Changing The Carbon Brushes On Motor Types Uus 390 And Uus - Pfaff Select 1520 Service Manual

51. Changing the carbon brushes on motor types UUS 390 and UUS 393

Removal:
Remove the motor in accordance with point 49of this manual.
Slightly raise the two locking tabs 163 and remove cover 162 (fig. 115).
Unscrew the two groove nuts 170.
Pull the motor apart and remove end shield 171.
Detach the torsion springs and remove carbon brushes 169.
Clean the collector and the motor.
Refitting:
Insert the two new carbon brushes and re-attach the torsion springs.
Refit end shield 171.
Insert the two groove nuts 170 and firmly tighten.
Insert cover 162 onto one side and allow it to engage on the other.
Measure the simulated leakage current in accordance with section 58 of this manual.
Fit the motor in accordance with section 49.
Carry out an electrical safety test in accordance with VDE 0701 using testing appliance ABB Metrawatt
M 5013.
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