1997/09/08 Caterpillar

3406C Pump And Governor Changes Provide Improved Oil And Fuel Leak Resistence{7555}

Usage:

All Caterpillar Machines Powered By 3406B And 3406C Engines With The New Scroll Fuel System (NSFS)

Description of Change: A new O-ring seal and new gaskets are made with materials that are capable of resisting higher temperatures. As a result, the improved O-ring seal and gaskets can provide greater resistance to oil and fuel leaks in the pump and governor.

Adaptable To: Chart 1 lists the new and former O-ring seal and gaskets that are contained in the governor and fuel injector pump group of all Caterpillar Machines powered by 3406B and 3406C Engines with the New Scroll Fuel System (NSFS).

The improved O-ring seal and gaskets are effective with serial number 41Z6538-Up and are adaptable to first production of all Caterpillar Machines powered by 3406B and 3406C Engines with the New Scroll Fuel System.

Illustration 1: 3406C Governor Group. (B) Rear view.

Illustration 2: View Of Section A-A From Illustration 1. (1) 144-0479 Gasket.

Illustration 3: 3406C Governor And Fuel Injection Pump Group (C) Side view. (D) Rear view. (2) 144-0481 Gasket. (3) 8J-4351 O-Ring Seal. (4) 144-0478 Gasket. (5) 144-0480 Gasket.

Illustration 4: 3406C Fuel Injection Pump Group (E) Front view. (6) 144-0482 Gasket.

Caterpillar Information System:

1997/09/01 Improvement Provides Better Sealing For Unit Injectors {1290}

1997/08/25 New Parts Manual Format Used For Certain Caterpillar Products{0374}

1997/08/18 "Date Updated" Displayed In Parts Manuals On The Service Information System (SIS) {7567}

1997/08/18 Use Separate Sampling Pump For Oil and Coolant {7542,7577}

1997/08/18 Lubricity Limit Added To Preferred Distillate Fuel Recommendation {1280,7568}

1997/07/28 Protection Of Unsealed Electrical Terminations For Machines Used In Corrosive Applications{1400}

1997/07/28 Required Maintenance Of Air Cleaner Dust Valves{1050,1051,1055,1068}

1997/07/07 Governor Control Cover Assembly Includes New Seal And Improved Cover {1264}

1997/07/07 Revised Special Instruction, SEHS9160, "Replacing The Spacer On The Cutter Wheel And Changing The Height Dimension Of The Cutter Wheel On tTe 4C-5084 Oil Filter Cutter" Is Available {0678,1261,1308,3004,3067,4070,5068,5092,5177}

1997/06/30 Certain Publications Are Now Printed On Demand {0374}

1997/06/30 Dealer PC Hardware Purchase Recommendations For All Caterpillar Applications {7600,7601,1920}

1997/06/23 Improved 2-Pin Deutsch® DT Connector Now Used {7553}

1997/09/29 Handling Instructions For Water Pumps{1361}

1997/10/06 Service Charts And Decals Available{0374,0375}

1997/10/06 Proper Welding Procedure On Machines And Engines With Electronic Controls{1400}

1997/10/13 Possible Downloading Problem When Truck Payload Measurement V8.0 Is Used With Windows '95{7494}

1997/10/13 Follow Guidelines When Cleaning And Storing Friction Discs To Improve Service Life{3187}

1997/10/20 Service Interval Change For Extended Life Coolant Extender And Extended Life Coolant{1395,7543,7545}

1997/10/27 Significant Improvement For Pump Impellers (Water Pumps){1364}

1997/10/27 History Of Pump Impeller (Water Pump) Changes{1364}

1997/11/03 Proper Welding Procedure On Machines And Engines With Electronic Controls {1400}

1997/11/10 Handling Instructions For Water Pumps {1361}

1997/12/22 Thicker Head Gasket Available For Cylinder Block Salvage Procedure {1124}

1997/12/22 Dry Lubricant Recommended For Use On Door Linkages, Door Seals, And Window Latches {7308}