1996/09/30 Caterpillar

Improved Water Pump Groups Available{1361}

Usage:

All Machines Powered By 3406/3406B/3406C Machine Engines

Description of Change: Improved water pump groups are available for all machines powered by 3406/3406B/3406C Machine Engines.

Improvements to the key components of the water pump groups are:

* A unitized seal assembly (the 139-0088 Installation Tool is required).

* A dust lip has been added to the oil seal to keep debris away from the primary seal (the 138-9299 Installation Tool is required).

* A stronger, corrosion resistant, stainless steel shaft has been added.

* The cast iron impeller has been changed to improve coolant flow around the unitized seal.

* The improved housing has a cast flush channel to improve coolant flow around the seal. The weep hole is repositioned to face the block.

* The improved bearing retainer has increased hardness and improved flatness for improved bearing retention.

Adaptable To: The improved 135-4926 Water Pump Group is effective with and adaptable to all 3406/3406B/3406C Machine Engines. The improved, remanufactured 0R-8217 Water Pump Group is effective with and adaptable to all 3406/3406B/3406C Machine Engines.

The improved water pump groups are direct replacements for the former water pump groups.

Caterpillar Information System:

1996/09/30 New Governor Weight And Race Increase Durability{1264}

1996/09/30 An Improved O-Ring Seal And Proper Use Of Adapter Locks Reduces Oil Leaks{1252}

1996/09/30 Improved Sleeve Metering Fuel System (SMFS) 8.5 mm (.34 in) Fuel Pump Plunger Eliminates Plunger And Sleeve Scuffing{1251}

1996/09/30 New Margin Spring In Pressure Compensator Valve Provides Stable Pressure Setting For Implement Pump Groups{5070,5055,5086}

1996/09/30 Original 8R-1284 Lining Kit and 8R-1286 Shoe Assembly Is Recommeded When Servicing Articulated Truck Brakes{4253,4254}

1996/09/30 Window Slider Kit Is Now Available To Update Cab Window In The Right Hand Door Group{7310,7308}

1996/09/30 Shims Now Used In Front Suspension Groups To Increase Upper Suspension Cylinder Bearing Life{7201}

1996/09/30 Service Repair Splined Boom Foot Pins Available For 416B Through 438 Backhoe Loaders{6506}

1996/09/30 Sleeve And Cover For Radio Opening Now In Production Improve Headliner Appearance{7300,7338}

1996/09/30 Belt Tensioner Adjustment Shims Eliminated; Tensioner Bracket Changed To Compensate for Removal Of Shims{4197}

1996/09/30 Extended Life Coolant (ELC) Used In Cooling System{1395}

1996/09/30 Caterpillar Coolant Conditioner Now Standard{1352}

1996/10/07 Service Manual Module Revisions Available {0374}

1996/10/07 New Material Used In Front Wheels To Increase Service Life {4201,4200,4208}

1996/10/07 New Boot For Pilot Valve Group Improves Lever Movement For Hoist Control {5059,5136}

1996/10/07 New Temperature Sensors Used To Monitor Oil Temperature In The Differential Housing {7601,3067}

1996/10/07 New Hoist Rotary Switch Assembly Used To Increase Reliability {1400}

1996/10/07 Special Instruction SEHS9983 Available For Installation And Adjustment Of Truck Body {7258}

1996/10/07 New Fuse Cap Available {1417}

1996/10/07 Effectivity Of Upgrades To Remanufactured Transmissions, Torque Converters And Wheel Assemblies {3001,4051}

1996/10/07 Parts Manuals May List Air Conditioning Compressors Incorrectly {1802,1809,7320}

1996/10/14 Improved Alternator Adjustment Strap And Retention Hardware Used To Maintain Belt Tension {1405}

1996/10/14 New Poppet Valve Group Used In Lines Relief Valve Groups To Prevent Excessive Implement Drift {5117}

1996/10/14 Quieter Operating Check Valve Used In Tank Return Line {5067,5129}