RDLO
Page 15 of 24
The impeller (234) has a sliding fit on the shaft and
can normally be removed easily. Should there be
any difficulty, use a wooden mallet and knock on
the hub to loosen the impeller in its fit.
7.4 Reassembly
Reassembly is effected in reverse order to
dismantling. For all work on the pump set use the
sectional drawing in conjunction with the list of
components and the assembly instruction for
orientation.
The customary rules of mechanical engineering as
well as the instructions for removal and installation
of shaft seal, impeller wear rings and casing wear
rings (sections 7.5.1 and 7.5.2) must be observed.
The data on cleaning, lubricating and sealing
agents given in the assembly instruction must be
observed, and the tightening torques indicated must
be complied with.
Remove any liquid sealant residues prior to
reassembly. O-rings and V-rings must be replaced
and their seats on the shaft must be cleaned. In
addition, all the sealing elements must be fitted in
the components provided for this purpose prior to
installation,
For reassembling the rotor, position the pump shaft
(211) securely. All fits, threads and sliding fits of the
shaft must be cleaned and coated with assembly
paste as indicated in the assembly instruction.
Insert the keys required for assembly in the pump
shaft (211).
Mount the impeller (234), which has a sliding fit.
When fitting the impeller, observe the direction of
rotation (see diagram below).
For mounting the casing wear rings (502) and
impeller wear rings (503) observe section 7.5.2
"Replacing the casing wear rings and/or impeller
wear rings".
Place the casing wear rings on the running surfaces
of the impeller. Make sure that the bezels of the
rings are on the outside (towards the bearing).
Insert the pins required for fixing the casing wear
rings.
The remaining components are fitted first on the
locating bearing side (i.e. the driven end) of the
pump shaft.
Slide the spacer sleeve (525.3) over the pump shaft
(211).
Slide the shaft seal housing (441) and then the
shaft protecting sleeve (524.2) on the shaft.
Gland Packing
Press the packing rings one at a time into the
stuffing box chamber with the help of the gland
(452, split). Position the butt ends of each ring 90°
to 180° away from those of the previous ring. The
number of rings and the exact positions of neck ring
(457.1) or lantern ring (458), if mounted, are shown
in the sectional drawing. Compression-moulded
rings are to be preferred. After fitting all packing
rings, mount and tighten the gland lightly, so that
the packing rings take on the shape of the stuffing
box chamber. Unscrew the gland again to relax the
packing.
Mechanical Seal
Mount the mechanical seal in accordance with the
manufacturer's instructions in section 9.5 and join it
with the shaft protecting sleeve (524.2), seal cover
(471) and key (940.5). Then, in order to lock the
mechanical seal, engage the discs (550.5) in the
groove of the shaft protecting sleeve (524.2) and
tighten the bolts (901.3). Insert the unit in the shaft
seal housing (441) and fasten it (902.1 and 920.2).
Slide the complete assembly unit over the shaft.
Slide the spacer sleeve (525.1) over the shaft, and
V-ring (411.1) and bearing cover (360) over the
spacer sleeve.
Heat the two angular contact ball bearings (320)
(max 80°C) and fit them on the pump shaft (211). It
is essential to avoid one-sided pressure, e.g.
hammer blows, on the outer rings.
Mount the angular contact ball bearings in X-
arrangement (face-to-face). It is imperative to
ensure that the inner rings of both angular contact
ball bearings are seated on each other without an
axial clearance.
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