MP Pumps S300, S600, S700, & FM40 PUMPS INSTRUCTION - Manual (Page 3)

4. After removal from the pump the seal should
be carefully examined. In the majority of cases
the seal must be discarded since the removal in
this way usually damaged the seal faces or the
rubber parts.
I f the sleeve did not come out with the seal head
when it was pushed out with the adaptor, then it
should be removed, examined, and cleaned up. It
is removed as follows:
1. Take out the square key and slide the sleeve off
of the shaft. Remove the shaft slinger.
At assembly the shaft was coated with an anti-seiz-
ing compound to facilitate removal of the sleeve. If
the sleeve does not come off easily it may be nec-
essary to use a sharp chisel at the joint between
the sleeve and shaft to break it loose. When the
sleeve is loose it should slide off the shaft easily.
After the sleeve has been removed, the pump and
the sleeve should be thoroughly cleaned to remove
all foreign matter. Burrs or rough spots should be
smoothed out with a file or crocus cloth. The face
at the impeller end of the sleeve must be carefully
inspected to be sure it is free of any burrs or gouges
because this face is part of the sealing system that
requires this surface be smooth.
Remove the old seal from the seal cover. Clean up
the seal cover and install a new seat. Lubricate
the outside of the seal seat with a water soluble
lubricant and press this into the seal cover taking
care not to damage the smooth lapped sealing face
of the seal seat. Remove any excess lubricant from
the face of the seal seat. Be careful not to scratch
the seal face. Replace the shaft slinger.
Before installing the seal cover lightly coat the pump
shaft with an anti-seize compound. This should be
applied up to within a 1/2” of the shoulder next to
the impeller. This aids the removal of the sleeve
the next time the pump has to be serviced. If the
anti-seize compound is placed all the way to the
shoulder then an excess buildup may occur and
be transferred to the face of the seal seat when
installing the sleeve.
Install the seal adaptor in the body assembly.
CAUTION:
Do not bump the seal seat on the shaft or you
may damage it. Secure the seal cover in place
with the two capscrews that were removed ear-
lier.
Install the seal head on the stainless steel sleeve
as follows:
1. Place the cardboard disc that comes with the
seal on a clean flat surface. Then place the
seal head on it with the face down.
CAUTION:
The mechanical seal and seal cavity must be
clean and free of grit, filings, or any other for-
eign material that would damage the seal face.
2. Wipe a small amount of water-soluble lubri-
cant around the inside of the seal bellows. Take
the stainless steel sleeve and apply a thin
film of lubricant around the entire outside area
of the sleeve.
3. Insert the sleeve into the seal head assembly
taking care to start the sleeve straight in. Once
started slide the seal head about half way
back on the sleeve. Clean off any excess lubri-
cant on the seal face and on the stainless steel
sleeve on the seal face side but not behind it.
Install the sleeve and seal head assembly in the
pump by pushing it over the shaft. Do not get any
lubricant or anti-seizing compound between the
seal faces. Line up the keyways on the shaft and
sleeve.
Install the square key in the keyway and push it
back until it stops.
Make up the front seal washer assembly as fol-
lows:
1. Take a new seelbolt and make sure the O-ring
is in the groove of the bolt head and not crushed
or twisted. Take the stainless steel washer and
put it over the bolt. Then take a new Teflon
washer and put it over the bolt and against the
stainless steel washer. Apply a few drops of
Loctite 271or 601 to the seelbolt and threaded
hole in the pump shaft.
3