BJM Pumps LWA75H-575T - Manual (Page 16)

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12. Lubricate the lip seal (25) with oil, and press this into the bore on the opposite
side of the lower stationary seal, using the proper pressing tool.
13. Lubricate the shaft with a light coating of Shell FM32 oil. Using a pushing tool,
press the rotating element for the upper seal onto the shaft and down to the point
of contact with the stationary seal. Add the spring. Re-lubricate the shaft with a
light amount of oil and install the lower rotating element onto the shaft using a
pushing tool.
14. With all O-Rings in place, replace the seal housing and retain with the four cap
screws.
15. At this time the seal chamber should be able to be air checked. With the proper
gauge set up, apply 10 PSIG (do not add more that 10 PSIG of air pressure). No
pressure drop should be seen in five minutes under air pressure. The shaft
should be rotated a few times during this testing to insure that the mechanical
seals are operating properly.
16. Fill the seal oil chamber with the proper amount of Shell FM 32 NSF approved
oil. Note that a 10-15% air gap should be maintained in the seal chamber to allow
for heat expansion.
17. The impeller (27) with shims and the shaft key (46) can be placed onto the shaft
and secured with the retaining nut and lock washer.
18. The suction wear plate (28), agitator (39) and suction strainer/stand can be
replaced and tightened down properly.