Hitachi 312350E Starting Pump, If the Pump Leaks at the Fluid Fittings, Shutdown

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Operation

Starting Pump

1.Turn on hydraulic power supply.

2.Open return line shut-off valve (H) first, then slowly open the hydraulic supply shut-off valve (L).

3.Adjust flow control valve (Q) to limit the hydraulic flow to no more than 3 gpm (11 lpm), which is approximately 60 cycles per minute.

4.Adjust pressure reducing valve (N) to increase hydraulic inlet pressure from 50 to 600 psi (0.34 to 4.1 MPa, 3.4 to 41 bar).

•Increasing inlet pressure, increases outlet pres- sure.

•Decreasing inlet pressure, decreases outlet pressure.

5.Open drain valve while priming pump.

6.When pump is primed, close drain valve.

Always use lowest pressure possible to obtain desired results. This reduces pump wear.

Maximum Working Pressures

To reduce the risk of serious injury, including fluid injection and splashing in the eyes or on the skin, which may be caused if a component ruptures:

•Never exceed 600 psi (4.1 MPa, 41 bar) Maxi- mum Hydraulic Pressure to the reciprocator.

•Never exceed 7500 psi (51 MPa, 517 bar) Maxi- mum Outlet Pressure from the displacement pump.

•Accessories added to the pump fluid outlet side should have at least a 7500 psi (51 MPa, 517 bar) Maximum Working Pressure.

•Read and understand COMPONENT RUP- TURE HAZARD instructions, page 7.

If the Pump Leaks at the Fluid Fittings

Tighten fittings (1, 5, 60) which are self-sealing and have replaceable o-rings. If leaking persists, change o-rings.

sealing

fitting (1, 5, 60)

reciprocator

o-ring

(1a, 5a,60a)

ti04478

FIG. 4

Shutdown

Relieve pressure, page 7, whenever you shutdown.

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312350E

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Contents Table of Contents Dyna-StarFire and Explosion Hazard Moving Parts Hazard Key InstallationTypical Installation of a Suction Feed System Pump Accessories Hydraulic Lines Hydraulic Power SupplyPump Outlet Drain Valve Limit Fluid Flow to ReciprocatorGrounding Grounding the PumpPressure Relief Procedure Before Starting Pump OperationStarting Pump If the Pump Leaks at the Fluid FittingsShutdown Maximum Working PressuresRelieve pressure, page 7. Check TroubleshootingProblem Cause Solution Relieve pressure, ServiceReplacing Throat Seals Disconnecting Reciprocator and Displacement Pump Reciprocator Repair Drain Oil Out of ReciprocatorAllow 24 hours to cure before operating reciprocator Assembly a When reinstalling cylinder 25, , be sure Displacement Pump Repair DisassemblyAssembled / Cutaway View Reciprocator Parts 60aPart No. Description Qty Displacement Pump PartsReciprocator Parts Pump Parts Model120# Drum Length Part No. Description Qty 400# Drum Length Part No. Description QtyTechnical Data Typical Fluid Outlet PressureDimensions and Mounting Hole Layout 312350E Graco Standard Warranty Graco Information

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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