1990/10/08 Caterpillar

New Pump Group With Bolt Dampers Used In Oil Pump Group{1304}

Usage:

3512 ( 49Y, 50Y, 51Y, 24Z, 66Z, 4KC, 3YF ),
3516 ( 25Z, 27Z, 28Z, 29Z, 71Z, 72Z, 73Z, 3RC, 4XF, 9KF ) Engines;
785 ( 8GB ),
789 ( 9ZC ) Trucks

Reference: Service Magazine; September 24, 1990; "Add Bolt Dampers To Oil Pump Mounting Bolts To Prevent Bolt Failures".

Description of Change: A new pump group that includes bolt dampers is used in the oil pump group. In the former pump group, the three 4S5882 Bolts that fasten the pump group to the engine could vibrate. The vibration could result in bolt failure. The bolt dampers in the new pump group will prevent the bolt vibration.

Adaptable To: The new 4P5638 Pump Group and three 9M4355 Dampers are direct replacements for the former 7W0054 Pump Group which is canceled.

All of the components, except the body assembly, are the same in the new and former pump groups. The 4P5638 Pump Group includes a 4P5637 Body Assembly, while the former 7W0054 Pump Group included a 7W0052 Body Assembly. The three pump mounting holes in the new body assembly are counter bored to accept the new 9M4355 Bolt Dampers.

Caterpillar Information System:

1990/10/08 Price Adjustments On Service Program Modules{1902,0782}

1990/10/08 New Exhaust Valves Are Used In Caterpillar Remanufactured Cylinder Heads{1105,1101}

1990/10/08 Improved 4J3815 Gasket Helps Prevent Oil And Air Leaks In Hydraulic Tank Mounting And Filler Groups{5065}

1990/10/08 Serviced Parts Available For 8C4773 Electric Starting Motor Group{1453}

1990/10/01 Answers To Quiz In This Issue {0114,1400}

1990/10/01 Incorrect Installation Of Slow-Moving Vehicle Sign (Triangle) May Affect Cooling Performance {7405,1353,7557}

1990/10/01 New 4C6090 Multichannel Temperature Selector Available To Aid In Diagnosing Low Power Complaints {0781}

1990/10/01 Correct Light Bulb Replacement For The 8T9290 Borescope; New Light Bulb Used {0777}

1990/10/01 What's Your Answer? {0114,1400}

1990/09/24 Add Bolt Dampers To Oil Pump Mounting Bolts to Prevent Bolt Failures{1304}

1990/09/24 Incorrect Throttle Adjustment Can Cause Engine Surge{1913,0782,1900}

1990/09/24 Standard Oval And High Temperature Oval Head Seals Available For Certain Hydraulic Cylinder Applications{7555,5102,5456}

1990/10/15 Be Sure To Use Only 5P3975 Rubber Lubricant On The Core Assembly End Seals In Folded Core Or Multiple Row Module Radiators{1353,1351}

1990/10/15 Additional Clip And Hardware Prevent Damage To Fuel Line Of 4W6887 Instrument Panel{1261}

1990/10/15 New Temperature Regulators; Regulator Service Hours Changed{1330,0770,1355,7527,7543}

1990/10/22 Improved 3T2357 Horn Switch, 3T3453 Starting Aid Switch, 3T3947 Start Switch, 3T8514 Test Switch Assemblies {1416,1456}

1990/10/22 4C6600 Battery Voltmeter For Determining Battery Percent Of Charge {7468,0785,1401}

1990/10/22 New 4C5084 Oil Filter Cutter Replaces Former 6V7905 Filter Cutter {1318,1261,5068}

1990/10/22 Engine Service Training Literature Uses New Form Number {0370,0374}

1990/10/22 Correct Procedure To Check For Grounds On Woodward 9905 Series, 2301A Control; Correction For Service Manual Module; 2301A Electric Governors (Load Sharing) For Generator Set And Industrial Engines; Form SENR3585-01 {1289}

1990/10/22 Setscrew And Nut Available For Fuel Setting And Injector Synchronization {1257}

1990/10/22 Improved 7C1757 Exhaust Manifold Group {1059}

1990/10/22 Front Trunnion Bolts May Come Loose {1153,1154}

1990/10/22 Increased Capacity Oil Sumps Require Additional Oil And Different Maintenance Interval {1302,1318,7524,7525}