Hydraulic line repair data
Current system
Use the number on the diagram, a part number, connection point, length, hose size, or fitting.
Hose repair details
Diagram Pipe No. 52A
Installation route: Installation route — English review pendingOriginal Chinese: 液压油箱~慢速回流阀(大臂)
Diagram Pipe No. 16
Installation route: Hydraulic tank → solenoid valveOriginal Chinese: 液压油箱~电磁阀
Diagram Pipe No. 52
Installation route: Installation route — English review pendingOriginal Chinese: 液压油箱~慢速回流阀(大臂)
No hose in this list matches those words. Clear the box or search another machine.
Workshop guide
For Hitachi EX270LC-5 Hydraulic Tank, 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.
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.
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
Questions appear only when a published record or linked PDF page provides the answer.
Each record keeps the left and right fitting descriptions separate. Current examples: 4375320: left American female thread, 37° internal cone seat; right 90° elbow, American female thread, 37° internal cone seat; 4355423: left American female thread, 37° internal cone seat; right 90° elbow, American female thread, 37° internal cone seat; 9166103: left American female thread, 37° internal cone seat; right 90° elbow, American female thread, 37° internal cone seat. Open the exact part-number or pipe-number record; do not swap ends based on appearance alone.
Yes. Current examples with a diagram pipe number are: Pipe No. 52A (4375320), Pipe No. 16 (4355423), Pipe No. 52 (9166103). Open a record to compare its installation position with the linked manual page.
