11
Meganorm
11.4.1
Dismantling sequence of pump
1) Close the suction and pressure valves. Drain the
pump, taking the threaded plug off. (903.3).
2) Close the valve and disconnect the auxiliary piping (if
any).
3) Remove the coupling cover.
4) Remove the oil level pointer (639) and the threaded
plug (903.6) and drain the oil from the bearing bracket.
5) If the coupling has a spacer, remove it; if it doesn’t
have one, disconnect the sleeve removing the driver.
6) Remove the coupling from the pump shaft, loosening
before the coupling fixing Allen bolt.
7) Loosen the bolts that fix the support foot to the base
plate.
8) Loosen the bolts (901.2) or bolts (901.4) when
necessary.
9) Remove all the set by fastening uniformly the
extracting bolts.
10) Support the overhang side of the set with a piece of
wooden. Lock the shaft using a device in the region of
coupling sleeve key (940.2)
11) Loosen and extract the impeller bolt (906), the flat
gasket (400.4) and the circlip (932).
12) Extract the impeller (230), the key (940.1) and the
gasket (400.1).
13) Loosen the bolts (901.4). Loosen the nuts (920.2) and
extract the gland cover (452) (if any). Extract the
discharge cover (163) and the flat gasket (400.2).
Extract the shaft protecting sleeve (524) and the seal
components (433) (if any).
14) Extract the thrower (507) and the key (940.2).
15) Loosen the bolt (901.6) and release the support foot
(183).
16) Loosen the bolts (901.5), extract the bearing cover
(360) and the flat gasket (400.3). Take care not to
damage the radial shaft seal rings (421) which come
outside with the bearing cover.
17) With a piece of lead, strike against the shaft (210)
suction side, in order to make the external surfaces of
the radial ball bearings (321) run inside of the bearing
bracket (330) until the complete extracting.
18a) Extract the parts of the sealing chamber, gland
packing (461) and lantern ring (458). (Pumps with
packing).
18b) Extract the stationary face of mechanical seal (433)
from the pressure cover (163) (pumps with
mechanical seal).
After these instructions are completed, the parts will be
available for analysis and maintenance.
11.4.2 Dismantling sequence of the pump with
mechanical seal and seal gland
Loosen the auxiliary pipings and the seal gland. Follow
the instructions mentioned in the O&M booklet of the
Mechanical Seal Manufacturer, which will be attached to
the pump, in case of seal supply.
11.5 Assembly
instructions
All the parts should be cleaned and deburred before the
assembling.
11.5.1 Unauthorized modification and manufacture
of spare parts
Modifications or alterations of the equipment supplied
are only permitted after consultation with the
manufacturer and to the extent permitted by the
manufacturer. Original spare parts and accessories
authorized by the manufacturer ensure safety. The use
of other parts can invalidate any liability of the
manufacturer for consequential damage.
11.5.2
Assembling sequence of the pump
Before the assembly at the shaft, the bearings should be
heated at a furnace or with an oil bath up to a maximum
temperature from 176ºF (80ºC) to 194ºF (90ºC) over the
shaft temperature during 30 minutes, observing the
maximum limit of 257ºF (125ºC).
1) Assemble the radial ball bearings (321) at the shaft.
With a piece of lead, assemble the shaft at the
bearing bracket, from the suction side, making the
external track of the bearing to slide inside the
bearing bracket until it reaches equal
measurements at the both sides of the bearing
bracket in order to allow grooving of the bearing
covers.
2) Assemble the radial shaft seal ring (421) at the
bearing covers (360). Assemble the covers carefully
not to damage the radial shaft seal rings with the
flat gaskets (400.3).
3) Fasten the bolts (901.5). Fit the support foot (183)
and fasten the bolt (901.6) with its washer (554.3).
4) Support the overhang side of the bearing bracket
(330) with a piece of wooden. Introduce the
centrifugal ring at the shaft, without touching the
bearing cover.
