Hydraulic line repair data

Caterpillar CAT®M312 Attachments Hose List

Coverage details

Hoses: 18 records
Full specifications: 18 records
Systems: 1 systems
Length range: 500–7,700 mm

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Hose repair details

Hose Length and Fitting List

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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 7

179-5696

Installation route: 大臂(前段)~大臂(中段)

Length: 1,750 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

149-1830

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

Length: 700 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

119-6426

Installation route: 小臂(前段)~小臂(后段)

Length: 550 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. 1

150-2925

Installation route: 回转接头~接头(前桥)

Length: 2,000 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. 10

144-6057

Installation route: 液压油散热器~过渡阀块(回油滤芯)

Length: 2,800 mm
Specification: DN25;1SN-16;7Mpa
Left fitting: Light-series flangeOriginal Chinese: 法兰-轻型
Right fitting: 90° light-series flangeOriginal Chinese: 90°法兰-轻型

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Diagram Pipe No. 6

138-1907

Installation route: 电磁阀(前桥)~铁管(回转接头)

Length: 800 mm
Specification: DN10;2SN-6;33Mpa
Left fitting: 90° elbow, American female thread, flat-face sealOriginal Chinese: 90°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

124-6510

Installation route: 行走马达~前桥

Length: 400 mm
Specification: DN6;1SN-4;19.2Mpa
Left fitting: 90° elbow, American female thread, flat-face sealOriginal Chinese: 90°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. 7

139-7389

Installation route: 电磁阀(前桥)~铁管(回转接头)

Length: 650 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: 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. 8

149-6297

Installation route: 支腿架油缸~接头(前桥)

Length: 650 mm
Specification: DN10;2SN-6;33Mpa
Left fitting: 90° elbow, American female thread, flat-face sealOriginal Chinese: 90°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

9R-7366

Installation route: 大臂(前段)~小臂(后段)

Length: 900 mm
Specification: DN10;2SN-6;33Mpa
Left fitting: 90° elbow, American female thread, flat-face sealOriginal Chinese: 90°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

135-8274

Installation route: 大臂(前段)~小臂

Length: 905 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: 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. 4

145-7118

Installation route: 刹车过滤器~

Length: 2,200 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: 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. 3

178-2176

Installation route: 大臂(前段)~小臂(后段)

Length: 1,100 mm
Specification: DN10;2SN-6;33Mpa
Left fitting: 90° elbow, American female thread, flat-face sealOriginal Chinese: 90°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

142-4850

Installation route: 大臂(前段)~小臂

Length: 900 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: 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

145-9954

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

Length: 1,020 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: 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. 2

137-4610

Installation route: 大臂(前段)~小臂(后段)

Length: 990 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: 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. 8

129-9957

Installation route: 大臂(前段)~小臂

Length: 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: 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. 3

147-7811

Installation route: 接头(分配阀下右)~接头(发动机左)

Length: 400 mm
Specification: DN10;1SN-6;15.7Mpa
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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Diagram Pipe No. 2

145-9999

Installation route: 左推土铲油缸~右推土铲油缸

Length: 700 mm
Specification: DN10;2SN-6;33Mpa
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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Diagram Pipe No. 8

179-5693

Installation route: 铲斗倾斜油缸~接头(小臂)

Length: 650 mm
Specification: DN10;2SN-6;33Mpa
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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Diagram Pipe No. 11

145-7114

Installation route: 液压油散热器~过渡阀块(回油滤芯)

Length: 2,650 mm
Specification: DN25;1SN-16;7Mpa
Left fitting: 90° light-series flangeOriginal Chinese: 90°法兰-轻型
Right fitting: 90° light-series flangeOriginal Chinese: 90°法兰-轻型

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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.

How many hoses are currently listed for Caterpillar CAT®M312 Attachments?

There are 18 published records. 18 include a length, both end fittings, and a part number or diagram pipe number.

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

Based on published records with valid lengths, the range is 500–7,700 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 Attachments?

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

Each record keeps the left and right fitting descriptions separate. Current examples: 179-5697: left American female thread, flat-face seal; right American female thread, flat-face seal; 138-1909: left American female thread, flat-face seal; right American female thread, flat-face seal; 138-1904: 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 Attachments hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 8 (179-5697), Pipe No. 6 (138-1909), Pipe No. 1 (138-1904), Pipe No. 12 (150-7617). Open a record to compare its installation position with the linked manual page.