1980/12/01 Caterpillar

Check Alignment Of Engine Flywheel And Torque Converter Input Shaft After Flexible Coupling Failures; Also Check Low Idle RPM{3252,1156,3101}

Usage:

D5B Tractors And 561D Pipelayers Equipped With Power Shift Transmissions

If a D5 or D5B Tractor or a 561D Pipelayer equipped with a Power Shift transmission has a low-hour flexible coupling failure or several flexible coupling failures, check the alignment of the engine flywheel and the torque converter input shaft.

The full indicator movement (FIM; formerly total indicator reading---TIR) in 360° measurement of the flywheel radial runout must not be more than 2.03 mm (.080"). The runout at the face of the flywheel must not be more than 0.66 mm (.026") in 360° of measurement. See Illustrations 1 and 2.

Illustration 1. Installation of indicator to check flywheel radial runout.

Illustration 2. Installation of indicator to check flywheel face runout.

The complete procedure and tools necessary to check the alignment of the engine flywheel and torque converter input shaft are given on page 4 of the Service Manual, "Specifications For D5B Tractor Powertrain," Form No. SENR7554-01 which is used in the Service Manual, "D5B Tractors," Form No. SENR7548.

Also, check the engine low idle speed. The correct setting is 670 ± 30 RPM. If the low idle speed is too slow, vibration can cause a failure of the flexible coupling.

Caterpillar Information System:

1980/12/01 New Service Handle Kit Permits Cab Door To Be Opened From Inside While Locked (Fastened With Lock){7308,7301}

1980/12/01 Larger Plug Used In The Ends Of The Rocker Arm Shaft Assembly{1102}

1980/12/01 Exhaust Manifold And Air Lines Groups Changed To Prevent Exhaust Leakage And Damage To Manifold Gaskets And Mounting Studs{1059,1061}

1980/12/01 Direct Inquiry Service Information Retrieval System (SIRS) Available To U.S. And Canadian Dealers{0374}

1980/11/24 Replacement Wheel Available For Service Of 6V97 Engine Stand Group{0626}

1980/11/24 New Aftercooler Core Has Copper-Nickel Tubes For Increased Strength{1063,1064}

1980/11/17 Some Remanufactured 3406 Engines Have The Wrong Reference Serial Number On The Identification Plate{7557,1000}

1980/11/17 Use Dust Cap To Prevent Freon Leakage From Air Conditioner; Cap Is Available As Replacement Part{7320}

1980/11/17 New Exhaust Manifold Group And Air Lines Group Used To Prevent Exhaust Leakage{1059,1061}

1980/11/17 6V4021 Piston Ring Compressor Group Available{1215,1214,0622}

1980/11/17 Two Thinner Spacers Available For Use During Adjustment Of Off-Engine Timing Dimension{1251,0653}

1980/11/17 Coolant Conditioner Elements Are Now Available For 3208 Engines{1350}

1980/12/01 Warning: Use Correct Seal On Seat Assembly For Valve Group In Steering Valve Group{4307,4312,4322}

1980/12/01 New Front Housing Assembly And Gaskets Used{1162,1166,1151}

1980/12/01 Different Water Temperature Regulators Used In Water Lines Groups{1355}

1980/12/01 Different O-Ring Seal Now Used On The Oil Pump Suction Tube{1307,1304}

1980/12/01 Inspect All Engine Oil And Fuel Filter Elements Before Installation{1000,1261,1318}

1980/12/01 6V4085 Torque Multiplier Group Available{0614}

1980/12/01 Oversize Brake Lining Kit Now Available For Front Wheel Brakes{4254}

1980/12/15 New Bearing Sizes And Identification Codes For AiResearch Remanufactured Turbocharger Cartridges{1053}

1980/12/15 Be Sure To Cut The Center Gasket Even With Top Surface Of Oil Pan Sections To Prevent Oil Leakage{1302}

1980/12/15 Replacement Timing Belts And Variable Belt For Fuel Injection Test Benches Available From Caterpillar{0652,1250}

1980/12/15 Improvements To Selector And Pressure Control Valve Group Give Operator Better Control When Manual Modulation Pedal Is Depressed (Pushed In){3167,3162,3157,3152}

1980/12/22 Tires Are Filled With Nitrogen (N2){4203}