Section Vlll REAR AXLE
Two similar rear axle assemblies are used in the M915 thru M920 vehicles. The Model M915 uses one
type; the Models M916 thru M920 use a different assembly. (Specifications for both axles are given
in para 1-11.)
2-21. REAR AXLE (M915).
HUB AND DRUM ASSEMBLY. Serves as mount for rear wheels. Houses the brake shoe
assemblies which can be mechanically forced against it to slow or stop the vehicle.
AXLE SHAFT. Transmits power from the differential gear assembly to the hub assembly
inside of axle housing.
INTER-AXLE PROPELLER SHAFT. Transmits power to rear axle.
DIFFERENTIAL LOCKUP CHAMBER. Air actuated by lockup switch located in cab
interior. (Refer to para 2-14 for description.)
BRAKE AIR CHAMBER. (Refer to para 2-64 for description.)
PINION YOKE. Connects to propeller shaft from transmission.
OIL FILTER. Oil filter (under cover) removes impurities from oil in forward rear axle. Filter
is replaceable, automobile-type unit (Refer to LO 9-2320-273-12.)
DRAIN PLUG. Allows draining oil at service intervals.
FILLER PLUG. Used to inspect oil level and replenish oil supply.
BREATHER. Allows fumes from hot oil to escape.