Operation

Operation

Pressure Relief Procedure

 

 

Before Starting Pump

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The system pressure must be manually relieved to prevent the system from starting or dispensing accidentally. Follow this pressure relief procedure whenever you are instructed to:

•relieve pressure.

•check or service any system equipment.

•install or clean nozzle.

For the following instructions, see FIG. 1.

1.Shut off hydraulic power supply.

2.Close supply line shut-off valve (L).

3.Open dispensing valve to relieve pressure.

4.Open pump outlet drain valve. Have a container ready to catch drainage.

5.Close return line shut-off valve (H).

Leave drain valve open until you are ready to dispense again.

If you suspect the nozzle or hose is completely clogged or that pressure has not been fully relieved after following steps 1-5 above, very slowly loosen the hose end coupling to relieve pressure, then clear obstruction.

COMPONENT RUPTURE HAZARD Overpressurizing any component can result in serious injury or property damage as a result of rupture, fire, and/or explosion.The maximum working pressure of each component in the system may not be the same. To reduce the risk of overpressurizing any component in the system:

•Be sure you know the maximum working pressure of each component.

•Never exceed the maximum working pressure of the lowest rated component in the system.

•Do not exceed the maximum pump cycle rate.

•The pump has a rated ratio of 10:1. However, it is capable of reaching stall pressures equal to 12.5 times the hydraulic input pressure. To calculate the fluid output pressure, multiply the hydraulic pressure shown on the hydraulic control module gauge by 12.5.

For example:

600 psi hydraulic x 12.5 = 7500 psi fluid output

4.14MPa hydraulic x 12.5 = 51.8 MPa fluid output

41.4 bar hydraulic x 12.5 = 5.18 bar fluid output

•Regulate hydraulic pressure to the pump so that no fluid line component or accessory is overpressurized.

•Check hydraulic fluid level in hydraulic power supply before each use. Add fluid as necessary to fill the lines.

•Flush pump before using it for the first time to remove the light oil that was left in after factory test- ing to protect pump from corrosion. Be sure solvent used is compatible with the fluid to be pumped and the pump’s wetted parts. See Technical Data, page 20. Flush until clean solvent comes out of hose.

312350E

7

Page 6 Page 8
Page 7
Image 7
Hitachi 312350E important safety instructions Operation, Pressure Relief Procedure Before Starting Pump
Page 6 Page 8

312350E specifications

The Hitachi 312350E is a cutting-edge excavator designed for heavy-duty applications in the construction and mining industries. This powerful machine stands out due to its robust design and advanced technological features that enhance productivity, efficiency, and operator comfort.

One of the key characteristics of the Hitachi 312350E is its powerful engine, which delivers exceptional performance while adhering to strict emissions regulations. The high-output engine ensures that the excavator can handle demanding tasks with ease, whether it's digging, lifting, or moving heavy materials. Coupled with a precise hydraulic system, the machine provides smooth and responsive control, allowing operators to perform operations more effectively.

In terms of design, the Hitachi 312350E features a spacious and ergonomic cab that prioritizes operator comfort. The well-designed layout includes adjustable seating, intuitive controls, and excellent visibility, which significantly reduces fatigue during long working hours. The advanced air conditioning system and noise-reducing materials contribute further to a pleasant working environment.

The 312350E is equipped with several advanced technologies that enhance its operational capabilities. Among these features is the Intelligent Machine Control system, which allows for automated digging and grading. This technology increases precision, reduces material waste, and ensures optimal results in various tasks. Furthermore, the machine’s onboard diagnostic system provides real-time insights, helping operators manage maintenance and reduce downtime.

Safety is also a top priority with the Hitachi 312350E. The excavator comes with several protective features such as reinforced structures, a ROPS/FOPS-certified cab, and advanced lighting systems for visibility in low-light conditions. These attributes make it suitable for various job sites, whether urban, rural, or construction-focused.

Finally, the Hitachi 312350E boasts impressive fuel efficiency, which not only reduces operational costs but also minimizes environmental impact. Its design emphasizes sustainability without compromising on performance, making it an ideal choice for contractors looking to balance productivity with environmental responsibility.

Overall, the Hitachi 312350E is a powerful, efficient, and user-friendly excavator that meets the rigors of modern construction and excavation applications. With its blend of advanced technology, comfort, and safety features, it stands as a testament to Hitachi's commitment to quality and innovation in heavy machinery.
Top Page Image Contents