Hydraulic line repair data

Caterpillar CAT®312D L Hose Repair Data

Coverage details

Hoses: 74 records
Full specifications: 74 records
Systems: 14 systems
Length range: 300–6,260 mm

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Control ValveGrease LinesAttachmentsControl LeverSolenoid ValvePedalAttachments – BreakerHydraulic PumpBoom AssemblyAttachments – Lock ValveSupply and Return ValveAttachments – Quick Coupler

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

Diagram Pipe No. 2

108-9097

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

Length: 1,520 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. 8

302-9326

Installation route: 小臂破碎器截止阀左

Length: 1,180 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. 4

121-8662

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

Length: 2,650 mm
Specification: DN6;-4;10.3Mpa
Left fitting: 美制锥形外螺纹
Right fitting: 美制锥形外螺纹30°内锥

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Diagram Pipe No. 8

397-8253

Installation route: 控制阀(推土铲)~液压泵

Length: 1,610 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

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Diagram Pipe No. 6

290-9045

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

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

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Diagram Pipe No. 18

168-9331

Installation route: 电磁阀(液压油箱后上)~

Length: 1,100 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: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封

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Diagram Pipe No. 9

194-0325

Installation route: 行走踏板~中转接头(踏板)

Length: 340 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

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Diagram Pipe No. 19

168-9331

Installation route: 电磁阀(液压油箱后上)~液压油箱

Length: 1,100 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: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封

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Diagram Pipe No. 12

282-7150

Installation route: 分配阀后~

Length: 1,900 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: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封

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Diagram Pipe No. 2

277-0917

Installation route: 小臂破碎器截止阀左

Length: 1,900 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: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封

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Diagram Pipe No. 6

104-8774

Installation route: 中转接头(踏板)~分配阀上

Length: 2,200 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. 7

104-8976

Installation route: 中转接头(踏板)~分配阀上

Length: 1,900 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. 5

7Y-4366

Installation route: 分配阀下~电磁阀(分配阀下)

Length: 750 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. 5

179-7778

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

Length: 1,900 mm
Specification: DN13;-8;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

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Diagram Pipe No. 4

202-4010

Installation route: 控制阀(推土铲)~过渡阀块(分配阀下)

Length: 880 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

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Diagram Pipe No. 9

397-8257

Installation route: 液压泵~液压泵吸油铁管

Length: 560 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. 8

285-2447

Installation route: 控制阀(推土铲)~液压泵

Length: 1,840 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

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Diagram Pipe No. 18

292-7176

Installation route: 中转接头~电磁阀(驾驶室右)

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. 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. 6

443-8311

Installation route: 小臂快换装置管

Length: 5,980 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

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Diagram Pipe No. 7

203-7401

Installation route: Left boom-cylinder grease lineOriginal Chinese: 左大臂油缸黄油管

Length: 2,100 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. 9

344-6276

Installation route: 大臂(附加装置)~过渡接头(回转接头上)

Length: 6,260 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: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封

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Diagram Pipe No. 5

290-9044

Installation route: 黄油分配阀~过渡接头(小臂上)

Length: 1,550 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. 9

272-4142

Installation route: 电磁阀(分配阀下)~过渡阀块(液压泵下)

Length: 980 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. 2

124-0838

Installation route: 铲斗油缸左(规格3)

Length: 1,300 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. 13

5I-8708

Installation route: 分配阀左上~过渡阀块(分配阀下)

Length: 950 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. 3

101-2170

Installation route: 小臂销黄油管左

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

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Diagram Pipe No. 10

187-7173

Installation route: Boom cylinder — left 2 / left 3Original Chinese: 大臂油缸左2/左3

Length: 780 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. 16

329-2730

Installation route: 回转马达~蓄能器电磁阀(液压泵后下)

Length: 1,802 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. 6

123-2636

Installation route: 大臂油缸左1/左4

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

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Diagram Pipe No. 4

4I-5933

Installation route: 中转接头~分配阀下左

Length: 1,600 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

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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. 7

294-6497

Installation route: 大臂(附加装置)~小臂(附加装置)

Length: 1,200 mm
Specification: DN13;4SP-8;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

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Diagram Pipe No. 4

251-2627

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

Length: 1,900 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30°内锥

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Diagram Pipe No. 2

4I-1037

Installation route: 分配阀上~电磁阀(分配阀后)

Length: 1,400 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. 2

113-6741

Installation route: 小臂油缸锁止阀

Length: 2,950 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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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®312D L?

The current published data covers 14 systems and 74 hose records. Systems with more listed records include: Control Valve (15 hoses), Grease Lines (11 hoses), Attachments (9 hoses), Control Lever (8 hoses), Solenoid Valve (5 hoses), Pedal (5 hoses).

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

Based on published records with valid lengths, the range is 300–6,260 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 L?

The most frequent raw specifications in the current published records are: DN10;1SN-6;10.4Mpa (26 records), DN10;-6;10.3Mpa (11 records), DN6;-4;10.3Mpa (9 records), DN19;6SH-12;42Mpa (7 records), DN10;6SH-6;42Mpa (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®312D L?

Each record keeps the left and right fitting descriptions separate. Current examples: 108-9097: left 美制锥形外螺纹30°内锥; right 美制锥形外螺纹; 302-9326: left American female thread, flat-face seal; right American female thread, flat-face seal; 121-8662: left 美制锥形外螺纹; right 美制锥形外螺纹30°内锥. Open the exact part-number or pipe-number record; do not swap ends based on appearance alone.

Can I locate a Caterpillar CAT®312D L hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 2 (108-9097), Pipe No. 8 (302-9326), Pipe No. 4 (121-8662), Pipe No. 8 (397-8253). 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®312D L 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-174-312d-l--43415426233137343b33313244204c/

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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Hose Length and Fitting List

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