The hydraulic system of a diesel forklift truck refers to the intricate network of components and fluid lines that enable the smooth and efficient operation of various lift and movement functions. Key elements within this system work together to convert the mechanical power generated by the diesel engine into hydraulic energy, which is then utilized to control the lifting, tilting, and steering mechanisms of the forklift. Here is a detailed overview of the diesel forklift's hydraulic system :
1. Diesel Engine: The primary source of power for the hydraulic system, a diesel engine converts fuel into mechanical energy through combustion.
2. Hydraulic Pump: Typically a gear pump or a vane pump, it draws hydraulic fluid from the reservoir and converts the rotary motion of the engine into hydraulic pressure. The pump supplies pressurized fluid to the rest of the system as needed.
3. Reservoir (Hydraulic Tank): A storage vessel containing hydraulic oil, which serves as the medium for transmitting power within the system. It also houses filters to remove contaminants and maintains the oil's temperature within an optimal range.
4. Filters: Located either in the return line or directly on the reservoir, filters remove impurities from the hydraulic fluid to prevent damage to sensitive components and maintain system efficiency.



5.Hydraulic Motors (for powered steering): In some forklifts, a hydraulic motor may be used to provide power-assisted steering, converting hydraulic pressure into rotary motion to turn the front wheels.
6. Pressure Relief Valve: A safety feature designed to limit the maximum pressure within the system, preventing overloading and potential component failure.
7. Directional Control Valve (DCV) or Selector Valve: Allows the operator to choose the direction of fluid flow within the system, enabling the raising, lowering, and tilting actions of the forklift.
The diesel engine drives the hydraulic pump, which pressurizes the hydraulic fluid drawn from the reservoir. This pressurized fluid is directed through the control valves according to the operator's commands. When the operator initiates a lifting or tilting action, the corresponding valve opens, allowing the pressurized fluid to enter the appropriate cylinder. The fluid acts on the cylinder's piston, causing it to extend or retract, thus moving the forks or tilting the mast.
Technical Specification
Model | FD70 | ||
Power Type | Diesel | ||
Rated Capacity | kg | 7000 | |
Load Centre | mm | 600 | |
Lift Height | mm | 3000 | |
Fork Size | mm | 1220×150×70 | |
Mast Tilt Angle | 6°/12° | ||
Fork Overhang (Wheel center to fork face) | mm | 595 | |
Ground Clearance(Bottom of mast) | mm | 200 | |
Length to face of fork(Without fork) | mm | 3440 | |
Overall Width | mm | 2010 | |
Mast Lowered Height | mm | 2500 | |
Mast Extended Height(With backrest) | mm | 4415 | |
Overhead Guard Height | mm | 2430 | |
Turning Radius (outside) | mm | 3250 | |
Travel (Full load) | Km/h | 28 | |
Lifting (Full load) | mm/s | 430 | |
Max.Gradeability | % | 20 | |
Wheelbase | mm | 5800 | |
Engine model | 6BG1-02 | ||
Manufacture | ISUZU | ||
Rated output/r.p.m. | KW | 82.4/2000 | |
Rated torque/r.p.m. | N.M | 416/1600 | |
No.of Cylinder | 6 | ||
Bore×Stroke | mm | 105×125 | |
Displacement | cc | 6494 | |
Fuel Tank Capacity | L | 125 |
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