TM 5-4930-244-14
4-50. CONTROL VALVE - REPLACE.
This Task Covers:
a. Removal
b. Installation
Initial Setup:
Tools Required
Tool Kit, General Mechanic's: Automotive (Appendix B, Section III, Item 1).
Materials/Parts Required
Teflon Tape (Appendix E, Section II, Item 7).
Equipment Condition
Unit shut down and cool.
a. Removal. (Refer to Figure 4-50).
(1)
Completely vent trailer air brake system pressure by opening drain valve. (para. 4-51).
(2)
Tag and identify four air brake lines (1).
WARNING
·
Compressed air may cause severe injury or death if not used properly.
Make sure that air pressure in trailer brake system is completely drained
before proceeding.
(3)
Disconnect four air brake lines (1) from parking brake control valve (2).
(4)
Remove three brass male elbows (3) and one brass male adapter (4).
(5)
Tap dowel (5) out from pull knob (6). Remove pull knob (6) from parking brake control valve (2).
(6)
Remove jam nut (7) from top of parking brake control valve (2). Remove parking brake control valve (2) from
bottom of control valve bracket (8).
NOTE
Remove old Teflon Tape from brass air line fittings.
(7)
Inspect parking brake fittings and air lines for damage. Replace as necessary.
b. Installation.
(1)
Slide parking brake control valve (2) up through bottom of control valve bracket (8). Install jam nut (7) onto
threads of parking brake control valve (2).
(2)
Install pull knob (6) onto stem of parking brake control valve (2).
(3)
Tap dowel (5) into stem of parking brake control valve (2).
4-154
