Hydraulic line repair data

Caterpillar CAT®M318 Boom Assembly Hose List

Coverage details

Hoses: 23 records
Full specifications: 23 records
Systems: 1 systems
Length range: 480–5,010 mm

Current system

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Hose repair details

Hose Length and Fitting List

Diagram Pipe No. 11

116-7260

Installation route: 大臂左1/左2/左3/左4

Length: 1,550 mm
Specification: DN25；6SH-16；42Mpa
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. 11

204-0689

Installation route: 大臂左1/左2/左3/左4

Length: 1,400 mm
Specification: DN25；6SH-16；42Mpa
Left fitting: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封
Right fitting: 45°美制内螺纹平面密封

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Diagram Pipe No. 6

115-8001

Installation route: 小臂油缸左(规格1)

Length: 800 mm
Specification: DN25；4SP-16；28Mpa
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

200-4052

Installation route: 铲斗油缸(规格4)

Length: 1,150 mm
Specification: DN25；6SH-16；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

128-4211

Installation route: 铲斗油缸~过渡接头(铲斗油缸旁)

Length: 1,370 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. 23

144-3078

Installation route: 大臂(右侧)~

Length: 2,903 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: 45° heavy-series flangeOriginal Chinese: 45°法兰-重型

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Diagram Pipe No. 14

179-5711

Installation route: 大臂油缸

Length: 480 mm
Specification: DN19；4SP-12；35Mpa
Left fitting: 30°法兰-重型
Right fitting: 30°法兰-重型

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Diagram Pipe No. 12

147-0009

Installation route: 大臂油缸

Length: 2,200 mm
Specification: DN25；4SP-16；35Mpa
Left fitting: 45° heavy-series flangeOriginal Chinese: 45°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. 17

203-2924

Installation route: 大臂左1/左4(分节油缸规格)

Length: 3,980 mm
Specification: DN25；6SH-16；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

122-2257

Installation route: 铲斗油缸(球阀规格)

Length: 1,110 mm
Specification: DN19；4SP-12；35Mpa
Left fitting: 90° heavy-series flangeOriginal Chinese: 90°法兰-重型
Right fitting: Heavy-series flangeOriginal Chinese: 法兰-重型

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Diagram Pipe No. 13

147-0012

Installation route: 大臂油缸

Length: 740 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

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Diagram Pipe No. 1

200-4052

Installation route: 铲斗油缸(后段)

Length: 1,150 mm
Specification: DN25；6SH-16；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

139-6793

Installation route: 大臂油缸

Length: 2,400 mm
Specification: DN25；4SP-16；35Mpa
Left fitting: 45° heavy-series flangeOriginal Chinese: 45°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. 3

139-6898

Installation route: 大臂油缸

Length: 1,530 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

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Diagram Pipe No. 3

124-1039

Installation route: 小臂油缸(规格2)

Length: 770 mm
Specification: DN25；4SP-16；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. 18

223-3305

Installation route: 大臂左2/左3(分节油缸规格)

Length: 5,010 mm
Specification: DN25；6SH-16；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

141-9099

Installation route: 大臂~分配阀

Length: 1,350 mm
Specification: DN25；4SP-16；35Mpa
Left fitting: American female thread, flat-face sealOriginal Chinese: 美制内螺纹平面密封
Right fitting: 45°美制内螺纹平面密封

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Diagram Pipe No. 15

128-9475

Installation route: 分节油缸

Length: 720 mm
Specification: DN16；6SH-10；42Mpa
Left fitting: 90° heavy-series flangeOriginal Chinese: 90°法兰-重型
Right fitting: Heavy-series flangeOriginal Chinese: 法兰-重型

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Diagram Pipe No. 10

116-7255

Installation route: 右大臂油缸

Length: 650 mm
Specification: DN19；4SP-12；35Mpa
Left fitting: 90° heavy-series flangeOriginal Chinese: 90°法兰-重型
Right fitting: Heavy-series flangeOriginal Chinese: 法兰-重型

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Diagram Pipe No. 5

145-4958

Installation route: 铲斗油缸(规格3)

Length: 1,450 mm
Specification: DN25；4SP-16；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. 9

116-7254

Installation route: 左大臂油缸

Length: 740 mm
Specification: DN19；4SP-12；35Mpa
Left fitting: 90° heavy-series flangeOriginal Chinese: 90°法兰-重型
Right fitting: Heavy-series flangeOriginal Chinese: 法兰-重型

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Diagram Pipe No. 20

142-7439

Installation route: 分节油缸右

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. 1

200-4052

Installation route: 铲斗油缸(前段)

Length: 1,150 mm
Specification: DN25；6SH-16；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

View full repair specifications

Workshop guide

Finding the correct hydraulic hose for Caterpillar CAT®M318 Boom Assembly

Start with the machine and route

For Caterpillar CAT®M318 Boom Assembly, identify the exact model and hydraulic system on the machine first. A part number or diagram pipe number is the fastest way to narrow a replacement hose; if neither is visible, compare the installation route and the existing hose.

See all Caterpillar CAT®M318 systems

Read the dimensions before cutting

Check whether a listed dimension is finished assembly length, hose-only length, or cut length. These are not interchangeable. Confirm hose specification and pressure rating, then compare both ends separately: thread, sealing seat, size, angle, and orientation.

Records to compare

116-72601,550 mm · DN25；6SH-16；42Mpa · 大臂左1/左2/左3/左4
204-06891,400 mm · DN25；6SH-16；42Mpa · 大臂左1/左2/左3/左4
115-8001800 mm · DN25；4SP-16；28Mpa · 小臂油缸左(规格1)

Use the drawing as a location check

Where an installation drawing or manual figure is available, match its callout to the part number and physical route. A hydraulic circuit diagram explains connections but does not show the exact routing of a hose on the machine. Take the old hose or clear end-fitting photographs to the workshop if any dimension is missing.

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®M318 Boom Assembly?

There are 23 published records. 23 include a length, both end fittings, and a part number or diagram pipe number.

What is the hose length range for Caterpillar CAT®M318 Boom Assembly?

Based on published records with valid lengths, the range is 480–5,010 mm. Open the individual record to verify its installation position and both end fittings before fabrication.

Which hose specifications are common for Caterpillar CAT®M318 Boom Assembly?

The most frequent raw specifications in the current published records are: DN19；4SP-12；35Mpa (9 records), DN25；6SH-16；42Mpa (7 records), DN25；4SP-16；35Mpa (5 records), DN16；6SH-10；42Mpa (1 records), DN25；4SP-16；28Mpa (1 records). Verify the specification together with length, pressure, and fitting details.

How can I identify the left and right hose fittings for Caterpillar CAT®M318 Boom Assembly?

Each record keeps the left and right fitting descriptions separate. Current examples: 116-7260: left Heavy-series flange; right Heavy-series flange; 204-0689: left American female thread, flat-face seal; right 45°美制内螺纹平面密封; 115-8001: left Heavy-series flange; right Heavy-series flange. Open the exact part-number or pipe-number record; do not swap ends based on appearance alone.

Can I locate a Caterpillar CAT®M318 Boom Assembly hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 11 (116-7260), Pipe No. 11 (204-0689), Pipe No. 6 (115-8001), Pipe No. 1 (200-4052). Open a record to compare its installation position with the linked manual page.