1978/02/06 Caterpillar

Adjustment Of Track Tension On Machines With One Carrier Roller Per Side{4150}

Usage:

D3, D3 LGP, D4, D4 S.A. and D4 LGP Tractors;
931, 941, 951 and 955 Loaders

Description of Change: A different dimension is now used to get the correct track tension on the above models. The December 6, 1976 Service Magazine gave a description of the "slack" adjustment procedure for all track-type machines except excavators. In the article, the idler bearing assembly is moved to the rear .50" (13 mm) from a completely tight track position. For machines with one carrier roller per side, the idler bearing assembly is now moved to the rear .38" (10 mm) from a completely tight track position.

Make a note of this change in your copy of the December 6, 1976 Service Magazine.

Adaptable To: The .38" (10 mm) dimension can be used for track adjustment on all track-type machines that are equipped with one carrier roller per side.

Caterpillar Information System:

1978/02/06 Silicone Sealant Is Now Used To Keep Water Out Of The Steering Clutch Case{4059,4100,4106,4115}

1978/01/30 Air Line For Air Compressor Governor Now Connected To Outlet For Wet Air Tank{4272,1065,4278}

1978/01/30 Retaining Ring Of A New Design Now Used In Torque Converter Group{3100}

1978/01/30 Do Not Change Factory Fuel Or Speed Settings On Truck Engines Unless New Settings Are Certified Under Applicable EPA Regulations{0336,0337,1257}

1978/01/30 Breather For Transmission Case Now Made Of Metal{3150}

1978/01/30 New Water Pump Cover Has A Baffle And Wall To Send Coolant Flow From Bypass Line Directly Into Water Pump{1361}

1978/01/30 New Spring Used In Belt Tightener And/Or Fan Drive Groups{1358,1359}

1978/01/30 Oil Strainer (Screen) Added To Turbocharger Thrust Bearing{1052,1053}

1978/01/30 Electric Fuel Pressure Gauge Now Used{7456}

1978/01/30 Rectifiers And Fuses Added To Transmission Control Wiring Increase Switch Service Life{1408,3168,3172,3173,3174}

1978/01/30 Improved Electrical Wiring Has A Separate Fuse For Each Circuit{1408}

1978/01/30 Valve Damage Can Be Caused By Short Intervals Of Engine Operation In Very Cold Temperatures{1105,1208}

1978/02/06 Add New Measurement And Identification To FT904 Backlash Indicator{0653,3258}

1978/02/06 Stronger Clutch Housing Used In Variable Capacity Torque Converter{3102}

1978/02/06 Successful Engine Service-3208 Engine Booklet Is Available{1000}

1978/02/06 New Water Temperature Regulator Opens At 180°F (82°C){1350,1355,7304}

1978/02/06 Probable Causes Of Low Fuel Delivery During Testing On Fuel Injection Test Benches{0650,1250}

1978/02/13 Replacement Seal Group For Water Pump Impeller Now Has All The Seal Parts Plus An Installation Tool{1361,0622}

1978/02/13 Complete Set Of Contact Points For Dial Indicators Is Now Available In One Group{0653}

1978/02/13 Several Improvements Made To Lines Group In Area Of The Hitch{5057,5077}

1978/02/13 Improvements Made To Push Frame; Instructions To Make Reinforcements On Earlier Push Frames Available{6225}

1978/02/13 Strip Added Under The Hinge For The Front Windshield On ROPS Cabs{7325}

1978/02/13 Check Degree Number On Timing Fixture Plate Assemblies{0650}

1978/02/20 New Transmission Valve Groups Increase Winch Line Pull When Transmission Is In Neutral{3150,3152,3157,3167,3100}