TM 5-4310-343-35
(k) Install key (49) on armature (42). Press hub (48) over the key. Install fan (47). Install ring (45).
Position the ring with its concave side outward. Press ball bearings (44, and 43) in place. Dynamically balance the
armature.
(l) Install the armature in the stator Install load spring (50) and the end bell assembly.
(m) Install retaining plate (25). Install grounding terminal (9).
(n) Make end bell electrical connections. Connect the shunt lead and grounding terminal (19) to the
nearest grounded brush box. Connect grounding plate (24) between the shunt lead and the opposite brush box. Use
screw (28), and washer (29) in the position illustrated. Connect the series field lead to the nearest positive brush box.
Connect one electrical lead (31) between each brush box terminal and the terminal for brush attaching screw (20).
(o) Install fan (18). Position the fan so that setscrews (17) contact the flats on the shaft of armature (42),
and so that there is 1/32 inch clearance between the face of the fan and the-heads of screws (27, and 28).
(p) Install insulator (11), base (10), and associated parts.
(2) Test reassembled motor as follows:
(a) No Load Test. Apply 27 volts DC to terminals of motor. Operate motor until brushes are fully seated.
Motor shall run smoothly without nose or excessive heat rise and shall not draw more than 30 amperes.
(b) Dielectric Test. While motor is still warm from the no load test, remove the ground ed brushes and
apply 500 volts, 60 CPS (RMS), between the terminals. There must be no flashover or evidence of breakdown of the
insulation.
(c) After no load and dielectric tests, check that all brushes are in place and install radio interference filter
(5). Position top nut (3) so that there is no strain on the connecting strap of the filter when nut (1) is tightened.
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