TM 5-3805-262-34
3-12. AIR BRAKE SYSTEM MAINTENANCE (CONT)
c. Pressure Protection Valve (Cont).
REASSEMBLY
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
Lubricate piston (11), body (12) bore, new O-rings (4 and 10), and valve
(5) using silicone lubricant.
Install valve stem (9) in piston (11).
Install new O-ring (10) on plug (8).
Install plug (8) in piston (11). Push plug into piston until plug is ful-
ly seated in piston.
Put drive pin punch with flat point in vise. End of punch must be small
enough to fit inside small end of piston (11).
Put piston (11) over drive pin punch mounted in vise.
Install spring (7) on piston (11).
Install guide (6) on spring (7).
Push down on guide (6) to compress spring (7) until valve stem (9) tip
protrudes beyond spring. Install valve (5) on valve stem. Make sure valve
is fully seated on valve stem.
Release guide (6) and remove assembled piston (11) from drive pin punch.
Install new O-ring (4) on piston (11).
Remove drive pin punch from vise and install body (12) in vise.
Install piston assembly (5 thru 11) in body (12).
Install spring (3) in piston (11).
Install nut (2) on body (12) and turn nut clockwise until positioned at
bottom of body threads.
Install cap (1) on body (12) and turn same number of turns as recorded
during disassembly. Be sure match marks are alined.
Adjust pressure protection valve (page 3-458).
3-456
