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Instruction, operation and maintenance instructions
High voltage flameproof motors for explosive atmosphere
AMD Rg 355-400-450-500
Horizontal motors with sleeve bearings – Assembly and
disassembly instructions
Oil lubricated DIN-EF sleeve bearings
Remove the bolts (17) which connect the
endshield (3) with the stator frame. Secure the
bearing endshield (3) to its top centre by using an
eyebolt.
Pull off the bearing endshield (3) from the stator
frame by using 2 bolts in the threaded holes of
the endshield.
The bearing endshield can now be carefully
leaned on the shaft.
Repeat the same steps in order to remove the
other endshield (DE).
Insert presspan or pressboard into the stator
bore, between the stator and rotor magnetic
cores, working from the NDE side.
Using again the crane, lift the rotor sufficiently to
remove the wooden blocks and lean the rotor on
the
stator
protections inserted.
Remove the labyrinth flame seals, marking with
care the annular thicknesses provided for the
axial centering (if any) in order to reassemble
them exactly as they originally were.
Remove the endshields from the shaft.
Fit a presspan or pressboard protection wrapped
around the D-end shaft extension. Slip over the
protection a steel tube of proper diameter to have
a shaft extension and with this withdraw the rotor
from the stator bore traveling from the DE
towards the NDE. This work could be done by
using two cranes or by other mobile adapted
machines. Rotor withdrawal requires a free space
approximately equal to the machine length.
Important: During the a.m. operations pay
attention to avoid any shock that can
damage the inner surface of the stator bore,
the electric connections and the flame
arresters.
Visual checks of sleeve bearings and flame
arrester components
When dismantling the individual components check
that all running surfaces are in perfect conditions,
taking into consideration the period of operation. The
bearing shell should show a uniform wear pattern.
Possible scorings should be smoothed before
reassembling. Damages to the white metal lining, i.e.
wiping and white metal built-up, are not allowed. The
causes shall be investigated and removed. Shaft
seals showing an irregular wear pattern shall be
replaced or their edges chipped.
For insulated bearings, check whether the PTFE film
and the other components (fixing pin (25) and non-
conducting layer on the top part of the housing (2))
are in perfect conditions. Check whether the
core
through
the
pressboard
Sheet No.
3AAM101048 E
Rev. B
Page 3 of 5
geometry of the loose oil ring is correct (ovality,
flatness).
The labyrinth flame arresters surfaces must be free
of burrs or signs of any contacts with the shaft during
the rotation. Check the roundness of the flame
arresters surfaces before reassembling.
Reassembling the machine
The motor can be reassembled in the reverse order
as described for dismantling. First the rotor is
inserted into the stator and leaned on the stator core
surface through a cardboard or presspan protection.
Than the endshield are fitted on the frame. As
general rules, ensure that:
All the plane and spigoted joints surfaces having
small machining roughness must be checked for
absence of scratches or damages and smeared
with a thin layer of silicon grease (see the
relevant drawings for details) before assembling,
to avoid any formation of rust. The spigoted joints
between the frame and the endshields have
reduced clearance between them to assure the
centering between the stator and the rotor, so
their
surfaces
must
molybdendisulphide grease (antirust type!) before
assembling, to avoid the danger of their seizing
up.
All screwed connections inside the motor are tight
and provided with their original locking devices.
Assemble and remove for test purpose the oil
seals around the shaft. Locate the oil seal halves
(10) and (11) on the shaft and insert the garter
spring in its groove.
Warning! The oil seals must turn smoothly on the
shaft. Otherwise overheating and shaft damage will
result during the operation of the bearings.
Disassemble and check seal parts for marks of
undue contact.
Assemble the bearing as follows:
Insert on the shaft extremities the flame arresters
(18)
together
with
their
thicknesses (if any) respecting the original
disposition.
Fit in place the bottom half of the bearing housing
and secure with the bolts (16). If the motor was
delivered with some axial centering thickness
between the bearing support and the endshield
remember to insert them in place respecting the
original situation for dimension and position.
Issued by: MOLM
01.2023
be
smeared
with
axial
centering
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