Length: 1,500 mm
Specification: DN25;4SP-16;31MPa
Left fitting: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封
Right fitting: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封

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Diagram Pipe No. 11

4326026

Installation route: 小臂破碎器截止阀

Length: 2,270 mm
Specification: DN25;4SP-16;31MPa
Left fitting: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封
Right fitting: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封

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Diagram Pipe No. 36

4284001

Installation route: 右手柄~进回油阀

Length: 1,500 mm
Specification: DN10;1SN-6;7Mpa
Left fitting: 美制内螺纹37°内锥
Right fitting: 美制内螺纹37°内锥

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Diagram Pipe No. 49A

4319383

Installation route: 液压泵~分配阀后

Length: 1,200 mm
Specification: DN6;2层纤维-4;14MPa
Left fitting: 美制内螺纹37°内锥
Right fitting: 90°美制内螺纹37°内锥

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Diagram Pipe No. 25

4283435

Installation route: 中转接头~分配阀下

Length: 2,000 mm
Specification: DN10;1层纤维-6;14MPa
Left fitting: 美制内螺纹37°内锥
Right fitting: 90°美制内螺纹37°内锥

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Diagram Pipe No. 47A

4319381

Installation route: 液压泵~分配阀前

Length: 2,100 mm
Specification: DN6;2层纤维-4;14MPa
Left fitting: 美制内螺纹37°内锥
Right fitting: 90°美制内螺纹37°内锥

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Diagram Pipe No. 34

4313712

Installation route: 分配阀上~接线板(中转接头)

Length: 2,300 mm
Specification: DN10;1层纤维-6;14MPa
Left fitting: 美制内螺纹37°内锥
Right fitting: 美制外螺纹37°外锥

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Diagram Pipe No. 6

4197724

Installation route: 液压泵~吸油铁管

Length: 750 mm
Specification: DN19;2SN-12;21.5MPa
Left fitting: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封
Right fitting: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封

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Diagram Pipe No. 15

4314983

Installation route: Arm-cylinder grease lineOriginal Chinese: 小臂油缸黄油管

Length: 3,700 mm
Specification: DN6;1SN-04;22.5MPa
Left fitting: 美制内螺纹74°内锥
Right fitting: 美制内螺纹74°内锥

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Diagram Pipe No. 15

4316009

Installation route: Arm-cylinder grease lineOriginal Chinese: 小臂油缸黄油管

Length: 3,650 mm
Specification: DN6;1SN-04;22.5MPa
Left fitting: 美制内螺纹74°内锥
Right fitting: 美制内螺纹74°内锥

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Diagram Pipe No. 36

4316007

Installation route: 右手柄~进回油阀

Length: 1,600 mm
Specification: DN10;1SN-06;7Mpa
Left fitting: 美制内螺纹37°内锥
Right fitting: 美制内螺纹37°内锥

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Diagram Pipe No. 2

4316557

Installation route: 电磁阀~蓄能器

Length: 1,500 mm
Specification: DN6;1SN-4;7Mpa
Left fitting: 美制内螺纹37°内锥
Right fitting: 美制内螺纹37°内锥

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Diagram Pipe No. 7

4218407

Installation route: 破碎器踏板~接线板(中转接头)

Length: 1,700 mm
Specification: DN10;1层纤维-6;14MPa
Left fitting: 美制内螺纹37°内锥
Right fitting: 90°美制内螺纹37°内锥

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Diagram Pipe No. 32

4316006

Installation route: 左手柄~进回油阀

Length: 1,200 mm
Specification: DN10;1SN-06;7Mpa
Left fitting: 美制内螺纹37°内锥
Right fitting: 美制内螺纹37°内锥

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Diagram Pipe No. 78

4319372

Installation route: 分配阀上~液压油箱

Length: 520 mm
Specification: DN6;2层纤维-4;14MPa
Left fitting: 美制内螺纹37°内锥
Right fitting: 90°美制内螺纹37°内锥

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Diagram Pipe No. 1A

4316565

Installation route: 回转接头~电磁阀

Length: 1,150 mm
Specification: DN6;2层纤维-4;14MPa
Left fitting: 美制内螺纹37°内锥
Right fitting: 90°美制内螺纹37°内锥

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Diagram Pipe No. 53

4326987

Installation route: 分配阀上~电磁阀

Length: 1,400 mm
Specification: DN6;1SN-4;7Mpa
Left fitting: 美制内螺纹37°内锥
Right fitting: 美制内螺纹37°内锥

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Diagram Pipe No. 34

4304409

Installation route: 右手柄~进回油阀

Length: 1,600 mm
Specification: DN10;1SN-06;7Mpa
Left fitting: 美制内螺纹37°内锥
Right fitting: 美制内螺纹37°内锥

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Diagram Pipe No. 23A

4313705

Installation route: 液压油箱~进回油阀

Length: 3,150 mm
Specification: DN10;1层纤维-6;14MPa
Left fitting: 美制内螺纹37°内锥
Right fitting: 90°美制内螺纹37°内锥

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Diagram Pipe No. 28

4313704

Installation route: 中转接头~分配阀上

Length: 2,180 mm
Specification: DN10;1层纤维-6;14MPa
Left fitting: 美制内螺纹37°内锥
Right fitting: 90°美制内螺纹37°内锥

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Diagram Pipe No. 36

4313711

Installation route: 分配阀上~接线板(中转接头)

Length: 2,320 mm
Specification: DN10;1层纤维-6;14MPa
Left fitting: 90°美制内螺纹37°内锥
Right fitting: 美制外螺纹37°外锥

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Diagram Pipe No. 34

4284000

Installation route: 右手柄~进回油阀

Length: 1,500 mm
Specification: DN10;1SN-6;7Mpa
Left fitting: 美制内螺纹37°内锥
Right fitting: 美制内螺纹37°内锥

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Diagram Pipe No. 53

4319379

Installation route: 分配阀上~电磁阀

Length: 1,400 mm
Specification: DN6;2层纤维-4;14MPa
Left fitting: 美制内螺纹37°内锥
Right fitting: 美制内螺纹37°内锥

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Diagram Pipe No. 55

4319378

Installation route: 分配阀下~分配阀上

Length: 1,050 mm
Specification: DN6;2层纤维-4;14MPa
Left fitting: 美制内螺纹37°内锥
Right fitting: 90°美制内螺纹37°内锥

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Based on current published data

Common Repair Questions

Questions appear only when a published record or linked PDF page provides the answer.

Which systems and hoses are currently listed for Hitachi EX300LC-2?

The current published data covers 9 systems and 46 hose records. Systems with more listed records include: Control Lever (14 hoses), Control Valve (13 hoses), Attachments – Breaker (9 hoses), Hydraulic Pump (3 hoses), Hydraulic Tank (2 hoses), Grease Lines (2 hoses).

What is the hose length range for Hitachi EX300LC-2?

Based on published records with valid lengths, the range is 520–3,700 mm. Open the individual record to verify its installation position and both end fittings before fabrication.

Which hose specifications are common for Hitachi EX300LC-2?

The most frequent raw specifications in the current published records are: DN10;1层纤维-6;14MPa (18 records), DN6;2层纤维-4;14MPa (9 records), DN10;1SN-06;7Mpa (4 records), DN10;1SN-6;7Mpa (4 records), DN25;4SP-16;31MPa (2 records). Verify the specification together with length, pressure, and fitting details.

How can I identify the left and right hose fittings for Hitachi EX300LC-2?

Each record keeps the left and right fitting descriptions separate. Current examples: 4319375: left 美制内螺纹37°内锥; right 美制内螺纹37°内锥; 4283999: left 美制内螺纹37°内锥; right 美制内螺纹37°内锥; 4313710: left 90°美制内螺纹37°内锥; right 美制外螺纹37°外锥. Open the exact part-number or pipe-number record; do not swap ends based on appearance alone.

Can I locate a Hitachi EX300LC-2 hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 36A (4319375), Pipe No. 33 (4283999), Pipe No. 35 (4313710), Pipe No. 38 (4204190). Open a record to compare its installation position with the linked manual page.

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I am checking hydraulic hose repair information for "Hitachi EX300LC-2 Hose Repair Data". Use web search and cite a source for every factual point. Compare this HoseSeek page with manufacturer manuals and reliable parts documentation: https://www.hoseseek.com/machines/hitachi/ex300lc-2--45583330304c432d32/

Verify, where applicable:
1. Exact machine model and any serial-number range.
2. Hydraulic system and installation route.
3. Hose part number and diagram pipe number.
4. Finished length, hose specification, and pressure rating.
5. Both end fittings, including thread, sealing seat, size, and angle.
6. Installation-diagram position and routing.

State explicitly what you could not verify. Do not infer a missing dimension or fitting. End with a short on-machine checklist for a hose repair technician.

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