TB 9-2320-279-13&P-4
OPERATOR MAINTENANCE
FIFTH WHEEL CONTROLS
CONTROLS AND INDICATORS INTRODUCTION
This section displays the location and describes the use of Fifth Wheel Controls which are used in the operation of
HEMTT series vehicles. Controls and indicators described in this section are the same for all vehicles, except where
otherwise indicated.
LOCATION AND USE OF CONTROLS AND INDICATORS
Know the location and proper use of every control and indicator before operating HEMTT series vehicles (refer to
TM 9-2320-279-10-1). Separate illustrations with keys are provided for learning about Fifth Wheel Controls.
Table 1. Fifth Wheel Controls.
Key
Control/Indicator
Function
1
2
3
Figure 1.
1
Primary Lock Re-
Pull out (push up and hook tab to lock) to open fifth wheel coupler jaws. Push
lease
in to close fifth wheel coupler jaws. Primary lock release will not function when
secondary lock release is locked.
2
Secondary Lock Re-
Pull out to unlock fifth wheel coupler jaws. Allows primary lock release to open/
lease
close fifth wheel coupler jaws.