171-0060 Main Relief Valve 352-7228 3527228 for E345B E345C E349D E349B E349C 349D 390F L Excavators

171-0060 Main Relief Valve 352-7228 3527228 for E345B E345C E349D E349B E349C 349D 390F L Excavators

 Key attributes

Critical Overload Protection
  The core function of this main relief valve is to provide precise and rapid overload protection for the entire hydraulic system. When system pressure reaches the preset limit, the valve opens instantly to return excess hydraulic oil to the tank, preventing pressure from rising further. This effectively prevents costly damage to the main pump, control valves, cylinders, and other core components caused by overloading.

Enhanced Performance & Stability
  This valve is an improved new mode:
Better Set Point Retention – Maintains the preset pressure value more consistently over time.
Improved System Stability – Enhances the overall smoothness and reliability of hydraulic system operation.
Superior Overall Performance – Delivers better hydraulic system performance across all working conditions.

Rugged Construction for Extreme Conditions
Engineered specifically for demanding construction environments, this valve is manufactured to the highest standards:
Rugged Valve Body – Constructed from zinc-plated steel for excellent corrosion resistance.
Hardened Internal Components – Internal parts are made of hardened and ground steel to withstand extreme pressures and wear.

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GVO – Why Customers Choose Us, Again and Again

1. Massive Inventory – 40,000 m³ of ready stock means we have what you need, when you need it.
2. Unmatched Speed – Fast shipping is our standard, not our exception.
3. Precision Matching – We verify every part against your machine specification before it ships.
4. Brand Coverage – We stock parts for Komatsu, CAT, Kobelco, Hitachi, Volvoo, Hyundai, Doosan, Sany, XCMG, and more. 
5. Flexible Options – We offer what fits your budget and requirements.
6. Honest Pricing – No hidden fees, no markups. What you see is what you pay.
7. Reliable Support – We don't disappear after the sale. We're here before, during, and after.