BEARING ADJUSTMENT PROCEDURE
GENERAL RULES ON SERVICING BEARINGS
(1) Take extreme care when removing and installing
bearing cups and cones. Use only an arbor press for
installation, as a hammer may not properly align the
bearing cup or cone. Burrs or nicks on the bearing seat
will give a false end play reading while gauging for
proper shims. Improperly seated bearing cups and
cones are subject to low mileage failure.
(2) Bearing cups and cones should be replaced if they
show signs of pitting or heat distress. If distress is seen
on either the cup or bearing rollers, both cup and cone
must be replaced.
(3) Bearing preload and drag torque specifications
must be maintained to avoid premature bearing
failures. Used (original) bearing may lose up to 50% of
the original drag torque after break-in. All bearing
adjustments must be made with no other compo-
nent interference or gear intermesh.
(4) Replace bearings as a pair. For example, if one
differential bearing is defective, replace both differen-
tial bearings. If one input shaft bearing is defective,
replace both input shaft bearings.
(5) Bearing cones must not be reused if removed.
(6) Turning torque readings should be obtained
while smoothly rotating in either direction (break-
away reading is not indicative of the true turning
torque).
(7) Replace oil baffle, if damaged.
INPUT SHAFT BEARING END PLAY ADJUST-
MENT
(1) Using Tool C-4656 with Handle C-4171, press
input shaft front bearing cup slightly forward in case.
Then, using Tool C-4655 with Handle C-4171, press
bearing cup back into case from the front. Properly
position bearing cup, before checking input shaft end
play (see input shaft front bearing cup replace in
Subassembly Recondition section). This step is
not necessary if Tool C-4655 was previously used
to install input shaft front bearing cup in the
case. Also no input shaft shim has been installed
since pressing cup into case.
(2) Select a gauging shim which will give 0.025 to
0.254mm (.001 to .010 inch) end play. SUGGES-
TION: Measure original shim from input shaft
seal retainer and select a shim 0.254mm (.010
inch) thinner than original for the gauging shim.
(3) Install gauging shim on bearing cup and install
input shaft seal retainer.
CAUTION: The input shaft seal retainer is used to
draw the input shaft front bearing cup the proper
distance into the case bore during this step. Alter-
nately tighten input shaft seal retainer bolts until
input shaft seal retainer is bottomed against case.
Tighten bolts to 28 N
I
m (21 ft. lbs.).
(4) Oil input shaft bearings with SAE 5W-30 engine
oil and install input shaft in case. Install bearing
retainer plate with input shaft rear bearing cup
pressed in and bearing support plate installed. Tighten
all bolts and nuts to 28 N
Im (21 ft. lbs.).
(5) Position dial indicator to check input shaft end
play. Apply moderate load, by hand, to input shaft
splines (Fig. 1). Push toward rear while rotating input
shaft back and forth a number of times to settle out
bearings. Zero dial indicator. Pull input shaft toward
the front while rotating input shaft back and forth a
number of times to settle out bearings. Record end play.
(6) The shim required for proper bearing end play is
the total of the gauging shim thickness, plus end
play, minus (constant) end play of 0.051mm (.002
inch). Combine shims, if necessary, to obtain a shim
within .04mm (.0016 inch) of the required shim (see
Shim Chart for proper shim).
(7) Remove input shaft seal retainer and gauging
shim. Install shim(s) selected in step (6) and reinstall
Fig. 10 Checking Side Gear End Play
Fig. 11 Checking Side Gear End Play
.
TRANSAXLE
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