Chevrolet 10 Series 1968, Service Manual

Page: 216 / 713

REAR SUSPENSION AND DRIVE LINE 4-47
DRIVE LINE
REAR AXLE (EATON) TWO-SPEED
INDEX
Page
Page
General D e s c r ip t io n
...........................
..................................
4 - 4 7 A xle Vent R eplacem ent.......................................
.......................
4 - 4 9
Maintenance and A d ju s tm e n ts ....................... ..................................
4 - 4 7
Axle Shaft Rem oval and Installation ................
.......................
4 - 4 9
Component P a rt R e p la c e m e n t....................... ..................................
4 - 4 7
Hub and Drum .......................................................
.......................
4 - 4 9
A xle A s s e m b l y
...............................
..................................
4 - 4 7 Piston A ir Shift S y s t e m
......................... .........
4 - 4 9
R e m o v a l....................................................... ..................................
4 - 4 7 D rive Pinion O il S e a l .......................................
.......................
4 - 5 2
..................................
4 - 4 7
GENERAL DESCRIPTION
Eaton two-speed axles are available on all 60 Series
trucks in capacities of 18,500 and 23,000 lb. and in three
Models 17201, 17221 (18,500) and 19201 (23,000).
A ll Models are equipped with a spiral bevel ring
gear and pinion. The two 18,500 lb. axles are the same
except for a larger drive gear diameter on the 17221
Model.
The 23,000 lb. axle is similar in construction to the
18,500 lb. shown in Figure 92 but many components are
of increased size to obtain the greater capacity rating.
Service operations outlined in this section will be
applicable to both the 18,500 and 23,000 lb. axles, the
only exception being the shifting systems. The 18,500 lb.
axle use an electric power shifting arrangement which is
covered in "R ear Axle (Chevrolet) Two-Speed Electric
Shift System ". The 23,000 lb. axle incorporates a Piston
A ir Shift which is covered in this section.
An improved lubrication system (fig. 93) has a steel
reinforced nitrite scraper mounted to the inside of the
carrier. This scraper is positioned to collect oil from
the surface of the rotating gear support case. Oil is
channeled to the right-hand differential bearing, through
the differential and planetary unit to the left-hand dif­
ferential bearing and back to the reservoir.
MAINTENANCE AND ADJUSTMENTS
Maintenance and adjustments for the Eaton Two-Speed Chevrolet Single-Speed axle. Refer to "R ear Axle (Chev-
axles are performed the same as those outlined for the rolet) Single-Speed."
COMPONENT PART REPLACEMENT
Service operations on the axle may be performed with­
out removing the complete axle assembly from the ve­
hicle. There may be occasions, however, when it will be
necessary to remove the complete assembly as a result
of collision or other damage resulting in distortion of the
axle housing. The following axle assembly removal, is
to be used only when replacement of axle housing is
necessary.
AXLE ASSEMBLY
Rem oval
1. Loosen the rear wheel stud nuts, then raise the rear
of the vehicle enough to remove the load from the
rear springs. Support vehicle with stand jacks under
frame side rails.
2. Disconnect the hydraulic brake hose from the brake
pipe at the rear axle, or, if the truck is equipped with
air brakes, bleed the system, then disconnect the air
brake hose from the rear brake chambers.
3. Remove the axle shift unit.
a. 18,500 lb. Electric Shift; remove the two stud nuts
retaining rear axle electric shift unit and pull
unit from differential carrier. Disconnect the
electric wiring from the shift unit and tape wire
terminals separately,
b. 23,000 lb. A ir Shift system; bleed air from air
system and disconnect air line at cover on shift
unit. Remove the two stud nuts retaining rear
axle shift unit and pull unit from differential
carrier. Tape connections to prevent dirt from
entering system.
4. Remove the two trunnion bearing " U ” bolts from the
pinion flange and split the rear universal joint. Swing
the propeller shaft to one side and tie it to the frame
side rail.
5. Remove the rear spring " U " bolts and roll the axle
assembly out from under the truck. Raise the axle
clear of the floor and remove the wheels.
Installation
1. Install the wheels, then roll the axle assembly into
position under the truck.
2. Attach axle to the rear springs with the " U " bolts.
CHEVROLET TRUCK SERVICE MANUAL