Hitachi 312350E Troubleshooting, Problem Cause Solution, Relieve pressure, page 7. Check

Page 9

 

 

Troubleshooting

Troubleshooting

 

 

 

 

 

Problem

Cause

Solution

 

 

 

 

 

 

Pump does not run.

Closed dispense valve.

Pump only runs with valve open.

 

 

 

 

Pressure too low.

Increase supply pressure using a

 

 

pressure adjusting valve.

 

 

 

 

Insufficient hydraulic fluid supply.

Check hydraulic supply. Adjust to a

 

 

maximum of 3 gpm (11 lpm) flow.

 

 

 

 

Clogged fluid outlet line, intake valve,

Relieve pressure, page 7. Check.

 

dispense valve, suction line.

Clear obstructions.

 

 

 

 

Reciprocator damaged.

Repair.

 

 

 

Pump speeds up or runs erratically.

Pump piston and/or intake valve

Relieve pressure, page 7. Check

 

worn.

and repair.

 

 

 

 

Empty supply container.

Refill and repair. Do not allow pump

 

 

to run dry. Monitor closely or use a

 

 

low-level cutoff valve.

 

 

 

Pump runs but output low on up

Pump piston and/or intake valve

Relieve pressure, page 7. Check

and/or down stroke.

worn.

and repair.

 

 

 

Pump run but output low on both up

Insufficient hydraulic fluid supply.

Check hydraulic supply. Adjust to

and down strokes.

 

maximum 3 gpm (11 lpm) flow.

 

 

 

 

Pressure too low.

Increase supply pressure using a

 

 

pressure adjusting valve.

 

 

 

 

Clogged fluid outlet line, intake valve,

Relieve pressure, page 7. Check.

 

dispense valve, suction line.

Clear obstructions.

 

 

 

Excessive weepage from weep tube

Worn throat packings.

Repair.

(B), page 4.

 

 

Worn displacement seal.

Repair.

 

 

 

 

Hydraulic oil leaks from fittings in the

Fittings 1, 5, 58, (Parts, page 18), are

Tighten the self-sealing fittings. If

upper or lower reciprocator blocks

loose, or their o-rings are worn or

leaking persists, change o-rings.

(31, 32) [Parts page 18].

damaged.

 

 

 

 

312350E

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Contents Dyna-Star Table of ContentsFire and Explosion Hazard Moving Parts Hazard Installation Typical Installation of a Suction Feed SystemKey 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 PressuresTroubleshooting Problem Cause SolutionRelieve pressure, page 7. Check Service Replacing Throat SealsRelieve pressure, 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 PartsDisplacement Pump Parts Reciprocator PartsPart No. Description Qty 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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