Type B Vital Relays - Alstom

Corrective Maintenance
6.2. CORRECTIVE MAINTENANCE TOOLS
See Appendix C for a summary of B relay tools.
The Shop Test Rack, P/N 56573-002-01, is used to test relays in the shop. See
Appendix C for details about the Shop Test Rack.
6.3. REMOVAL AND REPLACEMENT PROCEDURES
6.3.1. B Relay Removal and Replacement
Table 6–2. B Relay Removal and Replacement Procedure
Step
Procedure
1 To remove the B relay, loosen and remove two lock nuts from two guide rods.
LOCK NUTS
GUIDE RODS
KNURLED
NUTS
2 Loosen and remove two knurled nuts from two guide rods.
3 Grasping relay top and bottom with both hands, rock slightly from side to side to
release the relay from plug connection. Remove relay.
If an adjacent relay prohibits grasping the relay on top and bottom, use handle
on front to pull relay along guide rods.
P1457, Rev. Nov/07 6–2 Alstom Signaling Inc.