1997/01/20 Caterpillar

Improved Bearings Used In Output Transfer Gear Group {3159}

Usage:

D20D (9MG),
D250D (6NG),
D250E (5TN),
D300E (7FN) Articulated Trucks

SUPPLEMENT: MARCH 23, 1998

Service Magazine SEPD0341; Article 19; January 20, 1997; Page 19; "Improved Bearings Used In Output Transfer Gear Group".

See article in Service Magazine SEPD0409, Article 15, Page 10 titled "Supplement to Article Titled 'Improved Bearings Used In Output Transfer Gear Group'" for adapting D20D and D250D Articulated Trucks.

--------------- END SUPPLEMENT ---------------

Description of Change: New bearings are being used in the 118-2282 Transfer Gear Group (output transfer gear group). The new bearing cone and bearing cup are a larger diameter than the former bearing and require a new 129-5309 Carrier Assembly and a 129-5311 Piston Housing.

Adaptable To: The improved 5J-3948 Bearing Cone, 5J-3947 Bearing Cup and related carrier assembly and piston housing, are in effect with D250E (5TN318-377, 379-380, 385-Up) and D300E (7FN1-Up) Articulated Trucks. The new bearing cone, bearing cup and related carrier assembly and piston housing can be installed on earlier D250E (5TN1-317, 378, 381-384), D20D (9MG1-Up) and D250D (6NG1-Up) Articulated Trucks. The former bearings are still serviced.

The location of the new parts are shown in the illustration.

NOTE: When installing the new bearings and related parts, install a new 6T-0840 Internal Piston Seal Ring and a 8D-9738 External Piston Seal Ring, shown in the illustration.

Location of Parts (1) 5J-3948 Bearing Cup. (2) 5J-3947 Bearing Cone. (3) 129-5309 Carrier Assembly. (4) 129-5311 Piston Housing. (5) 6T-0840 Internal Piston Seal Ring. (6) 8D-9738 External Piston Seal Ring.

Caterpillar Information System:

1997/01/20 New Check Valve Group And Larger O-ring For Load Monitoring System Eliminates O-ring Interference {5067,7200}

1997/01/20 Increased Tightening Specification Improves Retention Of Thrust Washer Screws In Final Drive {4051}

1997/01/20 New Ether Starting Aid Groups Include Flexible Hose Assemblies Instead Of Tube Assemblies {1456}

1997/01/20 Modification Of Electronic Control Module (ECM) Controlled Variable Speed Fan Clutch Bracket-Shaft Assembly For Easier Fan Speed Sensor Removal {1359}

1997/01/20 "E-Trim" Unit Fuel Injectors {1290}

1997/01/20 Special Edition, SEPD0325, "Major Improvements And Service Information For 768C, 772B, 776C, 776D Tractors, 771C, 771D, 775B, 775D Quarry Trucks And 769C, 769D, 773B, 773D, 777C And 777D Trucks" Is Available {0374}

1997/01/20 Adjustment To Window Hold Back Latch Improves Operation {7301,7310}

1997/01/20 Cab Rear Window Improvements Provide Improved Sealing And Visibility {7301,7310}

1997/01/13 Quickly And Accurately Set Valve Lash{1105,0766}

1997/01/13 Use 125-9622 Seal Installer To Install 118-9163 Seal In Water Pumps{1361,0708}

1997/01/13 Piston Ring Groove Gauges To Quickly And Accurately Determine Reusability Of Pistons{1214,0763}

1997/01/13 Use 126-1023 Stem Pusher For Sleeve And Coupling Removal On Hose Assemblies{5057,0684}

1997/01/20 Dump Body Mounted Mud Deflectors (Mud Flaps) Are Available To Prevent Mud From Being Thrown On The Back Of The Tractor {4220}

1997/01/20 A Port Now Provided In The Engine Oil Filter Group For Scheduled Oil Sampling (S.0.S.) {7542,1306,1051}

1997/01/20 VIMS-PC Service Tool Operating System Environment Answers {7601}

1997/01/20 Methods Of Obtaining Engine Flash Files {1902}

1997/01/20 New Remanufactured Water Pump Groups Include Cast Iron Impellers {1361}

1997/01/20 Improved Multi-Row Modules (IMRM) Used In Caterpillar Radiators Have Different Designs {1353}

1997/01/27 Charcoal Air Filter Available Reduces Odors From Outside Air {7309,7320,7342}

1997/01/27 Improved Procedure For Preloading Final Drive Bearings Now Available {4050,4059}

1997/01/27 An Improved Adjustment Procedure For The Steering Console Cylinder Eliminates Steering Console Drift {4300,5258}

1997/01/27 Special Instruction, REHS0033, "Assembly Procedure For 777D Truck Body" Is Available {0374,7258,7960}

1997/01/27 New Temperature Sensor For Differential Improves VIMS Data Accuracy {3290,7601}

1997/01/27 New Shield In The Exhaust Shield Group Gives Improved Service {1067}