Installation; Bearing Adjustment; Drive Pinion Oil Seal; Replacement - Chevrolet 30 Series 1967 Service Manual

REAR SUSPENSION AND DRIVE LINE 4-34

Installation

1. On the 15,000 lb. axle with 4 inch brake, install inner
bearing oil seal in the inner bearing race and posi­
tion bearing race on axle housing.
2. Using a smooth cup grease, liberally pack bearings
and apply a light coat of I.D. of hub bearing contact
surface on O.D. of axle housing tube.
3. Make sure inner bearing, oil seal, oil seal sleeve,
axle housing oil deflector, and inner bearing race and
oil seal are properly positioned.
4. Install hub and drum assembly on axle housing, exer­
cising care so as not to damage oil seal or dislocate
other internal components.
5. On the 11,000, 13,500, 15,000 with 15 x 4 inch brake,
and 17,000 lb. (single-speed) axles, place outer bear­
ing cone and roller assembly on axle housing and
press firmly into hub with hand (fig. 70).
. On 5200 through 15,000 lb. with 4 inch brake axles,
6
install thrust washer so that tang on I.D. of washer
is in keyway on axle housing.
7. Install adjusting nut and complete the installation as
directed under "Bearing Adjustment."

Bearing Adjustment

Before checking bearing adjustment, make sure brakes
are fully released and do not drag.
Check bearing play by grasping tire at top and pulling
back and forth, or by using a pry bar under tire. If bear­
ings are properly adjusted, movement of brake drum in
relation to brake flange plate will be barely noticeable
and wheel will turn freely. If movement is excessive,
adjust bearings as follows:
1. Remove axle shaft and raise vehicle until wheel is
free to rotate.
2. Disengage tang of nut lock from lock nut and remove
them from axle housing tube.
3. Using appropriate tool, tighten the adjusting nut to
specifications, at the same time rotating hub to make
sure that all bearing surfaces are properly seated
(fig. 71).
a. J-2222-5200 and 7200 lb. axles. (Tighten adjust­
ing nut to 55 ft. lbs. torque, then back off nut 1/8
turn to align nearest slot with short tang on nut
lock.)
b. J-0870-11,000 and 13,500 lb. axle. (Tighten ad­
justing nut to 90 ft. lbs. torque, then back off nut
turn to align nearest slot with short tang on
1 / 8
nut lock.)
F ig . 71 - Tightening W heel Hub Bearing Adjusting Nut (Typ ical)
c. J-22343-15,000 lb. axle with 15 x 5 inch brake
M50 trailing axle (single-speed)
M50 trailing axle (two-speed)
15.000 lb. two-speed axle
17.000 lb. two-speed axle
(Tighten adjusting nut to approximately
50 ft. lbs. torque, then back off nut 1/8
to 1/4 turn to align nearest slot with
short tang of nut lock.)
d. J - 7341-17,000 lb. axle. (Tighten adjusting nut to
65 ft. lbs. torque, then back off nut 1/16 to 1/4
turn to align slot with short tang on nut lock.)
4. Install the nut lock (align nut so that a tang of the nut
lock will engage nearest flat or slot of nut).
5. Make sure wheel turns freely, then install lock nut
and tighten to specifications. Bend tang of nut lock
over flat or slot of lock nut.
a. 5200 and 7200 lb. axles - Tighten lock nut to 175
ft. lbs. torque.
b. 11,000 and 15,000 lb. axle with 15 x 4 inch brake-
Tighten lock nut to a minimum of 250 ft. lbs.
torque.
c. Tighten lock nut to approximately 135 ft. lbs.
torque on the 13,500 lb. axle.
d. Tighten lock nut to approximately 135 ft. lbs.
torque on: 15,000 lb. axle with 1 5 x 5 inch brake.
M50 trailing axle (single speed)
M50 trailing axle (two-speed)
15.000 lb. two-speed axle
17.000 lb. two-speed axle
e. 17,000 lb. axles - Tighten lock nut to 135 ft. lbs.
torque.
. Lower vehicle to floor and install axle shaft.
6
DRIVE PINION OIL SEAL (Figure 72)

Replacement

NOTE: The pinion oil seal may be replaced
with the carrier assembly installed in the
vehicle.
1. Disconnect propeller shaft and remove pinion flange
and deflector.
2. Remove bolts retaining the oil seal retainer to ca r­
rie r, and withdraw retainer from pinion.
3. Pry old seal from bore, using care so as not to dam­
age machined surface of retainer.
4. Thoroughly clean all foreign matter from seal con­
tact area in retainer.
5. Pack the cavity between the seal lips with a high-
melting point bearing lubricant, position seal on
installer Tool J - 22281 so that seal shoulders against
installer drive surface.
. P ress seal into retainer until it bottoms against
6
shoulder.
7. Carefully position seal retainer over pinion to pre­
vent damage to seal, and torque retaining bolts to
specifications.
. Reinstall pinion flange and propeller shaft.
8

NO-SPIN DIFFERENTIAL UNIT

The optionally available No-Spin differential unit is in­
stalled in a conventional 5200 or 7200 lb. rear axle hous­
ing. Service procedures are the same as conventional
CHEVROLET TRUCK SERVICE M ANUAL