CPX, CPXR, CPXN and CPXP USER INSTRUCTIONS ENGLISH 71569117 02-10
Page 24 of 44
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a) Disconnect the coupling if it has limited axial
flexibility
b) Record the gap between the bearing carrier
[3240] and bearing housing [3200] using feeler
gauges.
c)
Loosen the bearing carrier screws [6570.2] and
back off the bearing carrier 2 mm (0.08 in.) using
the jacking screws [6570.3].
For CPX, CPXN and CPXP
d) Tighten the bearing carrier screws [6570.2] evenly,
drawing the bearing carrier towards the bearing
housing, until the impeller [2200] contacts the pump
casing. [1100] Turn the shaft [2100], during this
procedure, until a detectable rub is obtained. This
is the zero clearance position.
e) Set a dial indicator to zero on the shaft end or
measure the bearing carrier to bearing housing
gap and record the measurement.
f) Slacken the bearing carrier screws [6570.2].
g) Tighten jacking screws [6570.3] evenly (about one
flat at a time) until the dial indicator or feeler gauge
shows the correct impeller clearance from the zero
clearance position. This clearance should be
between 0.3 and 2 mm (0.008 and 0.080 in.)
depending on the nature of the pumped fluid. (See
table above.)
h) Evenly tighten the bearing carrier screws [6570.2]
keeping the dial indicator or feeler gauges
reading the correct setting. Then tighten the hex
nuts [6580.1] to lock the jacking screws in
position.
For CPXR only
The impeller does not have a fine front
clearance setting and adjustment of the impeller
is not normally required.
d) Tighten the jacking screws [6570.3] evenly, pushing
the bearing carrier away from the bearing housing,
until the impeller [2200] contacts the cover. [1220]
Turn the shaft [2100], during this procedure, until a
detectable rub is obtained. This is the zero
clearance position.
e) Set a dial indicator to zero on the shaft end or
measure the bearing carrier to bearing housing
gap and record the measurement.
f) Slacken the jacking screws [6570.3].
g) Tighten bearing carrier screws [6570.2] evenly
(about one flat at a time) until the dial indicator or
feeler gauge shows the correct impeller clearance
from the zero clearance position. This clearance
should be 1.5 - 2 mm (0.06 - 0.08 in.) (See drawing.)
h) Tighten the jacking screws [6570.3] until they
contact the bearing carrier, keeping the dial
indicator or feeler gauges reading the correct
setting. Then tighten the hex nuts [6580.1] to
lock the jacking screws in position.
For all pump types
i)
Compare the original and final gaps between the
bearing carrier and bearing housing to check if
the movement of the shaft has exceeded the seal
capability (over/under compression of seal).
Re-position the seal to correct this.
j)
Check that the shaft [2100] can turn freely without
binding.
k) If a cartridge seal [4200] is fitted it should be
reset at this point.
l)
Ensure the coupling distance between shaft ends
(DBSE) is correct. Reset/re-align if necessary.
6.8 Disassembly
Refer to Safety section before dismantling the
pump.
Before dismantling the pump for
overhaul, ensure genuine Flowserve replacement
parts are available.
Refer to sectional drawings for part numbers and
identification. See section 8, Parts lists and drawings.
6.8.1 Bearing housing
To remove, proceed as follows:
a) Disconnect all auxiliary pipes and tubes where
applicable.
b) Remove coupling guard and disconnect coupling.
c) If oil lubricated frame, drain oil by removing drain
plug [6569.3].
d) Record the gap between the bearing carrier and
bearing housing so that this setting can be used
during workshop assembly.
e) Place hoist sling through bearing housing window.
f) Remove casing screws [6570.1] and support foot
to baseplate screws.
