Hydraulic line repair data

Caterpillar CAT®312-A Hose Repair Data

Coverage details
Hoses
75 records
Full specifications
75 records
Systems
11 systems
Length range
400–3,200 mm

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Hose repair details

Hose Length and Fitting List

Showing 36 representative records. Return to the finder for a more specific search.

Diagram Pipe No. 23

4I-1413

Installation route: 中转接头~分配阀下

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
View full repair specifications

Diagram Pipe No. 11

4I-3778

Installation route: 分配阀上~先导阀(分配阀左前)

Length
820 mm
Specification
DN10;-6;10.3Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

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
View full repair specifications

Diagram Pipe No. 27

7I-0900

Installation route: 液压泵上~液压油箱

Length
450 mm
Specification
DN13;-8;10.3Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

Diagram Pipe No. 7

141-6246

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

Length
620 mm
Specification
DN10;1SN-6;15.7Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

Diagram Pipe No. 1

137-6450

Installation route: 小臂油缸锁止阀~分配阀前

Length
1,800 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
American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封
View full repair specifications

Diagram Pipe No. 3

7I-0930

Installation route: 分配阀前~回转马达

Length
1,150 mm
Specification
DN6;-4;10.3Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

Diagram Pipe No. 8

141-6245

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

Length
765 mm
Specification
DN10;1SN-6;15.7Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

Diagram Pipe No. 8

4I-3778

Installation route: 分配阀上~分配阀下

Length
820 mm
Specification
DN10;-6;10.3Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

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
View full repair specifications

Diagram Pipe No. 11

7I-1371

Installation route: 大臂左3

Length
910 mm
Specification
DN16;4SP-10;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
View full repair specifications

Diagram Pipe No. 4

7T-6625

Installation route: 过渡接头(大臂油缸锁止阀)~分配阀下

Length
2,200 mm
Specification
DN10;1SN-6;15.7Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

Diagram Pipe No. 28

122-5358

Installation route: 大臂左2

Length
910 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
View full repair specifications

Diagram Pipe No. 53

103-1348

Installation route: 分配阀下~

Length
1,470 mm
Specification
DN6;-4;19.2Mpa
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
View full repair specifications

Diagram Pipe No. 27

7I-0900

Installation route: 液压泵上~回油铁管

Length
450 mm
Specification
DN13;-8;10.3Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

Diagram Pipe No. 56

7I-0184

Installation route: 分配阀下~分配阀下

Length
550 mm
Specification
DN10;-6;10.3Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

Diagram Pipe No. 38

7I-0924

Installation route: 液压泵上~蓄能器电磁阀(液压油箱后)

Length
500 mm
Specification
DN6;-4;10.3Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

Diagram Pipe No. 6

5I-4487

Installation route: 蓄能器电磁阀(液压油箱后)~先导阀(分配阀左前)

Length
1,350 mm
Specification
DN10;-6;10.3Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

Diagram Pipe No. 33

123-2636

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

Length
760 mm
Specification
DN16;6SH-10;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
View full repair specifications

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
View full repair specifications

Diagram Pipe No. 29

7I-0181

Installation route: 分配阀上~分配阀下

Length
1,250 mm
Specification
DN10;-6;10.3Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

Diagram Pipe No. 53

103-1348

Installation route: 分配阀下~蓄能器电磁阀(液压油箱后)

Length
1,470 mm
Specification
DN6;-4;19.2Mpa
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
View full repair specifications

Diagram Pipe No. 91

111-6505

Installation route: 回转马达~手动阀(液压油箱后)

Length
2,300 mm
Specification
DN6;-4;10.3Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

Diagram Pipe No. 10

4I-6349

Installation route: 分配阀上~阀块(分配阀前)

Length
1,000 mm
Specification
DN10;-6;10.3Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

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
View full repair specifications

Diagram Pipe No. 29

7I-0181

Installation route: 分配阀上~分配阀上

Length
1,250 mm
Specification
DN10;-6;10.3Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

Diagram Pipe No. 30

7I-0175

Installation route: Swivel joint → travel motorOriginal Chinese: 回转接头~行走马达

Length
1,800 mm
Specification
DN10;-6;10.3Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

Diagram Pipe No. 7

7I-0924

Installation route: 分配阀下~分配阀前

Length
500 mm
Specification
DN6;-4;10.3Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

Diagram Pipe No. 62

103-1434

Installation route: 分配阀上~分配阀上

Length
1,200 mm
Specification
DN10;-6;10.3Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

Diagram Pipe No. 3

7I-1361

Installation route: 大臂油缸

Length
730 mm
Specification
DN16;4SP-10;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
View full repair specifications

Diagram Pipe No. 3

087-5857

Installation route: Arm-cylinder grease lineOriginal Chinese: 小臂油缸黄油管

Length
2,650 mm
Specification
DN6;-4;19.2Mpa
Left fitting
美制锥形外螺纹30°内锥
Right fitting
美制锥形外螺纹
View full repair specifications

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
View full repair specifications

Diagram Pipe No. 1

124-0868

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

Length
722 mm
Specification
DN16;1SN-10;10.5Mpa
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
View full repair specifications

Diagram Pipe No. 4

137-6451

Installation route: 分配阀前~回转马达

Length
2,100 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
View full repair specifications

Diagram Pipe No. 5

7I-0085

Installation route: 小臂油缸

Length
770 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
View full repair specifications

Diagram Pipe No. 62

103-1434

Installation route: 分配阀上~蓄能器电磁阀(液压油箱后)

Length
1,200 mm
Specification
DN10;-6;10.3Mpa
Left fitting
美制内螺纹37°锥
Right fitting
美制内螺纹37°锥
View full repair specifications

Based on current published data

Common Repair Questions

Questions appear only when a published record or linked PDF page provides the answer.

Which systems and hoses are currently listed for Caterpillar CAT®312-A?

The current published data covers 11 systems and 75 hose records. Systems with more listed records include: Control Valve (22 hoses), Attachments – Lock Valve (12 hoses), Attachments (11 hoses), Boom Assembly (6 hoses), Hydraulic Pump (6 hoses), Swivel Joint (5 hoses).

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

Based on published records with valid lengths, the range is 400–3,200 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?

The most frequent raw specifications in the current published records are: DN10;-6;10.3Mpa (26 records), DN6;-4;10.3Mpa (11 records), DN19;4SP-12;28Mpa (10 records), DN10;1SN-6;15.7Mpa (7 records), DN6;-4;19.2Mpa (6 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?

Each record keeps the left and right fitting descriptions separate. Current examples: 4I-1413: left 美制内螺纹37°锥; right 美制内螺纹37°锥; 4I-3778: left 美制内螺纹37°锥; right 美制内螺纹37°锥; 7I-7383: 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®312-A hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 23 (4I-1413), Pipe No. 11 (4I-3778), Pipe No. 24 (7I-7383), Pipe No. 27 (7I-0900). Open a record to compare its installation position with the linked manual page.

Optional cross-check

Ask an AI search tool to check this repair data

The question is already written for this machine or hose. Use a tool with web search enabled; treat its answer as a starting point and verify on the machine.

See the exact question being sent
I am checking hydraulic hose repair information for "Caterpillar CAT®312-A Hose Repair Data". Use web search and cite a source for every factual point. Compare this HoseSeek page with manufacturer manuals and reliable parts documentation: https://www.hoseseek.com/machines/caterpillar/cat-174-312-a--43415426233137343b3331322d41/

Verify, where applicable:
1. Exact machine model and any serial-number range.
2. Hydraulic system and installation route.
3. Hose part number and diagram pipe number.
4. Finished length, hose specification, and pressure rating.
5. Both end fittings, including thread, sealing seat, size, and angle.
6. Installation-diagram position and routing.

State explicitly what you could not verify. Do not infer a missing dimension or fitting. End with a short on-machine checklist for a hose repair technician.
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