Hydraulic line repair data

Hitachi EX550LC-3 Hydraulic Pump Hose List

Coverage details

Hoses: 3 records
Full specifications: 3 records
Systems: 1 systems
Length range: 400–1,400 mm

Current system

Find a hose in this system

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

Pipe number, part number, route, length, or fittingSearch another machine

Hose repair details

Hose Length and Fitting List

Diagram Pipe No. 43

4314397

Installation route: 液压泵左~液压泵右

Length: 700 mm
Specification: DN19;4层纤维-12;3.5MPa
Left fitting: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封
Right fitting: 45°美制内螺纹平面密封

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Diagram Pipe No. 38

4350321

Installation route: 液压泵左~液压泵右

Length: 400 mm
Specification: DN6;1SN-4;7Mpa
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. 11

4309083

Installation route: 液压泵~分配阀(进油)

Length: 1,400 mm
Specification: DN32;6SP-20;34.5MPa
Left fitting: Heavy-series flangeOriginal Chinese: 法兰-重型
Right fitting: 90° heavy-series flangeOriginal Chinese: 90°法兰-重型

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Workshop guide

Finding the correct hydraulic hose for Hitachi EX550LC-3 Hydraulic Pump

Start with the machine and route

For Hitachi EX550LC-3 Hydraulic Pump, 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 EX550LC-3 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

4314397700 mm · DN19;4层纤维-12;3.5MPa · 液压泵左~液压泵右
4350321400 mm · DN6;1SN-4;7Mpa · 液压泵左~液压泵右
43090831,400 mm · DN32;6SP-20;34.5MPa · 液压泵~分配阀(进油)

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 EX550LC-3 Hydraulic Pump?

There are 3 published records. 3 include a length, both end fittings, and a part number or diagram pipe number.

What is the hose length range for Hitachi EX550LC-3 Hydraulic Pump?

Based on published records with valid lengths, the range is 400–1,400 mm. Open the individual record to verify its installation position and both end fittings before fabrication.

Which hose specifications are common for Hitachi EX550LC-3 Hydraulic Pump?

The most frequent raw specifications in the current published records are: DN19;4层纤维-12;3.5MPa (1 records), DN32;6SP-20;34.5MPa (1 records), DN6;1SN-4;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 EX550LC-3 Hydraulic Pump?

Each record keeps the left and right fitting descriptions separate. Current examples: 4314397: left American female thread, flat-face seal; right 45°美制内螺纹平面密封; 4350321: left 美制内螺纹37°内锥; right 90°美制内螺纹37°内锥; 4309083: left Heavy-series flange; right 90° heavy-series flange. Open the exact part-number or pipe-number record; do not swap ends based on appearance alone.

Can I locate a Hitachi EX550LC-3 Hydraulic Pump hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 43 (4314397), Pipe No. 38 (4350321), Pipe No. 11 (4309083). Open a record to compare its installation position with the linked manual page.