Hydraulic line repair data

Caterpillar CAT®312D Hose Length & Fitting Data

Coverage details

Hoses: 34 records
Full specifications: 34 records
Systems: 11 systems
Length range: 380–2,650 mm

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Control ValveControl LeverAttachments – BreakerBoom AssemblySolenoid ValveGrease LinesPedalAttachments – Quick Coupler

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Technician notes

Workshop measurements

These notebook pages may help identify a hose or compare a recorded length. Confirm the final length, fittings, pressure rating, and routing on the machine before fabrication.

卡特 CAT®312D hydraulic hose part numbers and recorded lengths — technician notebook page 4 of 5 — Notebook page 4 of 5View full-size

卡特 CAT®312D hydraulic hose part numbers and recorded lengths — technician notebook page 3 of 5 — Notebook page 3 of 5View full-size

卡特 CAT®312D hydraulic hose part numbers and recorded lengths — technician notebook page 5 of 5 — Notebook page 5 of 5View full-size

卡特 CAT®312D hydraulic hose part numbers and recorded lengths — technician notebook page 1 of 5 — Notebook page 1 of 5View full-size

卡特 CAT®312D hydraulic hose part numbers and recorded lengths — technician notebook page 2 of 5 — Notebook page 2 of 5View full-size

Workshop measurements
Part number	Recorded length
4I-5900	900 mm
282-7206	1,300 mm
129-5959	3,000 mm
292-7183	350 mm
7Y-5088	1,150 mm
292-7176	960 mm
111-6752	2,200 mm
4I-5933	1,600 mm
286-6461	2,700 mm
317-4846	3,620 mm
184-9420	320 mm
087-5775	1,130 mm
319-9966	870 mm
131-9907	920 mm
7Y-4199	1,800 mm
192-6775	1,400 mm
292-7427	1,400 mm
199-1689	960 mm
178-5955	610 mm
199-1689	960 mm
292-7424	1,280 mm
123-2636	760 mm
108-7375	1,800 mm
319-9966	870 mm
325-9033	690 mm
236-2843	1,200 mm
5I-8708	950 mm
199-1914	370 mm
282-7171	880 mm

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

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

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Diagram Pipe No. 2

277-1251

Installation route: 大臂(快换)~小臂(快换)

Length: 1,400 mm
Specification: DN13;6SH-8;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. 24

282-7566

Installation route: 分配阀右上~电磁阀(液压泵后下)

Length: 1,800 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: 分配阀后左~右过渡阀块(破碎器)

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. 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. 1

4I-1095

Installation route: 小臂油缸

Length: 775 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. 3

325-8776

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

Length: 520 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. 5

269-9714

Installation route: 液压油箱~液压油过滤器

Length: 420 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. 1

4I-3994

Installation route: 分配阀前左~电磁阀(分配阀前下)

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

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Diagram Pipe No. 4

202-4010

Installation route: 分配阀下~控制阀(回转接头右)

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. 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. 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. 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. 11

275-1538

Installation route: 中转接头~模式转换阀

Length: 520 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. 3

4I-3988

Installation route: 中转接头~分配阀上右

Length: 2,250 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

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. 29

4I-1037

Installation route: 电磁阀(分配阀下)~电磁阀(分配阀上右)

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. 5

307-5096

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

Length: 1,800 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. 16

4I-1037

Installation route: 中转接头~分配阀下右

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. 19

337-1286

Installation route: 大臂(快换)~分配阀前右

Length: 860 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

187-6692

Installation route: 小臂破碎器截止阀左

Length: 1,500 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. 11

282-7095

Installation route: 中转接头~模式转换阀

Length: 540 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. 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. 3

4I-3988

Installation route: 行走踏板~分配阀

Length: 2,250 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. 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

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Diagram Pipe No. 17

104-8973

Installation route: 中转接头~分配阀上左

Length: 1,700 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. 34

5I-4076

Installation route: 分配阀上右~电磁阀(分配阀下)

Length: 1,350 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. 12

5I-4076

Installation route: 分配阀上左~电磁阀(分配阀右前)

Length: 1,350 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. 1

5I-4076

Installation route: 分配阀上~电磁阀(分配阀下)

Length: 1,350 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. 13

7I-8252

Installation route: 行走踏板~分配阀

Length: 2,350 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. 56

307-4969

Installation route: 分配阀下左~过渡阀块(分配阀下)

Length: 380 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. 4

087-4503

Installation route: 电磁阀(分配阀下)~控制阀(回转接头右)

Length: 850 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

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. 8

288-7723

Installation route: 小臂破碎器截止阀

Length: 1,450 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. 10

087-4402

Installation route: 左手柄~进回油阀

Length: 480 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: 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. 25

292-7428

Installation route: 左手柄~中转接头

Length: 1,460 mm
Specification: DN10;1SN-6;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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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?

The current published data covers 11 systems and 34 hose records. Systems with more listed records include: Control Valve (8 hoses), Control Lever (6 hoses), Attachments – Breaker (4 hoses), Boom Assembly (3 hoses), Solenoid Valve (3 hoses), Grease Lines (3 hoses).

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

Based on published records with valid lengths, the range is 380–2,650 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?

The most frequent raw specifications in the current published records are: DN10;1SN-6;10.4Mpa (13 records), DN10;-6;10.3Mpa (6 records), DN19;6SH-12;42Mpa (4 records), DN6;-4;10.3Mpa (3 records), DN16;6SH-10;42Mpa (2 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?

Each record keeps the left and right fitting descriptions separate. Current examples: 121-8659: left 美制锥形外螺纹30°内锥; right 美制锥形外螺纹; 277-1251: left American female thread, flat-face seal; right American female thread, flat-face seal; 282-7566: 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®312D hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 3 (121-8659), Pipe No. 2 (277-1251), Pipe No. 24 (282-7566), Pipe No. 12 (282-7150). 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 Hose Length & Fitting 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--43415426233137343b33313244/

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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Workshop measurements

Hose Length and Fitting List

Common Repair Questions

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