CPX, CPXR, CPXN and CPXP USER INSTRUCTIONS ENGLISH 71569117 02-10
Page 26 of 44
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6.9.3 Gaskets and O-rings [4590, 4610]
After dismantling, discard and replace.
6.9.4 Bearings [3011,3013]
It is recommended that bearings are not re-used after
any removal from the shaft.
The bearings and lubricant are to be inspected for
contamination and damage. If oil bath lubrication is
utilized, these provide useful information on operating
conditions within the bearing housing.
If bearing damage is not due to
normal wear and the lubricant contains adverse
contaminants, the cause should be corrected before
the pump is returned to service.
6.9.5 Bearing labyrinths/isolators [4330]
Labyrinth seals and bearing isolators should be
inspected for damage but are normally non-wearing
parts and can be re-used.
Bearing seals are not totally leak free devices. Oil from
these may cause staining adjacent to the bearings.
6.9.6 Bearing housing and carrier [3200, 3240]
Inspect the bearing carrier circlip groove. Ensure it is
free from damage and that housing lubrication
passages are clear.
Replace grease nipples or the filter breather (where
fitted) if damaged or clogged. On oil lubricated
versions, the oil level sight glass [3856] should be
replaced if oil stained.
6.10 Assembly
To assemble the pump consult the sectional
drawings. See section 8, Parts lists and drawings.
Ensure threads, gasket and O-ring mating faces are
clean. Apply thread sealant to non-face sealing pipe
thread fittings.
6.10.1 Bearing housing and rotating element
assembly
a) Clean the inside of the bearing housing [3200],
bearing carrier [3240] and bores for bearings.
b) Attach bearing housing support foot.
c) The following methods are recommended for fitting
the bearings onto the shaft:
Method 1: Use a hotplate, hot bath, oven or
induction heater to heat the bearing race so it can
easily be placed in position then allowed to shrink
and grip the shaft. It is important that the
temperature is not raised above 100 ºC (212 ºF).
Method 2: Press the bearing onto the shaft using
equipment that can provide a steady, even load to
the inner race. Take care to avoid damaging the
bearing and shaft.
d) Fit the thrust ball bearing [3013] on to shaft [2100].
e) The double row thrust bearing will not normally
have a single filling slot, as such bearings are
limited to taking thrust in only one direction. If
such a bearing replacement is used, it must be
positioned on the shaft so that the bearing filling
slot faces the impeller end of the shaft.
f) If the pair of angular contact thrust bearings are to
be fitted, these must be mounted back-to-back, as
shown below:
Grease
retainer
[3864]
Grease retainer (clearance type) is only
fitted on grease lubricated option units
g) With bearings at ambient temperature, screw on
to the shaft the self-locking bearing locknut
[3712.1] (with its polyamide insert facing away
from the bearing) until tight.
h) With double row thrust bearings place the
bearing circlip [6544] over the shaft, with the
tapered face facing the impeller end.
i)
With the pair of angular contact thrust bearing
option, the bearing locknut [3712.2] should be
placed placed on the shaft before fitting the pump
radial bearing having the larger diameter end
facing the impeller end.
j)
Fit pump radial ball bearing [3011] onto the shaft
using Method 1 or 2 above.
k) With the NUP roller bearing option, the loose ring
should be against the shaft shoulder.
l)
Fit O-ring [4610.2] on the bearing carrier. Lightly
lubricate the bearing carrier bore and O-ring.
m) Ensure the shaft keyway edges are free of burrs.
During installation, use tape or similar over the
keyway to avoid damaging the drive side bearing
seals.
n) Slide the bearing carrier [3240] onto the
shaft/bearing assembly and insert bearing circlip
[6544] into the carrier groove or screw up the
bearing locknut [3712.2].
o) On grease lubricated pumps, pump grease
through the grease nipple in the bearing carrier
[3240] until grease is visible in the bearing races.
p) Check shaft [2100] for free rotation.
