Hydraulic line repair data

Hitachi EX120-5 Attachments – Lock Valve Hose List

Coverage details

Hoses: 5 records
Full specifications: 5 records
Systems: 1 systems
Length range: 360–1,200 mm

Current system

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Use the number on the diagram, a part number, connection point, length, hose size, or fitting.

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Hose repair details

Hose Length and Fitting List

Diagram Pipe No. 11

4326966

Installation route: Left boom-cylinder lock valve → right boom-cylinder lock valveOriginal Chinese: 左大臂油缸锁止阀~右大臂油缸锁止阀

Length: 400 mm
Specification: DN6;2SN-4;68.5MPa
Left fitting: 90°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. 18

4327439

Installation route: Left boom-cylinder lock valve → right boom-cylinder lock valveOriginal Chinese: 左大臂油缸锁止阀~右大臂油缸锁止阀

Length: 360 mm
Specification: DN10;1SN-6;7Mpa
Left fitting: 90°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. 61A

4370733

Installation route: 铁管(锁止阀)~回油铁管(分配阀)

Length: 1,200 mm
Specification: DN19;1SN-12;7MPa
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

4326966

Installation route: Left boom-cylinder lock valve → right boom-cylinder lock valveOriginal Chinese: 左大臂油缸锁止阀~右大臂油缸锁止阀

Length: 400 mm
Specification: DN6;2SN-4;68.5MPa
Left fitting: 90°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. 61

9192146

Installation route: 铁管(锁止阀)~回油铁管(分配阀)

Length: 1,200 mm
Specification: DN19;1SN-12;7MPa
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

View full repair specifications

Workshop guide

Finding the correct hydraulic hose for Hitachi EX120-5 Attachments – Lock Valve

Start with the machine and route

For Hitachi EX120-5 Attachments – Lock Valve, identify the exact model and hydraulic system on the machine first. A part number or diagram pipe number is the fastest way to narrow a replacement hose; if neither is visible, compare the installation route and the existing hose.

See all Hitachi EX120-5 systems

Read the dimensions before cutting

Check whether a listed dimension is finished assembly length, hose-only length, or cut length. These are not interchangeable. Confirm hose specification and pressure rating, then compare both ends separately: thread, sealing seat, size, angle, and orientation.

Records to compare

4326966400 mm · DN6;2SN-4;68.5MPa · Left boom-cylinder lock valve → right boom-cylinder lock valve
4327439360 mm · DN10;1SN-6;7Mpa · Left boom-cylinder lock valve → right boom-cylinder lock valve
43707331,200 mm · DN19;1SN-12;7MPa · 铁管(锁止阀)~回油铁管(分配阀)

Use the drawing as a location check

Where an installation drawing or manual figure is available, match its callout to the part number and physical route. A hydraulic circuit diagram explains connections but does not show the exact routing of a hose on the machine. Take the old hose or clear end-fitting photographs to the workshop if any dimension is missing.

Based on current published data

Common Repair Questions

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

How many hoses are currently listed for Hitachi EX120-5 Attachments – Lock Valve?

There are 5 published records. 5 include a length, both end fittings, and a part number or diagram pipe number.

What is the hose length range for Hitachi EX120-5 Attachments – Lock Valve?

Based on published records with valid lengths, the range is 360–1,200 mm. Open the individual record to verify its installation position and both end fittings before fabrication.

Which hose specifications are common for Hitachi EX120-5 Attachments – Lock Valve?

The most frequent raw specifications in the current published records are: DN19;1SN-12;7MPa (2 records), DN6;2SN-4;68.5MPa (2 records), DN10;1SN-6;7Mpa (1 records). Verify the specification together with length, pressure, and fitting details.

How can I identify the left and right hose fittings for Hitachi EX120-5 Attachments – Lock Valve?

Each record keeps the left and right fitting descriptions separate. Current examples: 4326966: left 90°美制内螺纹37°内锥; right 90°美制内螺纹37°内锥; 4327439: left 90°美制内螺纹37°内锥; right 90°美制内螺纹37°内锥; 4370733: left American female thread, flat-face seal; right American female thread, flat-face seal. Open the exact part-number or pipe-number record; do not swap ends based on appearance alone.

Can I locate a Hitachi EX120-5 Attachments – Lock Valve hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 11 (4326966), Pipe No. 18 (4327439), Pipe No. 61A (4370733), Pipe No. 11 (4326966). Open a record to compare its installation position with the linked manual page.