Flowserve MNV - Manual (Page 40)

MNV & MNZ USER INSTRUCTIONS ENGLISH 71569188 11/04
Page 40 of 47
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6.9 Assembly
To assemble the pump consult the sectional
drawings, see section 8, Parts list and drawings .
Ensure threads, gasket and O-ring mating faces are
clean. Apply thread sealant to non-face sealing pipe
thread fittings.
6.9.1 Bearing housing assembly - Grease
lubricated
a) Be sure the shoulders where the bearings seat,
are free of burrs and contaminants.
b) Mount the grease retainers into their respective
bores [51, 51A]. Prick punch the outer diameter
at two places 180 o apart to secure them to the
bearing frame, if necessary. Do not remove the
grease retainers on disassembly unless they are
to be replaced.
c) Mount the bearing cups (outer races) [16,18] into
their respective bearing housing bores (either
chill or press in to install). Be sure the cups seat
against the bearing housing shoulders.
d) Assemble the line bearing cone [16] on the shaft
[6] (heat or press to install). See section 6.7.3 for
details.
e) Install the shaft [6] with the thoroughly grease-
packed line bearing cone fitted, through the
housing and support the assembly vertically
(thrust end up).
f) Heat the thrust-bearing cone to approximately
95 o C (200 o F) and assemble it on the shaft
together with the bearing washer [22B], lock
washer [22A], and locknut [22]. Hand tighten the
nut.
g) Assemble the line bearing inner seal [40A], line
bearing cover [35] and outer seal [40A]. Adjust
the bearing endplay; See Bearing End Play
adjustment in section 6.7.4.
h) Pack the thrust bearing [18] with grease.
i) Install the thrust bearing’s inside seal [49], cover
[37] and outside seal [40].
The impeller set screw and wearing ring
screws are locked in place using Loctite 271 or
equivalent. The shaft sleeve is mounted using
Loctite RC/680 or equivalent. Mating surfaces must
be thoroughly cleaned and dry prior to application of
the adhesive compound.
6.9.1.1 Impeller nut
IMPELLER NUT
FILLET
(2 PLACES 18O°APART)
IMPELLER NUT
LOCATION FOR
SQUARE BAR
IMPELLER NUT
SET SCREW
Grease all the contact seal lips before
installation. Position the outside seals (line and thrust
bearing) with minimum lip contact to the covers.
Excessive lip pressure will result in the seal rings
running hot and premature seal ring failure.
6.9.2 Pump assembly
To assemble the pump, reverse the dismantling
instructions previously described.
a) Follow the bearing housing assembly, wearing
ring, packing, and shaft sleeve assembly
instructions. Torque all assembly bolts and
screws to the recommended torque values listed
in section 6.5.
b) If the unit is equipped with a mechanical seal,
refer to the mechanical seal manufacturer's
instructions for installation.
c) Install the rotating assembly in the casing [1].
d) Check that the impeller [2] turns freely and adjust
the wearing ring gap. See section 6.1.6 for
details.
e) Align the pump with the motor; see Section 4.5.
f) Install the packing and seal cage; see Section
6.1.8.
g) Add lubricant as described in Section 5.2.