ELECTRICAL EQUIPMENT—Q.17
Finally, when the two contacts are assembled, the
distance between them on the first step, should be
accurately maintained at 0.071 in to 0.056 in (1,80 to
1,42 mm). To compensate, shims may be added under
the "fixed" contacts, prior to machining.
ASSEMBLING THE STARTER
1.
Assemble the pole-shoes and field-coils and fix
into yoke with the aid of a pole-shoe expander
and a wheel operated screw-driver. Care should
be taken not to trap the leatheroil (25) Fig. Q.9
beneath the pole-pieces. See that the screw
holes in the field coils are in their correct position
for connecting to the brush boxes and solenoid
switch.
ASSEMBLING SWITCH
1.
Screw the solenoid into the drive end-shield.
Check that the solenoid end-plate is flush
against the drive end-shield shoulder, and paint
insulating varnish at live points near to earth to
prevent tracking.
2.
See that the solenoid earth lead is attached to
the "fixed" contact screw (59). (Note that in
"insulated return" machines, this lead is taken to
a different point, viz, one side of connecting link
bracket).
3.
Assemble solenoid terminal (46) in drive end-
shield and connect the solenoid lead to it.
Assemble the positive main terminal (47) In
position, but do not tighten.
4.
Assemble the moving contact onto the plunger
and see that the contact spring is correctly and
firmly located. Ensure that the second turn of
the spring cannot jump over the first coil, by
pushing the plunger through the moving contact
assembly, until it is fully compressed.
5.
Place the plunger return spring (14) in position.
Oil the plunger by lightly smearing with Caltex
Thuben 90 oil. Insert the assembled contact
and plunger into the solenoid. As the plunger is
inserted, its locating shoulders must pick up with
the return spring.
Fig. Q.13. Face Plate.
