A New Relief Valve May Improve The Transmission Hydraulic Control Pressure On Certain M325B Material Handlers Caterpillar

A New Relief Valve May Improve The Transmission Hydraulic Control Pressure On Certain M325B Material Handlers

Usage:

A New Relief Valve May Improve The Transmission Hydraulic Control Pressure On Certain M325B Material Handlers

CONFIDENTIAL TIBU3828-00

Show/hide table

TECHNICAL INFORMATION BULLETIN	APRIL 09, 2003
EXCAVATORS	M325B MH (2JR, BGN) EXCAVATORS
	Component Code(s) 5051, 3030

SUBJECT: A NEW RELIEF VALVE MAY IMPROVE THE TRANSMISSION HYDRAULIC
CONTROL PRESSURE ON CERTAIN M325B MATERIAL HANDLERS

PROBLEM:

The relief valve in the transmission lines group is sensitive to hydraulic fluid contamination. Contaminated hydraulic fluid may cause the relief valve to maintain an unstable hydraulic control pressure setting. If the relief pressure setting is too low, it can create clutch plate slippage.

SOLUTION:

If the transmission hydraulic control pressure is erratic, replace the 203-6028 Relief Valve with a new 218-8373 Relief Valve. The new relief valve has decreased sensitivity to contaminated hydraulic fluid. The location of the relief valve is shown in Illustration 1. Set the new valve to 2070 kPa (300 psi) at low engine idle.

Illustration 1. Transmission Lines Group
(A) Pressure test port
(B) Relief valve

COPYRIGHT 2003 CATERPILLAR
ALL RIGHTS RESERVED

Caterpillar Information System:

PRIMER/PAINT ON THE FINISHED SURFACE OF CYLINDER RODS FOR SOME WORK TOOLS PRIMER/PAINT ON THE FINISHED SURFACE OF CYLINDER RODS FOR SOME WORK TOOLS

Improvements To The Heating Ventilating And Air Conditioning (HVAC) System Increase Operator Comfort Improvements To The Heating Ventilating And Air Conditioning (HVAC) System Increase Operator Comfort

Loose Connections on Voltage Regulators Can Lead to Above Normal Voltage Output and Regulator Failure Loose Connections on Voltage Regulators Can Lead to Above Normal Voltage Output and Regulator Failure

Check For Clearance When Installing New Electric Starting Motors Check For Clearance When Installing New Electric Starting Motors

Use of the 9Y-5710 Auxiliary Sea Water Pump in 3500 and 3500B applications Use of the 9Y-5710 Auxiliary Sea Water Pump in 3500 and 3500B applications

Automatic Engine Control Regulates Erratically on M300C-Series Wheeled Excavators Automatic Engine Control Regulates Erratically on M300C-Series Wheeled Excavators

Engine Speed Hunting on WEX M300C Series Engine Speed Hunting on WEX M300C Series

MODIFICATION TO PREVENT OIL BLOWING THROUGH THE 165-8460 VENT AS. MODIFICATION TO PREVENT OIL BLOWING THROUGH THE 165-8460 VENT AS.

Hydraulic Oil Overcooling Hydraulic Oil Overcooling

Little or No Heat is Produced by the Heating Unit Little or No Heat is Produced by the Heating Unit

Flashing New Software When Electronic Control Module (ECM) or Injectors Are Replaced Flashing New Software When Electronic Control Module (ECM) or Injectors Are Replaced

A NEW INJECTION ACTUATION PRESSURE CONTROL VALVE CONNECTOR INCREASES ENGINE OPERATION A NEW INJECTION ACTUATION PRESSURE CONTROL VALVE CONNECTOR INCREASES ENGINE OPERATION

AIR FILTER CLOGGED (EVENT CODE E272) EVENT ERRONEOUSLY LOGGED ON M300C-SERIES WHEELED EXCAVATORS AIR FILTER CLOGGED (EVENT CODE E272) EVENT ERRONEOUSLY LOGGED ON M300C-SERIES WHEELED EXCAVATORS

Interference From The Hose Routing Of The Fuel Return Hose Interference From The Hose Routing Of The Fuel Return Hose

Check Bolt Torque on Flex Plates of Certain 3508B Single Bearing Generator Sets Check Bolt Torque on Flex Plates of Certain 3508B Single Bearing Generator Sets

Certain 3E-5239 Relay Assemblies May Fail Certain 3E-5239 Relay Assemblies May Fail

Bracket Adjustment Improves The Seal Of The Cab Windshield Bracket Adjustment Improves The Seal Of The Cab Windshield

INTERFERENCE BETWEEN THE LIFT ARMS ; CERTAIN WORK TOOLS INTERFERENCE BETWEEN THE LIFT ARMS & CERTAIN WORK TOOLS

Procedure For The Preload Of The Bearings In The Final Drive Procedure For The Preload Of The Bearings In The Final Drive

MAIN CONTROL VALVE PLUGS LEAKS ON M300C-SERIES WHEELED EXCAVATORS MAIN CONTROL VALVE PLUGS LEAKS ON M300C-SERIES WHEELED EXCAVATORS

MODIFICATIONS ARE NECESSARY IN ORDER TO USE THE 165-9889 BROOM BRACKET GP ON ALPHA XR MACHINES MODIFICATIONS ARE NECESSARY IN ORDER TO USE THE 165-9889 BROOM BRACKET GP ON ALPHA XR MACHINES

EXPANSION/SPLITTING OF THE STICK AS A RESULT OF WATER ENTERING THE STICK AND FREEZING DURING EXTREME COLD WEATHER CONDITIONS EXPANSION/SPLITTING OF THE STICK AS A RESULT OF WATER ENTERING THE STICK AND FREEZING DURING EXTREME COLD WEATHER CONDITIONS

Governor Motor Governor Motor

A Shuttle Valve In The Main Hydraulic Control Valve May Cause Error Code 1192-07 And Hydraulic Function Shutdown A Shuttle Valve In The Main Hydraulic Control Valve May Cause Error Code 1192-07 And Hydraulic Function Shutdown