1979/09/03 Caterpillar

Use Caution To Prevent Damage To Plastic Check Valve In Hydraulic Oil Tank And Transmission Oil Tank Drain{5056,3177}

Usage:

D7G, D8K, D9E, D9G, D9H, D10 and 824C Tractors;
825C and 826C Compactors

A plastic check valve is used in the hydraulic tank drain of all of the above models and in the transmission oil tank on D10 Tractors. After the drain plug is removed, a 7B9008 Nipple must be installed in the opening before the check valve will let the oil drain. This valve can be damaged if the 7B9008 Nipple is installed too far into the drain plug opening.

The correct procedure is to install the nipple into the drain opening just far enough to move the check valve off its seat. The oil will then drain through the nipple. If the nipple is installed too far, the plastic check valve can break off. On hydraulic tanks, this can cause a restriction in the hydraulic suction lines that will damage the oil pump.

Caterpillar Information System:

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 Hardened Washers And Increased Torque Are Now Used On The Bolts Which Fasten The Circle Drive Group To The Circle Drawbar{5207,6153}

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

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

1979/08/27 Steering System Improvements Prevent Possible Damage To Steering Cylinder Sockets{4303,4304,4305,4322}

1979/08/27 New Seal For Precombustion Chamber Has More Resistance To Heat And Steam{1106}

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}

1979/08/20 Turbocharger Bearings Are Now Available In More Different Sizes For Better Turbocharger Reconditioning{1053}

1979/08/20 Pump Failure Can Be Prevented{5070,5200}

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

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

1979/09/03 Important: Use Only 8N4029 Fan On 769C Trucks And 768C Tractors{1356}

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

1979/09/03 Improved Wire Assembly For Glow Plugs{1403}

1979/09/03 Improved Hardware Now Used To Fasten Front Suspension Cylinder To Frame{7201}

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 Gasket Added To Rear Wheel Spindle Housing For A Better Seal {4205}