1997/06/02 Caterpillar


Center Support Bracket Transition Castings Changed To Improve Service Life {3268}

Usage:


785B (6HK),
789B (7EK),
793B (1HL) Off-Highway Trucks

Description of Change: New center support bracket transition castings are used in new center support assemblies. The new center support assemblies are used in some off-highway truck frame assemblies. The new center support bracket transition castings have larger flanges and are designed to reposition the frame assembly front weld joint between the main rail and center support assembly. The larger flange and repositioned weld will increase weld joint service life.

Adaptable To: Center support bracket transition castings and center support assemblies used in the following frame assemblies have been canceled and replaced with new castings and assemblies as described above. These changes are effective with:

* 7I-5537 Frame Assemblies (not serviced) used in 785B (6HK621-Up) Off-Highway Trucks.
* 7I-5538 Frame Assemblies (not serviced) used in 789B (7EK553-Up) Off-Highway Trucks.
* 7I-5483 Frame Assemblies (not serviced) used in 793B (1HL404-Up) Off-Highway Trucks.

The center support bracket transition castings and center support assemblies are not available as serviceable parts. The changes described above are only adaptable through replacement of the truck frame assembly.


View of new center support assembly bracket transition castings.

Caterpillar Information System:

1997/06/02 New Custom Product Support Literature Is Available For 773D Trucks Equipped With 250 Gallon Fuel Tank {0374,1273}
1997/06/02 New Custom Product Support Literature Is Available For 793C Trucks Equipped With Rim Mounting Group {0374,4202,4209}
1997/06/02 New Custom Product Support Literature Is Available For 773B And 773D Off-Highway Trucks Equipped With Cluster Lubrication System {0374,7540}
1997/05/26 Correct Orientation For 3E-8827, 9X-6796, 9X-9096, 107-7977, 117-1379, 121-4134, 121-4135, 125-9597, And 132-2156 Alternators During Installation{1405}
1997/05/26 Safety Manuals For Each Product Line Are Available{0353,0375}
1997/05/26 New VIMS-PC Customer Site License And Annual Subscription{7601}
1997/05/26 New VIMS Message Center Display Available{7601}
1997/05/26 Variable Speed Fan Drives{1359}
1997/05/26 New Custom Product Support Literature Is Available For 784B Tractors And 785B, 789B, And 793C Trucks Equipped With Roller Visor Group{0374,7165}
1997/05/26 New Custom Product Support Literature Is Available For 776D Tractors And 777D Trucks Equipped With Rubber Step Group{0374,7254}
1997/05/26 New Custom Product Support Literature Is Available For 784B Tractors And 785B Trucks Equipped With Crankcase Guard{0374,7151}
1997/05/26 New Custom Product Support Literature Is Available For 776D Tractors And 769D, 771D,773D, 775D, 777D Off-Highway Trucks Equipped With Power Converter Arrangement{0374,1421}
1997/06/02 New AETA Pickup Collar Used On Axle Shafts To Provide Improved Clamping Force {3259,3250,3278}
1997/06/02 New Chrome-Plated Stem On Exhaust Valve Increases Valve And Valve Guide Wear Life {1105,1100}
1997/06/02 New Custom Product Support Literature Is Available For 776D Tractors And 777D Off-Highway Trucks Equipped With Hoist Control {0374,5102,5136}
1997/06/02 New Custom Product Support Literature Is Available For 776B, 776C, 776D Tractors, And 777B, 777C, 777D Off-Highway Trucks With An Automatic Lubrication System {0374,7540}
1997/06/02 New Fuel Injectors Reduce Oil Carryover {1290}
1997/06/09 Procedure For Adjusting Throttle Linkage {1265}
1997/06/09 Improved Fan Access Panel Bracket Improves Service Life {7273,7251,7267}
1997/06/09 Anti-Corrosive Coating Is Used On Air Compressor Inlet Valve Springs {1803}
1997/06/09 Salvage Procedure Increases Service Life On Load Line And Boom Line Drums {5401}
1997/06/09 New Duo Cone Seal Retainer Used In Front Brake Groups To Improve Seal Service Life {4251,4267,7561}
1997/06/09 Slack Adjuster Has 45 Degree Elbow To Prevent Hose Rubbing {4261}
1997/06/09 Connector Has Been Replaced In The Rear Brake Oil Cooler Lines Group To Prevent Interference {5057,4257}
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