1980/09/29 Caterpillar

Improved Poppet Valves Used In Plate And Valve Assembly Of Transmission Control Group{3009}

Usage:

7155 Transmissions

Description of Change: Improved poppet valves are used in the plate and valve assembly of the transmission control group for 7155 Transmissions. The regulator valve is now held on the stem of the poppet valve with a pin (see Illustration 1). Also, the fifty four poppet valves which have a piston on one end are held together differently. The end of the poppet valve stem is peened (bent) over the piston to keep it in position (see Illustration 2).

Formerly, these components were held together with a press fit, and it was possible for the piston to work loose on the valve stem.

Adaptable To: The new parts used together are a direct replacement for the former parts as shown in the chart.

Illustration 1. Regulator valve. Valve is held on end of poppet valve with a pin.

Illustration 2. Stem is peened over end of piston on poppet valves to hold them together.

Caterpillar Information System:

1980/09/22 Install A New Oil Filter Element, Clean The Oil Lines And The Remote Filter Base; Turn The Engine Until The Oil Gauge Shows Pressure Before Starting A Rebuilt Engine {1307,1318}

1980/09/22 Do Not Use Room Temperature Vulcanizer Compounds Or Silicone Rubber Cements On O-Ring Seals In Engines; Do Not Use Too Much As Gasket Material {1000,7555}

1980/09/22 6V3071 Seal Guide Keeps Seal In Position During Installation Of Transfer Pump {0620,1256}

1980/09/15 Use Only Caterpillar Water Separator Elements{1263}

1980/09/15 Reference List Of Pistons Used With The Different Types Of Connecting Rods{1214,1218}

1980/09/15 Special Cup Plugs For Use In Oversize (Larger Than Standard Size) Bores In Valve Rocker Arm Shafts{1102}

1980/09/15 Reverse Flow Check Valves And Check Valves With A Groove Can Not Be Used In Place Of Each Other{1251,1272,1254}

1980/09/15 6V2107 And 6V2110 Drive Adapter Assemblies Available To Connect Sleeve Metering Fuel Systems To Fuel Injection Test Bench{0652,1250}

1980/09/15 6V3025 Battery Cable Repair Kit Now Available{1402,1408,0611}

1980/09/08 6V3143 Distorter Adapter Available For Use With 5P7409 Wear Sleeve Distorter For Removal Of Crankshaft Wear Sleeves{0621,1202,1160,1161}

1980/09/08 4S6553 Engine Evaluation Test Instrument Group Has Been Canceled{0651}

1980/09/08 New Oil Scavenge Tube Assemblies Used In Oil Lines Groups{1307,1312}

1980/09/29 Woodward 2301 Speed Control (8N1731 Speed Control Group) Can Be Adapted For Use As Field Test Instrument{0651,1264,1265,1289}

1980/09/29 Some Test Procedures And Specifications Changed For 9L6884 Fuel Injection Nozzle Assemblies{1254,0651}

1980/09/29 Use Starter To Turn Crankshaft For 30 Seconds Or Until Oil Pressure Gauge Shows Pressure, Before Engine Is Started{1300,1450}

1980/10/06 Fretting Material Must Be Removed Before Installation Of New Bearings{1202,1203,1218,1219,1201,1230}

1980/10/06 New Timing Advance Weight Used{1272,1288,1286,1264}

1980/10/06 New Breather Groups Used{1317}

1980/10/13 6V3184 Brush Group Available To Clean Crankshaft Oil Passages{0622,1202}

1980/10/13 6V2156 And 6V2157 Link Brackets Now Available To Lift Heavy Loads{0644}

1980/10/13 New Tools Available For Installation Of Crankshaft Seals And Wear Sleeves{0622,1160,1161}

1980/10/13 6V3116 Adapter Group Is Available For Use On Fuel Injection Test Bench{0652,1251}

1980/10/13 Improved Temperature Control Switch Used On Machines Equipped With Air Conditioner Units{7320}

1980/10/13 Understand The Effects Of Extended Oil And Filter Change Intervals{0375}