Manual Handle Adjustment - GE AKR-30 Series Maintenance Manual

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SECTION 7 -Breaker Maintenance (Cont.)
The areas requiring l ubrication are:
1 . Contacts - A thin fil m on the stationary and
movable contact assembly pivot surfaces. Refer to
Section 8.
Racking Mechanism - The drive threads, jamb
2.
nut/trunnion interface, thrust washer/collar interface,
and the shaft support bearings.
7.13.
3. Manual Operating Handle - Lubricate the two pivot
areas associated with the adjustment linkage. Also,
the handle, mounting shaft/support bushing inter­
face. Refer to Section 7.2.
4. Flux Shifter - Lubricate pivoting and sliding sur­
faces of the reset linkage. Refer to Section 1 0.3.
5. Switchette - Lubricate the activator lever surface
that contacts the switchette button.
Mechanism - All accessible bearing and sliding sur­
6.
faces that have been factory lubricated.
7. Primary Disconnects - Lubricate the finger contact
surface just prior to installing in switchgear or
lubricate and then cover the disconnect assembly to
protect from dust, dirt, etc. Refer to Section 7.5
Before lubricating, remove any hardened grease or dirt
from the latch and bearing surfaces. After lubricating,
remove all excess lubricant of dirt·or dust. The use of
cotton waste to wipe bearing surfaces should be avoid­
ed. The cotton ravelings may bec. o me entangled under
the bearing surfaces and destroy the surface of the bear­
ing.
Refer to Section
FIG . 20

MANUAL HANDLE ADJUSTMENT

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MANUAL HANDLE ADJUSTMENT
7.2
On manually-operated AKA breakers, the closing
springs may be charged either by a single 1 35 degree
clockwise handle stroke or up to four multiple strokes of
lesser swing. The following adjustment procedures should
be performed using the single-stroke method. By so doing,
proper multi-stroke operation is assured.
There are two handle adjustment linkage designs in use.
The adjustment linkage connects the handle assembly to
the chain drive mechanism which turns the cam shaft. The
length of this linkage provides the handle adjustment.
If the link is too long, the handle stroke cannot extend the
closing spring enough for it to go over center. In this event,
use the maintenance handle to complete the spring charg­
ing. The breaker can then be closed and opened prepara­
tory to further shortening of the link.
If the link is too short, one-stroke charging is not possi­
ble. However, more than one stroke will charge the
springs.
The original linkage design used a double-ended stud in
the linkage center. A hex section in this stud allowed adjust­
ing with an open-end wrench. When looking down on the
breaker, turning the wrench clockwise lengthens the link.
The opposite motion shor:tens it. The range of adjustment
is 300 degrees. In the confined space available, each
wrench stroke imparts 1 5 degrees movement. The best
setting is approximately mid-range.
The present design is shown in Fig. 20. This linkage is
assembled together on a threaded stud. Adjustment is
accomplished by removing the upper linkage assembly
from the handle assembly and changing the linkage length
by turning the upper linkage up or down the threaded stud.
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