1997/10/27 Caterpillar

Improved Steering Column Boot Resists Cracking{4338,7300}

Usage:

Challenger 65C (2ZJ),
Challenger 65D (2ZJ),
Challenger 70C (2YL),
Challenger 75C (4KK),
Challenger 75D (5AR),
Challenger 85C (9TK),
Challenger 85D (4GR) Agricultural Tractors

Reference: Service Manual Module; SENR9443; "Challenger 65D, Challenger 75D, Challenger 85D Agruicultural Tractors Machine Systems Disassembly and Assembly."

Description of Change: The steering column boot is now constructed with an improved material. The new steering column boot is more flexible than the former design. The use of the new material should significantly reduce the possibility of breaking when under stress, especially in cold weather.

NOTE: To reduce the possibility of stress on the former or the new column boots, make sure the boot has clearance above and below the column. If not, loosen and reposition the column support in order to relieve the pressure. See the referenced Service Manual Module for removal and assembly instructions.

Adaptable To: The improved 145-0344 Boot is a direct replacement for the former 4E-2714 Boot. The improved boot is effective with approximately Challenger 65D (2ZJ2526), Challenger 75D (5AR535), and Challenger 85D (4GR848) Agricultural Tractors. The improved boot is adaptable to all C and D Series Challenger Agricultural Tractors.

Caterpillar Information System:

1997/10/20 Service Interval Change For Extended Life Coolant Extender And Extended Life Coolant{1395,7543,7545}

1997/10/20 Improved Sealing On Caterpillar Monitoring System And VIMS Modules Provides Resistance To Lens Fogging{7490,7601}

1997/10/20 Service Repair Procedure For Engine Cowls{7263,7251}

1997/10/20 Correct Retaining Ring Specified For Shaft Seal In Piston Motor Group For Fan Drive{5058}

1997/10/20 New Off-Highway Truck Electronic Control Group (EPTC II) Used{7601,7490,7463}

1997/10/20 New Hose Assembly In Oil Cooler Lines Group Prevents Rubbing{1365,4268,7554}

1997/10/20 New Body Assembly Used In Off-Highway Truck Air Cleaner Group To Improve Air Flow To Pre-Cleaners{1051,1055}

1997/10/20 Special Instruction, REHS0078, "Retrofit Procedure For Air Operated Exhaust Diverter" Is Available{0374,1061}

1997/10/20 New Hold Back Latch Available{7310}

1997/10/20 Improved Rust Protection On Cab Doors{7308}

1997/10/20 Tandem Oil Level Verification{4064}

1997/10/20 New Battery Box Covers Now Used To Improve Access To The Batteries{2553,7250,7257}

1997/10/27 Stronger Sun Visor Guides Available {7300,7340}

1997/10/27 All "H" Series Motor Graders (Except 24H) Are Now Equipped With 2 Cylinder Air Compressors{1803}

1997/10/27 Reliability Of Transmission Fluid Level Reading Improved With Addition Of Baffle Plate{3081,3080}

1997/10/27 Improved Duo-Cone Seal Group Increases Service Life{4201,4050}

1997/10/27 New Custom Product Support Literature Is Available For 773D And 775D Trucks Equipped With Wiggins Service Center{0374}

1997/10/27 New Custom Product Support Literature Is Available For 777B Trucks Equipped With Air Quick Disconnect{0374}

1997/10/27 New Custom Product Support Literature Is Available For 776C Tractors And 777C Trucks Equipped With Fuel Tank Extension Group{0374}

1997/10/27 Changes Made To Water Lines Group In Order To Reduce Damage Caused By Vibration{1380}

1997/10/27 New Brake Valve Groups Have Breather Plug In Vent Port For Air Cylinder Group{4265}

1997/10/27 Updated VIMS Configurations Available For 793C Off-Highway Trucks{7601,7407,7417,7470,1924}

1997/10/27 Corrected Boom Chain Information For Operation And Maintenance Manual{6460,6404}

1997/10/27 New Vane Pump Group, Assures Clearance For Drive Gear, And Correct Alignment Of Vane Pump Group With Torque Converter Cover{5055}