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TM 9-2330-272-14
4-41.
RELAY VALVE MAINTENANCE.
This Task Covers:
a.
Operating Test
c.
Installation
b.
Removal
Initial Setup:
Equipment Conditions:
Materials/Parts:
l Wheels chocked.
l Marker tags (Item 17, Appendix E)
l Semitrailer coupled to towing vehicle (operating test)
(para 2-10).
l Antiseizing tape (Item 18, Appendix E)
Tools/Test Equipment:
l General mechanic’s tool kit
a. OPERATING TEST
1.
Apply brakes. Check that semitrailer brakes apply properly.
2.
Release brakes and check that air pressure is released through exhaust check valve on relay valve (3).
3.
Charge semitrailer brake system and close emergency shutoff valve on towing vehicle.
4.
Disconnect emergency air coupling and check that semitrailer brakes apply.
5.
Connect emergency air coupling and open emergency shutoff valve on towing vehicle. Check that brakes
release.
b.
REMOVAL
1.
Open draincock (6) on air reservoir (5) and allow all air pressure to release. Close draincock.
2.
Tag three air tubes (2). Remove three air tubes and elbows (1) from relay valve (3).
3.
Tag air tube (7). Remove air tube and straight adapter (8) from relay valve (3).
4.
Remove relay valve (3) from nipple (4) on air reservoir (5).
c.
INSTALLATION
1.
Apply antiseizing tape to threads of nipple (4) on air reservoir (5). Turn relay valve (3) clockwise to install on
nipple.
2.
Apply antiseizing tape to threads of straight adapter (8). Install straight adapter and air tube (7) on relay valve (3).
3.
Apply antiseizing tape to threads of three elbows (1). Install elbows and air tubes (2) on relay valve (3).
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