1980/02/04 Caterpillar


Change To Gear On Accessory Drive Shaft Assembly Gives Longer Service Life{1207,1206}

Usage:




D9H, DD9H Tractors;
594H Pipelayers;
D353E Industrial and Marine Engines

Description of Change: A new gear, with a .001" (0.03 mm) larger bore than the former gear, is used on the accessory drive shaft on the above models. The larger bore in the new gear permits installation on the shaft after the gear is heated to 500°F (260°C). Formerly, the gear had to be heated to 600°F (316°C) before installation. The use of less heat to install the gear gives harder teeth after installation. The result is less pitting of the gear teeth and longer service life.

Adaptable As: The new gear and/or new accessory drive shaft assemblies are direct replacements for the former parts as shown in the chart.

Caterpillar Information System:

1980/02/04 New Cylinder Liner Has Improved Design To Keep Liner Temperatures Lower{1216}
1980/01/28 Oil Drain Hole Added To Spacer Plate Cylinder Block To Permit Use Of Scroll Fuel System{1201,1221}
1980/01/28 New Attachment Air Compressor Group and Lines Groups Have Improved Design{1065}
1980/01/28 Installation Procedures For 5N5880 Remote Shut-Off Group And 5N6336 Oil Pressure Indicator Gauge Group{7418,7403,7455}
1980/01/28 New 6V199 Socket For Use On Fasteners In Areas With Limited Clearance{0612}
1980/01/21 New Fuel Injection Nozzle Assembly Used{1254}
1980/01/21 Extended Shafts Now Available For Front Power Takeoff Units{3055}
1980/01/21 Cooling System Improvements Prevent Expansion Tank Leakage{1354,1380,1153}
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 A Spring With A Lower Rate Is Now Used In The Fuel Filter Group To Give Less Fuel Pressure{1261}
1980/01/14 New Raw Water Engine Oil Cooler Is Used{1378}
1980/01/14 Use The FT1481 Bracket To Hold The 1P2371 Micrometer In Position During Bore Size Measurement{0655,0663}
1980/02/04 Real Value Available Through Caterpillar Remanufacturing Programs{0374}
1980/02/11 Warning: Avoid Use Of Fuel Mixtures Of High Volatility. If You Are Exposed To Such Mixtures, Be Aware Of The Hazards Involved And Take Proper Precautions{1280}
1980/02/11 Use The Correct Water Temperature Contactor{1350,1100}
1980/02/25 How To Check Operation Of Hydramechanical Shutoffs On D379B, D398B, D399 Engines{7418}
1980/02/25 Revision Of Special Instruction Form No. SMHS7267, "Use Of 5P8709 Tool Group For Alignment Of Piston Cooling Jets" Has Important Changes{1307}
1980/02/25 Stronger Braces Used Between Air Cleaner And Engine{1051}
1980/02/25 Plunger Movement Must Be Adjusted When New Rack Shut-Off Solenoid Is Installed{1259}
1980/02/25 Drawings Available For Six Tools Used During Repairs Of Damaged Pin Bores In Two-Piece Booms{6501,0665}
1980/02/25 Identification Of Fuel Injection Lines And Nozzle Bodies For Different Combustion Systems{1252,1254}
1980/03/03 Spacer Plate Block Group Used For Parts Service Of Block Group With Counterbore Design{1101,1201}
1980/03/03 Connecting Rod Changes And Replacement Information{1218}
1980/03/03 Fuel Heaters Are Now Available For Field Installation{1296}
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