GE AKR-30 Series Maintenance Manual page 197

SECTION 7-Breaker Maintenance (Cont.)
The areas requiri ng l ubrication are:
1 . Contacts Pivots - A thin fi l m on the stationary
and movable contact assembly pivot surfaces. Refer
to Section 8. Do not lubricate the contact tips.
2. Racking Mechanism - The drive threa
n ut/trunnion interface, th rust washer/col l ar mterface,
and the shaft support beari ngs.
7. 1 3.
3.
M anual Operating Handle - Lubricate the two pivot
areas associated with the adj ustment l i n kage. Al so,
the handle, mounting shaft/support bushing inter­
face. Refer to Sect ion 7.2.
4. F l ux Shifter - Lubricate pivot ing and sliding sur­
faces of the reset l i n kage. Refer to Section 1 0.3.
5. Switchette - Lubricate the activator lever surface
that contacts the switchette button.
6. Mechanism - All accessi ble bearing and sliding sur­
faces that have been factory l u bricated.
7. Pri m ary Di sconnects - Lubri cate the fi nger contact
surface j ust prior to install ing in switchgear or
l u bricate and then cover the d i sconnect asse mbly to
protect from dust, dirt, etc. Refer to Sect ion 7.5
Before l ubricating, remove any hardened g rease or d i rt
from the latch and bearing surfaces. After l u bricating,
remove all excess lu bricant 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
surface of the beari ng.
?
s, jamb
Refer to Section
FIG. 20 MANUAL HANDLE ADJUSTMENT
-
7.2 MANUAL HANDLE ADJ USTM ENT
The adjustment li nkage 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, charging is not possi ble.
The original linkage design used a double-ended stud in
the linkage center. A hex section i n this stud allowed adjust­
i ng with an open-end wrench. When looking down on the
breaker, turn ing the wrench clockwise lengthens the link.
The opposite motion shor . tens it. The range of adjustment
is 300 degrees. In the conf ined space avai lable, each
wrench stroke i m parts 1 5 degrees movement. The best
setting is approximately m id-range.
The present design is shown in Fig. 20. This l inkage is
asse mbled together on a th readed stud. Adjustment is
accomplished by removing the upper l i nkage assembly
from the handle assembly and chang ing the linkage length
by turning the upper l i nkage up or down the th readed stud.
19