Hydraulic line repair data

Caterpillar Hydraulic Hose Directory

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Coverage details
Hoses
3,627 records
Full specifications
3,627 records
Systems
17 systems
Length range
140–10,396 mm

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CAT®314E LCRBrowse hose recordsCAT®315F LCRBrowse hose recordsCAT®318CBrowse hose recordsCAT®317B LNBrowse hose recordsCAT®314D LCRBrowse hose recordsCAT®312-ABrowse hose recordsCAT®317B LBrowse hose recordsCAT®312D LBrowse hose recordsCAT®312B LBrowse hose recordsCAT®315CBrowse hose recordsCAT®316F LBrowse hose recordsCAT®312C LBrowse hose recordsCAT®314F CRBrowse hose recordsCAT®317-ABrowse hose recordsCAT®312CBrowse hose recordsCAT®316FBrowse hose recordsCAT®318E LBrowse hose recordsCAT®312E LBrowse hose records

25 published models

Handwritten technical data

Browse workshop notebook material for Caterpillar models. Confirm each hose, fitting, route, and manufacturing dimension on the machine.

Hose repair details

Hose Length and Fitting List

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

Diagram Pipe No. 3

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
View full repair specifications

Diagram Pipe No. 36

5C-2584

Installation route: 分配阀~液压油箱

Length
975 mm
Specification
DN38;4SP-24;17.5Mpa
Left fitting
Light-series flangeOriginal Chinese: 法兰-轻型
Right fitting
Light-series flangeOriginal Chinese: 法兰-轻型
View full repair specifications

Diagram Pipe No. 12

104-8771

Installation route: 中转接头~分配阀上

Length
2,430 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
View full repair specifications

Diagram Pipe No. 5

4I-3994

Installation route: 中转接头~分配阀上

Length
2,300 mm
Specification
DN10;-6;10.3Mpa
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

252-3030

Installation route: Right boom-cylinder grease lineOriginal Chinese: 右大臂油缸黄油管

Length
2,250 mm
Specification
DN6;-4;10.3Mpa
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. 11

391-5275

Installation route: 回转接头~电磁阀(回转接头右)

Length
610 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
View full repair specifications

Diagram Pipe No. 10

4I-6248

Installation route: 回转马达~

Length
940 mm
Specification
DN10;-6;10.3Mpa
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

237-3227

Installation route: 大臂(附加装置)~小臂(附加装置)

Length
1,350 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
American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封
View full repair specifications

Diagram Pipe No. 18

108-7360

Installation route: 中转接头~分配阀上左

Length
2,050 mm
Specification
DN10;-6;10.3Mpa
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

320-0063

Installation route: 液压油箱~铁管(大臂)

Length
2,100 mm
Specification
DN10;-6;10.3Mpa
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

4I-1031

Installation route: 分配阀上~电磁阀(分配阀左前)

Length
500 mm
Specification
DN10;-6;10.3Mpa
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

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. 20

179-7770

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

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

Diagram Pipe No. 7

376-6265

Installation route: 右大臂油缸锁止阀~分配阀

Length
3,060 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
View full repair specifications

Diagram Pipe No. 7

172-5926

Installation route: 右小臂手动阀~

Length
1,050 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
Heavy-series flangeOriginal Chinese: 法兰-重型
View full repair specifications

Diagram Pipe No. 25

5W-8100

Installation route: 右支腿油缸~手动阀(连接回转接头)

Length
397 mm
Specification
DN10;2SN-6;33Mpa
Left fitting
公制内螺纹24°锥带O形圈-重型
Right fitting
公制内螺纹24°锥带O形圈-重型
View full repair specifications

Diagram Pipe No. 13

194-4303

Installation route: 大臂前段(快换)~大臂后段(快换)

Length
1,435 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
View full repair specifications

Diagram Pipe No. 10

8U-3100

Installation route: 回转接头~前传动轴

Length
1,295 mm
Specification
DN10;2SN-6;33Mpa
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. 8

8U-1071

Installation route: 大臂油缸

Length
700 mm
Specification
DN19;4SP-12;35Mpa
Left fitting
Heavy-series flangeOriginal Chinese: 法兰-重型
Right fitting
Heavy-series flangeOriginal Chinese: 法兰-重型
View full repair specifications

Diagram Pipe No. 16

8U-3097

Installation route: 后桥~过渡接头(回转接头旁)

Length
901 mm
Specification
DN10;2SN-6;33Mpa
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

4I-5648

Installation route: 大臂左1

Length
1,150 mm
Specification
DN25;4SP-16;35Mpa
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

121-8659

Installation route: Right boom-cylinder grease lineOriginal Chinese: 右大臂油缸黄油管

Length
2,000 mm
Specification
DN6;-4;10.3Mpa
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. 1

113-6738

Installation route: 小臂油缸锁止阀

Length
3,100 mm
Specification
DN10;-6;10.3Mpa
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. 1

4I-6136

Installation route: 分节油缸锁止阀

Length
1,500 mm
Specification
DN10;-6;10.3Mpa
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

135-5732

Installation route: 机油管

Length
1,120 mm
Specification
DN16;1SN-10;2.4Mpa
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
View full repair specifications

Diagram Pipe No. 41

108-7143

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

Length
1,120 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

109-7556

Installation route: 减压阀(驾驶室)~模式转换阀(驾驶室)

Length
450 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
View full repair specifications

Diagram Pipe No. 15

5I-3142

Installation route: 分配阀下~手动阀(分配阀前)

Length
1,300 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. 5

373-9966

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

Length
2,320 mm
Specification
DN10;-6;10.3Mpa
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. 24

9D-5861

Installation route: 分配阀~过渡阀块

Length
1,077 mm
Specification
DN10;4SP-6;28Mpa
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-1410

Installation route: 中转接头~分配阀下

Length
1,590 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. 17

285-2719

Installation route: 电磁阀(分配阀后)~

Length
2,850 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
View full repair specifications

Diagram Pipe No. 3

101-2170

Installation route: 左小臂销黄油管

Length
730 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. 1

104-9091

Installation route: 进回油阀~后中转接头

Length
1,650 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. 2

7Y-4193

Installation route: 电磁阀(液压泵左后)~电磁阀(分配阀右前)

Length
2,500 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
View full repair specifications

Manual coverage

Machines with PDF Manuals

Use these manuals to identify the machine and system. Hose-level specifications appear on individual hose records.

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?

The current published data covers 17 systems and 3627 hose records. Systems with more listed records include: CAT®314E LCR · Attachments (30 hoses), CAT®315F LCR · Attachments (30 hoses), CAT®318C · Control Valve (23 hoses), CAT®312-A · Control Valve (22 hoses), CAT®312C L · Attachments (21 hoses), CAT®312B L · Attachments (18 hoses).

What is the hose length range for Caterpillar?

Based on published records with valid lengths, the range is 140–10,396 mm. Open the individual record to verify its installation position and both end fittings before fabrication.

Which hose specifications are common for Caterpillar?

The most frequent raw specifications in the current published records are: DN10;-6;10.3Mpa (622 records), DN10;1SN-6;10.4Mpa (451 records), DN6;-4;10.3Mpa (311 records), DN19;6SH-12;42Mpa (229 records), DN10;1SN-6;15.7Mpa (165 records). Verify the specification together with length, pressure, and fitting details.

How can I identify the left and right hose fittings for Caterpillar?

Each record keeps the left and right fitting descriptions separate. Current examples: 178-5955: left American female thread, flat-face seal; right 90° elbow, American female thread, flat-face seal; 5C-2584: left Light-series flange; right Light-series flange; 104-8771: 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 hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 3 (178-5955), Pipe No. 36 (5C-2584), Pipe No. 12 (104-8771), Pipe No. 5 (4I-3994). Open a record to compare its installation position with the linked manual page.

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I am checking hydraulic hose repair information for "Caterpillar Hydraulic Hose Directory". 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/brands/caterpillar/

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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