Flowserve CPXVC - Manual (Page 23)

CPXVC USER INSTRUCTIONS ENGLISH 26999930 03-11
Page 23 of 32 flowserve.com
Where a mechanical seal is used, extreme cleanliness
is required during assembly. In many instances a pre-
assembled cartridge seal will be used. Where this is not
the case the sealing faces must be checked to be free
from scratches or other damage. Use olive oil for fitting
elastomers.
a) Where an anti-rotation pin is fitted ensure that
correct engagement with the slot is achieved.
b) Carefully press stationary mechanical seal seat(s)
into their housing such that these are not deformed
or damaged.
c) Work to the specific manufacturer’s
instructions for the mechanical seal.
Where a packed stuffing box [4110] is fitted, pack the
stuffing box cover before fitting on to the shaft as
follows:
a) Position each ring [4130] into the box individually,
evenly and firmly.
b) Check that the shaft sleeve [2400.2] freely rotates
after fitting the first ring.
c) Stagger the 45 degree scarf joints by 90 degrees
from each other in the box.
d) Insert the inner two packing rings.
e) Insert lantern ring [4134] halves (if required).
f) Insert the remaining packing rings.
g) Position the gland [4120] squarely against the
last ring, tighten the gland nuts finger-tight only
and install on to bearing housing assembly.
Jacketed sump pumps are fitted with a gland
packing seal at the soleplate.
6.11.2 Bearing housing sub-assembly
a) Clean the inside of the bearing carrier and bores
for the bearings.
b) Fill the grease retaining ring [3864] slot with the
appropriate grease into bearing housing [3200].
The three thin grease rings may now be inserted
into this internal slot.
c) The radial bearing [3011] must be fitted to the shaft
before inserting circlip [6544] over the shaft facing
in the correct direction with taper face, facing the
radial bearing. The optional pair of back to back
thrust ball bearings use a nilos ring held by a
retaining ring which must have the C spanner slots
facing the impeller end. Only then can the thrust
bearing [3013] be fitted to the shaft
(Note 1: If an optional pair of thrust bearings is to
be fitted, these must be mounted back-to-back,
as described below.)
d) Press the thrust bearing(s) [3013] onto the shaft
using equipment that can provide a steady, even
load to the inner race.
e) Use a spatula to fill sides of the bearing with grease
of NLGI 3 grade.
f) On aggressive solvent/acid vapor service
a special fluoro-silicone grease (Molykote FS3451)
may be required. Pack the bearing fully by hand as
no grease nipple is used in the design.
g) Fit the self locking thrust bearing nut [3712] onto
the shaft and tighten with a C spanner.
h) Fit O-ring [4610.1] on the bearing carrier [3240]
and lubricate the bearing carrier bore and O-ring
with oil.
i) Ensure the shaft coupling keyway edges are free
of burrs. If optional proprietary labyrinth type
bearing housing seals [4330] are used the O-
rings should be oiled to assist assembly.
j) Install the bearing carrier onto the shaft/bearing
assembly and insert the circlip [6544] or if
optional pair of back –to –back bearings, screw in
the bearing carrier locking ring into the bearing
carrier. Tighten up the bearing carrier locking
ring using a C spanner.
LH thread.
k) Check shaft [2100] for free rotation.
6.11.3 Installing the shaft sub-assembly
a) Prior to assembling the shaft and bearing carrier
sub-assembly into the bearing housing [3200]
install the bearing housing [3200], or if seal fitted
both the bearing housing and seal stool tightened
together, into the soleplate [6140] and fit using its
fasteners [6570.2] and tighten these. Fit stool
[3160] using its fasteners [6570.3], tighten these.
The shaft assembly may now be fitted into the
motor stool and bearing housing assembly until
the gap between bearing carrier [3240] and
bearing carrier [3200], is approximately 4 mm
(0.16 in.).
b) Install the bearing carrier hexagon screws
[6570.6] and the hexagon screws [6570.5] and
hexagon nuts [6580.3] but do not tighten.
c) Press the flinger [2540.1] onto the shaft, where
applicable. This should be set between 0.5 and 2
mm (0.02 and 0.08 in.) from the bearing carrier.
d) Turn the shaft [2100] to check for freedom from
rubbing.
e) Fit the greasing fittings [3853] and grease relief
[6569].
f) Fit the upper and lower flingers [2540.2 and 2540.3]
at least 6 mm (0.24 in.) from their bearing housing
and cover respectively and tighten.
g) Fit column pipe [1350] to the soleplate and tighten
its fasteners [6580.2 and 6572.1].
h) Fit the cover throttle bush [3300] and stud
[6572.2] into the cover [1220].