1997/01/27 Caterpillar

New Pressure Switch Assembly Available To Allow The Jake Brake To Release At Low Engine Speed {1119}

Usage:

D400D (8TF, 4EJ) Articulated Trucks Equipped With The Jake Brake Attachment

Reference: Service Magazine, June 12, 1995, Page 3, Standard Equipment Jake Brake Improves Braking Capability And Increased Service Life.

Reference: Service Manual Module; SENR8208; Schematic; D40D, D400D Articulated Dump Trucks Electrical System.

SENR8197; Specifications, Systems Operation, Testing And Adjusting; D40D and D400D Power Train; Pages 30 and 32, Item 8.

A new 3E-6450 Pressure Switch Assembly is available as a replacement for the 6T-1546 Switch Assembly for use on D400D Articulated Trucks equipped with the Jake Brake attachment. On some machines, the 6T-1546 Switch Assembly will not allow the Jake Brake to release at low engine speed at first start-up or low engine speed. The location of the 6T-1546 Switch Assembly can be found in the References.

NOTE: The D400D Articulated Trucks (8TF1258, 1259, 1266 and 1293) are equipped with the 9X-4276 Pressure Switch Assembly.

The parts shown in the chart must be installed along with the 3E-6450 Pressure Switch Assembly when replacing the 6T-1546 Switch Assembly.

Caterpillar Information System:

1997/01/27 New Shield In The Exhaust Shield Group Gives Improved Service {1067}

1997/01/27 New Temperature Sensor For Differential Improves VIMS Data Accuracy {3290,7601}

1997/01/27 Special Instruction, REHS0033, "Assembly Procedure For 777D Truck Body" Is Available {0374,7258,7960}

1997/01/27 An Improved Adjustment Procedure For The Steering Console Cylinder Eliminates Steering Console Drift {4300,5258}

1997/01/27 Improved Procedure For Preloading Final Drive Bearings Now Available {4050,4059}

1997/01/27 Charcoal Air Filter Available Reduces Odors From Outside Air {7309,7320,7342}

1997/01/20 Improved Multi-Row Modules (IMRM) Used In Caterpillar Radiators Have Different Designs {1353}

1997/01/20 New Remanufactured Water Pump Groups Include Cast Iron Impellers {1361}

1997/01/20 Methods Of Obtaining Engine Flash Files {1902}

1997/01/20 VIMS-PC Service Tool Operating System Environment Answers {7601}

1997/01/20 A Port Now Provided In The Engine Oil Filter Group For Scheduled Oil Sampling (S.0.S.) {7542,1306,1051}

1997/01/20 Dump Body Mounted Mud Deflectors (Mud Flaps) Are Available To Prevent Mud From Being Thrown On The Back Of The Tractor {4220}

1997/01/27 Installation Of The Parts Service 7N-3542 Core In The Basic Radiator Assembly {1353}

1997/01/27 New Hose Assembly Improves Hose Routing And Prevents Damage Due To Contact With Steel Tubes {3154}

1997/01/27 New Hoist Control Lever And Handle Improves Operator Comfort {5063}

1997/01/27 New Parts Service Pad And Shim Replaces The Buffer In The Dump Body Group {7258}

1997/01/27 Parts Service Block Replaces Nuts To Provide Better Bolt Retention For The Spillplate Assembly In The Body Group {7258}

1997/01/27 Remote Lubrication Lines Used To Lubricate Upper Hoist Cylinder Pins {7510,7258,5102}

1997/01/27 Special Instruction REHS0006 Available For Installation Of Output Yoke And Screen Housing On Remanufactured Transmissions {3159,3002}

1997/01/27 Solution To Cab Window Fogging {1818,7309,7310,7320}

1997/01/27 New Brake Bleeding Procedure {4250,4293}

1997/01/27 Verify Offset Dimension When Ordering New Wheel Assembly {4209,4202}

1997/01/27 Hydraulic Hose Retention For Vibratory And Drum Propel Systems Improved {5057}

1997/01/27 New Control Lever Group Requires Spacer {1265,3209,5258}