Chevrolet 70 1969 Series, Руководство по ремонту

Страница: 158 / 913

REAR SUSPENSION 4 A - 1 9
inal. Tighten inside terminal nuts (19) firmly.
4. With a screwdriver inserted into slot of
drive screw (20), install bearing (12) on end of
screw with shielded side of bearing toward inside.
Retain bearing with bearing lock nut (13).
5. Run nut to center of screw, then insert
slotted end of screw into housing, meshing slotted
end with armature shaft.
N O T E : Fiber bumper contact on drive nut
must be toward switch.
6. Install gasket (14) and cover (15) with three
screws and lock washers (16). Tighten screws
firmly.
N O T E : Remainder of assembly of shift unit
used on Rockwell axles must be completed when
unit is installed on housing asdescribedpreviously
in this section under "Two-Speed Shift Unit Re­
placement."
AIR SHIFT CHAMBER OVERHAUL
On some rear axles equipped with inter-axle
differential lock, an air shift chamber is used to
shift the inter-axle into a locked position. Cham ­
ber has been previously removed as previously
instructed in this section.
D ISASSEM BLY (Fig. 29)
1. Before disassembling, mark both halves of
chamber, also clamp ring so that these parts will
be in their proper relation to each other at reas­
sembly.
Figure 29— Inter-Axle Air Shift Chamber
2. Remove clamp ring bolts, then spread
clamp ring and remove.
3. Remove chamber cover and diaphragm.
4. Pull shift rod and plate from chamber body.
5. Remove air cleaner and oil seal from cham­
ber body.
C L E A N IN G A N D INSPECTION
1. Immerse all metal parts in cleaning solu­
tion to remove all oil, grease, and foreign matter.
2. Inspect diaphragm and replace if evidence
of wear or deterioration is present.
3. Inspect shift rod for excessive wear.
4. Inspect chamber body and cover for damage
that would effect proper function.
A S S E M B L Y (Fig. 29)
1. Install new oil seal in chamber body with
lip of seal toward outside.
2. Install air cleaner and retainer in chamber
body.
3. Install shift rod and plate in chamber body,
being careful that lip of oil seal is not damaged.
4. Install diaphragm and chamber cover on
chamber body, being careful that diaphragm is
evenly positioned.
5. Install clamp ring and secure with two bolts
and nuts.
VACUUM SHIFT CHAMBER OVERHAUL
On some rear axles equipped with inter-axle
differential lock a vacuum shift chamber is used
to shift inter-axle into a locked position.
D ISA SSEM B LY (Fig. 30)
1. Remove rubber boot from diaphragm rod
and yoke.
2. Loosen yoke nut, then thread yoke and nut
from diaphragm rod.
3. Remove nut, bolts, and washers attaching
chamber outer cover to inner cover, then remove
cover.
4. Remove diaphragm and rod assembly from
inner chamber.
5. Remove diaphragm nut, then remove dia­
phragm, washers, and plates from diaphragm rod.
C L E A N IN G A N D INSPECTION
1. Clean all metal parts thoroughly, using a
suitable cleaning fluid.
2. Inspect diaphragm and all other parts for
damage or deterioration. Parts showing evidence
of damage or wear should be replaced.
R E A S S E M B L Y (Fig. 30)
1. In the order listed install following parts
on diaphragm rod: Nut, plain washer, small dia­
phragm plate, diaphragm, large diaphragm plate,
plain washer, and nut.
1 Chamber Cover
2 Air Inlet
3 Diaphragm
4 Pressure Plate
5 Chamber Body
6 Oil Seal
7 Push Rod
8 Felt
9 Felt Retainer
10 Clamp w/Bolts
T -3 3 2 9
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK SH O P M AN U AL