1996/08/19 Caterpillar

Cab Improvements Reduce Glass Fracture and Improve Sealing {7310,7323,7340}

Usage:

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

Description of Change: Several improvements have been made to the cab. In order to prevent glass breakage, the corner radius of the front glass has been changed to 6 mm (.24 in). In order to improve cab sealing, the following improvements have been made: the door switch location has been moved in order to avoid interference with the door seal, the roof grommet material was changed from neoprene to propelyne in order to improve weatherability, and the diameter of the front two nylon washers has been increased from 25.4 mm (1 in) to 38.1 mm (1.5 in) to allow for adequate sealing with wider tolerance variations in the roof.

Adaptable To: The 137-9402 Nylon Washer replaces the 116-5740 Nylon Washer in the 116-5679 Outer Roof Group. The cab improvements are effective with Challenger 35 (8DN564), Challenger 45 (1DR1233), and Challenger 55 (7DM463) Agricultural Tractors.

NOTE: Due to the order of cab installation, there may be a limited number of machines before or after the effective machines which do not have the changes.

Caterpillar Information System:

1996/08/12 New Connector Assembly In Water Lines Group {1380}

1996/08/12 Be Sure To Use New 129-1939 Grease When Rebuilding Water Pump Groups {1361,0645}

1996/08/12 New High Efficiency Secondary Fuel Filter Assembly Improves Injector Life On 3500 Engines With EUI Injectors {1261}

1996/08/12 New Basic Exhaust Bypass Group (Wastegate Valve) Used In Exhaust Bypass Group {1057}

1996/08/12 New Grooved Piston Assemblies Available For Piston Pump Rotating Groups {5070}

1996/08/12 Smaller Diameter O-Ring Seal Used On Head For Threaded Gland Cylinder Groups {4303,5101,5102,5104,5452,7562}

1996/08/12 New Maintenance Schedule Reduces Cost Of Servicing {7500}

1996/08/12 Load Capacity Chart Part Numbers Are Now Available For Telehandlers Under ANSI Regulation {6400,7000}

1996/08/12 Individual Components Of The Rolling Hoses Are Available as Separate Service Parts {5057}

1996/08/12 Longer Battery Cable Improves Service Life of Battery Posts {1402}

1996/08/12 New Priority Valve Spool Increases Steering System Flow {4306,4320}

1996/08/12 Procedure For Steering Stop Setting {7050}

1996/08/19 Improved Test Procedure For Hydraulic Pump Torque Limiter {5070}

1996/08/19 Improved Tachometer Assembly Now Used Which Eliminates The Problem Of Moisture Entering The Flat Bezel {7462}

1996/08/19 Replacing The Tee Gasket In Split Oil Pan Groups With A Flexible Gasket Maker {1300}

1996/08/19 New Adapter Used In Oil Filter Group To Provide Increased Parts Commonality {1318}

1996/08/19 New Seal Retainers And Backing Plate Used To Reduce Oil Leaks And Provide An Increased Face Load On Duo-Cone Seals {4251,7561}

1996/08/19 New Orifice Plate To The Rear Brake Cooling Return Oil Line Significantly Reduces Hub Wear {4257}

1996/08/19 New Seal Used In Metering Pump Group To Improve Service Life {4312}

1996/08/19 Improvement For 117-7553 (Fuse Panel) Breaker Group Access {1417}

1996/08/19 New Parts Service Bearing For The 6Y-5893 and 6Y-5965 Basic Torque Converter Groups Gives Longer Service Life {3101,3134}

1996/08/19 New Master Cylinder Group Reduces Brake Pedal Effort {4258}

1996/08/19 Governor Control Cable Improved {1265}

1996/08/19 Procedure For Setting Rear Steering Position Sensor {4005}