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1. What type of hydraulic pump is the Sauer Danfoss KC Series?
The Sauer Danfoss KC38/KC45/KC38C/KC45D Series are high-pressure variable displacement axial piston pumps engineered for heavy-duty mobile and industrial hydraulic systems. They are renowned for robust performance, high efficiency, and precise flow control, specifically designed to handle extreme pressure and load demands in harsh operating environments.
2. What are the key differences between KC38, KC45, KC38C, and KC45D sub-series?
The sub-series are differentiated by displacement range, structural optimization, and application focus:
- KC38/KC45: Base models with core displacement ratings (KC38: ~38 cm³/rev; KC45: ~45 cm³/rev). KC38 suits medium-load systems, while KC45 caters to higher-flow, heavy-load applications.
- KC38C/KC45D: Enhanced variants with upgraded components (e.g., hardened cylinder blocks, improved seals) for extended service life. KC45D further optimizes hydraulic efficiency and supports advanced control modes, ideal for precision-dependent systems.
3. What are the core performance specifications of the KC Series (e.g., KC45D)?
- Maximum Working Pressure: Up to 55 MPA (550 kgf/cm²); rated pressure 45 MPa for continuous operation.
- ช่วงความเร็ว: Minimum 800 รอบต่อนาที (to prevent cavitation); rated 1500–2500 rpm; maximum 3000 รอบต่อนาที.
- Output Flow: Calculated by Flow (l/นาที) = Displacement (cm³/rev) × Speed (รอบต่อนาที) ÷ 1000. Example: KC45D at 2000 rpm → 45 × 2000 ÷ 1000 = 90 l/นาที (actual flow adjusts via variable displacement control).
- ประสิทธิภาพปริมาตร: ≥ 95% (under rated pressure/speed); total efficiency ≥ 90%.
- Control Modes: Standard options include pressure-compensated, load-sensing, and electro-proportional control (varies by the “ดี” segment in the model).
4. What applications are the KC Series pumps suitable for?
They are optimized for high-pressure, heavy-duty hydraulic systems requiring reliability and precision:
- Mobile machinery: Excavators, wheel loaders, mining trucks, agricultural harvesters, and construction cranes.
- Industrial machinery: Hydraulic presses, metal forming equipment, marine winches, and offshore drilling systems.
- Specialized systems: Waste compactors, forestry machinery, and utility vehicles (e.g., snowplows, road pavers).
5. What hydraulic fluids are compatible with these piston pumps?
- Recommended: Mineral-based hydraulic oils (isos vg 32, VG 46, or VG 68) with viscosity 15–46 cSt.
- Compatible alternatives: Synthetic hydraulic oils (PAO, ester-based) and biodegradable oils (for eco-sensitive applications like agriculture or marine use).
- Restrictions: Avoid oils with particle contamination > 10 μm or incompatible additives (refer to Sauer Danfoss’s fluid compatibility manual).
6. What maintenance is required for the KC Series pumps?
- Oil Filtration: Use a ≥ 10 μm precision oil filter; replace filters every 2000–2500 operating hours.
- Fluid Maintenance: Monitor oil temperature (10–60°C optimal) and replace hydraulic oil every 5000–8000 hours (or sooner in dusty/extreme conditions).
- Component Inspection: Check shaft seals, O-rings, and piston packs quarterly for leaks; replace worn parts (e.g., ลูกสูบ, valve plates) at 10,000–15,000 hours.
- Startup & Shutdown: Prime the pump with oil before startup to avoid dry friction; relieve system pressure before shutdown to prevent seal damage.
