36, 37

31

38

32

43

 

Reciprocator Repair

3, 39, 2

When reinstalling cylinder (25), Step 19, be sure

 

port in valve spool (31) and port in the bottom

 

cylinder cap (32) are in line with each other. Be

13*

sure o-rings (13*) are in place in valve spool and

cylinder cap.

 

19. Place cylinder (25) on cylinder cap (32). Install pis- ton (22) and valve assembly (31).

20. Install o-ring (49*) in deep, lower groove of piston (22). Install seal (23*) over o-ring. Install piston bearing (24*) around upper groove of piston. Hold- ing piston bearing in place to avoid damage, slide

 

25

cylinder over piston and press it down.

 

 

 

 

 

21. Install capscrew (3), o-ring (39) and washer (2).

 

 

Install lockwashers (37) and nuts (36). Torque nuts

 

 

to 28 to 32 ft-lb (38 to 43 N.m).

13*

22. Reinstall fluid tube (45) and fittings (1). Torque fit-

tings to 28 to 32 ft-lb (38 to 43 N.m). See Reciproca-

17

 

 

tor Parts drawing, page 18.

20

 

 

.

 

 

18

 

Make sure the displacement rod (35) on the

 

 

 

 

assembled reciprocator is exposed so the pump

 

 

can be connected to it.

35

204

35

ti10605a

FIG. 11

See FIG. 11 for steps 17- 24 except where noted.

17.Place adapter (43) in a vise. Install seals as described on page 10. Install cylinder cap (32).

18.If tie rods (38) were removed, reinstall them with short threaded end up. The other end should be screwed about 9/16” into bottom cylinder cap (32).

ti10610a

FIG. 12

23.To reconnect reciprocator and pump, install o-ring (17). Screw connecting rod (35) into displacement rod (34). Install cotter pin (204). Install a new gasket (202*). Push cylinder up into adapter and engage the threads. Screw in pump using a strap wrench for the final tightening (See FIG. 12 and Pump Parts, page 20).

24.Connect hydraulic supply and return hoses to fit- tings (5, 60).

To reduce risk of static sparking, be sure to recon- nect ground wire before operating pump.

312350E

15

Page 14 Page 16
Page 15
Image 15
Hitachi 312350E important safety instructions When reinstalling cylinder 25, , be sure
Page 14 Page 16

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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