Check brush spring tension

TM 9- 2920- 224- 34&P

ASSEMBLY OF THE GENERATOR - CONTINUED

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d. Check brush spring tension as follows:

NOTE

Side of brushes to which the flexible lead is attached

must be away from spring coils.

1) Using brush spring lifter (5), to move torsion spiral springs (6) as necessary to install a new electrical

contact brush (7).

2) Lift ends of springs (6) into position in metal shoes on brushes (7).

3) Hook spring tester (8) under spring loop and maintain a gradually increasing pull perpendicular to a radius

from spring fulcrum (9) until end of spring just lifts off brush (7). Force necessary to lift each spring just off

a new brush shall be 52 to 60 oz. If any springs are defective, replace entire set from kit.

4) Repeat spring force measurement procedure for other spring (6) at this location.

5) Move new brush (7) to each of five other brush positions and repeat procedure as necessary to measure

tension of ten more springs (6).

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