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39
IB-65100
Maintenance
To adjust the pawl perform the following
steps:
1. Remove the escutcheon to gain access
to the head of the bolt holding the
adjusting eccentric.
2. Loosen the bolt slightly.
3. Grip the eccentric with a pair of slip-
joint pliers or a similar tool and rotate
the stop slightly.
4. Tighten the holding bolt with the
eccentric in the new position.
5. While charging the main closing
springs, using the charging motor to
drive the mechanism, observe the
ratcheting operation for improvement.
6. If the ratcheting operation has not
improved, repeat the preceding
sequence until the ratcheting operation
is smooth. This may require several
charging cycles.
7. When the eccentric is properly set
replace the escutcheon.
Be sure that the escutcheon is reinstalled
on the proper circuit breaker, since the
escutcheon contains the nameplate with
the circuit breaker’s rating and serial
number information. The serial number
of the circuit breaker is also attached to
the circuit breaker frame near the ground
connection on a stamped metal plate. The
serial number found on the nameplate
must match the number affixed to the
frame.
b. Adjustment of Primary Trip Prop
Figure 20
Primary & Secondary Trip Prop
Adjustment
Sight Line
b
c
d
e
f
0.005-0.015"
a
a. Secondary Trip Prop
b. Primary Trip Prop Roller
c. Primary Trip Prop
d. Primary Trip Prop Adjusting Screw
e. Rivet
f. Trip
Bar
Perform the following procedures to adjust
the primary trip prop:
1. Remove the main closing spring. Refer
to
Ch 5 Maintenance,
B. M
ECHANISM
A
REA
.
Adjust the primary trip prop adjusting
screw (Figure 20, d) so that with the
fundamental linkage in the reset
position, the clearance between
the primary trip prop roller and the
secondary trip prop is 0.005” to 0.015”.
The primary trip prop adjusting screw
is accessible from the rear of the stored
energy mechanism and is located
inside the hole beside the lower middle
insulator supporting the live part
assembly.
2. Replace the main closing spring.