Hydraulic line repair data

Caterpillar CAT®312D Grease Lines Hose List

Coverage details

Hoses: 3 records
Full specifications: 3 records
Systems: 1 systems
Length range: 2,000–2,650 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. 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

View full repair specifications

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

View full repair specifications

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

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®312D Grease Lines?

There are 3 published records. 3 include a length, both end fittings, and a part number or diagram pipe number.

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

Based on published records with valid lengths, the range is 2,000–2,650 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 Grease Lines?

The most frequent raw specifications in the current published records are: DN6;-4;10.3Mpa (3 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 Grease Lines?

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; 203-7401: left 美制锥形外螺纹30°内锥; right 美制锥形外螺纹; 121-8662: left 美制锥形外螺纹; right 美制锥形外螺纹30°内锥. Open the exact part-number or pipe-number record; do not swap ends based on appearance alone.

Can I locate a Caterpillar CAT®312D Grease Lines hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 3 (121-8659), Pipe No. 7 (203-7401), Pipe No. 4 (121-8662). Open a record to compare its installation position with the linked manual page.