1993/01/25 Caterpillar

Drive End Bearing Service For 50/75 Amp Brushless Alternators {1405}

Usage:

Engines And Machines So Equipped

There are three different designs for the drive end of the 75 Amp, and some 50 Amp, brushless alternators. Illustrations 1, 2, and 3 identify the differences in the designs. Use the procedures that follow for 8C6163, 4N3986, 4N3987, 8N0999, 5S6698, and 3T1888 (5S9088) Alternator Groups.

Chart A and Illustrations 1 through 3 identify the components used in the different designs.

Illustration 1. First design of the alternator rear bearing area.

Illustration 2. Second design of the alternator rear bearing area.

Illustration 3. Current design of the alternator rear bearing area.

Drive End Bearing

When servicing the drive end bearing, remove and discard the components identified in Chart B. Install the components identified in Chart C.

Servicing Fan, Slinger, Outside Collar

When servicing the fan, slinger, or outside collar, remove and discard the components identified in Chart D. Install the components identified in Chart E.

Caterpillar Information System:

1993/01/25 Special Instruction For Installing VR3 Voltage Regulator On SR4 Generators Now Available {4450}

1993/01/25 New Connecting Rod Bearing Used In Piston And Rod Groups {1219}

1993/01/18 New Cylinder Head Group Used To Help Reduce The Amount Of Oil On The Valve Stems {1102,1109,1104}

1993/01/18 New Exhaust Manifold Group Will Help Reduce Vibration On Bellows {1059}

1993/01/18 New Grommets With Higher Temperature Capacity Used In Clamp Assemblies {1307,1052}

1993/01/18 New And Remanufactured Fuel Injector Reference {1290}

1993/01/18 Cylinder Pack Puller Groups Improved {0705,1239}

1993/01/18 Part Number References For 0R2818, 0R2819, And 0R3231 Remanufactured 3208 Truck Engines {0374}

1993/01/18 New Videotape "Detection of Air and Combustion Gases in the Cooling System" Available {0374,1350}

1992/12/21 New Bellows Assemblies Used In Turbocharger Groups{1052,1059}

1992/12/21 Modifying Former 2W8888 Rocker Arm Shaft For Use With New 8T7581 Rocker Arm Shaft Bolt{1102}

1992/12/21 New Cylinder Head Bolt Tightening Procedure{1100}

1993/01/25 Unit Injector Tip Seal Deterioration {1290}

1993/01/25 Check Engine Water Pump Impeller Face Clearance If The Engine Experiences Symptoms Of Overheating {1361}

1993/02/01 New 9U6101 Lower Pilot Reamer Group Available{0670,1125}

1993/02/08 Maintenance Tips For 6I0799 Exhaust Restrictor; Additional Spring Improves Performance Of 6I0799 Exhaust Restrictor{1119,1061,1088}

1993/02/15 Procedure To Determine Idler Height {4159}

1993/02/15 Aftercooler Core And Turbocharger Compressor Wheel Cleaning Interval {1317,1052,1054,1060}

1993/02/15 New Breather Group And Fumes Disposal Group Help Reduce Oil In Blow-By Fumes {1317}

1993/02/15 New Tank Assemblies Used In Expansion Tank Groups; New Pressure Cap; New Coolant Recovery System Available {1354,1392}

1993/02/15 Maximum Wiring Harness Extension Length Specification {1408,7451}

1993/02/15 New Oil Pump Groups Do Not Require Key On Drive Shaft {1304}

1993/02/15 Valve Seat Insert Removal Tools {0703,1103}

1993/02/15 New Water Seals Used In Cylinder Head Groups; New Water Seal Assemblies And O-Ring Seals Used In Insert Kit {1115}