41
WARNING
The armature must be dismantled or reassembled from the drive end side of the stator.
Dismantling
R Make sure the machine and fan motor are
electrically disconnected.
R Remove air ducts (if present at installation),
disconnect coupling or V-belts and dismantle
the machine from the foundation.
R Remove accessories if necessary as well as
inspection covers.
R Loosen the leads and cables inside the termi-
nal box which go to the stator.
R Disconnect leads which go to the stator from
the brush rocker.
R Remove the brushes and wrap a piece of
1 mm thick insulating material around the
commutator.
R Put blocks underneath the stator so that both
end shields are unsupported.
R Remove the terminal box.
R Remove N-end outer bearing cover.
R Place a piece of insulating material between
armature and stator.
R Unscrew the fixing bolts which tie stator and
end shield together at the N-end.
R Remove the end shield at the N-end. Do not
damage the main gasket between end shield
and stator. Do not use sharp-edged tools.
R Remove the outer bearing cover at the D-end.
R Unscrew the end shield fixing bolts at the
D-end. Use the same precautions regarding
the main gasket.
R Lift the armature out of the stator (if neces-
sary use an extension tube slipped over the
armature shaft).
R Protect the bearings against contamination
by suitable means.
R Remove the main gasket very carefully from
the stator.
R Clean the bearing covers and remove the old
grease.
Reassembling
R Wrap a piece of 1 mm thick insulating
material around the commutator.
R Place a suitable piece of insulating material
into the lower part of the stator.
R Inspect the main gaskets on the stator for
damage. Make sure that the mating surfaces
of stator and end shields are clean.
R Do not forget to fill the bearings with grease
during assembly.
R Lift the armature into the stator.
R Assemble the end shield at the D-end.
R Assemble the bearing details at the D-end.
R Assemble the end shield at the N-end.
R Remove the piece of insulating material.
R Thread the cables through the seal into the
terminal box.
R Assemble the bearing details at the N-end.
R Check that the armature turns easily.
R Fasten the leads to the brush gear.
R Assemble the terminal box and attach cables
and leads according to the terminal diagram.
R Remove the protective insulating material
from the commutator.
R Insert brushes into brush holders and check
that they can move freely in their brush hold-
er pockets.
R Assemble inspection covers including
gaskets.
R Assemble all accessories.
Tightening torque for stator bolts
Dismantling and reassembling
D-end
N-end
Fig. 27
DMI Torque with oil lubrication
180 190 Nm (140 lb.ft)
200 190 Nm (140 lb.ft)
225 420 Nm (310 lb.ft)
250 735 Nm (540 lb.ft)
280 735 Nm (540 lb.ft)
315 420 Nm (310 Ib.ft)
400 735 Nm (540 Ib.ft)
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