1995/08/14 Caterpillar

New Piston Crown Assembly Used In Piston And Rod Group{1214}

Usage:

D11N (4HK, 74Z) Track-Type Tractors;
776B (6CJ),
776C (2TK),
784B (5RK) Tractors;
777B (4YC),
777C (4XJ),
785 (8GB),
785B (6HK),
789 (9ZC),
789B (7EK),
793 (3SJ),
793B (1HL) Trucks;
994 (9YF) Wheel Loaders;
5130 (7TJ, 5ZL),
5230 (7LL) Excavators

Reference: Service Magazine; October 31, 1994; Page 12; "New Piston Crown Assembly Used In Piston Group".

Description of Change: A new piston crown assembly is used in the piston and rod group in the 3500 Machine Engines in the above machines. The new piston crown assembly includes new bearings. The "clinch joint" of the new bearing is located in a different position than on the former bearing. When installed, the "clinch joint" in the new bearing will be in a location of lower piston crown stress.

Adaptable To: The new 121-0463 Piston Crown Assembly is a direct replacement for the former 114-0382 Piston Crown Assembly in the 6I-2861 Piston And Rod Group. The former piston crown assembly is canceled.

NOTE: The oil requirements are the same for both the new and former piston crown assemblies, but the oil specifications for North America have changed from API CF-4 to CG-4. Therefore, use a CG-4 oil in North America and use a CF-4 oil outside North America if Caterpillar DEO oil is not used. These oils will help reduce the tendency for carbon build up in the piston ring grooves. Both "CE" and "CD" specification oils are NOT acceptable for use with these pistons.

Caterpillar Information System:

1995/08/14 Wear Sleeve Removal Tooling May "Mark" The Crankshaft{1202,1161}

1995/08/14 New Exhaust Manifold Group Helps Prevent Exhaust Manifold Cracking{1059}

1995/08/14 New Indicator For Hydraulic Charge Filter Prevents Leakage{5068}

1995/08/14 Parts Service Information For Articulated Trucks Equipped With Wide Gears In The Final Drive And A Spacer Between The Wheel Assembly And Planetary Carrier{4055,4051}

1995/08/14 New Components In Water Lines Groups And Aftercooler Group Allow Field Installation Of Variable Speed Fan Clutch Vital Information Management System (VIMS){1380,1063,1359}

1995/08/14 Hood Grill Improved With Enlarged Inserts{7251}

1995/08/14 New Axle Sustains Higher Dynamic Loads{3282}

1995/08/14 Reattaching Grommets To 3E-9167 And 3E-9170 Machine Performance Panels{7490}

1995/08/07 Injector Solenoids on Engines Equipped with EUI Are Not Polarity Sensitive{1259}

1995/08/07 Improved 1U-7430 Front Crankshaft Seal Installer Available{1160}

1995/08/07 Selecting The Correct Turbocharger, Wastegate Orifice, And Personality Module For 3500 Engines Used In 793B Trucks{1052,1057,1902}

1995/08/07 Selecting The Correct Turbocharger And Wastegate Orifice For 3500 Engines Used In 793 Trucks{1052,1057}

1995/08/14 Piston Usage Chart For Two Piece Pistons{1214}

1995/08/14 Remanufactured 3500 Engine Core Return Requirements{1000}

1995/08/21 Low Friction Wear Ring Is Available For The Front Suspension Cylinders To Help Reduce Vibration{7201}

1995/08/21 Driveshaft Dust Cups Now Serviceable{3253}

1995/08/21 Improved Level Switch Available{7422}

1995/08/21 Recommendations For Inspection And Replacement Of Rubber and Viscous Crankshaft Dampers{1205}

1995/08/21 New Service Repair Camshaft Idler Gear Shaft Available For Use With Cylinder Blocks With Damaged Pilot Bore{1206,1212,1237}

1995/08/28 New Cylinder Head Group Includes Stronger Cylinder Head{1100,1101}

1995/08/28 New Steering Accumulator Charging Valve Group Is Being Used To Improve Service Life{4307}

1995/08/28 Special Instruction SEHS9879 Available For Installing An Air Cooling Coil For The Air Dryer On Articulated Trucks {4285}

1995/08/28 Adding Vibratory Lock Out Function In Vibratory System{1435,3220,5653}

1995/08/28 Modifying Former Exhaust Manifold Sections To Help Prevent Loosening Or Breakage Of The Exhaust Manifold Retaining Bolts{1059}