Daewoo Doosan 430 440 Plus 450 460 470 Plus Series Skid Steer Loader Shop Manual – PDF DOWNLOAD
DESCRIPTION:
Daewoo Doosan 430 440 Plus 450 460 470 Plus Series Skid Steer Loader Shop Manual – PDF DOWNLOAD
Shop Manual
K1025179E
Serial Number 5001 and Up
430Series, 440Plus, 450Series,
460Series, 470Plus
- The hydraulic gear pump (3) is driven by a shaft through HST pump (15). The fluid flows from the hydraulic tank (2) to the hydraulic pump (3), then goes from the hydraulic gear pump (3) to control valve (8). This hydraulic gear pump (3) draws the fluid from hydraulic tank (2) and charges the hydraulic system with hydraulic power converted the engine power.
- When the joystick lever-RH (7) is in neutral position, all spools of control valve is in neutral position and the fluid goes through control valve and oil cooler (11) and return filter (12), and back to hydraulic tank (2), then some of return flow was drawn by charging pump (4). When joystick lever is shifted to any direction to move the cylinders (9, 10), and the fluid from charging pump (4) goes through a feeding unit to the bottom valve of joystick lever (7), and the modulated pressure from the bottom valve transferred to the respective pilot port of control valve is proportional to a stroke of joystick lever or electric rocker switch on joystick-RH (7) is activated, the fluid goes out the respective work port of control valve (8) and to either the base end of cylinders (9, 10) or the rod end of cylinders or attachment is operated. As the fluid goes into the end of cylinders (9, 10), the fluid from the other side of cylinder flows back into control valve.
- The control valve (8) has an adjustable relief valve. When the cylinders (9, 10) reach the end of the stroke, the fluid pressure reaches the setting pressure of relief valve(Refer to specification), it will open and let the fluid by-pass the hydraulic circuit internally and go to the oil cooler (11) and return filter (12). When the joystick lever-RH (7) returns to the neutral position and the spool position is in neutral position, there is some fluid available for the other sections of the control valve (8).
- Two cylinders can be used at the same time by moving diagonally joystick-RH (7) from any respective single direction of joystick lever as long as the main relief valve is not open. The return filter (12) has a built-in by-pass valve (50 psi check Valve and 40 psi pressure switch) to allow fluid to flow when the fluid does not go through the filter element (plugged). The oil cooler (11) and check valve (16) are installed in parallel.
- The check valve (16) will be opened to protect oil cooler (11) when the fluid is cold or the boom is quickly lowered. On raising fully the seat bar to leave a seat, which let seat bar push an electric switch, the feeding unit is electrically activated by this electric switch, and then the system pressure of joystick- RH (7) is unloaded.
- Thus, when operator leaves a seat after raising a seat bar, any cylinders won’t work even though the joystick lever is moved to any direction.. On the emergency situation that engine is off while lifting boom cylinder, the boom cylinder can be lowered safely by loosening the screw of the needle valve (13). Figure
IMPORTANT SAFETY INFORMATION:
- Most accidents involving product operation, maintenance and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs.
- A person must be alert to potential hazards. This person should also have the necessary training, skills and tools to perform these functions properly. Read and understand all safety precautions and warnings before operating or performing lubrication, maintenance and repair on this product.
- Basic safety precautions are listed in the “Safety” section or the Service or Technical Manual. Additional safety precautions are listed in the “Safety” section of the owner/operation/maintenance publication.
- Specific safety warnings for all these publications are provided in the description of operations where hazards exist. WARNING labels have also been put on the product to provide instructions and to identify specific hazards.
- If these hazard warnings are not heeded, bodily injury or death could occur to you or other persons. Warnings in this publication and on the product labels are identified by the following symbol.
TABLE OF CONTENTS:
Daewoo Doosan 430 440 Plus 450 460 470 Plus Series Skid Steer Loader Shop Manual – PDF DOWNLOAD
Hydraulic Systems…………………………………………………………………….. SP000810
Vehicle Systems ……………………………………………………………………….. SP000811
Electric Systems ……………………………………………………………………….. SP000812
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PLEASE NOTE:
- This is the same manual used by the dealers to diagnose and troubleshoot your vehicle
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