SECTION 7-Breaker Maintenance (Cont.)
7 . 1 4. 1
B U FFER ADJ USTME NT
Referring to !=ig. 40, with the breaker c losed and the
mechanism not reset, a . 005 " c learance must exist be
tween the end p late assembly and the buffer nut as shown.
Th is dimension is factory set. It can be reset by t ightening
the buffer nut. Hold the nut with a screwdriver and t ig hten
using a socket on the bolt head opposite the nut. When
tighten ing this assem b ly don't over compress the neo
prene washers by overt ig htening the assem bly. These
washers absorb the breaker opening shock.
Referring to Fig. 41 , with the breaker open, a .040 "
max i m u m c l earance can exist between either of the end
p l ate assem b l i es and the buffer bolt heads as shown. If
a larger c learance exists, c lose it u p by unscrewing the
buffer assembly i nvolved.
Fig. 42 shows a buffer assembly prior to being installed
in a breaker. The dimensions given establish the nu mber of
spacers that are used.
7. 1 5
TRIP LATCH ADJ USTMENT
The reset position of the trip latch is set by the adjust
ment screw shown in Fig. 43. The adj ustment is correct if
three and one-half turns of the adj ustment screw causes a
closed breaker to trip. If this check is made, the screw m ust
then be set back, or unscrewed, t t\ ree and one- half turns.
32
FIG. 43 - TRIP LATCH ADJ USTMENT
NEOPRENE WAS H E RS
FIG. 42
B U FF E R ASSEMBL
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