Chevrolet 70 1969 Series, Руководство по ремонту

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REAR AXLE 4-10
Figure 17 — C h e c k in g Differential B e a r in g Pre-Load
assembly in carrier housing (fig. 5).
2. Slide bearing adjusters (8 and 27) into place on car­
rier. T hread adjusters hand-tight against bearing cups.
Install bearing caps in original positions according to
m arks m ade at disassembly (fig. 4). N O T E : Som e
axles use dowels (4) between left cap and carrier.
C A U T IO N : I f b e a rin g caps do not se a t p ro p e rly , a d ­
ju ste rs m a y b e cro ss-th re a d e d . R e m o v e cap s a n d re p o ­
sition a d ju ste rs. Do not fo rce into p o sitio n or th re a d s
w ill b e d a m a g e d .
3. Install bearing cap screws (2). Tighten snugly; thei.
back off only enough to perm it turning adjusters.
4. Tighten adjusters alternately until all play has been
elim inated. Revolve assem bly after each tightening
step to prevent bearing cups becoming cocked. A fter
all play has been removed from side bearings, tighten
each adjuster one notch. M ake certain both adjusters
are positioned to perm it locks (6) to engage adjusters.
W hen com pletely assembled, there should be backlash
between drive gear and pinion, and no high spots
should be felt when differential assembly is revolved.
2. Position pinion and cage assembly over carrier and
housing bolt holes. Be sure oil passages in shims and
cage index with similar passages in carrier.
NOTE: A straight dowol pin in cage indexes
with hole in carrier.
3. Install cap screws and lock washers. Tighten 9 /1 6
inch cap screws to 115-125 foot-pounds or 5/8 inch
cap screws to 160-175 foot-pounds torque.
IMPORTANT: If the gauge method is to be used
to determine pinion cage shim pack thickness,
the gauging operation should be accomplished
at this stage of assembly. Refer to "Gear Back­
lash and Tooth Contact" later in this publica­
tion.
If gauge method is net to be used, continue
with assembly operations as described in fol­
lowing paragraphs:
DIFFERENTIAL INSTALLATION
1. Lubricate side bearings and cups with recom m ended
axle lubricant. Place cups over bearings and position
DIFFERENTIAL BEARING
PRELOAD ADJUSTMENT
1. Using dial indicator at back face of drive gear as
shown in Figure 17, loosen bearing adjuster on flanged
side until end play can be noticed on indicator.
2. Tighten the same adjuster until 0.000 inches end play
is obtained.
3. Check drive gear run-out. If run-out exceeds 0.008
inches remove differential assem bly and check for
cause.
4. Tighten each adjuster one notch from 0.000 inches
end play position, to place correct preload on differ­
ential bearings.
NOTE
After bearing preload has been adjusted,
proceed with tooth contact and backlash ad­
justment before completing the next two steps:
5. Tighten bearing cap screws to torque as follows:
11/16 inches .................................................210-250 F oot-Pounds
3/4 in c h es.......................................................300-340 F oot-Pounds
13/16 inches .................................................350-425 F oot-Pounds
6. Install lock wires.
GENERAL REAR AXLE INFORMATION
G E A R TOOTH C O N T A C T A N D BACKLASH
M ethod of adjusting pinion and bevel gear to obtain
proper gear tooth contact and backlash varies, depending
upon type of axle.
Differential carrier assembly should be m ounted in re­
pair stand (J-3409) which facilitates repair and adjustm ent
operations (fig. 3).
Two m ethods of establishing proper gear tooth contact
can be used. One is with the m ethod of using red lead on
gear teeth, the other is with a pinion setting gauge.
W hen using the gauge m ethod, backlash is established
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK SH O P M A N U A L