1999/02/22 Caterpillar

Use Special Care With 143-3629 O-Ring Seals {1071}

Usage:

793 (3SJ),
793B (1HL),
793C (4AR) Off-Highway Trucks

Reference: Service Magazine; June 23, 1997; "Improved Turbocharger Air Lines Group Reduces Boost Leaks"

The 143-3629 O-Ring Seal was announced in the Reference Article. This O-ring seal is used on the air lines between the turbocharger air outlet and the aftercooler air inlet on the 3516 and 3516B Engines in these trucks. This black, 76.5 mm (3 in) diameter O-ring seal looks and feels like other Caterpillar O-ring seals made from nitrile rubber, but, the 143-3629 O-Ring Seal is made from Kalrez®, a very special heat resistant material needed in this application. The 143-3629 O-Ring Seal is much, much more expensive than similar Caterpillar nitrile O-ring seals. As a result, dealers and customers should handle and install the 143-3629 O-Ring Seal carefully to avoid accidental loss, or damage to the seal.

Caterpillar Information System:

1999/02/22 Production Process Change Eliminates Anti-Rotation Retaining Pin In Rear Wheel Station For Certain Off-Highway Trucks {4208,4234}

1999/02/22 Improved Steering Spherical Race Bearing Available {4303,4300}

1999/02/22 Supplement To Correct Torque Specifications On Differential And Bevel Gear {3258,3270,3281,3283,3284}

1999/02/15 New Actuator Motors Available for Power Screed Options {6640}

1999/02/15 Emulsion System Changes {5615}

1999/02/15 Purging Lines Have Been Added To Conveyor Lines Group {5264,5643,6631}

1999/02/15 Filters On X-Series Machines {1054,1308,1261,5068}

1999/02/15 Proper Throttle Line Servicing Procedure {1269}

1999/02/15 New Brake Disc Wear Specifications {4250}

1999/02/15 New Thrust Washer Improves Service Life Of Differential Group {3258}

1999/02/15 Correction To Operation & Maintenance Manual SEBU6955 {0374,0375,7560}

1999/02/15 Bolts, Washer, And Spacers Grouped Into Fastener Groups In Engine Cylinder Head Groups {1100}

1999/02/22 Vibratory Relief Pressure Increased To Shorten Vibratory Start And Stop Times {5652}

1999/02/22 New Scraper Available For Asphalt Compactors {6607}

1999/02/22 3116 Engine Oil Capacity {1326}

1999/02/22 PS-360B Tires {4203}

1999/02/22 Correction To Service Brake Disc Information {4250,4255,7473}

1999/02/22 New Improved Tow Point Roller Design Now Being Used {6600}

1999/02/22 New Radiator And Oil Cooler Mounting Configuration {1350}

1999/02/22 Shielded Metal Arc Welding And Flux Cored Arc Welding Information {0679}

1999/03/01 Stronger Floatpin Design Available{5102,7120}

1999/03/01 Fan Pulley/Adapter Changes Summarized{1356,1384,1359}

1999/03/01 Special Instruction, REHS0103-01, Available For Procedure For Dynamometer Test For Power Take-Off{3107}

1999/03/01 Supplement To Correct Manual Modulation Pedal Adjustment{3059,3071}