Commutator Inspection Surfaces of Commutators that need Replacement EHPS009B EHPS011B Marks on the Commutator Surface Grooves on the Commutator Surface Marks on the commutator surface are an indication that metal has moved from the commutator surface to the carbon brushes. Marks will cause fast brush wear. Grooves on the commutators surface are caused by a cutting material in the brush or atmosphere. EHPS012B EHPS010B Copper Drag on the Commutator Surface Threads on the Commutator Surface Copper drag is an extra amount of commutator material at the back edge of the commutator bars. Threads (grooves that look like threads) on the commutator surface, will also cause fast brush wear.
Power Train Testing And Adjusting 17