1979/10/22 Caterpillar

More Studs Used To Hold Transmission To Bevel Gear Case{3064,3150,4059}

Usage:

D8H ( 36A ),
D8K ( 76V, 77V, 66V ),
D9H ( 90V ),
DD9H ( 97V, 98V ) Tractors;
583K ( 78V ),
594H ( 96V ) Pipelayers

Description of Change: Changes have been made to the bevel gear case and the transmission (direct drive) or transfer gear (power shift) case on the above models to increase the number of studs used. Three studs are added to the D8 Power Shift Tractors and 583 Pipelayers, and two studs are added to the other models. With the increased number of studs, the nuts will not work loose as easily during operation in heavy load conditions.

Adaptable To: All earlier machines as shown in the chart. Later transmission or transfer gear cases are directly adaptable to earlier bevel gear cases, with or without addition of the new studs. To install an earlier transmission or transfer gear case on a bevel gear case that has the added studs, it will be necessary to either remove the extra studs and seal the stud holes, or drill the new holes in the transmission or transfer gear case.

MODIFICATION: On earlier machines in conditions where the transmission mounting nuts and/or studs have worked loose, check to be sure the transmission is installed correctly. See the article "Correct Installation Of Power Shift Transmission Is Important" on Page 3 of the August 13, 1979 Service Magazine. If this installation procedure does not prevent the problem, the new studs can be added. Complete information to make this modification will be given in a Special Instruction, which will be available soon. The Special Instruction will also give information for the repair of bevel gear cases which have damaged threads in the stud holes.

Caterpillar Information System:

1979/10/22 Cold Temperature Starting Procedures For Air Compressor And Drill Engines{0374,1000,1450}

1979/10/22 New Coolant Temperature Regulator Housing And Vent Line Valve Give Better Control Of Engine Cooling; Conversion Kits Available{1380,1355}

1979/10/22 Bracket Modification Makes Oil Filter Changes On Transmissions Easier{3179}

1979/10/22 Use The FT1482 Stop Collar Assembly With The 1P4000 Line Boring Tool Group{0663}

1979/10/15 New Camshaft Housing Gasket Has Increased Resistance To High Temperature{1113}

1979/10/15 Engine Oil Viscosity Changed To SAE 10W/30 For Shipment From All U.S. Factories{1318}

1979/10/15 Screen Now Used In 7 And 8-Speed Power Shift Transmission Governor Oil Supply And Signal Lines{3167,3179,3151,3004}

1979/10/08 Supplement To Special Instruction, Form SEHS6895, "Bench Testing Hydraulic Components" Now Available On Microfiche{0650}

1979/10/08 Adjust Final Drive Hub Bearings At 2000 Hour Intervals{4054}

1979/10/08 Fast Fuel Delivery Couplings And Fast Oil Change Couplings Are Available For All Caterpillar Equipment{0671,1273,1279,1325}

1979/10/08 Warning: Excessive Heat Can Cause A Tire Explosion{4203}

1979/10/01 Increased Torque For Bevel Gear Retainer Bolts{5167}

1979/10/22 Size Of Glass Beads Is Important When Used To Clean Engine And Turbocharger Parts{0670,1052,1053,1077,1105,1214}

1979/10/22 New Valve Rotator And New Oil Shield Are Available{1104,1105,1109}

1979/10/22 New Connecting Rod Is Tapered In Piston Pin Area{1218}

1979/10/22 Voltage Regulator Can Cause Variable Ammeter Indications{1410,1401,1405,1406,7467}

1979/10/22 Steel Shims Are Now Used To Adjust The Preload On The Front Wheel Bearings{4208,4200}

1979/10/22 New Shaft Used In Fan Drive Group{1359}

1979/10/22 Different Thrust Bearing And Thrust Rings Now Used In Turbochargers{1052,1053}

1979/10/29 New--3208 Engine Maintenance Tips Wall Chart {0374,1000}

1979/10/29 New Top Piston Ring Has Plasma-Coated Face {1215}

1979/10/29 Use The 6V2034 Micrometer Adapter To Measure Lip Thickness Of Engine Valves {0653,1105}

1979/10/29 New Repair Kit Is Available For Service Of Hydraulic Jack {0642}

1979/11/05 Correct Installation Of Track Shoe Nuts{4170,4179}