Flowserve MJ Slurry - Manual (Page 29)

MJ SLURRY USER INSTRUCTIONS ENGLISH 71569294 - 02/08
Page 29 of 42
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c) Bend up the locking tab on the bearing lockwasher
[6541] and remove the bearing locknut [3712] and
lockwasher [6541].
d) Only if necessary remove the thrust bearings [3031]
from the shaft. Bearings removed and reused can
easily be damaged and undetected until pump is
put back in operation.
e) Remove the thrust bearing housing [3240] from the
shaft.
6.8.6 Line bearing – MVD units
a) Remove the bearing retaining ring.
b) Only if necessary remove the line bearing [3011]
from the shaft. Bearings removed can easily be
damaged and undetected until pump is put back in
operation.
c) The shaft sleeve is held in place with an anaerobic
sealant. To remove heat bearing to break bond or
cut loose from making an axial cut and prying the
sleeve off.
6.8.7 Gland
side Wearplates
a) The wearplate [1915.2] can be removed from the
lower housing [3200] if required. The wearplate is
secured to the stuffing box head [3200] with
studs, nuts and washers.
6.8.8 Suction side wearplates
a) The wearplate [1915.1] can be removed from the
casing [1110] if required. The wearplate is
secured to the casing [1110] with studs, nuts and
washers.
b) To remove the wearplate it may be necessary to
turn the casing upside down and lever the end of
the mounting studs. To prevent damaging the
studs nut can be threaded on and left loose.
6.9 Examination of parts
Used parts must be inspected before
assembly to ensure the pump will subsequently run
properly.
In particular, fault diagnosis is essential to enhance
pump and plant reliability.
6.9.1 Casing, seal housing and impeller
a) Inspect for excessive wear, pitting, corrosion,
erosion or damage and any sealing surface
irregularities.
b) Replace as necessary.
c) Inspect the impeller [2200] and the wearplates
[1915.1] and [1915.2] for excessive wear or
damage. Remove the wearplate from the casing
[1110] if necessary.
d) Inspect the casing [1110] and lower bearing
housing [3200] for damage or excessive thinning of
wall sections due to wear or corrosion. Clean the
internal surfaces to maintain pump efficiency.
e) Inspect the protector plate [4132] and impeller
spacer [2460] and remove if damaged or worn.
Clean the internal bore of the stuffing box.
6.9.2 Shaft and sleeve
d) Replace sleeves if grooved, pitted or worn. The
shaft sleeves are held in place with an anaerobic
sealant or interference fit. To remove heat bearing
to break bond or cut loose from making an axial cut
and prying the sleeve off.
a) Clean the shaft and inspect for evidence of
corrosion, evidence of cracking, fatigue or
mechanical damage. Remove all burrs or nicks
paying particular attention to the areas under the lip
seals. Check that the shaft is straight within 0.002
inch (0.050 mm).
6.9.3 Gaskets and O-rings
After dismantling, discard and replace.
6.9.4 Bearings
a) It is recommended that bearings are not re-used
after any removal from the shaft.
b) The plain liquid lubricated bearings may be re-
used if both the bearing bush and bearing sleeve
show no sign of wear, grooving or corrosion
attack. (It is recommended that both the bush
and sleeve be replaced at the same time.)
6.9.5 Bearing isolators, labyrinths or lip seals
(if fitted)
a) The lubricant, bearings and bearing housing
seals are to be inspected for contamination and
damage. If oil bath lubrication is utilised, these
provide useful information on operating
conditions within the bearing housing.
b) 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.
c) Bearing seals are not totally leak free devices.
Oil from these may cause staining adjacent to the
bearings. Inspect and replace if necessary.
6.10 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.
6.10.1 Line Bearing – MVD Units
a) Install the shaft sleeve [3400] onto the, securing in
place with Loctite A (anaerobic sealant). Ensure
sleeve is set against the shaft shoulder.