Assembly Of Axle; Pinion Bearing Cup Installation - Chevrolet 1988 Light Duty Truck Repair Manual

Sealing surface of the pinion flange for nicks, burrs,
or rough tool marks which would cause dam age to
the seals' inside diam eter and result in an oil leak.
Replace all worn or broken parts.
Ring and pinion gears are matched sets and are
both replaced any tim e a replacem ent of either is
necessary.
BEARINGS
1?
In sp ect
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.
B e a rin g 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 m ileage 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 p o rtan t
Apply axle lubricant to all bearings, seal lips, gears,
thrust washers, and bearing surfaces at assembly.
PINION BEARING CUP
INSTALLATION
Install or C on n ect (F ig u res 1 th ro u gh 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.
1. Outer bearing cup (40). Use the forcing screw and
J 36598-3 (K15-25) or J 36598-4 (K35) (figure 20).
2. 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 W ASHERS AND
ADJUSTER SLEEVES
SHIFT MECHANISM
• Carrier connector (9) (if used) for dam aged splines
• Shift fork (17) for wear, scoring, and dam age to
• Sleeve (22) and inner output shaft (23) for dam aged
• Spring (16) for breakage.
• Solenoid (13) and indicator switch (13) for dam age
SOLENOID CHECK
• A p p ly 12 volt b a tte ry vo ltag e to th e s o le n o id
• Disconnect the solenoid from the power source. The
• If the solenoid does not operate as specified, it

ASSEMBLY OF AXLE

K TRUCK FRONT AXLE 4C4-9
Inspect
Shim s and thrust washers for cracks and chips.
Damaged shim s should be replaced with an equally
sized service shim.
Adjuster sleeves for damaged threads. Replace if
required.
Inspect (F ig u re s 1 th ro u g h 4)
and teeth. Replace as required.
thrust surfaces. Replace if needed.
splines and teeth. Replace if necessary.
and frayed wiring.
terminals. The plunger should extend w ithin several
seconds.
plunger should retract within several seconds.
should be replaced.
• Rotate the forcing screw until the installer is
snug against the bearing cup. Rotate the tool
several tim es to make sure the bearing cup is
not cocked in the bore.
Pull the bearing cup into place with the forcing
screw (figure 21).