Type B Vital Relays - Alstom

Corrective Maintenance
Table 6–11. Mechanical Test and Adjustment Procedure (Cont.)
Step
Procedure
16 Insert a .010 inch feeler gauge under the armature stop screw to hold the back
contacts open. Using a smaller bar under the bottom of the pusher, gently push
up on the bar to see that the pusher rises slightly, without moving the armature.
While holding the armature in this position, verify that the roller on each heel
spring rests on the bottom of the jaw in the pusher.
17 Adjust the springs, if necessary, so they always open the front contacts in case
of a failure at the bottom end of the pusher.
18 For Microchron II Timer Relays, follow the electronics replacement procedure
provided in Table 6–13, and then continue with Step 19.
For all other relays, place the cover on the relay. Verify that the gasket in the
base groove is seated properly and then assemble the two gasket washers over
the relay support tubes. Install and tighten the knurled nuts and apply the seal.
19 Check the contact prong spacing on the back of the relay with the appropriate
gauges: P/N 56260-008-01 and P/N 56260-010-01.
20 Follow the electrical test procedure for the relay, provided in Section 4.
P1457, Rev. Nov/07 6–22 Alstom Signaling Inc.