1995/09/11 Caterpillar

Improved Prelube Pressure Switch Available {1400,1435,1319}

Usage:

All Caterpillar Machines Using Prelube System

Reference: Special Instruction, Servicing DT Connectors, SEHS9615.

A new pre-lube pressure switch is now available. The new switch provides increased reliability by eliminating the screw terminal and case ground connections.

The new 105-9152 Pressure Switch directly replaces the former 4Q-5451 Pressure Switch except that a Deutsch plug (DT) must be installed on the machine wiring harness. See the chart for parts needed to install the DT plug. See the listed reference material for additional installation instructions. The new 105-9152 Pressure Switch is adaptable to Caterpillar machines using the former 4Q-5451 Pressure Switch which will no longer be available.

NOTE: The former 4Q-5451 Pressure Switch used case ground for one of the conductors. The new 105-9152 Pressure Switch uses two separate conductors. When installing the new Deutsch plug, one of the wires must be connected to a clean engine or frame ground. Use a terminal of the proper size which can be found in the 1P-2305 Terminal Kit and the appropriate length of 5P-5623 Wire for the ground connection.

Caterpillar Information System:

1995/09/11 New Guard Assembly Used In Refrigerant Compressor Groups {1802}

1995/09/11 Transmission Oil Filter Change Interval Increased {3179}

1995/09/11 Transmission Neutralizer Switch Can Be Adjusted To Adapt To Different Operating Conditions {4274,3168,3418,4265}

1995/09/11 Pressure Reducing Valve Has Been Removed From Retarder Control Group To Improve Retarder Response {3122,3120}

1995/09/11 Ground Body Bolts And Locknuts Improve Retention Of The Aluminum Gear In The Circle Drive Groups {5207}

1995/09/04 5P-8665 Liner Puller Group Changed To Accommodate Cylinder Liner With Larger Diameter Top Flange{1216}

1995/09/04 Exhaust Manifold Crossovers Changed To Improve Serviceability And Maintain Balanced Engine Exhaust{1059}

1995/09/04 New Flexible Hose Assemblies Used In Turbocharger Oil Lines Group{1052,1307}

1995/09/04 New High Pressured Turbocharger Groups Reduce Exhaust Leaks{1052,1053}

1995/08/28 New And Reconditioned Valve Projection Specifications{1105}

1995/08/28 New Thicker Exhaust Manifold Gasket Used{1059}

1995/08/28 Modifying Former Exhaust Manifold Sections To Help Prevent Loosening Or Breakage Of The Exhaust Manifold Retaining Bolts{1059}

1995/09/11 Software Improvements For EPTC II Controls On Tractors, Trucks, And Wheel Tractor-Scrapers {3168,3150}

1995/09/11 New Exhaust Valve With Tapered Stem Used In Engine Cylinder Head Groups {1105}

1995/09/18 New Link Assemblies And Tie Rod Clamp Assemblies With Changed Torque Specifications {4318,4329}

1995/09/18 Flange Assembly And Body Assembly For 103-4891 Implement Gear Pump Group Now Serviced {5073}

1995/09/18 Electronic Control Module (ECM) Has Improved Features{3225,1901,7451}

1995/09/18 Air Compressor Piston Now Has Five Ring{1806}

1995/09/18 New Stronger Engine Lifting Eye Bracket Used{1122}

1995/09/18 New Engine Water Pump Groups Include New Seal Group{1361}

1995/09/25 The 1R-0750 High Efficiency Fuel Filter Assembly Available For 3306 Engine{1254,1261}

1995/09/25 New Engine Water Pump Elbow and Seal Resists Compression Set and Abrasion{1361}

1995/09/25 PTO Lube Pressure Test Fitting Available{3107}

1995/09/25 Hose Has Been Added To The Brake Control Group To Increase The Service Life Of The 6G-8425 Control Valve Group{4257,4267}