DS 19 OPERATION No. DS 211 - 3 Overhauling a contact breaker. Op. DS 211-3 140
TOOLS
OVERHAULING A CONTACT BREAKER (with two breakers).
Dismantling (see Pl. 31).
1 Remove the cover. Remove the upper condenser (I) and the lower condenser (2) with their bracket.
2 Remove the upper moving contact (3) with its spring (4) and the lower moving contact (5) with its spring (6).
Do not mislay the insulators (7) and (8). Remove the insulating sleeves (9).
3 Remove the fixed contact carriers (10) and (11). Remove the contact carrier plate (12).
4 Remove the circlip (13) retaining the cam (14), the thrust washer (15) and remove the cam.
5 Remove the centrifugal advance weights (21).
6 Remove the spring (16) retaining the pin (17) of the driving dog (18). Remove the driving dog and the adjusting
washer (19). Remove the shaft (20) from the contact breaker.
7 Clean the parts with trichlorethylene and blow off with compressed air.
8 Make sure that the base of the contact breaker is drilled. If not, drill a 3 mm diameter hole in the base of the body.
Assembly (see Pl. 31).
NOTE - If the surface of the contact points are badly pitted, it is necessary to renew the contacts.
9 Fit the shaft (20) previously oiled, into the body of the contact breaker. Fit the adjusting washer (19) and the
driving dog (18) on the shaft.
Press in the pin (17).
NOTE - The direction of fitting the driving dog is immaterial.
Check the end play which should be approximately 0.1 mm; if not, replace the adjusting washer (19) in order
to obtain this clearance.
Fit the retaining pin (17) and the spring (16). Make sure that the direction of winding the spring is left-hand,
in order to avoid oil leakage (see fig. 4).
10 Oil the centrifugal balance weight spindles (22) and fit the advance weights (21) on the spindles. Fit the cam
(14) on the shaft (20) previously oiled and the spindles in the centrifugal balance weights (21).
Fit the thrust washer (is) and the circlip (13).
11 Put the contact carrier plate (12) in position. Insert a spring washer under the heads of the screws.
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