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 TM 9-2320-312-24-1
THEORY OF OPERATION - CONTINUED
0003 00
FIFTH WHEEL SYSTEM - CONTINUED
2.
The fifth wheel hydraulic system consists of:
a.
hydraulic pump mounted to transmission-driven PTO;
b.
hydraulic reservoir (same as for the steering system);
c.
two hydraulic cylinders mounted between vehicle frame and fifth wheel frame sub-assembly; and
d.
instrument panel-mounted control valve and lever to raise and lower the fifth wheel from inside the cab.
FIFTH WHEEL
LIFT CONTROL
LOAD
SENSING
GAUGE
FIFTH WHEEL
LOCK CONTROL
3.
The fifth wheel/kingpin coupling is unlocked from inside the cab using an air-operated control lever on the instru-
ment panel.
4.
A load sensing gauge (liquid-filled) on the instrument panel indicates kingpin weight of trailer on fifth wheel.
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