1997/01/27 Caterpillar

Solution To Cab Window Fogging {1818,7309,7310,7320}

Usage:

914G (7ZM, 9WM) Wheel Loaders IT14G (1WN, 8ZM) Integrated Toolcarriers

Reference: Operation & Maintenance Manuals SEBU6868 and SEBU6869, (page 94), "Cab Air System".

On numerous occasions there were two main reasons for the 914G Wheel Loaders and IT14G Integrated Toolcarriers cab windows fogging.

1. A/C condensate drain valves (two rubber tubes hanging from under the front of the cab) have become clogged causing the condensate water to accumulate in the lower ductwork of the cab. This is especially important in the "G" series since an accumulation of water in the heater/evaporator box will cause the fan motors to be covered with water.

2. The fresh air path has become blocked forcing the use of all recirculated air in the cab. This condition of all recirculated air will cause fogging.

Addition of a new operator maintenance check every fifty service hours, or weekly, will eliminate these two possibilities. Check the condensate drains by removing and checking for presence of water. Check the fresh air filter and housing to make sure they are not blocked. This maintenance check is adaptable to all first production machines listed above.

Caterpillar Information System:

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

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

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

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

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

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

1997/01/27 New Pressure Switch Assembly Available To Allow The Jake Brake To Release At Low Engine Speed {1119}

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 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}

1997/01/27 Repair Centers For Sonic Grade Sensors Established {5645}

1997/01/27 C-V (U) Joint Life Extended Through Correct Operation Of The Differential Lock {3274,2453,3259,3260,3264}

1997/01/27 New Replacement Procedure For Hydraulic Hoses Inside The Telescopic Material Handler Boom {5057,6460}

1997/01/27 VIMS Exhaust Temperature Sensor Is Improved {7601,1919}

1997/01/27 Use Of Windows Write (Or Notepad) And Paintbrush For Taking Field Notes {0785,7601}

1997/01/27 Field Repair Of Single Wire Breaks In Harnesses {1408}

1997/01/27 Premachined Valve Seat Inserts And Precision Valve Guide Increase Valve Life {1103,1104}

1997/01/27 Points To Remember When Replacing A Viscous Crankshaft Damper Assembly With A Rubber Crankshaft Damper Assembly {1205}