Chevrolet 70 1969 Series, Руководство по ремонту

Страница: 140 / 913

SECTION 4
REAR SUSPENSION
This section is divided into three sub-sections as shown in index below:
Section Page No.
4A Rear Axle and Controls .................................. 4A-1
4B Rear Springs ................................................... 4B-22
4C Rear Hubs and Bearings .................................. 4C-40
4D Propeller Shafts ............................................... 4D-44
SECTION 4A
REAR AXLE AND CONTROLS
DESCRIPTION
Rear axles used on all vehicles covered by
this publication are full floating type, using Hotch­
kiss, radius rod, or leaf spring drive.
Single axles are usually Hotchkiss and leaf
spring drive, while tandem units are radius rod
drive.
Tandem suspensions are Hendrickson equaliz­
ing beam type with both axles driving, however,
Page and Page suspension is usually used when
only one axle is driving in a tandem suspension.
Rear axles are Hypoid or spiral bevel pinion
and bevel gear type. Pinion is straddle mounted
between roller bearing and two adjustable tapered
roller bearings. Differential is supported by ad­
justable tapered roller bearings mounted in dif­
ferential carrier.
Housing is either banjo or bowl type, with
spring seats and brackets, also brake mounting
brackets welded to housing. This type construction
provides exact alignment and location of axle as­
sembly at time of assembly and installation.
Axle shafts are full-floating type. Inner end of
shaft is splined and engages similar splines in
differential side gear. Outer end of shaft is flanged
and is attached to wheel hub by studs, tapered
dowels, and nuts.
REAR AXLE CONTROLS
Paragraphs following are intended to provide
information relative to several systems used to
shift 2-speed axles into high or low speeds. Infor­
mation is also included on inter-axle differential
lock controls used on forward unit of some tandem
axle units.
TW O- SP EED E L E C T R IC SHIFT
The electric shift control system consists of
a control switch, speedometer adapter, shift units,
and interconnecting wiring harness.
C O N T R O L S W IT C H
The control switch, mounted on transmission
shift lever consists of a shift button which is posi­
tioned by the driver to operate a shift unit at axle.
The driver selects the axle ratio by moving con­
trol button to select L O W and HIGH axle range
(fig. 1). Movement of control button completes
circuit to one field of shift unit motor when in
H IG H and to opposite field when in L O W . Refer to
Section 12.
Figure 1 -T w o-Spe e d Axle Electric Shift Controls
CHEVROLET SERIES 70 -80 H EAVY DUTY TRUCK SH O P M A N U A L