Length: 900 mm
Specification: DN19;4SP-12;35Mpa
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. 33

103-1428

Installation route: 液压泵下~分配阀前

Length: 1,800 mm
Specification: DN6;-4;19.2Mpa
Left fitting: 90°美制内螺纹37°锥
Right fitting: 美制内螺纹37°锥

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Diagram Pipe No. 22

122-5557

Installation route: 液压泵~液压油过滤器

Length: 500 mm
Specification: DN10;-6;10.3Mpa
Left fitting: 45°美制内螺纹37°锥
Right fitting: 美制内螺纹37°锥

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Diagram Pipe No. 76

4I-6352

Installation route: 液压泵~

Length: 900 mm
Specification: DN10;-6;10.3Mpa
Left fitting: 90°美制内螺纹37°锥
Right fitting: 美制内螺纹37°锥

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Diagram Pipe No. 17

7I-1335

Installation route: 液压泵~分配阀后

Length: 915 mm
Specification: DN19;4SP-12;35Mpa
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

7I-1330

Installation route: 液压泵前~分配阀后

Length: 945 mm
Specification: DN19;4SP-12;35Mpa
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. 1

113-6576

Installation route: 液压泵前~分配阀后

Length: 945 mm
Specification: DN19;4SP-12;35Mpa
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. 68

7I-0909

Installation route: 液压泵~液压泵吸油铁管

Length: 430 mm
Specification: DN13;-8;10.3Mpa
Left fitting: 90°美制内螺纹37°锥
Right fitting: 美制内螺纹37°锥

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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 Hydraulic Pump?

There are 6 published records. 6 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 Hydraulic Pump?

Based on published records with valid lengths, the range is 450–3,200 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 Hydraulic Pump?

The most frequent raw specifications in the current published records are: DN13;-8;10.3Mpa (3 records), DN10;-6;10.3Mpa (1 records), DN6;-4;10.3Mpa (1 records), DN6;-4;19.2Mpa (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 Hydraulic Pump?

Each record keeps the left and right fitting descriptions separate. Current examples: 7I-0900: left 美制内螺纹37°锥; right 美制内螺纹37°锥; 7I-0900: left 美制内螺纹37°锥; right 美制内螺纹37°锥; 7I-0924: 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 Hydraulic Pump hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 27 (7I-0900), Pipe No. 27 (7I-0900), Pipe No. 38 (7I-0924), Pipe No. 69 (7I-0903). Open a record to compare its installation position with the linked manual page.