1988/12/19 Caterpillar

New Brake Disc Assemblies, Axle Lubricant Reduce Brake Chatter {3278,4255}

Usage:

416, 426, 428, 436, 438 Backhoe Loaders

Description of Change: Improvements have been made to reduce brake chatter from the rear axle during normal service brake applications. The noise or chatter is due to a stick/slip action of the brake plates and discs.

A new rear axle lubricant is used which has friction modifiers to eliminate the brake chatter. A Ford® M2C134-C Oil (standard rear axle oil) can be mixed with Ford part number 251403 Friction Modifier and added after replacing the brake actuators and completely flushing the rear axle housing. Mix 0.9 L (1 qt) of friction modifier and 19 L (5 gal.) of M2C134-C Oil for replacing the lubricant in the axles. This mixture is equivalent to the newly specified Ford number M2C86-C Oil which is available only from a Ford dealer.

New brake disc assemblies now used give increased mechanical advantage when applying the service brakes. This improvement requires less operator leg effort than before to achieve the same braking action.

Adaptable To: The new 9R6364 Disc Assembly is a direct replacement for the former 9R2478 Disc Assembly which is canceled. The new brake disc assembly and the new axle oil are in effect with 416 (5PC6679), 426 (7BC2050), 428 (6TC2990), 436 (5KF210), and 438 (3DJ1) and are adaptable to all earlier backhoe loaders.

Caterpillar Information System:

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}

1988/12/12 Parts Needed If Air Compressor Tubes Replaced{4257,1803}

1988/12/12 New Operator Monitor Group Used{7490}

1988/12/12 Revised Instructions For Installation of New Maintenance Free Batteries{1401,1400}

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

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

1988/12/19 New Axle Differential Group Used {3258}

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}