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. 10
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
Diagram Pipe No. 6
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
Diagram Pipe No. 6
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
Diagram Pipe No. 7
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
Diagram Pipe No. 9
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
Diagram Pipe No. 5
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
No hose in this list matches those words. Clear the box or search another machine.
Workshop guide
For Caterpillar CAT®M318 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.
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.
The most frequent raw specifications in the current published records are: DN16；1SN-10；10.5Mpa (17 records), DN6；2SN-4；40Mpa (5 records), DN19；4SP-12；35Mpa (3 records), DN19；6SH-12；42Mpa (1 records). Verify the specification together with length, pressure, and fitting details.
Each record keeps the left and right fitting descriptions separate. Current examples: 179-5706: left 45°美制内螺纹平面密封; right 90° elbow, American female thread, flat-face seal; 149-0037: left American female thread, flat-face seal; right American female thread, flat-face seal; 118-7399: left 45°美制内螺纹平面密封; right American female thread, flat-face seal. 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. 10 (179-5706), Pipe No. 17 (149-0037), Pipe No. 8 (118-7399), Pipe No. 11 (204-0685). Open a record to compare its installation position with the linked manual page.
