Chevrolet 1980 Light Duty Truck Service Manual page 317

PROPELLER SHAFT
The rear universal joint to propshaft bolt on some CK
1 ton dual wheel models requires a # 10 "Six Lobed Socket"
(J-25085), for proper removal and installation. 34 N 'm,
(Torque to 25 lbs. ft.).
Removal
1. Raise vehicle on hoist. Mark relationship of shaft
to companion flange and disconnect the rear universal joint
by removing trummion bearing "U" bolts or straps. Tape
bearing cups to trunnion to prevent dropping and loss of
bearing rollers.
2. For models with two-piece shafts remove bolts
retaining bearing support to hanger.
3. Slide propeller shaft forward disengaging trunnion
from axle flange, then slide assembly rearward disengaging
from transmission.
For models using strap or U-bolt attachments to
transmission or transfer case use same removal procedure
as above.
Universal Joints
On models with between center slip propshaft it is
important that components
dissassembly for proper phasing. Arrows are stamped on
assemblies as shown in Fig. 4A-7.
The universal joints are of the extended-life design and
do not require periodic inspection or lubrication; however,
when these joints are disassembled, repack bearings and
lubricate reservoir at end of trunnions with high-melting
point wheel bearing lubricant. Use care not to damage or
dislodge seals from trunnion.
Snap Ring Type
Disassembly
1. Remove bearing lock rings from trunnion yoke.
2. Support trunnion yoke on a piece of 31.75 mm (1 -1 /
4") I.D. pipe on an arbor bed.
Fig. 4 A -6 -S tra p A ttach m en t
UNIT REPAIR
are marked prior to
PROPELLER SHAFT
Due to length of the propeller shaft it may be more
convenient to use a bench vise, for removal and installation,
instead of an arbor press. In this case, proceed with
disassembly and assembly procedure as with an arbor press
Fig. 4A-8 and 4A-9.
3. Using a suitable socket or rod, press on trunnion
until bearing cup is almost out. Grasp cup in vise and work
cup out of yoke. See figures 4A-8 and 4A-9. The bearing
cup cannot be fully pressed out.
4. Press trunnion in opposite direction and remove
other cup as in Step 3.
5. Clean and inspect dust seals, bearing rollers, and
trunnion. Relubricate bearings as indicated in Section 0.
In addition to packing the bearings, make sure that the
lubricant reservoir at the end of each trunnion is completely
filled with lubricant. In filling these reservoirs, pack
lubricant into the hole so as to fill from the bottom (use of
squeeze bottle is recommended). This will prevent air
pockets and ensure an adequate supply of lubricant.
Reassembly Fig. 4 A -10
1. Position trunnion into yoke. Paritally install one
bearing cup into yoke. Start trunnion into bearing cup.
Partially install other cup. Align trunnion into cup, and
press cups into yoke.
2. Install lock rings.
Fig. 4 A -7~ P ro p er A lignm ent
4A-5
LIG H T T R U C K S ER V IC E M ANUAL