143Service Manual – SC401, SCRUBTEC 344 34 - Scrub System, Disc
Brush Motor Current Draw Test
WARNING: This procedure must be performed by qualied personnel only.
1. Drive the machine on a level oor.
2. Remove the brush.
3. Lift down the brush deck with the lever.
4. (If equipped) Turn the ignition key to “I”.
5. Press the Main button
to start the machine.
6. Switch off the vacuum system (A, Led off), the detergent system (B, Led off ) and (if present) the Speed
adjuster (C) rotated to the left end.
7. Apply the amperometric clamp (D) to an electrical cable (E) of the brush motor.
8. Activate the brush by the presence sensors (F), then check that the brush motor current draw is between
1 and 2A at 20V(*).
9. Deactivate the brush by releasing the presence sensors and raise the brush deck.
10. Remove the Amp clamp (D).
11. If the amperage is higher or unexpeted, perform the following procedures to detect and correct the
abnormal amperage:
◦ Check the brush motor carbon brushes.
◦ Remove the brush motor then check the condition of its components.
12. If the above-mentioned procedures do not lead to a correct amperage, it is necessary to replace the brush
motor.
Figure 6:
A
B
C
D
E
F
(*) Voltage value supplied by the Main machine controller to the brush gear motor when the gear motor cur-
rent draw is less than the value of the RPM parameter.
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