Hydraulic line repair data

Caterpillar CAT®312E Supply and Return Valve Hose List

Coverage details
Hoses
2 records
Full specifications
2 records
Systems
1 systems
Length range
1,520–3,300 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.

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Hose repair details

Hose Length and Fitting List

Diagram Pipe No. 6

4I-6118

Installation route: Installation route — English review pendingOriginal Chinese: 进回油阀~蓄能器电磁阀(液压泵后下)

Length
3,300 mm
Specification
DN13;1SN-8;10.4Mpa
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. 49

368-0373

Installation route: Installation route — English review pendingOriginal Chinese: 进回油阀~过渡阀块(分配阀下)

Length
1,520 mm
Specification
DN13;-8;10.3Mpa
Left fitting
45° elbow, American female thread, flat-face sealOriginal Chinese: 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

Workshop guide

Finding the correct hydraulic hose for Caterpillar CAT®312E Supply and Return Valve

Start with the machine and route

For Caterpillar CAT®312E Supply and Return Valve, 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®312E 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

  • 4I-61183,300 mm · DN13;1SN-8;10.4Mpa · Installation route — English review pending
  • 368-03731,520 mm · DN13;-8;10.3Mpa · Installation route — English review pending

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®312E Supply and Return Valve?

There are 2 published records. 2 include a length, both end fittings, and a part number or diagram pipe number.

What is the hose length range for Caterpillar CAT®312E Supply and Return Valve?

Based on published records with valid lengths, the range is 1,520–3,300 mm. Open the individual record to verify its installation position and both end fittings before fabrication.

Which hose specifications are common for Caterpillar CAT®312E Supply and Return Valve?

The most frequent raw specifications in the current published records are: DN13;-8;10.3Mpa (1 records), DN13;1SN-8;10.4Mpa (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®312E Supply and Return Valve?

Each record keeps the left and right fitting descriptions separate. Current examples: 4I-6118: left American female thread, flat-face seal; right 90° elbow, American female thread, flat-face seal; 368-0373: left 45° elbow, 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®312E Supply and Return Valve hose by diagram pipe number?

Yes. Current examples with a diagram pipe number are: Pipe No. 6 (4I-6118), Pipe No. 49 (368-0373). Open a record to compare its installation position with the linked manual page.

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