1998/04/27 Caterpillar

New Design Improves Travel Motor Regulator {4351}

Usage:

M312 (6TL),
M315 (7ML),
M318 (8AL, 6ES),
M320 (6WL, 9PS) Excavators

Description of Change: The new regulator is designed with four bolts to secure it to the travel motor housing. The former design had two bolts. The additional bolts prevent leakage of hydraulic fluid between the regulator and the control plate of the travel motor. The regulator's control spools have also been redesigned to be less affected by contamination in the hydraulic fluid.

Adaptable To: The new 151-4764 Housing Regulator Group replaces the former 121-9949 Housing Regulator Group. The new regulator is effective with the M312 (6TL384), M315 (7ML756), M318 (8AL1145, 6ES231), and M320 (6WL110) Excavators. The new regulator is adaptable to the M312 (6TL1-383), M315 (7ML1-755), M318 (8AL1-1144, 6ES1-230), and M320 (6WL1-109) Excavators.

The 151-4764 Housing Regulator Group is being used on all new M320 (9PS) machines.

(A) New regulator group.

(B) Travel motor housing.

Caterpillar Information System:

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}

1998/04/06 Further Improvements To Retention System For Excavator Tips And Couplers {6500,6515,6537,6800}

1998/04/27 New Relief Valves In Main Control Valve Improve Swing Operation {5051,5454}

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}