Proper hydraulic connection is essential for safe and reliable operation of the Lingdong Rotating Quick Coupler. Here’s a clear, step-by-step explanation of the oil circuits:
1. Blue Hydraulic Lines – Rotation Motor
These are the high-pressure bidirectional lines for the worm gear hydraulic motor.

Connect them to a bidirectional auxiliary circuit from the excavator’s main control valve.
This controls the clockwise and counterclockwise 360° rotation of the quick coupler.
They connect directly to the motor’s hydraulic ports on the side.

2. Orange Hydraulic Lines – Attachment Circuit
These are also high-pressure lines coming from the excavator’s main valve.

You can configure them as bidirectional or unidirectional, depending on the tool attached below the rotating quick coupler.
Bidirectional → for tools that need flow in both directions (e.g. hydraulic grapples, drum sweepers, augers).
Unidirectional → for tools that only need flow in one direction (e.g. hydraulic breaker, vibratory plate compactor).

The orange lines connect to the central hydraulic swivel in the middle of the Lingdong Rotating Quick Coupler.
This hydraulic swivel allows unlimited 360° rotation without twisting hoses.
From the bottom of the quick coupler, two orange ports exit — these ports rotate freely with the coupler. Simply connect your attachment hoses to these two bottom ports.

3. Green Hydraulic Lines – Quick Coupler Locking Cylinders
These are low-pressure bidirectional lines.

They control the double-lock flat-push quick coupler cylinders located at the bottom of the rotating quick coupler.
One direction locks the attachment, the other unlocks it.
Usually connected to the excavator’s original quick coupler circuit or an auxiliary low-pressure circuit.

Summary of Hydraulic Connections:

Blue → Bidirectional high pressure → Controls 360° rotation (worm motor)
Orange → High pressure (bi or uni-directional) → Powers the tool/attachment below
Green → Low pressure bidirectional → Locks and unlocks the bottom quick coupler

With this clean and logical layout, installation is straightforward, hoses stay untangled even during full rotation, and you get full power for both rotation and the attached tool.
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Need help with hose routing or choosing the right configuration for your excavator?
Contact Shandong Lingdong Intelligent Equipment — we’re happy to guide you! 🏗️