Chevrolet 1977 light duty truck, Service Manual

Page: 305 / 861

COMPONENT REPLACEMENT
HUB REPLACEMENT
CAUTION: See CAUTION on page 1 o f this
section regarding the fasteners in the following
procedures fo r hub replacement.
FREE-W H EELING HUBS
K 10, K 20 (P A R T -T IM E )
Hub Rem oval
1. T u rn actuator lever to set h u b to " L O C K "
position (Fig. 3C-5K) and raise vehicle on hoist.
2. Rem ove six retaining plate bolts and remove
r e ta in in g plate actuating knob and " O " ring.
3. R em o v e in te rn a l s n a p ring, o u te r clutch
re ta in in g ring and actuating cam body.
4. Relieve pressure on the axle shaft snap ring and
remove snap ring.
5. Remove the axle shaft sleeve and clutch ring
assembly and in n e r clutch ring and bushing assembly.
6. Remove pressure spring and spring retainer
plate.
7. Remove the wheel b earin g outer lock nut, lock
ring, an d wheel b earin g in n e r adjusting nut using Tool
J-6893 an d A d a p te r J-23446 or Tool J-6893-01.
N O T E : If the disc or other brake components
require repairs or replacem ent, refer to Section 5.
8. Remove the hub-and-disc assembly, outer wheel
b e a rin g and the spring re ta in e r plate.
a. Remove the oil seal and inner bearing cone
from the hub using a brass drift and tapping with a
h a m m e r. Discard the oil seal.
b. Remove the inner and outer bearing cups
using a brass drift an d ham m er.
c. Clean, inspect and lubricate all parts as
required.
Servicing A ctuating Parts
1. Remove actuator knob and " O " ring from
retaining plate, discard " O " ring and replace with a new
" O " ring during assembly.
2. Slide in n e r clutch ring an d bushing assembly
from axle sleeve and clutch ring assembly.
3. Wash all parts in solvent and air dry.
Inspect all parts for wear, cracks or broken
4.
teeth.
5.
6.
Replace all " O " rings during assembly.
Place new " O " ring seal on actuator knob.
Apply Lubri-plate, o r equivalent, to " O " ring and place
actuator knob in retaining plate.
Installation of Hub
NOTE: All parts should be lubricated for norm al
operation du rin g assembly with an am ple am ount
o f high speed grease. Lubrication M U S T be
applied to prevent deterioration before the unit is
placed in service.
1. Assemble the outer wheel bearing cup into the
wheel hub using Installer J-6368 and D river Handle
J-8092.
2. Assemble the inner wheel bearing cup into the
wheel hub using Installer J-23448 and D river Handle
J-8092.
3. Pack the wheel bearing cone with a high melting
point type wheel bearing grease and insert the cone into
the cup.
4. A fter lubricating the wheel bearings, install the
hub-and-disc an d the bearings to the spindle.
5. Torque the inner adjusting nut to 50 foot
pounds, while rotating the hub-and-disc to seat the
bearings. Use Tool J-6893 and A d ap ter J-23446 or
J-6893-01. Back off the inner adjusting nut and retorque
to 35 ft. lbs. while the hub is being rotated.
6. Back off the inner adjusting nut again 3 /8 turn
maxim um . Assemble the adjusting nut lock by aligning
the nearest hole in lock with the adjusting nut pin. Install
outer lock nut and torque to 50 ft. lbs. (m inim um ).
NO TE: Hub assembly should have .001 to .010
inch end play.
7. Install spring retain er plate (flange side facing
bearing) over spindle nuts and seat retain er against
bearing outer cup.
8. Install pressure spring into position. Large O.D.
seats against spring retain in g plate.
NOTE: Spring is an interference fit. W hen spring
is seated, spring extends past the spindle nuts by
approxim ately 7 /8 " .
9. Place inner clutch ring and bushing assembly