The standard impeller has an impeller nut and drive key. Unscrew the impeller nut (right hand pump
will have a right hand impeller nut) and then carefully pull the impeller off the end of the shaft.
4.
Remove the cap screws which fasten the stuffing box cover (184) to the bearing housing (134A).
Carefully slide the cover from the end of the shaft (122).
CAUTION:
Some HS pumps utilize the same cap screws to secure the casing and SB cover. In this case,
clamp the SB cover in a position while removing the casing. Then the SB cover may be careful-
ly slid from the shaft.
5.
The sleeve (126) may be pulled from the shaft (122). If the stuffing box is packed, remove gland
(107), seal cage (105) and packing (106).
4.4 Assemble the Liquid End
1.
The shaft sleeve (126) must be clean and free of burrs. Slide the sleeve onto the shaft until it butts
against the shaft shoulder.
2.
Slide the SB Cover (184) into position over the shaft sleeve against the bearing housing. Secure in
place with cap screws.
3.
Install the impeller - Standard key drive: Make sure O-ring (412F) is in place on the impeller hub
and the key (178) is in place on the shaft. Push the impeller into position and tighten on the impeller
nut without the second O-ring (412F). Remove the impeller nut, install the second O-ring and re-
tighten the impeller nut.
4.
Install gasket (351) on the casing and carefully lift the casing into position against the SB Cover.
Secure with cap screws.
5.
Install the necessary packing, lantern ring and gland in the stuffing box, but do not tighten the gland
more than slightly snug until the pump has been run.
4.5 Special Notice
To ensure against possible long and costly downtime periods, especially on critical services, it is advisa-
ble to have spare parts on hand.
Repair orders will be handled with a minimum of delay if the following directions are followed:
1.
Give model number, size of pump, and serial number. These can be obtained from the nameplate
on the pump.
2.
Write plainly the name and part number of each part required. These names and numbers should
agree with those on the bill material.
3.
Give the number of parts required.
4.
Give complete shipping information.
4.4 Assemble the Liquid End
Model HS Installation, Operation, and Maintenance Manual
21
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