DURCO MARK 3 ISO FRAME MOUNTED ENGLISH 85392719 06-12
Page 30 of 52
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c) Rotating the bearing carrier [3240] the width of one of
the indicator patterns cast into the bearing carrier
moves the impeller [2200] axially 0.1 mm (0.004 in.).
Example: for an impeller setting of 0.4 mm (0.016 in.)
simply move the bearing carrier clockwise four
indicator patterns for the required clearance.
d) Use the indicator pattern closest to the top centre
of the bearing housing as the reference point to
begin adjustment.
e) After obtaining the proper clearance, listed in the
table above, tighten the set-screws [6570.1] evenly
to lock the impeller [2200] and shaft [2100]
assembly. Tightening the screws [6570.1] will
cause the impeller to move 0.05 mm (0.002 in.)
closer to the rear cover because of the internal
clearance in the bearing carrier threads. This must
be considered when setting the impeller clearance.
f) If a cartridge seal [4200] is fitted it should be
reset at this point.
g) Check that the shaft can turn freely without
binding.
h) Ensure the coupling distance between shaft ends
(DBSE) is correct. Reset/re-align if necessary.
6.7.3
Setting recessed impeller rear clearance
a) Recessed open impellers are set off the cover.
This allows the impeller to be set without the casing.
b) Turn the bearing carrier [3240] counter-clockwise
until the impeller [2200] comes into light contact
with the cover [1220]. Rotating the shaft [2100]
at the same time will accurately determine when
a detectable rub is obtained. This is the zero
clearance setting.
c) Rotating the bearing carrier [3240] the width of one of
the indicator patterns cast into the bearing carrier
moves the impeller [2200] axially 0.1 mm (0.004 in.).
Example: for an impeller setting of 1.5 mm (0.059 in.)
simply move the bearing carrier clockwise fifteen
indicator patterns for the required clearance.
d) Use the indicator pattern closest to the top centre
of the bearing housing as the reference point to
begin adjustment.
e) After obtaining the proper clearance of 1.5 mm
(0.059 in.) to 2 mm (0.079 in.), tighten the set-
screws [6570.1/2] evenly to lock the impeller
[2200] and shaft [2100] assembly. Tightening the
screws will cause the impeller to move 0.05 mm
(0.002 in.) closer to the rear cover because of the
internal looseness in the bearing carrier threads.
This must be considered when setting the
impeller clearance. If possible, check results with
a feeler gauge.
f) If a cartridge seal [4200] is fitted it should be
reset at this point.
g) Check that the shaft can turn freely without
binding.
h) 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 disassembly
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.
d) Record the gap between the bearing carrier
[3240] and bearing housing [3200] so that this
setting can be used during workshop assembly.
e) Place hoist sling through bearing housing adaptor
window.
f) Remove casing nuts [6582.1] and support foot
[3134] to baseplate screws.
g) Remove bearing housing assembly from pump
casing [1100].
h) The two threaded holes in the adaptor flange can
be used for jacking screws to assist with removal.
Summary of Contents for Durco Mark 3
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