ELECTRICAL EQUIPMENT—Q.17Finally, when the two contacts are assembled, thedistance between them on the first step, should beaccurately maintained at 0.071 in to 0.056 in (1,80 to1,42 mm). To compensate, shims may be added underthe "fixed" contacts, prior to machining.ASSEMBLING THE STARTER1.Assemble the pole-shoes and field-coils and fixinto yoke with the aid of a pole-shoe expanderand a wheel operated screw-driver. Care shouldbe taken not to trap the leatheroil (25) Fig. Q.9beneath the pole-pieces. See that the screwholes in the field coils are in their correct positionfor connecting to the brush boxes and solenoidswitch.ASSEMBLING SWITCH1.Screw the solenoid into the drive end-shield.Check that the solenoid end-plate is flushagainst the drive end-shield shoulder, and paintinsulating varnish at live points near to earth toprevent tracking.2.See that the solenoid earth lead is attached tothe "fixed" contact screw (59). (Note that in"insulated return" machines, this lead is taken toa different point, viz, one side of connecting linkbracket).3.Assemble solenoid terminal (46) in drive end-shield and connect the solenoid lead to it.Assemble the positive main terminal (47) Inposition, but do not tighten.4.Assemble the moving contact onto the plungerand see that the contact spring is correctly andfirmly located. Ensure that the second turn ofthe spring cannot jump over the first coil, bypushing the plunger through the moving contactassembly, until it is fully compressed.5.Place the plunger return spring (14) in position.Oil the plunger by lightly smearing with CaltexThuben 90 oil. Insert the assembled contactand plunger into the solenoid. As the plunger isinserted, its locating shoulders must pick up withthe return spring.Fig. Q.13. Face Plate.
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