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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 SWING SYSTEM Service Training Meeting Guide (STMG) 320D-336D HYDRAULIC EXCAVATORS TIER III ENGINES SWING SYSTEM 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 swing system Additional presentations will cover the machine walkaround, engines, pilot system, main control valve group, implements, swing system, travel system, and tool control systems in more detail This presentation may be used for self-paced and selfdirected training OBJECTIVES After learning the information in this presentation, the technician will be able to: identify the correct operation of the swing system on the 320D-336D hydraulic excavators, and diagnose problems in the swing system 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: 32 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 Swing System TABLE OF CONTENTS INTRODUCTION Swing System Components Swing System Operation 11 Swing Motor Operation 18 Swing Drive 34 CONCLUSION 39 SERV1852-02 08/08 -4- Text Reference Swing System 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 Swing System SWING SYSTEM 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 336D INTRODUCTION This presentation covers the 320D-336D swing system The swing system includes the following components: - swing control valve (part of the main control valve group) - swing motor - variable swing priority valve (part of the swing control valve) - swing priority valve - dual stage, swing line relief valves - cushion crossover anti-reaction valves - fine swing control solenoid valve (not available in EAME after October 2008) - swing brake - slow return check valve The idler pump supplies flow for the swing system The swing control valve is shifted by pilot oil from the joystick pilot valves SERV1852-02 08/08 -6- Swing Brake Swing Motor Group Text Reference Swing System SWING SYSTEM Motor Line Relief Valve SWING COMPONENTS - NEUTRAL Makeup Valve Anti-Reaction Valves Fine Swing Valve Swing / Stick Pilot Valve Out In R Variable Swing Priority Valve Swing Control Valve Stick Control Valve L Idler Pump M Drive Pump Swing Priority Pressure Reducing Valve AEC Pressure Switch Swing Brake Solenoid Slow Return Check Valve Pilot Pump Hydraulic Activation Valve Implement Hydraulic Lockout Solenoid Pilot Manifold Swing System Components The swing circuit controls the rotation of the swing motor The idler pump provides the pump flow for the swing circuit When either one of the joysticks is moved from the NEUTRAL position, the swing parking brake is released The swing motor is mounted on top of the swing drive The swing drive is installed on the upper structure and rotates the upper structure When the hydraulic activation control lever is in the UNLOCKED position, pilot pump oil flows to the swing parking brake solenoid valve in the pilot manifold and to the swing pilot control valve Pilot oil from the pump also flows through the swing priority pressure reducing valve to the variable swing priority valve and moves the variable swing priority valve fully up With the swing control valve in NEUTRAL, pump supply oil from the idler pump flows though the center bypass valve of the swing control valve and all other control valves shown to the NFC valve The return oil creates a signal used to destroke the idler pump SERV1852-02 08/08 -7- Text Reference Swing System The swing brake is currently on so the motor will not rotate Since the implement hydraulic lockout solenoid has been energized, the hydraulic activation valve has shifted Pilot oil is directed to the pilot joystick and to the swing brake solenoid Swing Priority Pressure Reducing Valve and Variable Swing Priority Valve: These two valves work together to provide flow priority over the stick control valve when the stick and swing are operated together Swing Parking Brake Solenoid Valve: When energized the swing parking brake solenoid valve directs pilot oil to release the swing parking brake The solenoid will energize when either one of the joysticks is moved from the NEUTRAL position Dual Stage, Swing Relief Valves: These relief valves limit the maximum pressure in the left and right swing circuits The dual stage, swing relief valves open initially at a lower pressure to reduce jerkiness in the swing circuits at swing start and swing stop or to handle short duration pressure spikes The relief valves also allow for higher swing circuit pressures to provide increased swing force NOTE: The ISO symbol shown on the schematics does not reflect that the relief valves are dual stage Slow Return Check Valve: The back pressure created by the slow return check valve ensures that makeup oil is available at the swing motor and the various makeup valves in the hydraulic system Anti-reaction or Cushion Relief Valves: These valves dampen pressure spikes in the swing system whenever the swing is stopped The valves also inhibit counter rotation of the swing motor when the swing is stopped, which reduces swing "wag." The valves also provide for a smooth swing start-up Fine Swing Control Solenoid Valve: When energized the fine swing control solenoid valve improves the swing control during swing deceleration This solenoid valve helps to reduce the shock when the swing stops by connecting the supply and the return sides of the motor so the pressures between the two sides begin to equalize SERV1852-02 08/08 -8- Text Reference Swing System 3 4 The swing system uses one control valve (1) in the main control valve group (2) to control the swing operation The slow return check valve is part of the slow return check valve and cooler bypass manifold group (3) The left joystick (4) in the cab is used to control the direction and speed of the swing SERV1852-02 08/08 -9- Text Reference Swing System The swing control valve directs oil to and from the swing motor (1) Additional swing motor components shown are the: - swing brake release pressure line (2) - swing drive oil level dipstick (3) - crossover relief valve (4) - anti-reaction valve group (5) - anti-reaction valve (6) (one of two) - fine swing control solenoid valve (7) SERV1852-02 08/08 - 10 - Text Reference Swing System The swing brake solenoid valve (1) is part of the pilot manifold (2) The manifold is located directly below the main control valve The hydraulic activation solenoid (3) must energize to shift the hydraulic activation valve (4) If the hydraulic activation valve is not shifted there is no pilot oil to the swing brake solenoid valve The swing brake can not be released There is also no pilot oil available to the joystick pilot valves if the hydraulic activation valve is not shifted The swing priority pressure reducing valve (5) is located beneath the main control valve group The variable swing priority valve (not shown) is located on the main control valve group near the boom spool ... 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... excavators, and diagnose problems in the swing system REFERENCES 32 0D Hydraulic Excavator Specalog 32 3D L and 32 3D LN Hydraulic Excavators 32 4D Hydraulic Excavator Specalog 32 5D Hydraulic Excavator... 32 8D Hydraulic Excavator Specalog 33 0D Hydraulic Excavator Specalog Machine Monitoring System - Systems Operation Self-study "30 0D Series Hydraulic Excavators, 345C Hydraulic Excavator, and 365C