HOSE 8U4636 - Caterpillar

Brush Continuity Test
Illustration 1 g03224618
Brush continuity test (1) Positive (+) brush (2) Terminal
Put the multimeter on the 200 ohm resistance (Ω) scale. Touch the multimeter leads between positive (+) brush (1) and terminal (2) .
The multimeter reading should .1 to .3 ohms. If the resistance is not correct, the positive (+) brush (1) is open or shorted and the brushes must be replaced.Brush Ground Test
Illustration 2 g03224636
Brush ground test (2) Terminal (3) Negative (-) brush
Put the multimeter on the 20 ohm resistance (Ω) scale. Touch the multimeter leads between negative (-) brush (3) and terminal (2) .
The multimeter reading should be 100000 ohms or greater (meter reading 0.10 or greater). If the resistance is low, the brush is grounded and the brushes must be replaced.