1998/03/23 Caterpillar

Supplement To Article Titled, "Improved Bearings Used In Output Transfer Gear Group"{3159}

Usage:

D20D (9MG1-Up),
D250D (6NG1-315) Articulated Trucks

Reference: Service Magazine; January 20, 1997; Page 19; "Improved Bearings Used in Output Transfer Gear Group".

When adapting D20D (9MG1-Up) and D250D (6NG1-315) Articulated Trucks, further modifications are necessary.

The 2U-6998 Valve and 2U-6513 Solenoid Group need to be replaced by the 3E-9257 Solenoid Valve Group. See Item (1) in Illustration 1.

Illustration 1.
7U-6711 Transfer Gear Group

(1) 3E-9257 Solenoid Valve Group (replacing the 2U-6998 Valve and 2U-6513 Solenoid Group).

(2) 7U-6724 Oil Seal Holder to be reworked.

The 7U-6724 Oil Seal Holder (Item 2 in Illustration 1) needs to be reworked to accommodate the addition of the plug in the 129-5309 Carrier Assembly as described in the referenced article. The rework dimensions are in Illustration 2.

Illustration 2.
7U-6724 Oil Seal Holder.

(A) 12.00 ± 0.25 mm (.472 ± .010 in)

(B) R12 mm Max (R.5 in Max)

(C) 45 Degrees

(D) 83.00 + 0.05-0.00 mm (3.268 + .002-.000 in)

Caterpillar Information System:

1998/03/23 Supplement To Disassembly And Assembly Manual; Procedure To Remove Torque Converter And Hydraulic Retarder{3109,3101,3115,3120,3123,3124,3133}

1998/03/23 A New Engine Auxiliary Water Pump Group (SCAC) And Changes To The Aftercooler Water Lines Group Provide Increased Serviceability{1371}

1998/03/23 New Custom Product Support Literature Is Available For 785B Trucks Equipped With 3Z-5232 Espar Heater Arrangement (Factory And Field Installation){0374,1296}

1998/03/23 New Custom Product Support Literature Is Available For 776B, 776C, 776D Tractors And 777B, 777C, 777D Trucks Equipped With 3Z-5422 (Factory Install) Or 3Z-6037 (Field Install) Flexxaire Fan Drive Group{0374,1359}

1998/03/23 Improved Door Handles And Latches Improve Operation{7308}

1998/03/23 Use 139-7050 For Initial Pressure Adjustment Procedure{3150}

1998/03/23 Use 143-7597 Differential Lifting Bracket To Remove Differential Assembly{3258}

1998/03/23 Bezel Prevents Inadvertent Seat Adjustment{7312,7324}

1998/03/23 Use 143-7145 Lifting Bracket To Remove And Install Cast Driver{0632}

1998/03/23 Service Magazine Special Edition, SEPD0392, Available{0374}

1998/03/16 Improved Telehandler Electrical System Requires New Fuses{1609,1417}

1998/03/16 Procedure For Keeping Boom Pads Tight{6460}

1998/03/23 Procedure To Check Hydrofill Levels In Tires{4207}

1998/03/23 Lower O-Ring Seal Removed From Mechanical Fuel Injector Group{1290}

1998/03/23 Use 147-5482 Valve Lash Gauge Group To Measure Valve Lash{0766}

1998/03/23 Use 152-2067 Differential Pressure Gauge To Monitor Aftercooler Pressure Drop In Applications With Crankcase Fumes Recirculation{1063}

1998/03/23 Use 142-5055 Insulation Tester Group To Measure And Check Insulation Resistance{4450,0785}

1998/03/23 Replacement Available For 7M-7260 Liquid Gasket{0648,0649,0651}

1998/03/23 Use 143-6092 Pressure Meter To Measure Differential, Static, And Peak Pressures In Hydraulic Systems{3000,4100,4112,4351,5050,5070,5450,5454,0727}

1998/03/23 Replacements Products Available For 4C-4079 Brake And Component Cleaner{0680}

1998/03/30 Paint Color Changes Summarized {7581,7559}

1998/03/30 Correction To Proper Assembly Of Elbow And O-Ring Seal For The Piston Pump Group {5055}

1998/03/30 Use 133-8877 Field Service Tool Group For Routine Maintenance And Adjustment Operations {7500}

1998/03/30 Procedure To Install Rear Axle On Certain Off-Highway Trucks Has Been Changed {3278,4208}