1996/02/19 Caterpillar

New Material Used In O-Rings And Optional New Block Side Cover Replacement{1201}

Usage:

3406, 3406B, 3406C, 3408 And 3412 Machine Engines

Description of Change: A new material is being used for all the straight thread O-ring plugs used on both sides of the cylinder block. The new O-ring material has a longer service life than the former O-ring.

On the 3406, 3406B and 3406C an optional new, stronger cover can be used whenever the fuel injection pump is removed if there is an indication of leakage. The optional new cover is made of steel and has a groove for an O-ring instead of the former aluminum cover and gasket.

Adaptable To: Chart A identifies the new and former straight thread O-rings and Chart B identifies the new and former cover and gasket/seal.

Typical view of the straight thread O-ring Seals (1), and the production aluminum cover (3) and the production gasket (2).

Caterpillar Information System:

1996/02/19 New Bolts And Washers Used In Rear Axle Spindle To Rear Axle Joint Provides Additional Strength To Prevent Bolt Breakage{3260}

1996/02/19 Use Of BIO HYDO Oils in Off-Highway Trucks{3022}

1996/02/12 Closed Engine Crankcase Breather System Maintenance And Repair {1317,1107}

1996/02/12 New Components Used In Governor And Fuel Pump Drive Group{1288}

1996/02/12 New Pressure Switch Assembly Is Available For Fuel Applications; 9G-8011 Pressure Switch Assembly Should Not Be Used In Fuel Applications {7414}

1996/02/12 Replaceable Drawbar Wearplate Eliminates Wear On Support Assembly{7105,7119}

1996/02/05 Lubricant Used On Cylinder Head Bolts Changed{1100}

1996/02/05 Fuel Injector Sleeve Replacement Tooling{0703,1125}

1996/02/05 New Duo-Cone Seal Retainer And Backing Plate Reduces Oil Leaks In The Service And Parking Brake Group{4251,7561}

1996/02/05 New Stronger Drawbar Reduces Deformation In Severe Loading Situations{7105,7119}

1996/01/29 New Hose Assemblies Used In Turbocharger Oil Lines Groups {1307}

1996/01/29 Solenoid Valve Group Now Available For Load Valve Group {5472}

1996/02/19 New Brackets Help Prevent Damage To Engine Fuel Injection Lines Groups{1252}

1996/02/26 Service Manual And Service Kits Available For Engine Variable Speed Fan Clutch{1359}

1996/02/26 Magnetic Plug Now Used On Front Wheels{4208}

1996/02/26 New Rubber Belt Step Available{7254}

1996/02/26 New Hoist Valve Reduces Leakage{5136}

1996/02/26 New Troubleshooting Guide Is Needed To Test The Grade/Slope System{7219,7569}

1996/02/26 New Engine Cylinder Head Injector Sleeve Used In Both Mechanical Unit Injection (MUI) And Hydraulic Electronic Unit Injection (HEUI) Engines{1125}

1996/03/04 Ring Seals No Longer Required At Six Locations In Turbocharger Groups{1052}

1996/03/04 New Interaxle Differential Groups Have New Thrust Discs For Improved Service Life{3258,3287}

1996/03/04 Dimensions For Radio Installation {7338}

1996/03/04 Flash Programming Capability Is Required{1901,1902}

1996/03/11 New Transmission Input Shaft Seal Prevents Leakage{3189,3401}