Hydraulic line repair data

Caterpillar CAT®318F L Boom Assembly Hose List

Coverage details

Hoses: 9 records
Full specifications: 9 records
Systems: 1 systems
Length range: 670–1,550 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. 12

392-4730

Installation route: Arm cylinder — rightOriginal Chinese: 小臂油缸右

Length: 820 mm
Specification: DN25；6SH-16；42Mpa
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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Diagram Pipe No. 1

187-5954

Installation route: 大臂左3

Length: 1,150 mm
Specification: DN19；6SH-12；42Mpa
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. 3

269-9589

Installation route: 大臂左1

Length: 1,190 mm
Specification: DN25；6SH-16；42Mpa
Left fitting: Heavy-series flangeOriginal Chinese: 法兰-重型
Right fitting: 45°美制内螺纹平面密封

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Diagram Pipe No. 1

5I-4494

Installation route: 铲斗油缸(规格1)

Length: 1,550 mm
Specification: DN19；6SH-12；42Mpa
Left fitting: 90° heavy-series flangeOriginal Chinese: 90°法兰-重型
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. 9

266-1210

Installation route: Arm cylinder — leftOriginal Chinese: 小臂油缸左

Length: 850 mm
Specification: DN25；6SH-16；42Mpa
Left fitting: Heavy-series flangeOriginal Chinese: 法兰-重型
Right fitting: Heavy-series flangeOriginal Chinese: 法兰-重型

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Diagram Pipe No. 9

477-0615

Installation route: 大臂左3

Length: 670 mm
Specification: DN25；1SN-16；7Mpa
Left fitting: 90° elbow, American female thread, flat-face sealOriginal Chinese: 90°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. 3

184-9543

Installation route: 大臂油缸

Length: 690 mm
Specification: DN16；6SH-10；42Mpa
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. 4

269-9593

Installation route: 大臂左2

Length: 1,130 mm
Specification: DN25；6SH-16；42Mpa
Left fitting: Heavy-series flangeOriginal Chinese: 法兰-重型
Right fitting: 45°美制内螺纹平面密封

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Diagram Pipe No. 1

4I-8785

Installation route: 铲斗油缸(规格2)

Length: 1,400 mm
Specification: DN19；6SH-12；42Mpa
Left fitting: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封
Right fitting: 90° heavy-series flangeOriginal Chinese: 90°法兰-重型

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Workshop guide

Finding the correct hydraulic hose for Caterpillar CAT®318F L Boom Assembly

Start with the machine and route

For Caterpillar CAT®318F L Boom Assembly, 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 Caterpillar CAT®318F L 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

392-4730820 mm · DN25；6SH-16；42Mpa · Arm cylinder — right
187-59541,150 mm · DN19；6SH-12；42Mpa · 大臂左3
269-95891,190 mm · DN25；6SH-16；42Mpa · 大臂左1

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 Caterpillar CAT®318F L Boom Assembly?

There are 9 published records. 9 include a length, both end fittings, and a part number or diagram pipe number.

What is the hose length range for Caterpillar CAT®318F L Boom Assembly?

Based on published records with valid lengths, the range is 670–1,550 mm. Open the individual record to verify its installation position and both end fittings before fabrication.

Which hose specifications are common for Caterpillar CAT®318F L Boom Assembly?

The most frequent raw specifications in the current published records are: DN25；6SH-16；42Mpa (4 records), DN19；6SH-12；42Mpa (3 records), DN16；6SH-10；42Mpa (1 records), DN25；1SN-16；7Mpa (1 records). Verify the specification together with length, pressure, and fitting details.

How can I identify the left and right hose fittings for Caterpillar CAT®318F L Boom Assembly?

Each record keeps the left and right fitting descriptions separate. Current examples: 392-4730: left Heavy-series flange; right 90° heavy-series flange; 187-5954: left American female thread, flat-face seal; right American female thread, flat-face seal; 269-9589: left Heavy-series flange; right 45°美制内螺纹平面密封. Open the exact part-number or pipe-number record; do not swap ends based on appearance alone.

Can I locate a Caterpillar CAT®318F L Boom Assembly hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 12 (392-4730), Pipe No. 1 (187-5954), Pipe No. 3 (269-9589), Pipe No. 1 (5I-4494). Open a record to compare its installation position with the linked manual page.