A Complete Tire Valve Group Must Be Ordered For Parts Replacement Of A Tire Valve Body{4202}
Usage:
621B, 623B, 627B, 641B, 651B and 657B Tractors
Description of Change: A complete tire valve group must be ordered for parts replacement of a damaged tire valve body for the above models. If the valve body is damaged, the core is probably damaged. To make sure the valve will operate correctly, install the complete valve group.
Adaptable To: All 641B, 651B, 657B, 621B, 623B and 627B Tractors as shown in the chart which follows.
Caterpillar Information System:
1980/01/21 New Piston Groups Have The Piston Pin Bore Off-Center, Away From The Thrust Side Of The Piston{1214}
1980/01/21 Support Blocks Are Now Available For The Ends Of The Equalizer Bar{7206,7209}
1980/01/21 Adjustable Spanner Wrench For Screw-On Pistons In Ripper Lift And Blade Tilt Cylinders{0614,5100,5350}
1980/01/14 Use The FT1481 Bracket To Hold The 1P2371 Micrometer In Position During Bore Size Measurement{0655,0663}
1980/01/07 6V2091 Tap Available For Repairs On Spiralock Threads For Bevel Gear And Steering Clutch Case {0611,4059}
1980/01/07 Improved Ring Seal Used At Rear Of Crankshaft {1161}
1980/01/07 New Stronger Hub For Torque Converter Impeller Is Made Of Nodular Iron {3101}
1980/01/07 New 6V114 Gauge Assembly Available To Measure Brake Drum Wear {0653,4252}
1980/01/07 Improved Pivot Pin Assemblies Now Used Between End Of Steering Cylinder And Gooseneck {4303,6209,7107}
1980/01/07 Important: XT3 And XT5 Hose Assemblies Must Be Fabricated And Installed Correctly For Maximum Service Life {5057}
1980/01/07 Different Steering Cylinder Hose Prevents Failures {4304}
1980/01/07 Fuel Heaters Are Now Available For Field Installation {1296}
1980/01/21 New Hose Assemblies Used For Supply Lines To Elevator Motor{5057,5314}
1980/01/21 Longer Bolts And Spacers Now Used In Service Brake Groups{4256,4251}
1980/01/21 Drain Holes Added To Roof Panel And Channels On ROPS{7323}
1980/01/21 A Different 45° Elbow Is Now Used In Transmission Control Group{3166,3156}
1980/01/21 New Fuel Injection Nozzle Assembly Used{1254}
1980/01/21 New Brake System Has Larger, Stronger Caliper Heads With Improved Pistons And More Lining Surface Area{4250,7000}
1980/01/28 Forward Warning Horns Now Connected To Low Air Pressure Horn In Operator's Compartment; Override Switch Can Be Installed{7400,7450,7408}
1980/01/28 Stronger Control Lever Used In Valve Control Group (Position) For Bowl And Apron Control{5063}
1980/01/28 New 6V199 Socket For Use On Fasteners In Areas With Limited Clearance{0612}
1980/01/28 Installation Procedures For 5N5880 Remote Shut-Off Group And 5N6336 Oil Pressure Indicator Gauge Group{7418,7403,7455}
1980/01/28 Three Screens Keep Debris Out Of Hydraulic System{5076,5056}
1980/01/28 Hose Assembly Now Used In Hydraulic Lines And Valve Group{5057,5069}