1-24. TRANSMISSION AND DRIVE SHAFTS (CONT)
6. CENTER DRIVE SHAFT.
Connected between transmission output shaft and front drive
shaft. Connection accomplished by universal joints.
7. REAR DRIVE SHAFT.
Connected between transmission output shaft and rear axle by
u n i v e r s a l j o i n t s.
1-25. AXLE AND WHEELS
1. FRONT AND REAR AXLES. Double
reduction type driven by propeller
s h a f t s . F i r s t g e a r r e d u c t i on
o c c u r s i n d i f f e r e n t i a l c a r r i e r,
second gear reduction occurs in
planetary wheel ends. Front axle
is rigidly mounted; rear axle is
trunnion mounted. Axles include
d i f f e r e n t i a l c a r r i e r , p l a n e t a r y
and disk type brakes on each
2. DIFFERENTIAL CARRIER.
I n t e g r al
part of axle; single reduction
unit employs a heavy duty spiral
3. PLANETARY ENDS.
I n t e g r a l p a r t o f a x l e . Second reduction employs planetary spur
gears. Power transmitted by differential carrier to axle shafts drives the sun gear.
Sun gear drives planet spur gears which drive the planetary spider and in turn the
4. RIMS AND TIRES.
Heavy duty steel rims; pneumatic tires 20.5 by 25, tubeless.
1-26. BRAKES (See figure FO-l.)
PARKING BRAKE SYSTEM.
Consists of parking brake valve mounted on right instrument
panel, air operated parking brake actuator, and parking brake assembly mounted on
transmission output shaft. Refer to page 1-26 for a description of parking brake
system operation .
SERVICE BRAKE SYSTEM.
Consists of hydraulic brake system and pneumatic system; op-
eration described below.
HYDRAULIC BRAKE SYSTEM.
Consists of brake calipers mounted on each wheel end and
two hydraulic brake reservoirs and two brake actuators, one for front wheels and one
for rear wheels. Service brake treadle and valve controls the flow of air to both
brake actuators. Each actuator has an air chamber and a hydraulic master cylinder.
Air pressure from brake treadle and valve flows to air chamber, pushing diaphragm
and push rod. This action pushes piston in master cylinder. Hydraulic pressure
increases in brake lines forcing brake caliper piston outward and brake pads in
brake calipers are applied to rotors mounted on axle wheel ends.