2. MOTORS
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(4) Checking the commutator
The commutator is the most important part of the motor. If operated with oil or dust sticking to it,
the brush will be abnormally worn and commutator operation will be disabled. Keep it always clean by
removing such foreign matters by air blow or by wiping with dry, clean cloth.
If the surface of the commutator gets rough, polish it with sandpaper #500 or #600, then thoroughly
clean the commutator. If it gets too rough, it needs to be repaired by cutting.
If it is cut, the depth of the segment mica should also be corrected.
Finish the depth of the mica to 0.8 to 1.0 mm [0.0315 – 0.0394 in] measured from the surface of the
commutator for both the pump motor and drive motor.
Repairing the commutator requires special machine tools. Ask a specialized shop for repairing it.
■
Standard service data
Unit: mm [in]
Standard value
Standard length 27 [1.06]
Brush Residual length 13 [0.51]
Spring force N {kgf}[lbf] 13 {1.33} [2.92]
O.D. 85 [3.35]
Commutator
Repair limit 82 [3.23]
Mica depth 0.7 - 1.0 [0.028 - 0.039]
Depth limit 0.2 [0.0079]
Shaft thrust
Standard 1.0 [0.039]
Limit 1.8 [0.071]
Bearing grease Brand name Multemp SRL
Coil resistance (Ω)
Armature 0.0173
Field 0.0106
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