TM 9-2330-384-14&P
4-42. RATIO RELAY VALVE MAINTENANCE (Con't).
(2)
Disconnect two SERVICE air lines (4) from tee (5).
(3)
Disconnect two EMERGENCY air lines (1) from elbows (2).
(4)
Disconnect air line (8) from brake chamber (11).
(5)
Remove air line (8) from underside of ratio relay valve (3).
(6)
Disconnect air line (7) from elbow (6) at underside of ratio relay valve (3).
(7)
Remove ratio relay valve (3) from front air reservoir (12). Remove two plugs from underside
of ratio relay valve.
(8)
Remove three elbows (2 and 6) and tee (5) from ratio relay valve (3).
(9)
inspect three elbows (2 and 6) and tee (5) for cracks or damaged threads. if damaged,
replace.
d. INSTALLATION
WARNING
Ensure that air lines do not rub against each other or any other surfacewhen
installed. Relocate or provide support, as required. if air lines rub, a leak
may develop, resulting in brake lockup and possible serious injury or death
to personnel.
NOTE
Ail male threads of fittings should be coated with antiseize tape if not al-
l
ready factory-coated with an antiseize compound.
install ail air lines and fittings to valve ports as tagged.
l
if connecting air lines after installing air reservoir (10 or 12), perform
steps 3 and 5 through 8.
(1)
install three elbows (2 and 6) and tee (5) to ratio relay valve (3).
(2)
install two plugs to underside of ratio relay valve (3). install ratio relay valve to front air reser-
voir (12).
(3)
Connect air line (7) to elbow (6) at underside of ratio relay valve (3).
(4)
Connect air line (8) to underside of ratio relay valve (3).
(5)
Connect air line (8) to brake chamber (11).
(6)
Connect two EMERGENCY air lines (1) to elbows (2).
(7)
Connect two SERVICE air lines (4) to tee (5).
(8)
Connect tractor EMERGENCY and SERVICE air couplings to semitrailer (see paragraph 2-12).
Fully pressurize semitrailer air system (see TM 9-2320-273-10 or TM 9-2320-283-10).
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