1995/10/09 Caterpillar

Bolt Dampers Have Been Added To The No.5 Clutch Stack In The 6Y-5642 Planetary Group {3155,3169}

Usage:

793B (1HL) Trucks

Description of Change: Seventeen dampers are now used in the 8E-5624 Clutch Housing Assembly (No. 5 clutch housing). These dampers are in addition to those used in the 8E-5628 Clutch Housing Assembly (No.6 clutch housing).

The additional dampers will stiffen the bolts and prevent bolt failure due to fatigue caused by resonance during machine operation.

Adaptable To: The 6I-9790 Dampers are in production with transmission Serial Number 6LE897 in 793B Trucks (1HL) and can be installed in earlier 793 and 793B Trucks using the following method.

Illustration 1. Location of the 8E-5624 Clutch Housing Assembly (1) in the 6Y-5642 Planetary Group.

1. Remove the 8E-5624 Clutch Housing Assembly from the transmission.

2. Increase the size of seventeen holes to the dimension shown in Illustration 2.

Illustration 2. Dimension (A) 24.0 mm (.94 in) diameter, 65.0 mm (2.56 in) deep, 17 holes.

NOTE: Increase the size of the seventeen holes on the end of the housing which faces No.6 clutch housing.

4. Install the 6I-9790 Dampers in the modified holes and assemble the transmission.

Caterpillar Information System:

1995/10/09 Caterpillar Legendary Service Literature Catalog SELD0811 Updated {0374}

1995/10/02 Numbering The Crankshaft To Match Counterweights {1202,1231}

1995/10/02 Service Manual and Parts Manual Literature Now Available {0374,0375,7568}

1995/10/02 Rear Suspension Cylinder Charge Can Be Checked By Measuring Between The Rear Suspension Cylinger Retaining Pins {7213}

1995/10/02 3G-4667 Relief Valve Group (Steering Crossover Valve) Now Serviced As A Complete Group {4322}

1995/10/02 Strengthened Drive Wheel Provides Increased Life {4199}

1995/09/25 Fuel System Service Information{1250}

1995/09/25 Improved Stop Lamp Pressure Switch Available{1435,7805}

1995/09/25 Retrofit Of Corporate Fuel Cap To Threaded Fuel Tank Filler Neck Now Available{1273}

1995/09/25 Pump Conversion Required for Replacement of Water Spray Pump{5612}

1995/09/25 Replacement Knob Now Available For Sonic Feeder Control Sensors{5643}

1995/09/25 Improved Bolt Retention On Differential Carrier To Axle Housing Bolted Joint{3260,3284}

1995/10/09 Body Mounting Group Baffle (Mudflap) Profile Has Been Changed To Improve The Service Life Of The Baffle {4220,7258}

1995/10/09 Steering Modification To Prevent The Jacket Tube Bearing Working Loose {4301,4309,4310}

1995/10/09 New Flushing Valve Used On Drum Propel Motor Improves Flushing And Cooling {4351,5058}

1995/10/09 Alternate Style Grease Gun Coupler Provides Better Service {0646}

1995/10/16 Seat Tethers Information and Locations{7324}

1995/10/16 Changes Have Been Made To Improve Performance And Serviceability Of The Motor Grader Front Wheel Drive Groups{3278,4351,4352}

1995/10/16 New Hose Assembly in The 6G-7858 Hoist Oil Lines Group Resists Erosion Caused By Oil Flow{5057}

1995/10/16 New Method Used To Install Fabric Covers For Rear Suspension Cylinders{7201}

1995/10/16 New Suspension Cylinder Rod Seals Reduce Leakage In All Applications{7201,7213}

1995/10/16 Field Repair 0f Cracked 2G-9774 Guard Assembly (Right Front Fender){7252}

1995/10/16 A Change Has Been Made To The 9X-3136 Basic Heater Group To Reduce Leaks{7304}

1995/10/16 Adding A Shim Pack To Bottom Hitch Improves Bolt Retention{7100}