COVER 8S3746 - Caterpillar

Every 500 Service Meter Units
Inspecting Slip Rings-SRCR Only
1. Remove the three lower panels from the rear of the generator housing. 2. Inspect the color of each slip ring.The color may be shiny copper, straw, chocolate or black. The important thing is the color must be uniform to indicate a satisfactory condition.3. If a ring contains blotches of green, blue or black, clean the ring with a cleaning solvent that does not leave an oily film such as Naptha.
Do not use gasoline or carbon tetrachloride. The vapors from carbon tetrachloride can be extremely harmful when inhaled. Either solvent will dissolve insulation.
4. Inspect each ring for pitting, roughness, or eccentric wear. If any of these conditions are present, contact your Caterpillar dealer; the rings must be reconditioned.5. If pitting is found, determine if the cause is (a) or (b):a. Check the rating on the generator nameplate. The generator load must be within this rating. Determine if the generator may have been operated in an overload condition.b. Check the brushes for incorrect spring tension.Each brush must move freely within its holder and have enough spring load to prevent brush flotation. Using a small spring scale, calibrated in ounces, lift each spring and check the spring tension for each brush.