Hydraulic line repair data

Caterpillar CAT®M312 Hose Repair Data

Coverage details

Hoses: 43 records
Full specifications: 43 records
Systems: 9 systems
Length range: 370–7,700 mm

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AttachmentsBoom AssemblyAttachments – BreakerPedalAttachments – Lock ValveSwivel Joint

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Hose Length and Fitting List

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

Diagram Pipe No. 33

151-8203

Installation route: 蓄能器电磁阀(驾驶室升降架下)~大臂(后段)

Length: 7,000 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

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Diagram Pipe No. 8

179-5697

Installation route: 分配阀~大臂(中段)

Length: 5,800 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

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Diagram Pipe No. 15

177-2177

Installation route: 分配阀下左~回转马达

Length: 670 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. 2

9U-4915

Installation route: 回转接头~液压油箱

Length: 1,070 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. 6

138-1909

Installation route: 推土铲油缸~电磁阀(推土铲油缸)

Length: 500 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

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Diagram Pipe No. 6

142-4845

Installation route: Arm cylinder — leftOriginal Chinese: 小臂油缸左

Length: 1,045 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. 8

145-4968

Installation route: 铲斗油缸~分流阀(小臂)

Length: 1,020 mm
Specification: DN19;4SP-12;35Mpa
Left fitting: Heavy-series flangeOriginal Chinese: 法兰-重型
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

138-1904

Installation route: 推土铲油缸~铁管(大臂下)

Length: 800 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

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Diagram Pipe No. 12

150-7617

Installation route: 蓄能器电磁阀(驾驶室升降架下)~大臂(前段)

Length: 5,000 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

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Diagram Pipe No. 9

151-0128

Installation route: Left boom-cylinder lock valve → right boom-cylinder lock valveOriginal Chinese: 左大臂油缸锁止阀~右大臂油缸锁止阀

Length: 370 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. 5

138-1904

Installation route: 推土铲油缸~铁管(大臂下)

Length: 800 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

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Diagram Pipe No. 10

151-4617

Installation route: 回转接头~后桥

Length: 2,000 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

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Diagram Pipe No. 7

139-1941

Installation route: 电磁阀(推土铲油缸)~铁管(大臂下)

Length: 650 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

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Diagram Pipe No. 9

142-7439

Installation route: 分节油缸右(前段)

Length: 680 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. 3

133-3806

Installation route: 分配阀前左~控制阀(驾驶室升降架下)

Length: 1,425 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

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Diagram Pipe No. 5

179-5694

Installation route: 分配阀~大臂(前段)

Length: 6,950 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

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Diagram Pipe No. 7

155-6478

Installation route: 大臂(前段)~大臂(后段)

Length: 7,700 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

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Diagram Pipe No. 5

147-0014

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

Length: 3,950 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. 7

156-0819

Installation route: 大臂(中段)~大臂(后段)

Length: 5,000 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. 26

148-7094

Installation route: 大臂(中段)~大臂(后段)

Length: 5,000 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. 5

150-7615

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

Length: 3,950 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. 11

145-4969

Installation route: 蓄能器电磁阀(驾驶室升降架下)~大臂(前段)

Length: 2,500 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

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Diagram Pipe No. 8

148-7541

Installation route: 回转接头~分配阀前左

Length: 930 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: Heavy-series flangeOriginal Chinese: 法兰-重型

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Diagram Pipe No. 23

150-7619

Installation route: 大臂左2(分节油缸规格)

Length: 4,920 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. 7

145-4967

Installation route: 分流阀(小臂)~堵头

Length: 1,175 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: Heavy-series flangeOriginal Chinese: 法兰-重型

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Diagram Pipe No. 15

147-0014

Installation route: 大臂左1/左4(分节油缸规格)

Length: 3,950 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. 3

9R-9086

Installation route: 制动踏板~液压油过滤器(驾驶室后)

Length: 1,405 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

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Diagram Pipe No. 3

149-0197

Installation route: 大臂(前段)~大臂(中段)

Length: 1,600 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

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Diagram Pipe No. 8

144-2560

Installation route: 制动踏板~蓄能器

Length: 730 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. 2

147-0014

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

Length: 3,950 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. 6

129-9141

Installation route: 分流阀(小臂)~堵头

Length: 1,250 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

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Diagram Pipe No. 1

141-7730

Installation route: 小臂(前段)~小臂(后段)

Length: 660 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

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Diagram Pipe No. 2

143-4730

Installation route: 方向盘~驾驶室后

Length: 1,500 mm
Specification: DN13;1SN-8;14Mpa
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

179-5695

Installation route: 分配阀~大臂(前段)

Length: 6,700 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

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Diagram Pipe No. 6

148-7094

Installation route: 大臂(中段)~大臂(后段)

Length: 5,000 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. 5

149-6248

Installation route: 方向盘~分配阀下左

Length: 3,400 mm
Specification: DN13;1SN-8;14Mpa
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®M312?

The current published data covers 9 systems and 43 hose records. Systems with more listed records include: Attachments (18 hoses), Boom Assembly (6 hoses), Attachments – Breaker (5 hoses), Pedal (4 hoses), Attachments – Lock Valve (4 hoses), Swivel Joint (3 hoses).

What is the hose length range for Caterpillar CAT®M312?

Based on published records with valid lengths, the range is 370–7,700 mm. Open the individual record to verify its installation position and both end fittings before fabrication.

Which hose specifications are common for Caterpillar CAT®M312?

The most frequent raw specifications in the current published records are: DN10;2SN-6;33Mpa (18 records), DN19;4SP-12;35Mpa (12 records), DN10;1SN-6;15.7Mpa (4 records), DN13;1SN-8;14Mpa (2 records), DN19;1SN-12;8.7Mpa (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®M312?

Each record keeps the left and right fitting descriptions separate. Current examples: 151-8203: left American female thread, flat-face seal; right American female thread, flat-face seal; 179-5697: left American female thread, flat-face seal; right American female thread, flat-face seal; 177-2177: 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®M312 hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 33 (151-8203), Pipe No. 8 (179-5697), Pipe No. 15 (177-2177), Pipe No. 2 (9U-4915). 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®M312 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-m312--43415426233137343b4d333132/

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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