Chevrolet 10 Series 1968, Service Manual

Page: 222 / 713

REAR SUSPENSION AND DRIVE LINE 4-53
DRIVE LINE
TANDEM AND POWER DIVIDER (EATON)
INDEX
Page
General D e s c r ip t io n ............................................................. ... 4-53
Maintenance and A dju stm en t................................................ ... 4-55
Rearw ard R ear A x l e .......................................................... ... 4-55
Forward R ear A x l e ............................................................. ... 4-55
S ervice O p e r a tio n s .................................................................... 4-55
In te r-A xle D ifferen tial Lock Shift S y s t e m ................... ... 4-55
Vacuum O p e ra ted ............................................................. ... 4-55
O p e r a t io n ....................................................................... ... 4-55
Checking fo r L e a k a g e .......................... ..........................4-55
Solenoid Lock V alve . .
Locking Cylinder . . . .
A ir O p e r a t e d ...................
O p e r a t io n ......................
Checking fo r Leakage .
Control V a l v e ................
A ir Shift Cylinder . . .
D ifferential Lockout
Rem oval and Installation
Page
4-57
4-57
4-57
4-57
4-58
4-58
4-58
4-58
GENERAL DESCRIPTION
The tandem rear axle installation (fig. 100) consists of
a rearward rear axle (Eaton Model 30R) and a forward
rear axle (Eaton Model 30D) which carries a single speed
power divider with an inter-axle differential. An air or
vacuum operated shift mechanism is used to lock out the
inter-axle differential to provide positive drive to both
axles when required.
Drive is transmitted from the transmission through a
conventional propeller shaft to the power divider input
shaft (fig. 101). The input shaft supports the inter-axle
differential which transmits equal driving force to two
helical gears, one mated to a gear on the forward rear
axle pinion shaft to drive the forward axle and the other
mated to a gear on the power divider output shaft to
transmit drive force through an inter-axle propeller
shaft to the rearward axle. Both axles drive at all
times, so the inter-axle differential (3rd differential) is
provided to allow differential action between the two
axles. When extra traction is required to move the ve­
hicle, the inter-axle differential can be locked out so
equal power can be delivered to each axle. A toggle
switch in the driver's compartment actuates the solenoid-
controlled, vacuum operated, lock-out shift lever at the
axle. The air system is controlled by a lever operated
Fig. 100—Tandem Rear A xle s and Power D ivid er
CHEVROLET TRUCK SERVICE MANUAL