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Page Title:
FIFTH WHEEL JAWS DON'T OPEN (Con t) |
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 TM 9-2320-285-24-2
3-30.
FIFTH WHEEL TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
FIFTH WHEEL JAWS DON'T OPEN (Con t)
Step 4.
Start vehicle engine and operate at 1200 rpm to build up air system pressure; then check indication on
AIR PRESS gage.
a.
If AIR PRESS gage indicates less than 100 psi, troubleshoot air system (refer to para 2-47 or 2-48).
b.
If AIR PRESS gage indicates at least 100 psi, proceed to step 5 below.
WARNING
Wear safety glasses and stand clear when loosening air system fittings. High pressure air can propel
debris at high speed, causing eye injury or blindness.
Step 5.
Loosen hose connector at fitting on fifth wheel unlatch cylinder (para 3-33a).
Have assistant depress brake pedal and momentarily press FIFTH WHEEL UNLATCH CONTROL;
listen for air discharge from loosened hose connector.
a.
If air discharges from loosened hose connector, replace fifth wheel unlatch cylinder (para 3-33a).
b.
If air does not discharge from loosened hose connector, proceed to step 6 below.
WARNING
Wear safety glasses and stand clear when loosening air system fittings. High pressure air can propel
debris at high speed, causing eye injury or blindness.
Step 6.
Loosen elbow at fifth wheel unlatch valve (para 3-33b). Have assistant depress brake pedal; listen for air
discharge from loosened elbow.
a.
If air discharges from loosened elbow, repair fifth wheel unlatch valve (para 3-33b).
b.
air does not discharge from loosened elbow, troubleshoot air system at brake treadle valve (para 2-47
3-296
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