AIR CONDITIONING SYSTEM (ALL EXCEPT M915A2 AND
The air conditioning unit is part of the heater and is mounted under
the glove compartment. It is a single unit consisting of heater core, air conditioning
evaporator coil, blower motor, control valves, and air ducts.
The system is turned on by the mode control lever and the four-
speed blower switch, which also controls flow rate.
An even cab temperature is maintained by controlling the coolant
flow through the heater core, or refrigerant flow through the evaporator coil.
CENTRAL TIRE INFLATION SYSTEM (CTIS) (M917A1 AND
The operator uses CTIS to regulate tire pressure at all wheels. This
allows operation of the dump truck on all road surfaces and across a wide variety of
terrain, including off-road, when the vehicle is stuck due to extreme conditions (ice,
snow, mud), and when a tire has a slow leak due to a minor puncture or other dam-
CTIS uses air from the vehicle air system (paragraph 1-19). Air is
routed to the wheels via a dedicated pneumatic system plumbed from the vehicles
An Electronic Control Unit (ECU) is mounted to the shift tower inside
the cab. An operator selector panel is built into the ECU, allowing operator entry of