TM 55-2210-224-34
3-10.
DUPLEX AIR GAGES
This task covers:
a.
Removal
c.
Cleaning
e.
Repair
g.
Assembly
b.
Disassembly
d.
Inspection
f.
Test
h.
Installation
INITIAL SETUP
Tools
Material/Parts
Tool kit SC4940-97-CL-E12
Glass cleaner (Item 4, Appendix B)
Pointer puller
Test Equipment
Portable air gage tester P/N 700-1 (30187)
REMOVAL
NOTE
· Federal Railroad Administration requires annual testing of duplex air gage or when gage is not
operating properly.
· Duplex air gage can be tested while installed in control stand using a self-contained, portable tester.
Refer to step 11 below for testing instructions.
1.
Loosen six thumbscrews (1) and remove front cover (2), two gaskets (3), and gasket (4).
2.
Remove five capscrews (5), cover (6), and gasket (7).
3.
Disconnect two air line connections (8) from duplex air gage (11).
4.
Remove two capscrews (9) and lockwashers (10) and remove duplex air gage (11).
DISASSEMBLY
5.
Pry copper clasp (12) from gage face (13) and remove glass cover (14).
6.
Remove two screws (15) and remove gage face (13) from glass housing (16).
CLEANING, INSPECTION, AND REPAIR
7.
Use glass cleaner and clean glass cover (14) and glass housing (16).
8.
Inspect glass cover (14) and glass housing (16) for cracks or scratches. Replace glass cover or glass housing if
damaged.
9.
Inspect gage face (13) for damage. Replace if components appear damaged.
10.
Repair is limited to the adjustment of pointers. If pointer hands do not set at zero, use pointer puller and remove
pointers. Set pointers at zero.
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