Hydraulic line repair data

Caterpillar CAT®312B L Attachments – Quick Coupler Hose List

Coverage details

Hoses: 7 records
Full specifications: 7 records
Systems: 1 systems
Length range: 1,000–2,815 mm

Current system

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Hose repair details

Hose Length and Fitting List

Diagram Pipe No. 1

6Y-3290

Installation route: 快速联轴阀~分配阀左

Length: 1,800 mm
Specification: DN10;4SP-6;28Mpa
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. 11

239-5715

Installation route: 大臂后段(快换)~大臂前段(快换)

Length: 1,280 mm
Specification: DN6;2SN-4;40Mpa
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. 17

9U-3430

Installation route: 快速联轴阀~回转马达

Length: 1,000 mm
Specification: DN10;4SP-6;28Mpa
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. 10

239-5714

Installation route: 大臂后段快换管

Length: 1,960 mm
Specification: DN6;2SN-4;40Mpa
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. 16

9C-8614

Installation route: 快速联轴阀~液压泵

Length: 2,035 mm
Specification: DN10;4SP-6;28Mpa
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. 10

4I-3981

Installation route: 快速联轴阀~蓄能器电磁阀(液压油箱后)

Length: 2,750 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: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封

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Diagram Pipe No. 30

121-1344

Installation route: 快速联轴阀~液压泵上

Length: 2,815 mm
Specification: DN10;4SP-6;28Mpa
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. 17

145-4184

Installation route: 过渡接头(小臂侧)(快换)~过渡接头(小臂上)

Length: 1,020 mm
Specification: DN6;2SN-4;40Mpa
Left fitting: 90°美制内螺纹37°锥
Right fitting: 45°美制内螺纹平面密封

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Diagram Pipe No. 9

145-4185

Installation route: 过渡接头(小臂侧)(快换)~过渡接头(小臂上)

Length: 1,020 mm
Specification: DN6;2SN-4;40Mpa
Left fitting: 90°美制内螺纹37°锥
Right fitting: 45°美制内螺纹平面密封

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Diagram Pipe No. 10

145-4186

Installation route: 快换装置~过渡接头(小臂上)

Length: 1,930 mm
Specification: DN6;2SN-4;40Mpa
Left fitting: 90°美制内螺纹37°锥
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. 15

8W-2948

Installation route: 大臂(快换)~快速联轴阀

Length: 1,550 mm
Specification: DN10;4SP-6;28Mpa
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

216-4648

Installation route: 快换装置管路

Length: 715 mm
Specification: DN6;2SN-4;40Mpa
Left fitting: 45°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. 3

8W-2948

Installation route: 快速联轴阀~分配阀前

Length: 1,550 mm
Specification: DN10;4SP-6;28Mpa
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. 17

139-5997

Installation route: 过渡接头(小臂侧)(快换)~过渡接头(小臂上)

Length: 1,400 mm
Specification: DN6;2SN-4;40Mpa
Left fitting: 45°美制内螺纹平面密封
Right fitting: 90°美制内螺纹37°锥

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Diagram Pipe No. 5

216-4645

Installation route: 快换装置管路

Length: 715 mm
Specification: DN6;2SN-4;40Mpa
Left fitting: 45°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. 9

139-6004

Installation route: 过渡接头(小臂侧)(快换)~过渡接头(小臂上)

Length: 1,400 mm
Specification: DN6;2SN-4;40Mpa
Left fitting: 90°美制内螺纹37°锥
Right fitting: 45°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®312B L Attachments – Quick Coupler?

There are 7 published records. 7 include a length, both end fittings, and a part number or diagram pipe number.

What is the hose length range for Caterpillar CAT®312B L Attachments – Quick Coupler?

Based on published records with valid lengths, the range is 1,000–2,815 mm. Open the individual record to verify its installation position and both end fittings before fabrication.

Which hose specifications are common for Caterpillar CAT®312B L Attachments – Quick Coupler?

The most frequent raw specifications in the current published records are: DN10;4SP-6;28Mpa (4 records), DN6;2SN-4;40Mpa (2 records), DN10;1SN-6;10.4Mpa (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®312B L Attachments – Quick Coupler?

Each record keeps the left and right fitting descriptions separate. Current examples: 6Y-3290: left American female thread, flat-face seal; right American female thread, flat-face seal; 239-5715: left American female thread, flat-face seal; right American female thread, flat-face seal; 9U-3430: 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®312B L Attachments – Quick Coupler hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 1 (6Y-3290), Pipe No. 11 (239-5715), Pipe No. 17 (9U-3430), Pipe No. 10 (239-5714). Open a record to compare its installation position with the linked manual page.