Electric Motor
MERGE 12-9
Chapter 12
Items Adjustment limits
Commutator diameter（min) 2.265inch（66.675mm）
Commutator coaxial shaft with armature shaft
0.001inch（0.0254mm）
Maximum kerf depth in processing commutator
0.005inch（0.127mm）
Oscillation of the commutator bars should not
exceed:
0.002inch（0.00508mm）
In case the undercut of the commutator segment
insulator is smaller than 0.16 inch（0.406mm）, the
undercut should be:
0.031inch（0.8mm）
Machined surface of the commutator
8－16microinch（203.2－
406.4nm）
Resistance of the excitation coil（IQ system，3.20hp） 1.61Ω（ohm）
Assembly of the electric motor
1. In case the bearing is removed, the replacing one should be mounted. Please refer to "Mounting of
the Bearing" in this chapter.
2. Mount the brush.
NOTE: Once the brush is removed, the replaced one should be mounted. This can ensure
that the connecting terminal and brush be properly aligned in the transmission gear. For the
mounting of brush, please refer to "Assembly of the electric motor".
Once one brush is replaced, all the other brushes should also be replaced at the same time.
Never replace only two of them.
Brushes should be mounted on the same transmission gear, and the two brushes connected
should be symmetrically mounted.
2.1. Secure the brush transmission gear a little higher than the top of end shield ⑩ and make it
face upwards. Insert two terminals through the insulator to the end shield of A1 and A2. Insert
the bolts
○
11 into the brush transmission gear to the threaded hole of the end shield (see Fig
12-9). Tighten the bolt with a torque of 22 inch pound（2.5N·m).
2.2. Press the elongated portion of the brush back to the original once a time, and push back the
brush till all of them return to the installation grooves. Align the brush spring to one side of the
brush so that the pressure of the spring can hold it in the retraction state (see Fig 12-3).
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