1997/01/20 Caterpillar


Modification Of Electronic Control Module (ECM) Controlled Variable Speed Fan Clutch Bracket-Shaft Assembly For Easier Fan Speed Sensor Removal {1359}

Usage:


785B (6HK),
789B (7EK),
793B (1HL),
793C (4AR) Off-Highway Trucks

With a variable speed fan clutch installed, the fan speed sensor is not easy to access and may be difficult to remove. If a fan speed sensor failure occurred, the fan clutch would have to be removed to replace the sensor.

A modification can be made to the 109-8086 Bracket-Shaft Assembly (part of the fan drive group) to allow easier removal of the 126-1132 Fan Speed Sensor. This modification should be done when:

1. A machine is being retrofitted from a standard or analog controlled fan to the ECM controlled variable speed fan.
2. Convenient on all machines which already have the ECM controlled variable speed fan clutch installed without this bracket modification.

Modification

Machine two radii through the 109-8086 Bracket-Shaft Assembly at centers (A-C) and (B-D), as shown in the illustration, to a 12.7 mm (.50 in) Radius.


Dimensions for modification of the 109-8086 Bracket-Shaft Assembly. (A) 8.13 mm (.320 in). (B) 20.83 mm (.820 in). (C) 29.69 mm (1.169 in). (D) 20.83 mm (.820 in). (X) 12.7 mm (.50 in) Radius 2 Places.

Caterpillar Information System:

1997/01/20 "E-Trim" Unit Fuel Injectors {1290}
1997/01/20 Special Edition, SEPD0325, "Major Improvements And Service Information For 768C, 772B, 776C, 776D Tractors, 771C, 771D, 775B, 775D Quarry Trucks And 769C, 769D, 773B, 773D, 777C And 777D Trucks" Is Available {0374}
1997/01/20 Adjustment To Window Hold Back Latch Improves Operation {7301,7310}
1997/01/20 Cab Rear Window Improvements Provide Improved Sealing And Visibility {7301,7310}
1997/01/13 Quickly And Accurately Set Valve Lash{1105,0766}
1997/01/13 Use 125-9622 Seal Installer To Install 118-9163 Seal In Water Pumps{1361,0708}
1997/01/13 Piston Ring Groove Gauges To Quickly And Accurately Determine Reusability Of Pistons{1214,0763}
1997/01/13 Use 126-1023 Stem Pusher For Sleeve And Coupling Removal On Hose Assemblies{5057,0684}
1997/01/13 More Collets Now Available For XT5 And XT6 Hoses Using 4C-9480 Hose Tooling Group{0684}
1997/01/13 Fixture Assembly Allows More Accurate Levelling Of Screed Plates{6643,0764}
1997/01/13 129-7142 Lifting Beam Simplifies Removal And Installation Of Friction Group{6605,0632,0717}
1997/01/13 Use 126-6611 Seal Driver To Install Outboard Oil Seal On Eccentric Group{6605,6606,0727}
1997/01/20 New Ether Starting Aid Groups Include Flexible Hose Assemblies Instead Of Tube Assemblies {1456}
1997/01/20 Increased Tightening Specification Improves Retention Of Thrust Washer Screws In Final Drive {4051}
1997/01/20 New Check Valve Group And Larger O-ring For Load Monitoring System Eliminates O-ring Interference {5067,7200}
1997/01/20 Improved Bearings Used In Output Transfer Gear Group {3159}
1997/01/20 Dump Body Mounted Mud Deflectors (Mud Flaps) Are Available To Prevent Mud From Being Thrown On The Back Of The Tractor {4220}
1997/01/20 A Port Now Provided In The Engine Oil Filter Group For Scheduled Oil Sampling (S.0.S.) {7542,1306,1051}
1997/01/20 VIMS-PC Service Tool Operating System Environment Answers {7601}
1997/01/20 Methods Of Obtaining Engine Flash Files {1902}
1997/01/20 New Remanufactured Water Pump Groups Include Cast Iron Impellers {1361}
1997/01/20 Improved Multi-Row Modules (IMRM) Used In Caterpillar Radiators Have Different Designs {1353}
1997/01/27 Charcoal Air Filter Available Reduces Odors From Outside Air {7309,7320,7342}
1997/01/27 Improved Procedure For Preloading Final Drive Bearings Now Available {4050,4059}
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