Hydraulic line repair data

Caterpillar CAT®312-A Attachments Hose List

Coverage details

Hoses: 11 records
Full specifications: 11 records
Systems: 1 systems
Length range: 400–2,840 mm

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Hose repair details

Hose Length and Fitting List

Diagram Pipe No. 24

7I-7383

Installation route: 大臂~铁管(回转马达右)

Length: 970 mm
Specification: DN19;4SP-12;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. 9

7I-7383

Installation route: 大臂(附加装置)~过渡接头(回转马达右)

Length: 970 mm
Specification: DN19;4SP-12;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. 2

4I-1845

Installation route: 先导阀(分配阀左前)~手动阀(分配阀前)

Length: 400 mm
Specification: DN10;-6;10.3Mpa
Left fitting: 美制内螺纹37°锥
Right fitting: 美制内螺纹37°锥

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Diagram Pipe No. 3

7I-8385

Installation route: 大臂(附加装置)~小臂(附加装置)

Length: 1,150 mm
Specification: DN19;4SP-12;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. 4

4I-1413

Installation route: 踏板(附加装置)~手动阀(连分配阀)

Length: 2,530 mm
Specification: DN10;-6;10.3Mpa
Left fitting: 美制内螺纹37°锥
Right fitting: 美制内螺纹37°锥

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Diagram Pipe No. 4

4I-7608

Installation route: 踏板(附加装置)~分配阀下

Length: 2,050 mm
Specification: DN10;-6;10.3Mpa
Left fitting: 美制内螺纹37°锥
Right fitting: 美制内螺纹37°锥

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Diagram Pipe No. 4

129-6498

Installation route: 手动阀(大臂上)~大臂铁管

Length: 1,045 mm
Specification: DN25;4SP-16;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. 1

7I-7383

Installation route: 大臂(附加装置)~分配阀前

Length: 970 mm
Specification: DN19;4SP-12;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. 6

7I-8316

Installation route: 大臂(附加装置)~小臂(附加装置)

Length: 1,300 mm
Specification: DN19;4SP-12;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. 6

7I-8323

Installation route: 大臂(附加装置)~小臂(附加装置)

Length: 1,850 mm
Specification: DN19;4SP-12;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

4I-1452

Installation route: 踏板(附加装置)~分配阀

Length: 2,840 mm
Specification: DN10;-6;10.3Mpa
Left fitting: 美制内螺纹37°锥
Right fitting: 美制内螺纹37°锥

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Diagram Pipe No. 1

133-3665

Installation route: 大臂(附加装置)~小臂(附加装置)

Length: 1,655 mm
Specification: DN19;4SP-12;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. 18

151-8793

Installation route: 风扇电机~液压泵吸油铁管

Length: 1,110 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: 45°美制内螺纹平面密封

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Diagram Pipe No. 53

7I-7431

Installation route: 手动阀(回转马达上)~铁管(回转马达右)

Length: 450 mm
Specification: DN19;4SP-12;28Mpa
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

7I-8303

Installation route: 安全阀(大臂上)~大臂铁管

Length: 600 mm
Specification: DN19;4SP-12;28Mpa
Left fitting: 45°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. 5

129-1077

Installation route: 手动阀(大臂上)~大臂铁管

Length: 700 mm
Specification: DN19;4SP-12;28Mpa
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

102-1130

Installation route: 过渡接头(回转马达前)~过渡接头(回转接头前)

Length: 458 mm
Specification: DN16;1SN-10;10.5Mpa
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. 14

7I-7383

Installation route: 大臂(附加装置)~铁管(回转马达上)

Length: 970 mm
Specification: DN19;4SP-12;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. 2

133-3664

Installation route: 大臂(附加装置)~小臂(附加装置)

Length: 1,655 mm
Specification: DN25;4SP-16;28Mpa
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. 12

129-1077

Installation route: 安全阀(大臂上)~大臂铁管

Length: 700 mm
Specification: DN19;4SP-12;28Mpa
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. 12

7I-7435

Installation route: 铁管(回转马达上)~单向阀(分配阀左)

Length: 465 mm
Specification: DN19;1SN-12;8.7Mpa
Left fitting: 90° elbow, American female thread, flat-face sealOriginal Chinese: 90°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

135-2779

Installation route: 安全阀(大臂上)~大臂铁管

Length: 750 mm
Specification: DN19;4SP-12;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. 16

156-4953

Installation route: 风扇电机~控制阀(分配阀下)

Length: 1,900 mm
Specification: DN16;4SP-10;28Mpa
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

7I-8306

Installation route: 安全阀(大臂上)~大臂铁管

Length: 710 mm
Specification: DN19;4SP-12;28Mpa
Left fitting: 45°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. 20

7I-7435

Installation route: 单向阀(分配阀左)~手动阀(回转马达上)

Length: 465 mm
Specification: DN19;1SN-12;8.7Mpa
Left fitting: 90° elbow, American female thread, flat-face sealOriginal Chinese: 90°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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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®312-A Attachments?

There are 11 published records. 11 include a length, both end fittings, and a part number or diagram pipe number.

What is the hose length range for Caterpillar CAT®312-A Attachments?

Based on published records with valid lengths, the range is 400–2,840 mm. Open the individual record to verify its installation position and both end fittings before fabrication.

Which hose specifications are common for Caterpillar CAT®312-A Attachments?

The most frequent raw specifications in the current published records are: DN19;4SP-12;28Mpa (6 records), DN10;-6;10.3Mpa (4 records), DN25;4SP-16;28Mpa (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®312-A Attachments?

Each record keeps the left and right fitting descriptions separate. Current examples: 7I-7383: left American female thread, flat-face seal; right American female thread, flat-face seal; 7I-7383: left American female thread, flat-face seal; right American female thread, flat-face seal; 4I-1845: left 美制内螺纹37°锥; right 美制内螺纹37°锥. Open the exact part-number or pipe-number record; do not swap ends based on appearance alone.

Can I locate a Caterpillar CAT®312-A Attachments hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 24 (7I-7383), Pipe No. 9 (7I-7383), Pipe No. 2 (4I-1845), Pipe No. 3 (7I-8385). Open a record to compare its installation position with the linked manual page.