Model mpb, mpv – Xylem MPV User Manual

Page 91

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Installation, Operating and Maintenance Instruction

Model MPB, MPV

MPB 100-english

page 87

Revision 02

Article No 771074115

Issue 01/2010

8.7.3 Model with Standard Rotating Mechanical
Seal (Code "SA, SB, SC, SD, SE and SF") – MPB
Design
For the associated sectional drawing, see the
appendix.

Disassembly

Remove the motor as described in Section 8.5.1

"Replacing the Rolling Bearing – MPB Design"
Disassembly.

Screw off the shaft nut (50) (sickle wrench), the

shaft nut has a lock to prevent loosening.

If this lock is no longer sufficient, the nut must be

replaced.

Pull off the coupling half (7/P) with the withdrawing

screw.

Remove the key (PF4).
Screw off the nuts (M1) and remove the motor

stool (11).

Remove the seal cover (18). Pre-treat the fitting

surface between the seal cover and the casing
with a brand name rust remover.

Pull off the shaft wearing sleeve (44U or 44B), pull

out the O-ring (OR4).

Evenly press the counter-ring of the mechanical

seal (GLRD..) out of the seal cover (18).

In the event of a break, very sharp edges can
be formed injury risk

Slide the rotating unit of the mechanical seal off

the shaft wearing sleeve (44..). For mechanical
seals with locking screws, loosen these first.

Clean all parts well and check for wear. In

principle, mechanical seals must be replaced.
Repair of the mechanical seal is only
recommended if performed by an expert.

Assembly

Always use a lubricant when assembling the

mechanical seal. We recommend lubricating the
O-ring or rubber gaiter with soapy water just
before assembly. Please do not use mineral
grease or oil if the O-ring is not resistant to such
materials.

Insert the counter-ring of the mechanical seal

(GLRD..) into the seal cover (18). Slide the
rotating unit of the mechanical seal (GLRD..) onto
the shaft wearing sleeve (44..) and affix it (if
possible).

For mechanical seals with rubber gaiter, the

following steps must now be performed quickly.
This is the only way to guarantee that the rotating
mechanical seal unit can still be moved during
installation and will take the correct position.

Slide on the O-ring (OR4) and coat with lubricant

(e.g. silicone grease) using a small brush.

(e.g. silicone grease) using a small brush.
Lubricate the shaft protective sleeve (44) in the

borehole) so that the O-ring groove remains clean
(start approx. 10-15mm inside). Standard O-rings
made of EP rubber are not resistant to oil
emulsive lubricants and must not come into
contact with them. Once resistance has been
ensured (e.g. beef dripping as lubricating agent or

oil resistant O-rings) the entire shaft (24) may be
lubricated.

Slide on the shaft wearing sleeve (44), making

certain that the O-ring can slip lightly into the
groove.

Insert the O-ring (OR3) into the casing and affix

with silicone grease. The O-ring should rest
against the outer diameter if possible (the O-ring
can be enlarged slightly by pulling on it).

Position the seal cover (18) carefully, observing

the direction of the pin (S4) (groove in the bearing
support)

Put the motor stool (11) in place and tighten the

nuts (M1) (see the appendix for the torque).

Insert the key (PF4).
Mount the coupling half (7/M) onto the pump shaft

as described in Section 5.3.2 "Coupling – MPV
Design" and tighten the bearing nut screw (50).

Then assemble the motor according to Section

8.5.1 "Replacing the Rolling Bearing – MPB
Design" .. Assembly.

8.7.4 Model with Standard Rotating Mechanical
Seal (Code "SA, SB, SC, SD, SE and SF") – MPV
Design
For the associated sectional drawing, see the
appendix.

Disassembly

Disassemble the pump as described in Section

8.5.2 "Replacing the Rolling Bearing – MPV
Design" Disassembly.

Remove the bearing cover (12), spacer sleeve

(72) and thrower (73P).

Remove the key (PF3).
Screw off the nuts (M1) and remove the bearing

pedestal (8).