Hitachi 312350E Pump Accessories Hydraulic Lines, Hydraulic Power Supply, Pump Outlet Drain Valve

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Installation

Pump Accessories

Hydraulic Lines

Follower Plate (A): ensures a good prime. Place follower plate on grease and rotate while pressing firmly to level material. Order part number 247700 for 60# and 90# automatic lube pump modules; 247701 for 120# refinery reservoir; or 247702 for 400# refinery reservoir.

Pump Outlet Drain Valve

•A pump outlet drain (D) is required in your system. This valve helps relieve pressure in the displace- ment pump and hose when shutting down system and in case of a clogged outlet hose. Install valve close to pump outlet.

•Mount pump securely so it cannot move around during operation. Failure to do so could result in personal injury and/or equipment damage.

Pump Outlet Drain Valve (D): helps relieve fluid pressure in pump when pump is shut off. Install valve close to pump fluid outlet. Order valve, Part No. 111229.

Hydraulic Power Supply

See FIG. 1.

Limit Fluid Flow to Reciprocator

To reduce the risk of overpressurizing the hydraulic reciprocator which could cause a rupture and serious injury, including fluid injection, a hydraulic system must have a means to limit the incoming fluid flow to the reciprocator to a maximum of 3 gpm (11 lpm) and 600 psi (4.1 MPa, 41 bar). See description below.

The hydraulic power supply system (U) must have a pressure reducing valve and a pressure-compensated flow control. A flow control valve (Q) is required to limit the incoming flow to the reciprocator to a maximum of 3 gpm (11 lpm).

Pressure gauge (M), pressure reducing valve (N) and a flow control valve (Q) are included in the Hydraulic Fluid Control Kit 247538 or 247705, which can be ordered separately.

Shut-off Valves (H, L): installed on the hydraulic supply and return lines. Order Part No. 108537 and 112578.

Drain Line: Monitor the weepage of hydraulic fluid or lubricant. If it seems excessive or increases suddenly, the reciprocator/pump seals may need to be changed. See FIG. 2.

ti10602a

FIG. 2

Hoses: Use a minimum 1/2 inch supply line (R) and minimum 3/4 inch return line (F) on the reciprocator. Contact your Graco representative for details of line sizing.

Pressure Reducing Valve (N): circulates excess hydraulic fluid pressure back to the hydraulic power supply. Install this valve (N) in the hydraulic supply line with a drain hose (W) teed into the hydraulic return line

(F). Limit supply pressure to a maximum 600 psi (4.1 MPa, 41 bar).

Accumulator (P): reduces hammering effect caused by the motor when it reverses direction.

Fluid-filled Pressure Gauge (M), Part No. 112567: monitors hydraulic pressure to the reciprocator during startup. See FIG. 1. Use the gauge for initial adjustment of the reciprocator. It can be removed after adjustment.

312350E

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Contents Dyna-Star Table of ContentsFire and Explosion Hazard Moving Parts Hazard Key InstallationTypical Installation of a Suction Feed System Hydraulic Power Supply Pump Accessories Hydraulic LinesPump Outlet Drain Valve Limit Fluid Flow to ReciprocatorGrounding the Pump GroundingOperation Pressure Relief Procedure Before Starting PumpIf the Pump Leaks at the Fluid Fittings Starting PumpShutdown Maximum Working PressuresRelieve pressure, page 7. Check TroubleshootingProblem Cause Solution Relieve pressure, ServiceReplacing Throat Seals Disconnecting Reciprocator and Displacement Pump Drain Oil Out of Reciprocator Reciprocator RepairAllow 24 hours to cure before operating reciprocator Assembly a When reinstalling cylinder 25, , be sure Disassembly Displacement Pump RepairAssembled / Cutaway View 60a Reciprocator PartsPart No. Description Qty Displacement Pump PartsReciprocator Parts Model Pump Parts120# Drum Length Part No. Description Qty 400# Drum Length Part No. Description QtyTypical Fluid Outlet Pressure Technical DataDimensions and Mounting Hole Layout 312350E Graco Information Graco Standard Warranty

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.
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