1996/09/16 Caterpillar

New Lift Cylinder Group Uses Piston For Internal Stop {5102,7562}

Usage:

446 (6FX),
446B (5BL) Backhoe Loaders

Description of Change: A new lift cylinder group uses a new piston to provide a reliable stop for the cylinder rod at full retraction. In the former cylinder group, a piston retaining bolt provided the stop. The retaining bolt could loosen during high impact loading.

Adaptable To: The new 125-7895 Lift Cylinder Group is a direct replacement for the former 111-7712 Lift Cylinder Group. The new lift cylinder group is effective with 446B (5BL500-824) Backhoe Loaders.

New 125-7895 Lift Cylinder Group (A) and new piston (1). Former 111-7712 Lift Cylinder Group (B) and former piston retaining bolt (2).

NOTE: Earlier 446 (6XF1-Up) and 446B (5BL1-499) Backhoe Loaders using 9T-2297 Lift Cylinder Groups can be updated - if both 9T-2297 Lift Cylinder Groups are replaced with new 125-7895 Lift Cylinder Groups.

The 9T-2297 Lift Cylinder Group has a smaller diameter cylinder rod compared with the cylinder rod in the new 125-7895 Lift Cylinder Group.

NOTE: If only one 9T-2297 Lift Cylinder Group is replaced, uneven loading and cylinder speed will occur.

Caterpillar Information System:

1996/09/16 Rotated Extension Stick Cylinder Protects Cylinder Port {5057}

1996/09/16 Brake Components Resized To Improve Heat Capacity {4250,4251}

1996/09/16 New Transmission Bearing Improves Surface Fatigue Life {3030}

1996/09/09 A Chamfer Has Been Added To Some Engine Cylinder Head Bolt Holes To Help Reduce Stress Concentrations And Prevent Cracks{1101}

1996/09/09 Do Not Wash Hot Fuel Injection Pump With Cold Water{1251}

1996/09/09 A New Seal For Brake Piston Plug In Front Brake Groups (Caliper Disc) Has Been Released For Service Repair{4251,7555}

1996/09/09 New Plate Used For Tightening Fan Belts Which Use Alternator Assembly Belt Tighteners{1400,1358,1357}

1996/09/09 New Parts Available To Eliminate Wear Between The Oil Cooler Bonnet And The Elbow{1378,1380}

1996/09/09 Engine Block Provides Improved Grounding To Frame Grounding Cable{1201,1405,1406,7423}

1996/09/09 Machine Electronic Control Module Software Improvements{0700,0785,1901}

1996/09/02 Improved Starter Solenoid Assemblies Available {1467,1518}

1996/09/02 New Start Switch With Improved Moisture Resistance {1416}

1996/09/16 New Hinged Window Used In Right Front Side Of Operators Cab Allows Increased Air Circulation {7310}

1996/09/16 Snap Ring Retains Rod Wiper Seal In Several Hydraulic Cylinder Groups {7562,4303,5102,5104,5105,5106,5108,5141,5303,5352,5356,5452,5457,5458,5468,5555}

1996/09/16 Vibration Resistant LED Kit Available For Use With Back-Lit Rocker Switches {1429}

1996/09/16 New Plastic Outlet Sleeve Used On 3208 Engines {1380}

1996/09/16 New Hold-Down Bolts For The Sleeve Metering Fuel System (SMFS) Governor Housing {1251}

1996/09/16 Caterpillar High Efficiency Fuel Filters Help Provide Maximum Fuel Pump And Fuel Injector Life {1261}

1996/09/23 Improved Radiator Shunt Hose Routing/Fittings Allows Common Hose{1380}

1996/09/23 Improved Air Compressor Bracket Eliminates Excessive Clearance{1803}

1996/09/23 New Wheel Assembly Used To Improve Service Life{4208}

1996/09/23 Fittings (Grease Relief) Should Be In Place When Front Suspension Group Is Charged With Nitrogen{7201}

1996/09/23 Orifices Available to Adjust Steering Times{4307}

1996/09/23 Procedure And Maintenance Interval For Cleaning Transmission Suction Screen And Magnetic Screen Tube Assembly{3030,7526}