Hydraulic line repair data

Caterpillar CAT®M312 Boom Assembly Hose List

Coverage details

Hoses: 6 records
Full specifications: 6 records
Systems: 1 systems
Length range: 680–5,000 mm

Current system

Find a hose in this system

Use the number on the diagram, a part number, connection point, length, hose size, or fitting.

Pipe number, part number, route, length, or fittingSearch another machine

Hose repair details

Hose Length and Fitting List

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

View full repair specifications

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

View full repair specifications

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

View full repair specifications

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

View full repair specifications

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

View full repair specifications

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

View full repair specifications

Diagram Pipe No. 4

145-4959

Installation route: 铲斗油缸(2.3M)

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: 90° heavy-series flangeOriginal Chinese: 90°法兰-重型

View full repair specifications

Diagram Pipe No. 11

204-0688

Installation route: 大臂左1/左2/左3/左4

Length: 1,500 mm
Specification: DN19;6SH-12;42Mpa
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

View full repair specifications

Diagram Pipe No. 12

150-7616

Installation route: 左大臂油缸

Length: 720 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: 90° heavy-series flangeOriginal Chinese: 90°法兰-重型

View full repair specifications

Diagram Pipe No. 24

150-7620

Installation route: 大臂左3(分节油缸规格)

Length: 4,940 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: 90° heavy-series flangeOriginal Chinese: 90°法兰-重型

View full repair specifications

Diagram Pipe No. 22

150-7614

Installation route: 分节油缸(后段)

Length: 2,950 mm
Specification: DN19;4SP-12;35Mpa
Left fitting: 60°法兰-重型
Right fitting: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封

View full repair specifications

Diagram Pipe No. 10

142-4847

Installation route: 大臂(前段)~大臂(中段)

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: 90° elbow, American female thread, flat-face sealOriginal Chinese: 90°美制内螺纹平面密封

View full repair specifications

Diagram Pipe No. 7

176-3276

Installation route: 小臂(前段)~接头(小臂)

Length: 980 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

View full repair specifications

Diagram Pipe No. 6

148-9486

Installation route: 右大臂油缸

Length: 1,550 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: 90° heavy-series flangeOriginal Chinese: 90°法兰-重型

View full repair specifications

Diagram Pipe No. 4

151-0022

Installation route: 铲斗油缸(1.6M)

Length: 1,440 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: 90° heavy-series flangeOriginal Chinese: 90°法兰-重型

View full repair specifications

Diagram Pipe No. 4

152-0180

Installation route: 铲斗油缸(3M)

Length: 1,400 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: 90° heavy-series flangeOriginal Chinese: 90°法兰-重型

View full repair specifications

Diagram Pipe No. 4

223-3304

Installation route: 铲斗油缸(2M)

Length: 1,060 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: 90° heavy-series flangeOriginal Chinese: 90°法兰-重型

View full repair specifications

Diagram Pipe No. 4

223-3304

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

Length: 1,060 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: 90° heavy-series flangeOriginal Chinese: 90°法兰-重型

View full repair specifications

Diagram Pipe No. 8

148-9488

Installation route: 左大臂油缸~右大臂油缸

Length: 470 mm
Specification: DN19;4SP-12;35Mpa
Left fitting: 30°法兰-重型
Right fitting: 30°法兰-重型

View full repair specifications

Diagram Pipe No. 21

150-7613

Installation route: 分节油缸(后段)

Length: 2,400 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: 90° heavy-series flangeOriginal Chinese: 90°法兰-重型

View full repair specifications

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 Boom Assembly?

There are 6 published records. 6 include a length, both end fittings, and a part number or diagram pipe number.

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

Based on published records with valid lengths, the range is 680–5,000 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 Boom Assembly?

The most frequent raw specifications in the current published records are: DN19;4SP-12;35Mpa (6 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 Boom Assembly?

Each record keeps the left and right fitting descriptions separate. Current examples: 142-4845: left American female thread, flat-face seal; right American female thread, flat-face seal; 145-4968: left Heavy-series flange; right American female thread, flat-face seal; 142-7439: 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 Boom Assembly hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 6 (142-4845), Pipe No. 8 (145-4968), Pipe No. 9 (142-7439), Pipe No. 26 (148-7094). Open a record to compare its installation position with the linked manual page.