1979/09/03 Caterpillar

Different Mounting Hole Locations In Ring Gear Plate Assembly And Rotor Assembly For BrakeSaver{1155}

Usage:

3406 Truck Engines (Equipped With A BrakeSaver)

In some earlier BrakeSavers used with 3406 Truck Engines, the ring gear assembly was fastened to the rotor assembly with four 3/8" bolts that were an equal (the same) distance apart. These bolts are used for assistance in disassembly and assembly of the unit and also for shipment.

The load for the BrakeSaver is carried through twelve 5/8" bolts that install through the flywheel, rotor plate assembly, and into the crankshaft.

In later BrakeSavers, the bolt hole locations in the ring gear plate assembly and the rotor assembly changed. One of the bolt holes in each part is moved 30° on the same bolt circle as shown in Illustration 1.

If the ring gear plate assembly needs replacement on earlier engines, one of the four bolt holes will not be in alignment. On these engines it is permissible to install only three bolts instead of four. Three bolts have enough strength to hold the unit together.

Illustration 1. Location of earlier and later mounting bolt holes.

Illustration 2. Modification to later 9N3284 Ring Gear Plate Assembly.

Caterpillar Information System:

1979/09/03 Quick Disconnect Coupling On Optional Modification Of 5P4150 Nozzle Tester Permits Faster Exchange Of Adapters{0651,1254}

1979/09/03 Follow Recommendations Given In Special Instructions For Modification Of Rollover Protective Structures (ROPS) At All Times{7323,7325}

1979/09/03 Only One Dowel Pin Is Now Used To Hold The Thrust Bearing In The Correct Position{1053,1052}

1979/08/27 New Design Thrust Plate Used In Crankshaft Group{1201,1202,1203}

1979/08/27 New Rocker Arms And Rocker Arm Shaft Have Improved Lubrication{1102}

1979/08/27 Engine Oil Viscosity Changed To SAE 10W/30 For Shipment From All U. S. Factories{1318}

1979/08/27 6V190 Clamp Is Available For Use On Sleeve Metering Fuel Systems{0626,1250}

1979/08/27 Service Kit Is Available For Woodward UG8 Governor{1289}

1979/08/27 Exhaust Manifold And Air Lines Groups Changed To Prevent Exhaust Leakage{1059,1061}

1979/08/27 New Governor Housing Assembly Used In Governor And Fuel Injection Pump Group{1253,1264}

1979/08/27 Why Engines Are Damaged By Fuel Sulfur{1104,1216,1280,1318,1215}

1979/08/20 New Rear Cover And Gasket Used On Water Pump{1361,1350}

1979/09/10 Insulation Sleeve For 5P7360 Tach Generator Now Available {7462}

1979/09/10 Stronger Bolt Now Used With Exhaust Manifold {1059,1307}

1979/09/10 6V2055 High Vacuum Grease Gives Better Oil Seal {1052,1053,1077,0682}

1979/09/10 Undercarriage Disassembly And Assembly Procedures And Specification Charts Are Available {4150,4159,4154,4171,4180}

1979/09/10 New Gasket Used In Water Lines Group For Aftercooler {1380,1063}

1979/09/10 Different Grease Fitting Now Used In Fan Drive Group {1359}

1979/09/10 Recommendation For Use Of A FLEX-HONE On 1100, 3100 and 3200 Series Engines {1201}

1979/09/10 Tee Handle Hexagonal Wrench In Rack Adjusting Tool Is Now Available For Parts Replacement

1979/09/10 Pin Bore Is Now Offset (Not In The Center) .059" (1.5 mm) In The Piston To Stop Vibration Of The Cylinder Liners Which Can Cause Pitting On The Coolant Side Of The Cylinder Liners {1214,1216}

1979/09/10 Engines Can Use Crankshafts With Either Six Or Eight Counterweights {1202}

1979/09/17 New Main And Connecting Rod Bearings Have A Thicker Layer Of Surface Material{1230,1203,1219}

1979/09/17 New BrakeSaver Control Valve Group Has Improved Diaphragm{1159,1155}