Manual Handle Adjustment - GE AKR-30 Series Maintenance Manual

SECTION 7-Breaker Maintenance (Cont.}
The areas req u i ri ng l u brication are:
1 . Contacts Pivots - A t h i n fi l m on t he stat ionary
and movable contact assembly pivot surfaces. Refer
to Section 8. Do not lu bricate the contact tips.
2. Racking Mechanism - The drive t h rea
nut/tru nn ion i nterface, thru st washer/col l ar mterface,
and the shaft support beari ngs.
7 . 1 3.
3. Manual Operating Handle - Lubricate the two pivot
areas associated with the adj u stment l i n kage. Also,
t he hand le, mounting shaft/su pport bush i ng i nter­
face. Refer to Section 7.2.
4. F l ux Shifter - Lubricate pivoting and s l i di ng sur­
faces of the reset l i n kage. Refer to Sect ion 1 0.3.
5. Switchette - Lubricate the activator lever surface
that contacts the switchette button.
6.
Mechan ism - All accessible beari ng and s l i ding sur­
faces t hat have been factory l u bricated.
7. Pri mary Disconnects - Lubricate the fi nger contact
surface just prior to i nstal l i ng in switchgear or
l u bricate and t hen cover the d i sconnect assembly to
protect from d ust, d i rt, etc. Refer to Section 7.5
Before l u bricating, remove any h ardened grease or d i rt
from the l atch and bearing su rfaces. After l u bricating,
remove all excess l ubricant to stop accumulation of d i rt or
d ust. The use of cotton waste to wipe bearing surfaces
should be avoided. The cotton ravelings may become
entangled under the bearing surfaces and destroy the
su rface of the bearing .
?
s, jam b
Refer to Section
FIG . 20 - MANUAL HANDLE ADJ U STMENT
7.2

MANUAL HANDLE ADJUSTMENT

The adjustment l i n kage co nnects 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, charging is not possible.
The orig inal linkage design used a double-ended stud in
the l inkage center. A hex section in this stud allowed adjust­
ing with an open-end wrench . When looking down on
breaker, turning the wrench clockwise lengthens the hnk.
The opposite motion shor.tens it. The range of adjustment
is 300 degrees. In the conf ined 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 l inkage 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 th readed stud.
the
.
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