GMC 1986 P-Truck Service Manual page 333

249. Locking Hub Assembly
250. Locking Nut
251. Ring
252. Adjusting Nut
253. Outer Wheel Bearing
254. Outer Race
255. Wheel Hub Nut
257. Rotor/Hub
258. Inner Race
259. Inner Wheel Bearing
260. Seal
261. Nut
262. Washer
Figure 43—K Series Knuckle, Wheel Hub/Rotor Assembly
BEARING ADJUSTMENT
Im portant
• The proper functioning of the front suspension
cannot be maintained unless the front wheel
bearings are correctly adjusted. The cones must
be a slip fit on the spindle and the inside diameter
of the cones must be lubricated to insure the
cones will creep. The adjusting nut must have a
free-running fit on the spindle threads.
Adjust
• Raise the vehicle and support it with safety
stands.
1. Remove the locking hub assembly (249), lock nut
(250), and the ring (251).
a Tighten
• Adjusting nut (252) to 60 N m (50 ft.
lbs.) while rotating the hub/rotor in
order to seat the bearings.
2. Back off the adjusting nut (252) and retighten.
$ Tighten
• For Automatic Hubs, torque the adjusting
nut to 47 N m (35 ft. lbs.) while rotating the
wheel.
• For Manual Hubs, torque the adjusting nut
to 60 N m (50 ft. lbs.) while rotating the
wheel.
3. Back off the adjusting nut (252).
• For Automatic hubs, back off 3/e of a turn
maximum.
263. Plate
264. Bracket
265. Spindle
266. Shaft Bearing
267. Bearing Seal
268. Spacer
269. Seal
270. Oil Deflector
271. Bolt
272. Washer
273. Cap
274. Steering Knuckle
275. Nut
4. Ring (251) and lock nut (252).
%
• Endplay in the hub/rotor assembly. It should be
5. Locking hub assembly (249).
6. Lower the vehicle to the ground.
+ + Remove or Disconnect (Figures 37, 38, and
1. Hub/rotor assembly from the vehicle.
2. Wheel hub bolts (255) with a press.
FRONT SUSPENSION 3C-47
276. Bolt 289. Gasket
278. Bolt 290. Steering Arm
279. King Pin
291. Nut
292. Nut
280. Seal
281. Retainer 293. Lower Ball Joint
294. Upper Ball Joint
282. Race
295. Nut
283. Bearing
296. Adapter
284. Seal
285. Bearing Cap
297. Steering Arm
and King Pin 298. Cotter Pin
286. Bolt
299. Nut
287. Bushing
300. Adjusting Ring
288. Spring
301. Retainer
• For Manual hubs, back off enough to free
the bearing.
• Tang on the inside diameter of the ring must
pass onto the slot on the spindle (265).
• The hole in the ring must align with the pin
on the lock nut (250). Move the adjustment
nut (252) to align the pin.
Tighten
Lock nut (250) to 217 N m (160 ft. lbs.)
minimum.
Measure
set between 0.025 to 0.254 mm (0.001 to
0.010-inch).
• Refer to FRONT AXLE (SEC. 4C).
WHEEL HUB BOLT
44)
Tools Required:
J-9746-02 Hub/Rotor Support
• Refer to " Wheel Hub/Rotor Assembly," in
this section.
• Support the hub/rotor using J-9746-02 to
prevent damage to the rotor face (figure 44).
• Do not damage the wheel mounting surface
on the hub/rotor flange.
B-07464