1996/11/11 Caterpillar

Improved Electronic Control Modules Reduce Electrical Interference{7490,3175}

Usage:

Challenger 35 (8DN),
Challenger 45 (1DR),
Challenger 55 (7DM) Agricultural Tractors

Description of Change: The Right Hand Control Module (RHC), Electronic Monitoring Center (EMC), and Chassis Control Module (CCM) have been updated. The following hardware changes have occurred:

* The RHC, EMC, and CCM have been modified to meet new European Electromagnetic Interference (EMI) standards. These EMI "shielding" changes reduce the potential for outside electromagnetic interference caused by FM band radios as well as electrical interference generated from the machine itself.

* The CCM has been modified to "filter" the signal output from the transmission speed sensor. A magnetized gear can cause the CCM difficulty in reading the transmission output speed.

Adaptable To: The "shielded" modules are effective with Challenger 35 (8DN546), Challenger 45 (1DR1145), and Challenger 55 (7DM1-Up) Agricultural Tractors. The "filtered" CCM module is effective with Challenger 35 (8DN595), Challenger 45 (1DR1323), and Challenger 55 (7DM518) Agricultural Tractors. The new modules are a direct replacement for the former modules and are adaptable to all earlier machines. See the chart for part numbers.

Caterpillar Information System:

1996/11/11 Special Instruction, SEHS9874-01, "Challenger Agricultural Tractors In Scraper Applications"{0375,0376,4150,7000}

1996/11/04 Fuel Injection Pump Bushings Have New Groove Adjacent To Load Ring {1251}

1996/11/04 Adjustment Procedure For Cab Door Latch And Hold-Open Release {7301,7308}

1996/11/04 New Suspension Frame Group Now Used To Prevent Cracking {7216,7203}

1996/11/04 Improper Monitoring Of DIFFERENTIAL OIL LEVEL By Vital Information Management System (VIMS) {3258,1920,7601}

1996/11/04 New Tooling Available To Install Power Take-off Output Shaft And Hitch Rock Shaft Seals {0745,3107,0755,7117}

1996/10/28 New Procedure For Installing The Gear On Scavenge Oil Pump Shafts Within Scavenge Oil Pump Groups {1312}

1996/10/28 Seal Kits For Hydraulic Unit Injector Pump Groups Available {1250,1714}

1996/10/28 Procedure To Assemble Hydraulic Pilot Line Fittings {5057}

1996/10/28 Boom And Attachment Control Must Be In The "HOLD" Position When Starting The Engine {5725,7400}

1996/10/28 Additional Brake System Servicing Information {4005}

1996/10/28 Procedure To Adjust Creeper Speed Control {3162}

1996/11/11 Longer Battery Cable Now Used To Prevent Interference With Starting Motor Cover{1401}

1996/11/11 Special Instructions SEHS9896, REHS0037 And REHS0038 Available For Installation Of A Bolt-On Ball On Early Drawbars{6153,6157,6170,6171}

1996/11/11 New Material Increases Service Life Of Brake Hubs{4215,4208,4201}

1996/11/11 Hydraulic Oil Additive Used That Eliminates Noise In Differentials {3263}

1996/11/11 New Crankcase Guard Provides Increased Resistance To Damage{7151}

1996/11/11 New Cover Plates For Rear Of Headlight Guards Protect Wiring From Damage{7182}

1996/11/11 Foot Rest Has Been Added To Improve Operator Comfort{7301,7265}

1996/11/11 Incorrect Electronic Control Service Codes Film{1901}

1996/11/11 Follow Correct Maintenance Procedure To Extend Drum Drive Gear Reducer Service Life{5655}

1996/11/11 Service Replacements For Discontinued Piston Pump Groups{5070}

1996/11/11 New Threaded Gland Cylinder Heads Have Stronger Seal Land{7562,4303,5102,5104,5105,5223,5229,5265,5452}

1996/11/11 New Air Conditioner Evaporator Coil Improves Service Life{7343}