TM 9-2320-363-10
2-2.
INSTRUMENT PANEL (Con’t).
Key
Control or Indicator
Function
20
Fifth Wheel Slide
Permits repositioning of sliding fifth wheel from
(M915A2)
inside cab. LOCK position deactivates control
valve and locks fifth wheel to baseplate. UNLOCK
position activates control valve to allow changes to
total length of tractor-trailer and changes to axle
loads.
21
Tachograph
Registers truck ground speed (mph/kph hand),
(M915A2 and
engine speed (rpm hand), and distance traveled
M916A1)
(odometer). Other two hands are clock hands.
With a tachograph disk installed, data is recorded
on a seven-day graph for a permanent record.
22
All-Wheel Drive
Engages and disengages front driving axle based
Control Valve Lever
on changing driving conditions.
(All Except M915A2)
(a) ENGAGE. In poor traction conditions, stop
vehicle and move lever to left position to lock
up driveline and engage front driving axle.
(b) DISENGAGE. When conditions are back to
normal, move lever to right position and let up
on accelerator to disengage.
23
Tailgate Release
Unlocks and locks dump body tailgate (TM 5-3805-
Control Valve Lever
264-14&P).
(M917A1 and
M917A1 w/MCS)
24
PTO Indicator Light
Indicates when PTO is turned on.
(All Except M915A2)
25
PTO Switch
Positions are ON and OFF. Engages PTO.
(All Except M915A2)
26
Parking Brake Control
Yellow diamond-shaped knob operates parking
brake valve. Pull out to apply and push in to
release parking brake.
2-11
