Flowserve DMX - Manual (Page 43)

DMX/DMXD/DMXH/DMXDH USER INSTRUCTIONS ENGLISH 85392728 - 10/09
Page 43 of 60
d) If this minimum movement is not obtained, the
cause must be investigated and corrected.
6.8.8
Check rotor axial float
a) Push the rotor toward the coupling end as far as
it will go.
Do not force rotor.
Some of the rotor weight may have to be
supported externally. The impeller rings contacting
the channel rings are now supporting the rotor.
b) Place a piece of masking tape on the shaft (if
seal is used) or shaft sleeve (if seal chamber is
used), in the seal chamber area, at the thrust end
of the pump. Place a scale across the face of the
seal chamber and make a line on the masking
tape.
c) Push the rotor toward outboard end as far as it
will go. Using scale, mark another line on
masking tape.
d) Measure and record the total rotor end float
between the two lines. The acceptable minimum
end float is given on the pump sectional drawing
(included in section 8). If this minimum end float
is not obtained, the cause must be investigated
and corrected. Two of the most likely causes
could be:
•
Impellers not properly seated against the split
ring.
•
Improperly machined part, i.e. impeller ring or
channel ring.
e) Mark another line midway between the first two
lines. This centerline represents the centering of
the impellers within their volutes. Masking tape is
to be left on shaft for use in centralize rotor
axially.
6.8.9
Horizontal and vertical shaft alignment
a) Assemble Plain Bearing:
•
Rig bearing housing [3200] to casing. Install
dowel pins [6810] and snug cap-screws
[6570]. Install both horizontal and vertical
adjusting screws [6570] in the bearing
housing mounting flange. Remove dowel
pins [6810].
•
Wipe a film of oil on journal area of shaft.
Place lower half of bearing lining on shaft.
Wipe a film of oil on lower half of bearing
lining. Roll lower half of bearing lining into
lower half of bearing housing [3200].
b) Assemble Thrust Bearing:
•
Install shim pack [3126] against shoulder of
shaft. If shim pack thickness was not
recorded at disassembly or if rotor was
rebuilt completely, install approximately 1/16
inch of shims.
•
Assemble thrust collar key [6700] and thrust
collar [3610] to shaft. Fit lock nut [3713].
•
Rig the lower half of bearing housing [3200]
to an overhead hoist as done during
disassembly. Assemble lower half of thrust
bearing housing [3200] to casing. Install both
the horizontal and vertical adjusting screws
[6570] in bearing housing mounting flange.
Remove dowel pins.
•
Wipe a film of oil on journal area of shaft.
Place lower half of bearing lining on shaft.
Wipe a film of oil on lower half of bearing
lining and roll lower half of bearing lining into
lower half of bearing housing.
Bearing housings have been preset at
factory and dowelled to the casing. Rotor vertical and
horizontal alignment should be checked. Rotor
should turn with no indication of binding. Should rotor
require further adjustment, remove dowel pins [6810]
and proceed with steps c), d) and e).
c) Using a dial indicator and the adjusting screws
[6570], adjust the horizontal and vertical position
of the shaft inside the seal chamber to within
0.0254 mm (0.001 in.) radially.
d) Repeat step c) on thrust end, then recheck plain
end. Pump shaft should turn free with no
indication of binding or rubbing. This should be
taken into account when making adjustments.
e) If rubs occur, adjust the rotor upwards in
0.025 mm (0.001 in.) increments. Check
alignment at both ends after each movement.
After adjustment, check for rubs.
f) When vertical and horizontal alignment is
obtained, tighten bearing housing bolting-except