1998/04/27 Caterpillar

New Relief Valves In Main Control Valve Improve Swing Operation {5051,5454}

Usage:

330B (9HN, 8SR),
330B L (2RR, 3YR, 6DR, 8TR, 1JS, 4RS, 5LS),
330B LN (5LR) Excavators

Description of Change: Two new relief valves in the main control valve are used to decrease negative control pressure. The lower pressure produces a smoother movement during the initiation of the swing operation.

Adaptable To: The new 147-4163 Relief Valve Group is used in place of the former 109-5152 Relief Valve Group in the 107-7011 Control Valve Group.

The new 147-4161 Relief Valve Group is used in place of the former 109-2667 Relief Valve Group in the 107-7014 Control Valve Group.

The control valve groups listed are components in the 107-7010 Test Valve Group. The test valve group that utilizes the new relief valves is effective with 330B L (3YR490-Up, 6DR1547-Up, 4RS650-Up, 5LS205-Up) and 330B LN (5LR297-Up) Excavators. The effective serial number of the test valve group is 1450-Up for 330B L (6DR) Excavators.

Illustration 1 shows the location of the control valve groups in a unit test valve group. Illustrations 2 and 3 detail the location of the new relief valve groups in a control valve group.

Illustration 1.
107-7010 Unit Test Valve Group.

(1) 107-7011 Control Valve Group.

(2) 107-7014 Control Valve Group.

Illustration 2.
Section A-A from Illustration 1 and Detail C.

(3) 147-4163 Relief Valve Group.

(4) 147-4164 Valve Body (not serviced).

Illustration 3.
Section B-B from Illustration 1 and Detail D.

(5) 147-4161 Relief Valve Group.

(6) 147-4162 Valve Body (not serviced).

Caterpillar Information System:

1998/04/27 New Design Improves Travel Motor Regulator {4351}

1998/04/20 Oil Filter Group Changed To Allow Oil To Be Easily Drained From Oil Lines{1307}

1998/04/20 Oil Filter Group Changed To Allow Oil To Be Easily Drained From Oil Lines{1307}

1998/04/20 Additional Clip In Fuel Injection Lines Groups Helps Secure Advanced Diesel Engine Management (ADEM) I Electronic Control Module (ECM) Fuel Cooling Hose{1252}

1998/04/20 The Swing Bearing In The Bearing And Gear Group Is Improved{7063,5459}

1998/04/20 Improved Ground Engaging Tool (GET) Pin And Retainer Assembly Are Available{6805}

1998/04/20 Optional Valve Spool Kits Are Available For The Pilot Valve Group To Modify The Response Of Implement Controls{5059,5462,5465,5466}

1998/04/13 Improved Rod In Bottom Dump Cylinder Group For Bucket {5457}

1998/04/13 Correction To Service Manual Modules SENR6059 And SENR1371 {7601,7603}

1998/04/13 New Relief Valve For Main Hydraulic System Improves Maintaining Pressure Setting {5069}

1998/04/06 Improved Duct Assembly Enhances Air Conditioning Of Cab {7309,7320}

1998/04/06 Carbody Side Plates Reinforced To Increase Service Life {7062}

1998/04/27 New Hardened Sleeve For Load Check Valve In Control Valve For Stick Circuit Improves Service Life {5067}

1998/05/04 Special Instructions Are now Available For Installing Two-Way And Four-Way Pilot Valves{5051,5059}

1998/05/04 New Retaining Ring In Final Drive Motor Group Improves Reliability{5058}

1998/05/04 Serviceable Parts For Hydraulic Pilot System Pump{5073,5085}

1998/05/04 New Rear Glass Assembly Improves Cab Assemblies{7300,7310}

1998/05/04 New Load Sensing Signal Relief Valve Prevents Wear Between Load Piston And Housing{5117}

1998/05/04 Improved Alternator Groups Now Available{1405}

1998/05/04 ROPS Instruction Film Available Through Parts Service{7177,7405}

1998/05/11 Special Instruction, REHS0183, "Removal And Installation Of Tamperproof Caps On A RSV Governor" Is Available {1264}

1998/05/11 A New Switch Used In High Pressure Screens Of Discharge Lines From Hydraulic Pumps Is Resistant To Internal Leakage Of Hydraulic Oil {5050}

1998/05/11 Bolt Pattern Change From Six To Four In Piston And Rod For Bucket And Stick Cylinders Improves Service Life {5457,5458}

1998/05/11 New Engine Lifter Arm Assembly With Crowned Roller Used In Lifter Groups {1209}