1977/11/21 Caterpillar

Add Chamfer To Cartridge Assembly Bearings To Prevent Oil Leakage{1052,1053}

Usage:

3304 Industrial and Marine Engines;
3306 Industrial, Marine and Truck Engines;
D6C, D6D, D7G, 814, 627B, 627B Push-Pull Tractors;
815 and 816 Compactors;
950, 955K, 955L, 966C, 977K, 977L and 980B Loaders;
518 and 528 Skidders;
14G, 120G, 130G, 140G Motor Graders;
571G and 572G Pipelayers;
225 (76U) and 235 Excavators;
627B, 637D, 627B and 637D Push-Pull Scrapers Equipped with Schwitzer 3LM Turbochargers

There have been reports of oil leakage at the oil seal on the turbine end of Schwitzer 3LM Turbochargers. If any of the above models have this type of leakage, check the 6N1533 Bearings of the cartridge assembly.

These bearings must have a small chamfer on each end. If there are no chamfers, the result can be oil leakage. A modification can be made to any 6N1533 Bearing as shown in the Illustration. This same modification can also be made to parts stock 6N1533 Bearings.

Modification of 6N1533 Bearing.

Caterpillar Information System:

1977/11/21 New Housing And Impeller Assembly For Water Pump And Drive Group{1361}

1977/11/21 Improved Shaft Seal Material Used In All Vane-Type Hydraulic Pumps; Seal Kits Are Canceled{5055}

1977/11/21 Larger Diameter Holes Are Now Used In The Rocker Arm Shaft To Give More Oil Flow To Rocker Arm Bearings{1102}

1977/11/21 New Crankshafts Do Not Have Lightening Holes And Lubrication Passages Connected Together{1202,1219}

1977/11/21 New Elbow Between Turbocharger And Air Inlet Manifold Has Hole For Ether Starting Aid{1058,1456}

1977/11/14 New Exhaust Manifolds Made Of Stronger Material{1059}

1977/11/14 Exhaust Valves With 30° Face Angle Now Used For Parts Service{1101,1103,1105}

1977/11/14 New Electric Starting Motor Has Longer Brush Life{1453}

1977/11/07 Precision Oil Pump Bearings Now Available{1304}

1977/11/07 Improved Crankshaft Main Bearings And Connecting Rod Bearings With Higher Strength Aluminum Alloy{1203,1219,1230}

1977/11/07 Crankshaft Support Groups Are Available To Measure Bent Crankshafts{0653,1202}

1977/10/31 Some Wobble Is Acceptable In Rubber Vibration Dampers For Crankshafts{1205}

1977/11/28 Reference Chart For Main And Connecting Rod Bearings{1203,1219,1230}

1977/12/05 Water Separators Needed On Machines And Engines In The Field With SMFS{1250,0336}

1977/12/05 New Oil Filter Base Has Reinforcement Around The Center To Prevent Possible Cracks{1306}

1977/12/05 Use The 5P8610 Auxiliary Fitting Group To Charge Two Suspension Cylinders At The Same Time{0690,7201}

1977/12/05 New Fuel Injection Valve Assembly Has Improved Internal Components{1254}

1977/12/12 Use Hardened Flat Washers With Diagonal-Split Hydraulic Flanges{5057,7553}

1977/12/12 New Coolant Tube And Regulator Housing Used With Water Cooled Exhaust Manifold Gives More Clearance For Hooks To Lift The Engine{1350,1355,1380}

1977/12/12 Excessive Oil Consumption Can Be Caused By Dirt In Air Inlet System Or By Flaking Of The Piston Compression Ring{1213,1215}

1977/12/19 Improved Mounting Base For Air Compressor{1065}

1977/12/19 New 5P7450 Torque Multiplier For Torque Applications Up To 1500 LB FT (2030 N·m){0614}

1977/12/19 Maintenance Instructions For Coolant Conditioner Elements{1350}

1987/01/05 New Water Temperature Regulators Available {1355}