DURCO MARK 3 ISO FRAME MOUNTED ENGLISH 85392719 06-12
Page 33 of 52
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o) Install the shaft assembly into the bearing housing
[3200] until the gap is approximately 5 mm (0.2 in.).
p) Fit the bearing carrier screws [6570.1] but do not
tighten.
q) Press drive side v-ring [4305] and pump side
liquid deflector [2540] onto shaft [2100] where
applicable. The V-ring type shall be fitted with
light contact with the bearing carrier [3240].
r) The pump side deflector [2540] (this feature is
integral with some proprietary labyrinth seals)
should only be set in its final position after setting
the shaft axial position.
s) Temporarily fit the cover [1220] to the power-end.
The cover, above 125 size, is retained by studs
[6580] and their nuts. The shaft [2100] may now
be positioned in relation to the cover face, by
rotating the carrier, position as shown below:
Bearing housing
Dia. X mm (in.)
Z mm (in.)
Frame 1
24 (0.945)
9 (0.354)
Frame 2
32 (1.260)
17 (0.669)
Frame 3
42 (1.654)
9 (0.354)
Frame 4
48 (1.890)
22 (0.866)
t) The pump side deflector [2540] may then be
moved towards the bearing housing [3200] and
set with its clearance.
0.5 to 2 mm
(0.02 to 0.08 in.)
6.10.2 Seal cover and seal assembly
a) Extreme cleanliness is required. The sealing
faces and shaft [2100] or sleeve [2400] surface
must be free from scratches or other damage.
b) Refer to section 6.11, Seal arrangements for seal
diagrams.
c) Carefully press the stationary seat into the cover
[1220] or mechanical seal cover [4213], ensuring
that the seating ring is not deformed. Where an
anti-rotation pin is fitted ensure that correct
engagement with the slot is achieved.
d) Place any separate seal covers over the shaft
[2100].
e) Refer to manufacturer's instructions to position
the mechanical seal rotating elements. Tighten
any drive screws in the seal drive collar. For
precise compression most cartridge seals should
be set after complete pump assembly.
f) Fit the cover [1220] into the bearing housing
[3200] and tighten all fasteners.
6.10.3 Gland packed stuffing box assembly
a) Assemble the gland packing [4130] into the cover
before fitting on to the shaft [2100], see 6.11.6.
b) Stagger the joints in the gland packing by 90
degrees to each other.
c) The lantern ring halves [4134], if required, should
be positioned mid-way along the packing.
d) Position the gland [4120] squarely against the last
ring and tighten the gland nuts finger-tight only.
Install into bearing housing assembly, fit the two
studs and nuts to hold the cover [1220] in place.
e) Check that the shaft [2100] rotates freely.
6.10.4 Impeller assembly and setting
Impeller assembly and setting
6.10.4.1
a) Fit a new O-ring [4610.1] into the impeller [2200]
using a small amount of grease to hold it in place.
Apply anti-galling compound (which does not
contain copper) to the impeller thread to help
subsequent removal.
b) Assemble impeller [2200] onto the shaft [2100].
c) Tighten the impeller. Use the same method as in
disassembly but rotating in opposite direction. A
few sharp strikes will tighten it to the correct level.
Summary of Contents for Durco Mark 3
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