723-10-19900 Hydraulic Relief Valve for Komatsu WB93R-5, WB97R-5, WB93R-8

   The 723-10-19900 relief valve is engineered for the high-duty cycles of Komatsu’s rigid-frame backhoe loaders. Whether the machine is equipped with the standard Stage IIIA engine (Dash-5) or the modern EU Stage IV/V engines (Dash-8), this valve maintains the integrity of the HydrauMind system. It allows for precise, simultaneous movements of the backhoe and loader arms by ensuring that excess pressure is efficiently vented back to the tank without causing "dead-heading" of the pump.

The SPARKLING MACHINERY NEW 723-10-19900 Relief valve Photo:

Why Choose the SPARKLING 723-10-19900 Relief valve?

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •    - Dual-Generation Compatibility: Fits both the venerable Dash-5 series and the latest Dash-8 models.

                                                                •    - Hardened Alloy Steel: Built to resist the erosive effects of high-velocity hydraulic oil, maintaining a tight seal over thousands of hours.

                                                                •    - Tamper-Resistant Adjustment: Designed to hold its factory pressure setting despite the extreme vibrations common in backhoe operations.

                                                                •    - Plug-and-Play Installation: Direct thread-in cartridge design makes field replacement fast, minimizing downtime on the job site.

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Q&A Section

Q1: What are the signs that my 723-10-19900 valve has failed?

A: If your backhoe struggles to lift a full bucket or the digging force feels "spongy" even when the engine is at full RPM, the relief valve may be bypassing oil too early. You may also notice the hydraulic oil overheating rapidly.

Q2: Is the 723-10-19900 an adjustable valve?

A: It features a mechanical adjustment; however, it is strictly recommended to set this using a hydraulic pressure gauge. Setting the relief pressure too high can burst hoses or crack the main pump housing.

Q3: Can I use this valve on the 4-Wheel Steer (S-Series) models?

A: While the WB93S and WB97S share many parts, you must verify your specific parts manual. R-series and S-series machines often use different control valve manifolds with unique relief specifications.

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   - Founded in 2013, SPARKLING focuses on high-quality excavator parts across hydraulics, undercarriage, engines and electrical systems. We prioritize stability, precision and continuous service, offering worldwide distribution, tailored solutions and strict QC to help customers reduce cost and increase uptime.

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