User's Manual

GEH-5304A

Do not use liquid solvents of any kind. Solvents will not remove carbon dust

accumulations, but will spread and wash them into critical areas.

Figure 2

Brush Assembly

F. Commutator

Keep the commutator clean. Ordinarily, the commutator will require only occasional wiping with a piece of

canvas or other nonlinting cloth. Do not use lubricant or solvent on the commutator. Check the commu-

tator for roughness while running by feeling the brushes with a fibre stick, avoiding contact with live electri-

cal or moving mechanical parts. Chattering brushes give advance warning of deterioration of the commuta-

tor surface. (Refer to the Commutator Check Chart (GEA-7053) for commutator surface marking and causes

of poor commutator condition.) Commutator runout over .003” T.I.R. (Total Indicator Reading) and bar-to-

bar readings over .003” indicate need for repair. (Refer to Table 12.)

The presence of silicone in DC motors, particularly with totally enclosed con-

structions, will cause rapid brush wear. Sources of silicone include oils, RTV

compounds, hand creams, mold release agents, grease and some insulating

varnishes. These silicone substances must be avoided to ensure proper motor

performance.

Table 12

Commutator Diameters (In Inches)

Frame Start Min. Wear

CD2512AT 5.30 5.02 0.140

CD2513AT

CD2812AT 5.96 5.66 0.150

CD2813AT