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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
Lubricate the spherical surface inside the housing
with the same type of oil as specified for the
same bearing.
Raise the shaft (i.e. using oil jacks) sufficiently to
allow the assembly of the lower bearing half.
Carefully locate the lower bearing half (15) and
insert it into the bottom part of the housing (6) by
turning.
Release the shaft on the bearing taking care of
the lining of the joining surfaces of the bearing
and the housing.
Warning!
The following step is the most delicate of the
whole reassembling process. A wrong axial or
radial
positioning
operation of the motor, the contact between the
rotating and fixed parts of the labyrinth flame
seal, with consequent serious damages.
Carefully locate the labyrinth flame arrester (18).
The reassembling operations must assure that
the flame arresters are perfectly centered (both
axially and radially) with the labyrinth ferrule
provided on the shaft. Remember that the gap
between the static and the rotating parts of the
flame arresters is very small, in the order of 0.1-
0.2 mm. To check the right centering, before
assembling measure the gap between the outer
surface of the shaft and the seat of the seal using
together a cylindrical and a plain gauge of proper
thickness.
satisfactory, correct it by inserting or modifying
the appropriate thickness (brass is suggested)
upon the fitting between the bottom half housing
and the endshield.
REMARK: Using the original bottom half housing
the centering is practically already assured and
the conical pins will go again without problems
into their original fitting. In case of complete
bearing replacement including housing, a new
centering operation must be done and the pins
must be relocated into new fittings.
After centering the labyrinth flame arrester raise
again the shaft in order to release the weight of
the rotor from the bearing.
can
cause,
during
In
case
the
centering
is
Check the centering of the bearing versus the
shaft journal. The journal shall be centered within
1 mm respect the lateral shoulders of the
bearing.
Following this, fit the loose oil ring (14). Again,
particular care must be taken to ensure the safe
operation of the bearing. When handling the oil
ring, take care not to affect its perfect geometry
(ovality, flatness).
Place the oil ring onto the shaft and mount the
bolts at the split of the oil-ring.
Check the ring as to joint offsetting and align the
ring halves in parallel, if necessary.
Tighten the bolts according to the torque
indicated:
the
Bearing
size:
Torque Nm:
Bearing size can be seen at the nameplate of
the bearing housing!
Put on the upper shell and make sure that the
identification numbers embossed in the upper
and lower shell (near the splitline) are identical
and are located at the same side and in the
original direction of installation.
Warning!
Incorrect assembly may cause severe
damage to the shaft, the bearing shells or
not
to the flame arresters.
Now prepare the inboard seal (11) for installation.
Place the lower half of the seal with oil drain
holes to the inside of the bearing, turn it into
position and align it parallel to the split-line. Insert
in place the garter spring.
Place the upper half on the shaft (anti-rotation
stopper directed to the inside of the bearing) and
join the two ends of the garter spring.
Check again the parallel alignment of the seal
parts,
as
well
system/split-line of housing.
Repeat the same steps for the inner oil seal of
the shaft end side (10).
Sheet No.
3AAM101048 E
Rev. B
01.2023
Page 4 of 5
9
11 14
18
22 28
1.4
2.7
a
parallelism
of
sealing
Issued by: MOLM
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