TM-9-2320-273-10
TRUCK, TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER
TECHNICAL MANUAL; OPERATOR’S MANUAL
DECEMBER 2012
TM-9-2320-273-10 - Page 90 of 452
POWER TRAIN FUNCTION
The power train is the mechanism by which power is transmitted from the engine to
the drive wheels. The power train is mounted to a channel type frame, and together
they make up the chassis. The vehicle power train consists of a diesel engine and
automatic transmission connected to two rear tandem axles. The engine and
transmission transmit power to the forward-rear axle through a transfer case (if
equipped) and a propeller shaft. An inter-axle propeller shaft connects the forward-rear
axle to the rear-rear axle. The front axle of the M915 and M915A1 is a non-driving
axle as indicated by its 6 x 4 drive designation. The front axle of the M916 through
M920 is a driving front axle indicated by the 8 x 6 or 6 x 6 drive designations. The
front driving axle is driven by a propeller shaft from the transfer case. The M917,
M919, and M920 are equipped with pusher axles located in front of the rear driving
tandem axles. The pusher axles are non-driving axles used to help distribute the weight
of loads carried on the vehicle across three axles instead of two. The pusher axles are
connected to the chassis by swing arms and air bags. The pusher axle is raised and
lowered using the pusher axle controls in the cab to adjust the amount of weight
carried by the pusher axle.
Figure 1. Power Train.
REAR-REAR
AXLE
INTER-AXLE
PROPELLER SHAFT
FORWARD-REAR
AXLE
PUSHER AXLE
PRIMARY
PROPELLER
SHAFT
FRONT AXLE
DIESEL ENGINE
TM 9-2320-273-10
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