VC
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©Copyright Eaton Corp., 2019. All rights reserved.
4.1.2.5
Backing Plate Wear
- Wear on the ends of the
backing plates from bearing against the side plates
is indicative of misalignment or thrusting. If wear is
on one end only, and uniform for all backing plates,
a worn drum may be causing the shoes to thrust as
the element engages. If wear exists on both ends of
all of the backing plates, excessive misalignment is
probably the cause. Slight notching in the torque
bar cavity is normal; however, if the notching occurs
in a short amount of time, check shaft alignment. If
both walls in the torque bar cavity are notched,
there may be a significant vibration (torsional)
problem.
4.1.2.6
Release Springs and Torque Bars
- Excessive
wear at the ends of the torque bars where the
release spring rides indicates excessive parallel
misalignment.
4.1.2.7
Side Plates
- Any wear on the backing plates will
also be reflected as elongation of the torque bar
holes in the side plates.
4.1.2.8
Contamination of Friction Shoes
- Mild oil or
grease contamination may be removed with a
solvent. Linings which have become saturated must
be replaced. Also, linings that have been charred
from excessive heat must be replaced.
⚠
CAUTION
When using any solvent, always follow the
appropriate safety precautions.
4.1.2.9
Excessive Dust Accumulation
- If dust becomes
packed in the backing plate cavities, a pressurized
enclosure should be considered. Excessive
accumulations will prevent complete shoe
retraction.
4.2
Removal of Element Assembly and
Drum (Narrow, Dual Narrow and Single
Wide)
⚠
WARNING
Prior to removal of the clutch or brake, make
sure the machinery is in, and will remain in a
safe condition.
4.2.1
Match mark the element to the spider and the drum
to the drum hub.
4.2.2
Disconnect the element from the spider and allow it
to rest on the drum.
4.2.3
Connect an overhead support to the element and
apply enough tension to support the weight of the
element and drum.
4.2.4
Remove the fasteners attaching the drum to the
drum hub and hoist the element/drum out from
between the shafts.
⚠
CAUTION
Use extreme care when disconnecting the drum
from the hub. Shear points exist at the
mounting holes.
4.3
Removal of Element Assemblies and
Drums (Dual Wide)
4.3.1
Match mark the element assemblies to each other
and to the spider. Also, match mark the drums to
each other and to the drum hub.
4.3.2
Disconnect the dual element from the spider and
allow it to rest on the drums. Remove the air
connection tubes.
4.3.3
Remove the fasteners and spacers attaching the
element halves together.
4.3.4
Attach an overhead support to the spider-side
element and apply enough tension to support the
weight of the element half and one of the drums.
4.3.5
Remove the through bolts and nuts attaching the
drums to the drum hub. DO NOT REMOVE THE
SHORT SCREWS AND LOCKWASHERS WHICH
HOLD THE FEMALE DRUM ONTO THE DRUM
HUB. Carefully hoist the spider side element and
drum out from between the shafts.
4.3.6
Attach an overhead support to the remaining
element and apply enough tension to support the
weight of the element and drum.
4.3.7
Remove the short screws and lockwashers holding
the drum onto the drum hub and carefully hoist the
element and drum out from between the shafts.
⚠
CAUTION
Use extreme care when disconnecting the
drums from the drum hub. Shear points exist at
the mounting holes.
4.4
Removal of Spider and Drum Hub
4.4.1
Puller holes are provided for removal. It will usually
require heating along with the puller. When heating,
heat uniformly to prevent hot spots.
