Hydraulic line repair data

Caterpillar CAT®312C Attachments – Lock Valve Hose List

Coverage details

Hoses: 4 records
Full specifications: 4 records
Systems: 1 systems
Length range: 502–4,180 mm

Current system

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Hose repair details

Hose Length and Fitting List

Diagram Pipe No. 12

243-4552

Installation route: 右大臂油缸锁止阀~过渡接头(大臂油缸锁止阀)

Length: 502 mm
Specification: DN13;6SH-8;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. 1

137-4677

Installation route: 小臂油缸锁止阀

Length: 3,200 mm
Specification: DN10;1SN-6;15.7Mpa
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. 3

199-1377

Installation route: 小臂油缸锁止阀

Length: 4,180 mm
Specification: DN10;1SN-6;15.7Mpa
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. 4

199-5957

Installation route: 小臂油缸锁止阀

Length: 2,110 mm
Specification: DN10;2SN-6;33Mpa
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. 13

4E-3449

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: 550 mm
Specification: DN10;1SN-6;15.7Mpa
Left fitting: 45°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. 1

202-7301

Installation route: 分节油缸锁止阀~分配阀上

Length: 3,320 mm
Specification: DN10;1SN-6;15.7Mpa
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. 4

087-4402

Installation route: 左大臂油缸锁止阀~过渡接头(大臂油缸锁止阀)

Length: 480 mm
Specification: DN10;1SN-6;10.4Mpa
Left fitting: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封
Right fitting: 90° elbow, American female thread, flat-face sealOriginal Chinese: 90°美制内螺纹平面密封

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Diagram Pipe No. 4

087-4402

Installation route: 右大臂油缸锁止阀~过渡接头(大臂油缸锁止阀)

Length: 480 mm
Specification: DN10;1SN-6;10.4Mpa
Left fitting: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封
Right fitting: 90° elbow, American female thread, flat-face sealOriginal Chinese: 90°美制内螺纹平面密封

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Diagram Pipe No. 6

087-5780

Installation route: 左大臂油缸锁止阀~过渡阀块(分配阀下)

Length: 2,550 mm
Specification: DN10;-6;10.3Mpa
Left fitting: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封
Right fitting: 90° elbow, American female thread, flat-face sealOriginal Chinese: 90°美制内螺纹平面密封

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Diagram Pipe No. 1

4E-3449

Installation route: 右大臂油缸锁止阀~过渡接头(大臂油缸锁止阀)

Length: 550 mm
Specification: DN10;1SN-6;15.7Mpa
Left fitting: 45°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. 6

7I-5421

Installation route: 过渡接头(小臂油缸锁止阀)~过渡接头(回转接头前)

Length: 810 mm
Specification: DN10;1SN-6;15.7Mpa
Left fitting: 45°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. 2

202-7302

Installation route: 分节油缸锁止阀~过渡阀块(分配阀下)

Length: 2,945 mm
Specification: DN10;1SN-6;15.7Mpa
Left fitting: 90° elbow, American female thread, flat-face sealOriginal Chinese: 90°美制内螺纹平面密封
Right fitting: 90° elbow, American female thread, flat-face sealOriginal Chinese: 90°美制内螺纹平面密封

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Diagram Pipe No. 4

087-5765

Installation route: 左大臂油缸锁止阀~过渡接头(大臂油缸锁止阀)

Length: 570 mm
Specification: DN10;-6;10.3Mpa
Left fitting: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封
Right fitting: 90° elbow, American female thread, flat-face sealOriginal Chinese: 90°美制内螺纹平面密封

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Diagram Pipe No. 1

227-8217

Installation route: 分节油缸锁止阀~过渡阀块(分配阀下)

Length: 2,635 mm
Specification: DN10;1SN-6;15.7Mpa
Left fitting: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封
Right fitting: 90° elbow, American female thread, flat-face sealOriginal Chinese: 90°美制内螺纹平面密封

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Diagram Pipe No. 1

227-8217

Installation route: 分节油缸锁止阀~分配阀上

Length: 2,635 mm
Specification: DN10;1SN-6;15.7Mpa
Left fitting: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封
Right fitting: 90° elbow, American female thread, flat-face sealOriginal Chinese: 90°美制内螺纹平面密封

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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®312C Attachments – Lock Valve?

There are 4 published records. 4 include a length, both end fittings, and a part number or diagram pipe number.

What is the hose length range for Caterpillar CAT®312C Attachments – Lock Valve?

Based on published records with valid lengths, the range is 502–4,180 mm. Open the individual record to verify its installation position and both end fittings before fabrication.

Which hose specifications are common for Caterpillar CAT®312C Attachments – Lock Valve?

The most frequent raw specifications in the current published records are: DN10;1SN-6;15.7Mpa (2 records), DN10;2SN-6;33Mpa (1 records), DN13;6SH-8;42Mpa (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®312C Attachments – Lock Valve?

Each record keeps the left and right fitting descriptions separate. Current examples: 243-4552: left American female thread, flat-face seal; right American female thread, flat-face seal; 137-4677: left American female thread, flat-face seal; right American female thread, flat-face seal; 199-1377: 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 Caterpillar CAT®312C Attachments – Lock Valve hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 12 (243-4552), Pipe No. 1 (137-4677), Pipe No. 3 (199-1377), Pipe No. 4 (199-5957). Open a record to compare its installation position with the linked manual page.