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Caterpillar hydraulic excavators serie D
SERV1852-02 August 2008 GLOBAL SERVICE LEARNING TECHNICAL PRESENTATION 320D-336D HYDRAULIC EXCAVATORS TIER III ENGINES TRAVEL SYSTEMS Service Training Meeting Guide (STMG) 320D-336D HYDRAULIC EXCAVATORS TIER III ENGINES TRAVEL SYSTEMS AUDIENCE Level II - Service personnel who understand the principles of machine systems operation, diagnostic equipment, and procedures for testing and adjusting CONTENT This presentation provides an introduction and describes the components and systems operation of the 320D - 336D hydraulic excavator Travel Systems Additional presentations will cover the machine walkaround, engines, pilot system, pumps and controls, main control valve group, swing system, and tool control systems in more detail This presentation may be used for selfpaced and self-directed training OBJECTIVES After learning the information in this presentation, the technician will be able to: identify the correct operation of the Travel Systems on the 320D-336D hydraulic excavators, and diagnose problems in the Travel Systems REFERENCES 320D Hydraulic Excavator Specalog 323D L and 323D LN Hydraulic Excavators 324D Hydraulic Excavator Specalog 325D Hydraulic Excavator Specalog 328D Hydraulic Excavator Specalog 330D Hydraulic Excavator Specalog Machine Monitoring System - Systems Operation Self-study "300D Series Hydraulic Excavators, 345C Hydraulic Excavator, and 365C & 385C Large Hydraulic Excavators iTIM " '300C' Series Hydraulic Excavators-Electronic Control Systems" iTIM "325C Hydraulic Excavators-Hydraulic Systems" 325D Hydraulic Schematic Estimated Time: Hour Illustrations: 30 Form: SERV1852-02 Date: August 2008 © 2008 Caterpillar AEHQ5856 HEHH3327 AEHQ5663 AEHQ5665 AEHQ5706 AEHQ5667 RENR8068 SERV7032 SERV2693 SERV2701 KENR6157 SERV1852-02 08/08 -3- Text Reference Travel Systems TABLE OF CONTENTS INTRODUCTION TRAVEL SYSTEMS COMPONENTS 320D-329D TRAVEL SYSTEMS OPERATION .13 Travel Motor 13 Travel Parking Brake and 20 320D Travel Brake Valve 22 Makeup Operation 28 330D/336D TRAVEL SYSTEMS OPERATION .29 Travel Motor 29 Travel Parking Brake 36 321D-336D Travel Brake Valve 38 Makeup Operation STRAIGHT TRAVEL VALVE 45 SWIVEL .53 FINAL DRIVE 55 CONCLUSION 54 SERV1852-02 08/08 -4- Text Reference Travel Systems PREREQUISITES "Fundamentals of Mobile Hydraulics Self Study Course" "Fundamentals of Power Train Self Study Course" "Fundamentals of Electrical Systems Self Study Course" "Fundamentals of Engines Self Study Course" TEMV3002 TEMV3003 TEMV3004 TEMV3001 NOTES Nomenclature Change: During the fourth quarter of 2008, the 325D and 330D nomenclature changed The 325D became the 329D and the 330D became the 336D for most arrangements The exceptions are as follows: - The nomenclature for the 325D MH and 330D MH did not change - The nomenclature for the 325D FM and 330D FM did not change - The 325D HD HW did not change into 329D HD HW This model is being discontinued However, the 330D HD HW changed to the 336D HD HW SERV1852-02 08/08 -5- Text Reference Travel Systems TRAVEL SYSTEMS Stick Cylinder Bucket Cylinder Swing Motor Main Control Valve Group Pilot Control Valves Priority Valves Pilot Manifold Pilot Pump Fan Motor Boom Cylinders Travel Motors Main Hydraulic Pumps M Fan Pump Tank The Fan Motor and Pump are only used on the 330D and the 336D INTRODUCTION This presentation covers the 320D - 336D hydraulic excavator Travel Systems Both the drive pump and idler pump are used to provide flow to the Travel Systems The Travel Systems includes the following components: - travel pedals/levers - travel pilot valves - left and right travel control valves - straight travel valve and solenoid - two travel motors - travel park brake - two speed travel solenoid valve NOTE: The 330D and 336D travel motor is slightly different in operation than the travel motors used in the smaller machines The 330D and 336D travel motor will be covered in a revision to this section SERV1852-02 08/08 -6- TRAVEL HYDRAULIC SYSTEM Left Travel Motor Right Travel Motor Text Reference Travel Systems NEUTRAL Straight Travel Solenoid Swivel Left Straight Travel Control Valve Right Travel Pilot Valves REV FWD FWD Right Travel Valve Left Travel Valve Main Relief Valve REV AEC Idler Pump Travel Speed Solenoid Valve Swing Brake Solenoid Pilot Pump M Hydraulic Activation Valve Implement Hydraulic Lockout Solenoid Drive Pump Pilot Manifold TRAVEL SYSTEMS COMPONENTS The idler pump and drive pump supplies oil flow to the travel control valve circuit, which controls pump flow to the two travel motors When the travel control valves are in NEUTRAL, pump supply oil from the pumps flows through the center bypass passage in the travel valves through all other control valves (not shown) to the NFC valves (also not shown) The return oil from the pumps through the bypass passages (neutral envelopes of the valve) creates NFC signals used to destroke the pumps Pilot oil is available at the travel speed solenoid valve Since the implement hydraulic lockout solenoid has been energized, the hydraulic activation valve has shifted Pilot oil is directed to the travel pilot valves SERV1852-02 08/08 -7- Text Reference Travel Systems Some of the major components of the Travel Systems include: Two Speed Travel Solenoid Valve: This solenoid valve is controlled by the Machine ECM The valve controls the position of the displacement change valve in each motor to select slow or fast travel speed Travel Pilot Valves: The valves direct pilot oil to shift the travel valves in the main control valve group The pilot valves are shifted by either pedals or levers Straight travel control valve and solenoid: When both travel control valves are shifted or one travel valve and an implement/swing circuit are activated, the solenoid is energized to provide flow priority to the travel motors Slow Return Check Valve: The back pressure created by the slow return check valve ensures that makeup oil is present at the travel motor and the various makeup valves in the hydraulic system SERV1852-02 08/08 -8- Text Reference Travel Systems 3 Left travel valve (1) and right travel valve (2) are used to control the travel motors The straight travel valve (3) provides flow priority for the Travel Systems during a travel condition The slow return check valve is part of the slow return check valve and cooler bypass manifold (4) The Travel Systems uses foot pedals (5 and 6) or travel levers (7 and 8) to control the direction of machine travel SERV1852-02 08/08 -9- Text Reference Travel Systems 5 Each track is driven by a travel motor (1) A counterbalance valve (2) prevents overspeed while the machine is traveling downhill, prevents shocks to the system when travel is stopped, and helps to prevent motor cavitation Crossover relief valves (3 & 4) are used to protect the travel motor from pressure spikes The upper supply line (5) directs supply oil to the motor for reverse travel, while the lower supply line (6) directs supply oil to the motor for forward travel The final drive is composed of a three-stage planetary gear reduction to reduce the motor speed to drive the track Fill (8) and drain (9) plugs are in the outer cover SERV1852-02 08/08 - 10 - Text Reference Travel Systems The two speed travel solenoid valve (1) is part of the pilot manifold The manifold is located directly below the main control valve The hydraulic activation solenoid (2) must energize to shift the hydraulic activation valve (3) If the hydraulic activation valve is not shifted there is no pilot oil to the the travel pilot valves ... 32 5D FM and 33 0D FM did not change - The 32 5D HD HW did not change into 32 9D HD HW This model is being discontinued However, the 33 0D HD HW changed to the 33 6D HD HW SERV185 2-0 2 08/08 -5 - Text... and Pump are only used on the 33 0D and the 33 6D INTRODUCTION This presentation covers the 32 0D - 33 6D hydraulic excavator Travel Systems Both the drive pump and idler pump are used to provide... testing and adjusting CONTENT This presentation provides an introduction and describes the components and systems operation of the 32 0D - 33 6D hydraulic excavator Travel Systems Additional presentations