1995/03/06 Caterpillar

Jacket Water Pumps Now Include New Tapered Roller Bearings {1361}

Usage:

Caterpillar Machines Powered By 3408 And 3412 Engines

Description of Change: New tapered roller bearing water pumps are now used on 3408 and 3412 Engines. The seal contact surface of the shaft is now induction hardened which improves wear resistance at the point of seal contact. The seal material has been changed to a siliconized graphite that is more resistant to wear and less prone to deposit formation.

A new accessory drive idler shaft is used with the new water pumps. An additional hole has been added to the idler shaft to provide improved lubrication to the water pump tapered roller bearings.

Adaptable To: The new 117-4956 Water Pump Group is used on 3408 Engines. The new 117-4955 Water Pump Group is used on 3412 Engines. The new pumps can only be used on engines that have the new 117-9712 Accessory Drive Idler Shaft. The former shaft does not provide sufficient lubrication for the new pump. The new water pump groups and idler shaft are effective with 3408 (48W38946) Machine Engines, and 3412 (73W16055) Machine Engines. Engines prior to these serial ranges should be serviced with the appropriate remanufactured water pump.

Caterpillar Information System:

1995/03/06 Cracks In Phenolic Water Pump Impellers In Remanufactured Water Pumps {1364}

1995/03/06 Charge And Differential Pump Group Repair Kit Contents {4130,4134,4344}

1995/02/27 Installation Instructions For Pump Drive Coupling {3279,3252}

1995/02/27 Oscillation Shaft Now Induction Hardened {6604}

1995/02/27 Brake Assembly In Drum Drive Motors Has More Discs And Plates {4267}

1995/02/27 Reinforced Wheel Rims Available Resist Damage {4209}

1995/02/27 Repair Kit Is Now Available To Improve Seat Cushion Beading {7312}

1995/02/27 Steering Pump Has Additional Serviceable Parts {4306}

1995/02/20 New Inlet And Exhaust Valves Have Thinner Heads{1105}

1995/02/20 Returning Core Engines For Full Refund {0374}

1995/02/20 Improved Flexible Scrapers Provide More Efficient Cleaning of Drum Under All Soil Conditions{6607}

1995/02/20 Seal Kit for Steer Cylinders Contains Two Rod Seal Configurations{4303}

1995/03/06 "Narrow Flange" Cylinder Liner Available For Service Repair {1216,1201}

1995/03/13 Smaller Slot In The Neutral Start Switch Plate Increases Service Life Of Neutral Start Switch{1424}

1995/03/13 Alternator And Air Conditioner Pulley Guards Are Now Available{7168,7320,7174}

1995/03/13 New Air Cleaner Group Uses Radial Seal Air Cleaner Elements{1051,1054}

1995/03/13 New Intermediate Cylinder Assembly Is Used In The Hoist Cylinder Group{5102}

1995/03/13 List of Information Release Memos on Cat® Remanufactured Products Since July 1993{7754,0374,0376}

1995/03/20 Caterpillar Standards for Electrical Schematics{1400}

1995/03/20 New R-134a Air Conditioning For Backhoe Loaders{7320}

1995/03/20 New Wheel Rim Assembly Provides Clearance Between The Brake Caliper And Valve Stem For Inflation{4201,4202}

1995/03/20 Steering Tank Screen Is Furnace Brazed For Longer Service Life{4332,5068}

1995/03/20 Improved Tube Assemblies & Bracket Used To Prevent Leaks{4324,4304,4307}

1995/03/27 All-inclusive Electrical Schematic Listing{1400}