1988/12/26 Caterpillar

Cylinder Block To Aftercooler Connectors {1063,1201}

Usage:

D11N, 776B Tractors, 777B, 785, and 789 Trucks

There have been cases where incorrect parts have been used for the vertical connector between the cylinder block and the aftercooler during field repairs of the above models. The D11N Tractor uses jacket water aftercooling with an open connector between the coolant passage in the cylinder block and the aftercooler. The 776B Tractor, 777B, 785, and 789 Trucks use a separate circuit aftercooling system and a connector that has a float valve between the cylinder block and the aftercooler. The float valve allows air to be vented out of the block while filling the cooling system but it is closed and keeps the two systems separate while the engine is running. Also, the float valve will allow the aftercooler to drain when the cylinder block is drained.

If the open connector is used in a 776B Tractor, 777B, 785 or 789 Truck, this will allow mixing of the jacket and aftercooler water and can raise the aftercooler water temperature with low engine power complaints. Be sure to use the correct type of connector when repairing or rebuilding any of the above models.

Caterpillar Information System:

1988/12/26 New Coolant Flow Switch Available {7422,7425}

1988/12/26 New Governor Control Cable Used {1265}

1988/12/26 Be Sure Breathers Are Connected When Winches Are Installed {5163}

1988/12/26 Shorter Bolts Used For Bolt-On Cutting Edges {6801}

1988/12/26 Improved Boom Cylinder Lines {5057,5456}

1988/12/26 New Gas Cylinder Used In Operator's Console {7451}

1988/12/26 Check Bore Length Of Gear And Sleeve Before Assembling In Transmission {3061}

1988/12/26 Enlarge Lower Hook Openings On Three-Point Hitch Quick Coupler Group {7120}

1988/12/26 Check Load Height Before Transporting Machines {7500}

1988/12/26 New Muffler And Pipe Used; Low Idle Increased {1061,1062,1264}

1988/12/19 Twelve Bolts Used In Drum Support Bearing Retainer {8227}

1988/12/19 Operation Of Differential Lock {3264}

1988/12/26 Procedure To Replace Studs In Bottom Wear Plate On VIP Screeds {8225}

1979/01/08 Check The Adjustment Of The Original Tachometer Before A New Tachometer Is Installed{7462}

1979/01/08 A New 6V29 Sleeve Metering Fuel System Pump Roll Pin Tool Is Used To Adjust And Make A Replacement Of Roll Pins In The Fuel Injection Pump Housing{0626}

1979/01/08 New 6V87 Gauge Measures Valve Stem Wear{0653,1105}

1979/01/15 5P9705 Tapered Rod Tool Group Used For Removal And Installation Of Piston Pin Bearings In Tapered Connecting Rods{0622,1214,1218}

1979/01/15 Removal And Installation Of Taper Type Bearings{0622,1214,1219}

1979/01/15 6V83 Emery Polishing Paper{0675}

1979/01/22 Current Chart For Dynamometer Adapters{0651,1000}

1979/01/22 Ether Starting Aid Groups Are Now Available{1456}

1979/01/29 Fuse And Wire Assembly Is Available For Protection Of Earlier 6N5906 Service Meters{7480}

1979/02/05 Federal Law Prohibits Tampering With Noise Control Systems{0116}

1979/02/05 Circle Segments Are Now Available To Make Repairs To Circles That Have Cracked Or Broken Teeth{6154}