Hydraulic line repair data

Caterpillar CAT®312D Hydraulic Pump Hose List

Coverage details

Hoses: 14 records
Full specifications: 14 records
Systems: 1 systems
Length range: 460–2,100 mm

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Hose repair details

Hose Length and Fitting List

Diagram Pipe No. 50

286-6769

Installation route: 液压泵~分配阀右上

Length: 2,100 mm
Specification: DN10;6SH-6;42Mpa
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

7I-1288

Installation route: 液压泵~分配阀(进油)

Length: 900 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° 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. 10

314-8236

Installation route: 液压泵~电磁阀(液压泵后下)

Length: 460 mm
Specification: DN13;1SN-8;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. 3

391-6116

Installation route: 液压泵~分配阀(进油)

Length: 1,070 mm
Specification: DN19;6SH-12;42Mpa
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

319-9775

Installation route: 先导泵~吸油铁管

Length: 540 mm
Specification: DN25;1SN-16;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. 18

269-9703

Installation route: 液压泵~电磁阀(液压泵后下)

Length: 690 mm
Specification: DN10;6SH-6;42Mpa
Left fitting: American female thread, flat-face sealOriginal Chinese: 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

292-7176

Installation route: 液压泵~液压油箱

Length: 960 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. 9

320-0008

Installation route: 液压泵~液压油过滤器

Length: 1,200 mm
Specification: DN13;1SN-8;10.4Mpa
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. 8

387-3666

Installation route: 先导泵~控制阀(回转接头右)

Length: 1,670 mm
Specification: DN16;4SP-10;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. 10

314-8236

Installation route: 先导泵~液压油过滤器

Length: 460 mm
Specification: DN13;1SN-8;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. 2

131-9869

Installation route: 先导泵~吸油铁管

Length: 482 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: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封

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Diagram Pipe No. 5

178-5955

Installation route: 液压泵~液压油过滤器

Length: 610 mm
Specification: DN19;1SN-12;8.7Mpa
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. 52

292-7446

Installation route: 液压泵~分配阀右上

Length: 1,180 mm
Specification: DN10;6SH-6;42Mpa
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

260-7900

Installation route: 液压泵~电磁阀(液压泵后下)

Length: 510 mm
Specification: DN10;6SH-6;42Mpa
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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Workshop guide

Finding the correct hydraulic hose for Caterpillar CAT®312D Hydraulic Pump

Start with the machine and route

For Caterpillar CAT®312D Hydraulic Pump, 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®312D 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

286-67692,100 mm · DN10;6SH-6;42Mpa · 液压泵~分配阀右上
7I-1288900 mm · DN19;6SH-12;42Mpa · 液压泵~分配阀(进油)
314-8236460 mm · DN13;1SN-8;10.4Mpa · 液压泵~电磁阀(液压泵后下)

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®312D Hydraulic Pump?

There are 14 published records. 14 include a length, both end fittings, and a part number or diagram pipe number.

What is the hose length range for Caterpillar CAT®312D Hydraulic Pump?

Based on published records with valid lengths, the range is 460–2,100 mm. Open the individual record to verify its installation position and both end fittings before fabrication.

Which hose specifications are common for Caterpillar CAT®312D Hydraulic Pump?

The most frequent raw specifications in the current published records are: DN10;6SH-6;42Mpa (4 records), DN13;1SN-8;10.4Mpa (3 records), DN19;1SN-12;8.7Mpa (2 records), DN19;6SH-12;42Mpa (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®312D Hydraulic Pump?

Each record keeps the left and right fitting descriptions separate. Current examples: 286-6769: left American female thread, flat-face seal; right 90° elbow, American female thread, flat-face seal; 7I-1288: left American female thread, flat-face seal; right 90° elbow, American female thread, flat-face seal; 314-8236: left American female thread, flat-face seal; right 90° elbow, 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®312D Hydraulic Pump hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 50 (286-6769), Pipe No. 1 (7I-1288), Pipe No. 10 (314-8236), Pipe No. 3 (391-6116). Open a record to compare its installation position with the linked manual page.