the pump or serious physical injury may occur. Goulds Pumps, Inc. assumes no
liability for avoiding the practice.
CAUTION:
The impeller clearance setting procedure must be followed. Improperly setting the clearance
can result in equipment damage and heat generation casing failure.
If a gradual loss of head and/or capacity occurs, performance can be restored by adjusting the impeller.
If performance cannot be restored by adjusting the impeller, the pump should be disassembled and the
impeller, suction sideplate, and casing inspected for wear.
The proper impeller clearance setting provides for equal clearance on both the front side (impeller to suc-
tion sideplate) and the back side (repeller to stuffing box cover). Prior to setting the impeller clearance, it
is first necessary to measure the total impeller travel (normally in the range of 0.090" to 0.140"). Half of
the total travel value then becomes the proper clearance to set the impeller off the suction sideplate.
NOTICE:
If pump is equipped with a cartridge mechanical seal, the centering tabs must be in place and
tightened, and the set screw collar loosened. Failure to take these steps prior to adjusting the
impeller clearance can damage the mechanical seal.
To adjust clearance, proceed as follows (Fig. 20):
Figure 22: Impeller clearance adjustment
1.
Shut down pump.
2.
Lock out power to driver.
3.
Remove coupling guard and coupling spacer.
4.
Loosen adjustment bolts and nuts (D).
6.2 Impeller clearance adjustment
3500XD Installation, Operation and Maintenance Instructions
35
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