Assembly Of Axle; Pinion Bearing Cup Installation - GMC 1989 Light Duty Truck Repair Manual

4C4-10 K TRUCK FRONT AXLE
Sealing surface of the pinion flange for nicks, burrs,
or rough tool marks which would cause damage to
the seals' inside diameter and result in an oil leak.
Replace all worn or broken parts.
Ring and pinion gears are matched sets and are
both replaced any time a replacement of either is
necessary.
BEARINGS
Inspect
Bearings visually and by feel. The bearings should
feel smooth when oiled and rotated while applying
as much hand pressure as possible.
The large end of the bearing rollers for wear. This is
where tapered roller bearing wear is most evident.
Bearing cups for wear, cracks, b rin e llin g and
scorring.
Bearings and cups are only replaced as sets.
If the axle was operated for an extended period of
time with very loose bearings, the ring gear and
drive pinion will also require replacement.
Low mileage bearings may have minute scratches
and pits on the rollers and the bearing cups from the
initial preload. Do not replace a bearing for this
reason.
Bearing caps for cracks or chips.
Im portant
Apply axle lubricant to all bearings, seal lips, gears,
thrust washers, and bearing surfaces at assembly.
PINION BEARING CUP
INSTALLATION
-► <- Install or C onnect (Figures 1 through 4, 20,
and 21)
Tool Required:
J 36598 Holding Fixture and Pinion Service
Tool
Mount the left carrier case in J 36598. Use the
J 36598-6 adapter plate for K15-25 models. Tighten
the attaching bolts securely.
Outer bearing cup (40). Use the forcing screw and
J 36598-3 (K15-25) or J 36598-4 (K35) (figure 20).
Inner bearing cup (39).
• Remove J 36598-3 or J 36598-4 from the
forcing screw.
• Place pilot J 36598-15 in the pinion seal bore.
• Extend the forcing screw through the pinion
bore.
• Install J 36598-3 (K15-25 models) or J 36598-4
(K35 models) on the forcing screw (figure 21).
SHIMS, THRUST WASHERS AND
ADJUSTER SLEEVES
SHIFT MECHANISM
U
SOLENOID CHECK

ASSEMBLY OF AXLE

Inspect
Shims and thrust washers for cracks and chips.
Damaged shims should be replaced with an equally
sized service shim.
Adjuster sleeves for damaged threads. Replace if
required.
Inspect (Figures 1 through 4)
• Carrier connector (9) (if used) for damaged splines
and teeth. Replace as required.
• Shift fork (17) for wear, scoring, and damage to
thrust surfaces. Replace if needed.
• Sleeve (22) and inner output shaft (23) for damaged
splines and teeth. Replace if necessary.
• Spring (16) for breakage.
• Solenoid (13) and indicator switch (13) for damage
and frayed wiring.
• A p ply 12 volt battery voltage to the solenoid
terminals. The plunger should extend within several
seconds.
• Disconnect the solenoid from the power source. The
plunger should retract within several seconds.
• If the solenoid does not operate as specified, it
should be replaced.
r
40.
B e aring C up
Figure 20— Installing the Outer Pinion Bearing Cup
• Rotate the forcing screw until the installer is
snug against the bearing cup. Rotate the tool
several times to make sure the bearing cup is
not cocked in the bore.
• Pull the bearing cup into place with the forcing
screw (figure 21 ).
F-5867