1985/05/13 Caterpillar

Preventing Transmission Manual Switch Failures{3168}

Usage:

768C ( 2X1-349 ),
772B ( 64W1-167 ),
776 ( 14H1-205 ) Tractors;
769C ( 1X1-2876 ),
773B ( 63W1-1220 ),
777 ( 84A195-1283 ) Trucks

Reference: "Modification Of Transmission Control To Prevent Loose Mounting Bolts And Manual Switch Failures", Service Magazine, May 17, 1982, Page 1.

The above article outlines the steps necessary to keep water and dirt out of the transmission manual switch of the above machines. By fabricating a protective plate for the bottom of the shift console, and covering the console during cleaning, many switch failures can be prevented.

Many times the failure of other components is blamed on the 9D8587 Manual Switch. Wear or misalignment of the pinion, bearing or gear can give a false indication of a faulty switch. These three components should be checked before a manual switch replacement is made. See the illustration.

These tips should improve the service life of the manual switch and reduce unnecessary replacements.

Location of pinion, bearing and gear.

Caterpillar Information System:

1985/05/13 Hydramechanical Governor Fuel Setting Information{1289,1250}

1985/05/13 New Piston Seal For 139.7 mm (5.50") Hydraulic Cylinders{5456,5457,5104,5458}

1985/05/06 Remanufactured Fuel Ratio Controls Are Available In U.S. And Canada{1278,7754}

1985/05/06 Be Sure Correct Piston Rings Are Used On 3400 Series Engines{1215,1214}

1985/05/06 New Bolt And Seal For Brake Make-Up Oil Tank{5056}

1985/05/06 System To Find Internal Fuel Leakage{1250}

1985/05/06 Folded Core Radiators Used In Cooling Systems{1353,1350,1351}

1985/05/06 New Bearing Housings Available For Turbochargers{1052,1053,1056}

1985/05/06 New Battery Cable Crimping Die Available{0600}

1985/05/06 Installation Instructions For New Magnetic Switch{1408}

1985/04/29 New Lever Available For Exhaust Piping Group{1061}

1985/04/29 Snubber Used To Protect Fuel Pressure Switch{1274}

1985/05/13 Improved Radiator Cores Available{1350,1353}

1985/05/13 Check For Interference Between Water Temperature Regulator And Cylinder Head Bore{1355}

1985/05/20 New Spark Resistant Air Starting Motor Group Has Serviceable Parts{1451}

1985/05/20 Make Sure Back-Up Alarm Switch Is Correctly Installed{7406}

1985/05/20 New Temperature Recorder Group (Crayons) Indicate Surface Temperature{0776}

1985/05/27 Rebuilt Axial Piston Pumps{5070}

1985/05/27 Remanufactured Bare Cylinder Heads (U.S. And Canada){1101,7754}

1985/05/27 Identification Of Track Motor Universal Joint Assemblies{3251,3201,5058}

1985/05/27 Low Charge Indicator Added To Rear Suspension Cylinders{7213}

1985/05/27 Use Caterpillar 6V50 Engine Timing Indicator For Accurate Readings{0782,0785,0775}

1985/05/27 Obtaining Correct Bolt Torque On Ground Engaging Tools{6800,7553}

1985/05/27 Additional Repair Parts Available For Fire Suppression Actuators{7400,7401}