XCMG Hydraulic Two-way Lock / Bilateral Pilot-controlled Valve 803000738 SO-K8L-J7 XZZX-B202

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XCMG Hydraulic Two-way Lock / Bilateral Pilot-controlled Valve 803000738 SO-K8L-J7 XZZX-B202

Product Functions
1. Prevents "soft-leg" sinking: Once the crane extends its four heavy-duty outriggers, this bidirectional lock firmly traps the high-pressure hydraulic fluid within the outrigger cylinders, preventing backflow. This ensures that even when the crane is lifting loads weighing tens of tons, the outriggers will not slowly retract on their own (thereby preventing leg retraction and sinking).
2. Burst-proof protection: In the event that an external hydraulic hose suddenly ruptures during lifting operations, the bidirectional lock automatically and instantly engages to securely lock the cylinders, preventing the crane from tipping over catastrophically.

3. Safety Lock: Once the operating handle returns to the neutral position (meaning the button is released), the hydraulic pressure on both sides instantly dissipates. The central piston returns to its original position, and the two check valves-driven by powerful springs-snap shut simultaneously, securely locking the oil within the cylinder; the outrigger is then immobilized, effectively locked in place.

Common Faults and Symptoms
If the internal valve spool of the hydraulic lock is worn, jammed by foreign matter, or has damaged seals, it typically results in the following issues:
1. A specific outrigger slowly sinks while the crane is lifting a heavy load.
2. Noticeable intermittent sticking, jerking, violent shaking, or abnormal noise occurs during the retraction or extension of the outrigger.

The inlet and return ports at the bottom of the valve body are fitted with standard, highly wear-resistant rubber O-rings. Whenever the hydraulic lock is disassembled or serviced, these O-rings must be replaced with new ones; otherwise, even slight oil leakage is highly likely to occur, causing the outrigger to gradually sink.

DETAILS

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