Air Compressor Piston Now Has Five Ring{1806}
Usage:
D9H Tractors;
D44, D550, D550B Articulated Trucks;
631D, 631E, 631F, 633D, 637D, 637D, 637F, 639E, 651E, 657E Scrapers;
768, 768B, 768C, 772B Tractors;
769, 769B, 769C, 771C, 773B, 775B Trucks;
PR-450C Pavement Profilers;
The 7N-4837 Piston Assembly used in air compressors on the above machines has been changed from a three ring piston to a five ring piston. The part number of the piston has not changed because the three ring and five ring pistons are interchangeable. The new five ring piston will provide improved oil control. The 110-1337 Ring Kit provides the five rings required on the new piston.
Caterpillar Information System:
1995/09/18 Electronic Control Module (ECM) Has Improved Features{3225,1901,7451}
1995/09/18 Flange Assembly And Body Assembly For 103-4891 Implement Gear Pump Group Now Serviced {5073}
1995/09/18 New Link Assemblies And Tie Rod Clamp Assemblies With Changed Torque Specifications {4318,4329}
1995/09/11 New Exhaust Valve With Tapered Stem Used In Engine Cylinder Head Groups {1105}
1995/09/11 Software Improvements For EPTC II Controls On Tractors, Trucks, And Wheel Tractor-Scrapers {3168,3150}
1995/09/11 Improved Prelube Pressure Switch Available {1400,1435,1319}
1995/09/11 New Guard Assembly Used In Refrigerant Compressor Groups {1802}
1995/09/11 Transmission Oil Filter Change Interval Increased {3179}
1995/09/11 Transmission Neutralizer Switch Can Be Adjusted To Adapt To Different Operating Conditions {4274,3168,3418,4265}
1995/09/11 Pressure Reducing Valve Has Been Removed From Retarder Control Group To Improve Retarder Response {3122,3120}
1995/09/11 Ground Body Bolts And Locknuts Improve Retention Of The Aluminum Gear In The Circle Drive Groups {5207}
1995/09/04 5P-8665 Liner Puller Group Changed To Accommodate Cylinder Liner With Larger Diameter Top Flange{1216}
1995/09/18 New Stronger Engine Lifting Eye Bracket Used{1122}
1995/09/18 New Engine Water Pump Groups Include New Seal Group{1361}
1995/09/25 The 1R-0750 High Efficiency Fuel Filter Assembly Available For 3306 Engine{1254,1261}
1995/09/25 New Engine Water Pump Elbow and Seal Resists Compression Set and Abrasion{1361}
1995/09/25 PTO Lube Pressure Test Fitting Available{3107}
1995/09/25 Hose Has Been Added To The Brake Control Group To Increase The Service Life Of The 6G-8425 Control Valve Group{4257,4267}
1995/09/25 Pump And Motor For The 106-4151 Electric Drive Pump Group Now Serviced Seperately{4324,4325}
1995/09/25 Components Of The 3Z-3731 Lincoln Lubrication System Now Serviced Separately{7509}
1995/09/25 Bolt Tightening Specifications For Engine Auxiliary Drive Pulley Group{1205,1207}
1995/09/25 Improved Bolt Retention On Differential Carrier To Axle Housing Bolted Joint{3260,3284}
1995/09/25 Replacement Knob Now Available For Sonic Feeder Control Sensors{5643}
1995/09/25 Pump Conversion Required for Replacement of Water Spray Pump{5612}