Chevrolet 30 Series 1967 Service Manual page 198

REAR SUSPENSION AND DRIVE LINE 4-40
4. Disconnect wire at plug.
Disassembly
Key numbers in text refer to Figure 74.
1. Remove six screws (22) and lock washers which at­
tach cover (20) to shift motor housing (5). Drain
lubricant from housing. Remove gasket (19).
2. After removing cover, the drive screw nut (25) will
be at either top or bottom depending upon the posi­
tion in which the control switch was left.
3. By turning drive screw, run nut from top or bottom
to the center of the screw (fig. 80).
NOTE:
Performing step 3 is essential to pre­
vent damage to drive nut contact bumper (24).
4. Remove shift fork actuating lever (16), torsion spring
(17), and spring winding lever (18) as an assembly by
pulling shaft (15) up. Swing the assembly away from
the drive nut and lift out of the housing (fig. 81).
5. Remove three screws and lock washers (14) which
attach bearing cover (13). Remove cover ans gas­
ket ( ).
1 2
. Push down on drive screw assembly (23) until bear­
6
ing assembly ( ) is free of housing.
1 0
7. Insert screwdriver in drive slot of screw (fig. 82);
then remove bearing lock nut (
snap ring (10). Drive screw assembly can then be
lifted out of housing.
. Remove the two lock nuts (fig. 83) from terminals on
8
switch (27) and pull off motor wires.
9. Remove three screws and lock washers (1) which at­
tach motor cover to housing (5). Pull out motor with
cover attached and remove cover gasket (4).
10. Remove two jam nuts (9), and insulator (7) from
outside of housing. On inside, remove switch center
screw (26). Pull out automatic switch as shown in
Figure 84.
11. Do not disassemble the shift fork actuating lever (16),
torsion spring (17), and spring winding lever (18).
Replace actuating lever, torsion spring and spring
winding lever as an assembly.
F ig . 7 9 - Shift Unit Removed from C a rrie r
) and bearing with
1 1
Fig. 80 - Shift U nit D rive N u t Position for Disassembly
Inspection and Test
F irst clean all parts except motor in cleaning solvent,
then inspect and test as follows:
Automatic Switch. The switch is serviced only as an
assembly. The switch should have clean, flat, free mov­
ing points which close squarely under spring tension.
Points should open when a force ranging from 14 to 24
ounces is applied against spring pressure in the point
area of the movable contact.
Drive Screw. While holding the nut, rotate the screw
from one end to the other. It should rotate freely. When
F ig . 81 - Removing Sh aft, Actuating Lever and Spring
CHEVROLET TRUCK SERVICE M ANUAL