Parts Needed If Air Compressor Tubes Replaced{4257,1803}
Usage:
772B Tractors;
773B Trucks
Effective with engine serial number 73W9938 in 772B Tractors and 773B Trucks, a change was made to the 4N8539 Air Compressor Lines Group. A tube between the compressor and the cylinder head, and a tube between the compressor and right side of the aftercooler housing, and their fittings were replaced by hoses with a heat resistant sleeve over each hose. See illustration.
Service parts needed if either former tube is replaced.
The former tubes are canceled, but the correct replacement parts have not up to this time been furnished. The correct replacement parts are shown in the illustration.
Caterpillar Information System:
1988/12/12 New Operator Monitor Group Used{7490}
1988/12/12 Revised Instructions For Installation of New Maintenance Free Batteries{1401,1400}
1988/12/05 Operation Of Feeder Sensor Control{8216}
1988/12/05 Improved Air Conditioner Thermostat Switches Have Tin-Plated Internal Parts{7320}
1988/12/05 Hydraulic Pressure Settings For Backhoe Loaders{5050,5450}
1988/12/05 Improved Coupler Pin Helps Prevent Cylinder Rod Bending{6129}
1988/12/05 New Air Tank Drain Valve Used{4250,4272}
1988/11/28 More Charts And Decals Available For Lubrication And Maintenance Intervals {0374,0375,7500}
1988/11/28 Stronger, Longer Ring Gear Retainers For Final Drives {4054,4084}
1988/11/28 Improved Wheel And Longer Bolts Provide Better Retention Of Front Brake Disc {4255,4201}
1988/11/28 New Mounting Pin Assemblies For Blade Tip Cylinder {5106}
1988/11/21 One-Piece Tappet (Follower) Used In 11 mm (Type 2) Fuel Injectors{1290}
1988/12/12 New Switch For Back-Up Alarm{7406}
1988/12/12 New Solenoid Valve For Rotor Lift System{8245}
1988/12/12 New Mounting Bolts Used In Aftercooler Housings{1063,1058}
1988/12/12 Maintenance Procedure Extends Service Life Of Exhaust Manifold Studs{1050}
1988/12/12 New Alternator Drive Pulley Has Hardened Wear Sleeve; New Seal Used On Pulley{1425,1357}
1988/12/12 Oil Cooler Bypass Elbow Changed To Prevent Bypass Valve Seizure{1314,1318}
1988/12/19 New Material Used For Rotating Seal Rings In Some Power Shift Transmissions, Steering Clutches And Torque Converters {3101,3150,4100}
1988/12/19 Cold Weather Readiness Checks {1456,1250}
1988/12/19 New Circle Drive Gerotor Motor Groups Provide Higher Torque To Circle Drive {5082}
1988/12/19 New Brake Disc Assemblies, Axle Lubricant Reduce Brake Chatter {3278,4255}
1988/12/19 Stronger Spacers Can Be Used On Stabilizer Street Pads {6505}
1988/12/19 New Latch Used For Engine Side Doors {7263}