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7. Check to ensure that the operating arms swing freely without any tendency to
bind.
3.7.3.2. Operating Arms Installation Procedure
1. Check Operating Arms to see that warpage does not exceed 0.010". Discard
any that are warped greater than 0.010".
2. Assemble the operating pins and bushings and push them into the clips on the
heel contact springs. The lower clips should have moderate tension to hold the
bushings in place once they are assembled.
3. Adjust the heel spring clips with a pair of pliers as shown in Figure 3-2 and
Figure 3-3. All bushings should be positioned with the flanges against the heel
clips.
4. Bend the heel spring supporting members sideways using alignment tool
J397164-0020, as shown in Figure 3-4, so that there is clearance of not less
than 0.005" nor more than 0.055" to each contact bushing. Note: Take up the
side play of the operating arm in either direction before they are bent. The jaw of
the tool should be applied over the portion of the supporting member where it is
riveted to the contact spring.
5. Check to be sure that all split pins in the operating arm connections are properly
spread.
Copyright 2019
Figure 3-2. Adjustment of Heel Spring Clips
SM 4574F, Rev. 4, March 2019
PV-250 Track Relay
3-12
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