Prepared by: AAN
Rev.: C
Approved by: TED
15-
1
Date: 11/6/09
Revised by: TED (24June2019)
1201040
DARLEY
INSTALLATION OF MECHANICAL FACE SEAL WITH O’RING
SPECIAL HANDLING
Study the engineering layout before installing the seal. This shaft seal is a precision product and should be handled
and treated with care. Take special care to prevent scratches on the lapped faces of the primary and mating ring.
Provide a very clean work area where the assembly will take place. Clean hands prior to assembly.
INSTRUCTION STEPS:
Instructions for Installing a Mechanical Shaft Seal
1.
Inspect mating ring pocket in seal housing ensuring it is clean, free of chips, and nick free, to provide a proper
sealing surface. Isopropyl alcohol may be used to clean the surfaces if required.
2.
Inspect the pump shaft surface under the bellows, ensuring it is clean and nick free to provide a proper sealing
surface. Isopropyl alcohol may be used to clean surface if required.
3.
Lightly lubricate the entire o-ring on the mating ring with a single drop of P-80 water soluble rubber lubricant -
evenly distributed (do not over lubricate) and push it into the cavity using the recommended installation tool or
other suitable plastic tube free of contaminants, firmly seating the mating ring square. Be careful not to get the
P80 on either face. If P-80 is on either face, remove it from the faces prior to installation.
Note: The polished face of the mating ring must face out – away from the pump’s gear case. Try to not touch
the polished sealing face with your fingers; the oils from your fingerprint can cause the seal to leak. Remove
any P-80 from the sealing face after installation.
The approximate
size of a drop
should be between
the sizes of these
two circles.
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