ACCO Brands LOUDEN 200 Series, Installation, Operation, Maintenance And Parts Manual

Page: 138 / 144

Figure 5
Armature Replacement
CAUTION: Load to be removed or blocked. Brake will be
inoperative during this procedure.
If you replace the magnet assembly, it may be necessary to
replace the armature (15J). If it is badly deformed, it will be
difficult to make the magnet quiet.
1. To replace, remove operator assembly (15) from
brake. See “Friction Disc Replacement Steps 1-3” on
page 5.
Remove nuts (15T), springs (15S) and carriage bolts
(15R). This will allow the armature plate assembly to
be removed from magnet bracket.
2. Remove screw (15Q), lockwasher (15P), locking
plate (15N), two screws (15M), spacers (15L), and
armature (15J). Inspect these parts and shock mount
(15K). If worn, replace them also.
3. Put armature in place (ground side up) and install
spacers (15L) and screws (15M).
NOTE: See Fig. 5 Screws (15M) should be tightened
to remove slack only. Then back off, counterclockwise
on screw so that the next flat on screw is parallel
with edge of the armature plate (15F).
Install locking plate (15N), screw (15Q), and lock-
washer (15P). Tighten screw with 30 lb. in. torque.
4. Reassemble to magnet bracket (15C) using items
(15R), (15S) and (15T). Reassemble operator
assembly to brake bracket. Set magnet air gap “A”
and set torque springs (15S) to 1” as shown in Fig. 3.
Pivot Stud Adjustment
CAUTION: Load to be removed or blocked. Brake will be
inoperative during this procedure.
This adjustment is made at the factory and may be required
when replacing the magnet assembly (15A) or the armature
(15J).
The purpose is to regulate the height of the armature plate
(15F) so that when the magnet (15A) is energized, the
armature (15J) is parallel with it. This is required so that
the magnet will be quiet.
NOTE: Cover (20) must be removed to make this adjustment.
1. To adjust: Hold nut (19) which is adjacent to washer
(18) and loosen the other nut (19) and remove it from
the stud.
2. Energize the magnet and turn remaining nut (19)
counterclockwise slowly until the magnet becomes
noisy. Turn magnet on and off several times until you
find the position where the magnet first becomes
quiet.
At this point, turn nut (19) 1/3 turn (two flats) in a
clockwise position. Hold nut in this position and turn
magnet on and off to make sure the magnet does not
become noisy.
3. Holding this nut in place, screw on other nut and
tighten it against the nut you are holding. Tighten
firmly.
4. Operate the manual release. If the release does not
operate properly, see “Manual Release Adjustment”
on next page.
6