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MOVING CONTACTS
Minor pitting can be smoothed with crocus cloth. If contacts
show appreciable wear due to arc erosion, replace as follows:
1. Remove the round head screws and lockwashers that
secure the moving contact bar to the contact arm. Remove
the bar from the contact arm.
2. Reassemble the new moving contact bar to the contact arm
and secure with round head screws and lockwashers.
Apply one drop of Loctite #242 to each threaded hole of
the contact bar prior to assembly.
STATIONARY CONTACTS
Smooth minor pitting with crocus cloth. If contacts are
excessively eroded, replace as follows:
1. Remove hex nut, lockwasher and flatwasher from contact
stud. Loosen nut on bushing rod slightly and slip terminal
lead from contact stud.
2. Open flexible contact leads and remove contact retainer.
Pull the stationary contact assembly and contact roller
from contact stud.
3. Install contact roller within new contact assembly and
mount on the contact stud. Install following parts in order:
contact retainer, flexible contact leads, terminal leads, flat-
washer, lockwasher and hex nut. Tighten hex nut on bush-
ing rod.
CAUTION:
Be sure not to pull contacts or contact
structure out of alignment when tightening the jumper
lead to the bushing terminal rod. To test alignment, wet the
contacts with oil. Then, with the actuator mechanism pre-
pared for a closing operation, push the contacts closed by
hand and hold for a few seconds. When the moving contacts
are released, they should be pulled open by the spring in the
head mechanism. If not, adjust stationary contacts as
described in Step 4 until they do so.
4. With the moving contacts in the open position, the space
between the stationary contacts should measure 0.281 +
0.010 inch.
NOTE: The stationary contact assembly is normally pre-adjusted
during manufacture to obtain this clearance. Bend the contact fin-
gers as required if this spacing is not within specified tolerances.
Figure 10.
Removing moving contact.
Figure 11.
Removing stationary contact.
S260-20-8
88956KMA
89997KMA
7
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