Chevrolet 10 Series 1967, Service Manual

Page: 153 / 605

FRONT SUSPENSION 3-25
mission output spline and transfer case input spline are
identical. To summarize, the transfer case adapters
differ in their splined sleeves and mounting faces only.
FREE-WHEELING HUBS
Free-wheeling hubs are available for the front wheels
of four wheel drive vehicles. The purpose of these hubs
is to reduce friction and wear by disengaging the front
axle shafts, differential and drive line from the front
wheels when the vehicle is operated under conditions
where front wheel drive is not needed.
The engagement and disengagement of free-wheeling
hubs is a manual operation which must be performed at
each front wheel. The transfer case control lever must
be in
2
-wheel drive position when locking or unlocking
hubs. Both hubs must be in the fully locked or fully
unlocked position. They must not be in the free-wheeling
position when low all wheel drive is used as the additional
torque output in this position can subject the rear axle to
severe strain and rear axle failure may result.
POWER TAKE-OFF
Provision is made for mounting a shaft type Power
Take-Off at the rear of the transfer case input shaft.
OTHER COMPONENTS
The rear axle assembly, including service brakes, is
identical to the axle used on conventional drive models.
The parking brake operates by mechanical activation of
the service brake shoes in the rear wheels through a
pistol-grip type parking brake lever mounted under the
left side of the instrument panel.
[ADAPTER1
ITRANSFER;
ICASE
Fig . 1 - Control Lever Fig . 2 - Transfer Case and Adapter Assembly
MAINTENANCE AND ADJUSTMENTS
KING PIN TRUNNION
Front axle trunnion bearing adjustment is necessary
only when there is excessive play in steering, irregular
wear on tires or persistent loosening of the tie rod.
1. Raise front end of truck so both front wheels are off
the ground and place jack stands behind front springs.
Disconnect connecting rod and tie rod to allow inde­
pendent movement of each steering knuckle.
Apply torque wrench to bearing retainer bolt and
check torque necessary to turn the steering knuckle.
The knuckle should turn easily but have no play with
120-180 in. lbs. torque.
2
.
3.
4. If torque is too low, remove the bearing retainer and
remove shims up to .005" (fig.
6
).
5. Reinstall retainer, tighten bolts to 30-40 ft. lbs.
torque and recheck torque necessary to turn the
knuckle.
6
. If there is still excessive play, repeat Steps 3, 4,
and 5.
NOTE: Do not remove shims in excess of
.010". If there is still excessive play after re ­
moving .
0 1 0
" shim, the steering knuckle should
be disassembled and inspected as outlined under
"Service Operations."
COMPONENT PARTS REPLACEMENT
FREE WHEELING HUB
The free wheeling hub assembly used on the front
wheels is serviceable. Service operations are as follows:
Removal From Wheel Hub
1. Turn hub key to set
position (fig. 3).
hub to "free" or "disengage"
CHEVROLET TRUCK SERVICE M ANUAL