Overhaul
2.9Tighten upper fastening bolt (31.2) on the upper
2.10The centering ring (28.1) has been loose and floating during installation of the vacuum interrupter. Check that the movable contact is free to move vertically without binding, and then tighten the hardware that secures the centering ring.
2.11Attach insulating coupler (48.0) and lever (48.6) together, using pin
(48.5). Apply retaining clips. Correct pin has ends that have been generously chamfered.
2.12Open and close circuit breaker several times and then check to see that all bolted joints and devices are tight.
3.0Checking the contact stroke
3.1Open the circuit breaker.
3.2Free insulating coupler (48.0) by removing pin (48.5). The vacuum interrupter contacts must now close automatically as a consequence of atmospheric pressure.
3.3Observe the terminal clamp (29.2) through the openings on each side of the lower pole support (40.0).
Using vernier calipers measure the distance from the bottom surface of the terminal clamp to the bottom edge of the cutout opening. Measure carefully and record your result.
3.4Connect the insulating coupler (48.0) using pin (48.5) and the retaining clips provided.
3.5Repeat the measurement described in step 3.3 again with care to maximize accuracy. Record your result.
3.6Determine difference between the measurements made under steps 3.3 and 3.5. Your result should be 18 mm to 22 mm (0.709" to 0.866 ").
3.7If you fail to achieve the listed results, carefully repeat the entire procedure making certain of your measurements.
3.8Loosen locking nut on eye bolt on insulated coupler (48.0), and retain position of the eye. Make adjustments in
(35 to 45 Nm).
4.0After eye bolt is tightened to proper torque, repeat all measurement procedures, making certain they are in agreement with values indicated in step 3.6.
5.0Complete all other maintenance procedures. Completely reassembled circuit breaker should pass high- potential test before it is ready for service.
Hydraulic shock absorber
The type
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