Hydraulic line repair data

Caterpillar CAT®318B N Hose Repair Data

Coverage details

Hoses: 56 records
Full specifications: 56 records
Systems: 10 systems
Length range: 370–3,550 mm

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Control ValveControl LeverAttachments – BreakerBoom AssemblyAttachmentsHydraulic PumpSolenoid ValveAttachments – Lock ValveGrease LinesEngine Oil Lines

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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. 15

4I-1077

Installation route: 液压泵~堵头(减震管)

Length: 1,150 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: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封

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Diagram Pipe No. 18

7I-7117

Installation route: 中转接头~分配阀上

Length: 3,250 mm
Specification: DN10;-6;10.3Mpa
Left fitting: 美制内螺纹37°锥
Right fitting: 美制内螺纹37°锥

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Diagram Pipe No. 1

153-8640

Installation route: 小臂破碎器截止阀左

Length: 1,825 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: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封

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Diagram Pipe No. 28

4I-6245

Installation route: 中转接头~分配阀下

Length: 2,400 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. 6

7Y-8001

Installation route: 大臂(破碎器)~左过渡阀块(破碎器)

Length: 1,400 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

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Diagram Pipe No. 16

153-8636

Installation route: 小臂破碎器截止阀右

Length: 1,850 mm
Specification: DN25;6SH-16;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

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Diagram Pipe No. 14

142-1040

Installation route: 分配阀后~液压油散热器上

Length: 1,388 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: 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-5556

Installation route: 小臂破碎器截止阀左

Length: 1,550 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

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Diagram Pipe No. 16

7I-7117

Installation route: 踏板~分配阀上

Length: 3,250 mm
Specification: DN10;-6;10.3Mpa
Left fitting: 美制内螺纹37°锥
Right fitting: 美制内螺纹37°锥

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Diagram Pipe No. 13

4I-7608

Installation route: 分配阀下~蓄能器电磁阀

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. 16

127-6859

Installation route: 小臂破碎器截止阀左

Length: 1,550 mm
Specification: DN25;6SH-16;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

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Diagram Pipe No. 30

4I-7608

Installation route: 中转接头~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. 1

7I-7117

Installation route: 蓄能器电磁阀~进回油阀

Length: 3,250 mm
Specification: DN10;-6;10.3Mpa
Left fitting: 美制内螺纹37°锥
Right fitting: 美制内螺纹37°锥

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Diagram Pipe No. 9

4I-1455

Installation route: 分配阀上~过渡阀块(回转接头右)

Length: 2,330 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

7Y-8001

Installation route: 小臂破碎器截止阀右

Length: 1,400 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

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Diagram Pipe No. 7

108-7139

Installation route: 分配阀上~控制阀(回转马达右)

Length: 1,030 mm
Specification: DN6;-4;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. 31

119-2763

Installation route: 大臂左2

Length: 1,210 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

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Diagram Pipe No. 7

4I-8897

Installation route: 分配阀~回转马达(回油)

Length: 883 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

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Diagram Pipe No. 13

142-1107

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

Length: 3,550 mm
Specification: DN10;-6;10.3Mpa
Left fitting: 美制内螺纹37°锥
Right fitting: 美制内螺纹37°锥

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Diagram Pipe No. 5

5I-7461

Installation route: 大臂(破碎器)~右过渡阀块(破碎器)

Length: 1,400 mm
Specification: DN25;6SH-16;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

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Diagram Pipe No. 8

123-5349

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

Length: 2,400 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

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Diagram Pipe No. 1

121-6317

Installation route: 大臂油缸

Length: 680 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

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Diagram Pipe No. 64

7I-0918

Installation route: 分配阀~蓄能器电磁阀

Length: 2,000 mm
Specification: DN6;-4;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. 35

107-1594

Installation route: 分配阀前~蓄能器电磁阀

Length: 2,150 mm
Specification: DN6;-4;10.3Mpa
Left fitting: 美制内螺纹37°锥
Right fitting: 美制内螺纹37°锥

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Diagram Pipe No. 3

7Y-5691

Installation route: 小臂破碎器截止阀右

Length: 1,600 mm
Specification: DN25;6SH-16;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

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Diagram Pipe No. 15

5I-3142

Installation route: 分配阀下~手动阀手动阀(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

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Diagram Pipe No. 13

108-7159

Installation route: Intermediate adapter → control valveOriginal Chinese: 中转接头~分配阀

Length: 1,450 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. 15

151-1747

Installation route: Arm cylinder — rightOriginal Chinese: 小臂油缸右

Length: 930 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

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Diagram Pipe No. 54

108-7285

Installation route: 分配阀前~分配阀前

Length: 440 mm
Specification: DN6;-4;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. 17

4I-6233

Installation route: 中转接头~分配阀上

Length: 2,650 mm
Specification: DN10;-6;10.3Mpa
Left fitting: 美制内螺纹37°锥
Right fitting: 美制内螺纹37°锥

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Diagram Pipe No. 19

135-1097

Installation route: 液压泵上~蓄能器电磁阀

Length: 850 mm
Specification: DN6;-4;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. 6

102-8280

Installation route: 过渡接头(大臂油缸锁止阀)~分配阀

Length: 1,560 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. 34

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

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Diagram Pipe No. 7

108-7139

Installation route: 分配阀前~先导阀

Length: 1,030 mm
Specification: DN6;-4;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

135-5733

Installation route: 机油管

Length: 1,180 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

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Diagram Pipe No. 41

4I-6245

Installation route: 分配阀上~

Length: 2,400 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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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®318B N?

The current published data covers 10 systems and 56 hose records. Systems with more listed records include: Control Valve (13 hoses), Control Lever (8 hoses), Attachments – Breaker (8 hoses), Boom Assembly (7 hoses), Attachments (6 hoses), Hydraulic Pump (3 hoses).

What is the hose length range for Caterpillar CAT®318B N?

Based on published records with valid lengths, the range is 370–3,550 mm. Open the individual record to verify its installation position and both end fittings before fabrication.

Which hose specifications are common for Caterpillar CAT®318B N?

The most frequent raw specifications in the current published records are: DN10;-6;10.3Mpa (25 records), DN6;-4;10.3Mpa (8 records), DN19;6SH-12;42Mpa (5 records), DN25;6SH-16;42Mpa (5 records), DN19;4SP-12;35Mpa (4 records). Verify the specification together with length, pressure, and fitting details.

How can I identify the left and right hose fittings for Caterpillar CAT®318B N?

Each record keeps the left and right fitting descriptions separate. Current examples: 4I-1077: left American female thread, flat-face seal; right American female thread, flat-face seal; 7I-7117: left 美制内螺纹37°锥; right 美制内螺纹37°锥; 153-8640: 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®318B N hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 15 (4I-1077), Pipe No. 18 (7I-7117), Pipe No. 1 (153-8640), Pipe No. 28 (4I-6245). 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 CAT®318B N 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-174-318b-n--43415426233137343b33313842204e/

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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