Hitachi 312350E important safety instructions Service, Replacing Throat Seals, Relieve pressure

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Service

Service

Use of a hydraulic power supply with fluid tempera- tures above 154°F (68°C) can create hot surfaces which can burn if touched.

•Do not touch pump, motor, or if hydraulic system fluid is above 154°F (68°C).

•Allow sufficient time for pump and motor to cool before attempting any service or repair.

35

11 3

32

Replacing Throat Seals

See FIG. 5.

Replace throat seals if fluid leaks excessively through the weep tube (B), page 4. This procedure can be done without disassembling entire reciprocator.

1.Relieve pressure, page 7.

2.Disconnect reciprocator from pump.

3.Remove four capscrews (15) from bottom of adapter (43). Tap adapter to loosen it and pull it off the bot- tom cap (32).

4.Remove seal (44, included in Reciprocator Repair Kit 247455) from top of adapter (43).

5.Install seal (16) in adapter (43) in the order shown in FIG. 5.

6.Reassemble. Torque the capscrews (15) to 28-32 ft-lb (38 to 43 N.m). Install displacement pump, see Step 23 on page 15.

44 1

19

10

8

27

15 4

ti10463a

1Lips face down.

3

Torque to 54-56 ft-lbs (73-76 N.m).

4

Torque to 170 - 180 in-lbs (19-20 N.m)

FIG. 5

10

312350E

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Contents Table of Contents Dyna-StarFire and Explosion Hazard Moving Parts Hazard Typical Installation of a Suction Feed System InstallationKey Pump Outlet Drain Valve Pump Accessories Hydraulic LinesHydraulic Power Supply Limit Fluid Flow to ReciprocatorGrounding Grounding the PumpPressure Relief Procedure Before Starting Pump OperationShutdown Starting PumpIf the Pump Leaks at the Fluid Fittings Maximum Working PressuresProblem Cause Solution TroubleshootingRelieve pressure, page 7. Check Replacing Throat Seals ServiceRelieve pressure, 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 60aReciprocator Parts Displacement Pump PartsPart No. Description Qty 120# Drum Length Part No. Description Qty Pump PartsModel 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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