Steering Gear High Point Centering - GMC 1986 P-Truck Service Manual

3B2-6 MANUAL STEERING GEAR
Figure 7—Checking Torque at Steering Wheel
NOTICE: See "Notice" on page 3B2-1 of this
section.
2. Tighten the adjuster nut (7) to 115 N m (85 ft.
lbs.).
3. If the gear feels " lumpy" after adjustment,
there is probably damage in the bearings
due to severe
adjustment; the gear must be disassembled
for replacement of damaged parts.
• Over-center preload as follows:
1. Turn the steering wheel gently from one stop
all the way to the other carefully counting
the total number of turns. Turn the wheel
back exactly half-way to the center position.
2. Turn the over center adjuster screw (10)
clockwise to take out all lash between the
ball nut (1) and pitman shaft sector (9) teeth
and then tighten the jam nut (11).
Tighten
Jam nut (11) to 30 N m (22 ft. lbs.)
3. Check the torque at the steering wheel,
taking the highest reading as the wheel is
turned through center position. Refer to
" Specifications" for the proper over-center
preload.
4. If necessary, loosen jam nut (11) and adjust
over center adjuster screw to obtain proper
torque. Tighten the jam nut and recheck
torque reading through center of travel.
im p a ct or im p ro p e r
Important
If maximum torque is exceeded, turn
over ce n te r
counter-clockwise, then come up on
adjustment by turning the jam nut (11)
in a clockwise motion.
-►4- Install or Connect
1. Pitman arm onto the pitman shaft. Line up the
marks made during disassembly.
NOTICE: See "Notice" on page 3B2-1 of this
section.
2. Washer and nut.
Tighten
S i
• Nut to 250 N m (185 ft. lbs.).
3. Horn cap or cover.
• Lower the vehicle to the floor.
4. Battery ground cable.
STEERING GEAR HIGH
POINT CENTERING
1. Set the front wheels in the straight ahead posi­
tion. This can be checked by driving the vehicle a
short distance on a flat surface.
2. With the front wheels set straight ahead, check
the position of the mark on the wormshaft de­
signating the steering gear high point. This mark
should be at the top side of the shaft at 12 o'clock
position and lined up with the mark in the cou­
pling lower clamp.
3. If the gear has been moved off high point when
setting wheel in straight ahead position, loosen
adjusting sleeve clamp on both left and right
hand tie rods. Then turn both sleeves an equal
number of turns in the same direction to bring
gear back on high point.
Important
• Turning the sleeves an unequal number of
turns or in different directions will disturb
the toe-in setting of the wheels.
4. A djust toe-in as outline d in FRONT END
ALIGNMENT (SEC. 3A) (if necessary).
5. Orient sleeves and clamps when fastening and
torqueing clamps to specifications. Refer to
STEERING LINKAGE (SEC. 3B1).
a d ju s te r screw