1988/12/19 Caterpillar

New Axle Differential Group Used {3258}

Usage:

D25C, D30C, D350C, D35C, D35HP, D400 Trucks

Description of Change: A new differential group is used on the above articulated dump trucks. The new group has larger, stronger spider and pinion gears to resist failures from sudden impact loads experienced during wheel spin. The new differential group also has coated steel bushings to improve lubrication and reduce wear between the spider and pinion gears.

Adaptable As: The 9C9772 Differential Group is a direct replacement for the former 6W5115 Differential Group which was installed in the trucks listed in Chart A.

Earlier trucks, listed in Chart C, used a 5V1271 Differential Group that had the same size bearing diameters on both ends of the differential case assembly. The 5V1271 Differential Group can be replaced with the new, stronger and larger differential components by ordering the parts lists in Chart B.

Caterpillar Information System:

1988/12/19 New Latch Used For Engine Side Doors {7263}

1988/12/19 Stronger Spacers Can Be Used On Stabilizer Street Pads {6505}

1988/12/19 New Brake Disc Assemblies, Axle Lubricant Reduce Brake Chatter {3278,4255}

1988/12/19 New Circle Drive Gerotor Motor Groups Provide Higher Torque To Circle Drive {5082}

1988/12/19 Cold Weather Readiness Checks {1456,1250}

1988/12/19 New Material Used For Rotating Seal Rings In Some Power Shift Transmissions, Steering Clutches And Torque Converters {3101,3150,4100}

1988/12/12 Oil Cooler Bypass Elbow Changed To Prevent Bypass Valve Seizure{1314,1318}

1988/12/12 New Alternator Drive Pulley Has Hardened Wear Sleeve; New Seal Used On Pulley{1425,1357}

1988/12/12 Maintenance Procedure Extends Service Life Of Exhaust Manifold Studs{1050}

1988/12/12 New Mounting Bolts Used In Aftercooler Housings{1063,1058}

1988/12/12 New Solenoid Valve For Rotor Lift System{8245}

1988/12/12 New Switch For Back-Up Alarm{7406}

1988/12/19 New Detent Group Available For Hoist Control Valve {5051}

1988/12/19 New Camshafts Used; Camshaft Installation Kits Available {1209,1210}

1988/12/19 Check Assembled Dimension For Rack Lever Travel If Governor Housing Assembly Is Replaced {1264}

1988/12/19 New Piston Body Assemblies Used {1214}

1988/12/19 Do Not Use Heli-Coils® To Repair Rocker Arm Assemblies On 5.4" Bore Engines {1123}

1988/12/19 Operation Of Differential Lock {3264}

1988/12/19 Twelve Bolts Used In Drum Support Bearing Retainer {8227}

1988/12/26 New Muffler And Pipe Used; Low Idle Increased {1061,1062,1264}

1988/12/26 Check Load Height Before Transporting Machines {7500}

1988/12/26 Enlarge Lower Hook Openings On Three-Point Hitch Quick Coupler Group {7120}

1988/12/26 Check Bore Length Of Gear And Sleeve Before Assembling In Transmission {3061}

1988/12/26 New Gas Cylinder Used In Operator's Console {7451}