Sany 75 Husk Distribution Valve
6 month ago
Product details
1. Product Overview
TheOriginal Equipment Pilot Gear Pump Rear Pumpis a factory-fitted gear pump component designed for construction machinery, industrial equipment, and other hydraulic systems. It primarily serves as apilot control pumporauxiliary lubrication pump, generating stable flow through gear meshing to supply power to system pilot valves, lubrication circuits, or cooling circuits. This ensures precise control and reliable operation of main pumps and actuators (e.g., hydraulic cylinders, motors).
2. Core Technical Features
(1) Structure and Materials
• Pump Body Material: High-strength cast iron (e.g., HT250) or aluminum alloy (e.g., ADC12), precision-cast and surface-treated for impact resistance and corrosion resistance.
• Gear Design:
• Type: Involute external gearing with optimized tooth profiles to reduce noise and vibration.
• Material: Alloy steel (e.g., 20CrMnTi), carburized and quenched for a tooth surface hardness of HRC 58-62, ensuring wear resistance.
• Shaft Seal System: Dual-lip rubber seals (NBR material) + metal-framed oil seals, rated for ≤3.5 MPa pressure to prevent hydraulic oil leakage.
(2) Performance Parameters
【表格】
Parameter Specification
Displacement 0.5–10 mL/r (adjustable by model)
Rated Pressure 10–25 MPa (continuous operation)
Peak Pressure ≤35 MPa (short-term allowable)
Speed Range 600–3000 rpm (matches engine RPM)
Volumetric Efficiency ≥85% (@2000 rpm, 10 MPa)
Noise Level ≤75 dB(A) (at 1-meter distance)
(3) Pilot Control-Specific Design
• Flow Stability: Precision-machined gear pairs (tooth profile error ≤0.01mm) ensure pilot oil pressure fluctuations ≤±0.5 MPa.
• Contamination Resistance: Built-in filter screen (filtration精度 20–50μm) traps debris, extending system lifespan.
• Low-Temperature Startup: Optional preheating device (e.g., electric heating jacket) for operation in -40°C environments.
3. Typical Applications
(1) Construction Machinery
• Excavators: Acts as a pilot pump for multi-way valves and slewing motors, enabling precise operation.
• Wheel Loaders: Drives hydraulic cylinders (e.g., boom, bucket) for improved action response.
• Cranes: Supplies stable pressure to luffing and slewing mechanism hydraulic locks, preventing load drops.
(2) Industrial Equipment
• Injection Molding Machines: Provides pilot control pressure for mold opening/closing and injection actions.
• Die-Casting Machines: Drives clamping mechanism rapid movement and pressure holding for precision molding.
• Machine Tools: Functions as a lubrication pump for forced lubrication of guide rails and ball screws.
(3) Agricultural Machinery
• Combine Harvesters: Powers hydraulic circuits for header lifting and threshing drum speed control.
• Tractors: Drives rear-mounted system lifting/lowering.
4. Installation and Maintenance Guidelines
(1) Installation Key Points
• Flow Direction: Align pump arrow with hydraulic oil flow direction to avoid reverse installation and gear dry-running.
• Coupling Alignment: Ensure motor and pump shaft alignment error ≤0.05mm to prevent vibration.
• Initial Oil Filling: Pre-fill hydraulic oil via the oil inlet to the mid-level of the oil gauge before first operation to expel air.
(2) Maintenance Schedule
• Daily Checks: Inspect oil level, leaks, and abnormal noise every 100 hours.
• Periodic Replacements:
• Hydraulic oil: Replace every 2000 hours (recommend ISO VG46 anti-wear hydraulic oil).
• Filter element: Clean or replace every 500 hours.
• Fault Diagnosis:
• Insufficient Flow: Check gear wear, filter clogging, or suction line air leaks.
• Abnormal Noise: Inspect gear meshing or bearing damage (disassembly required).
• Leakage: Replace shaft seals or check for pump body cracks (cracks >0.5mm deep require factory repair).
5. Selection Recommendations
• Displacement Matching: Select pump displacement based on pilot system flow requirements (e.g., 0.5–2 L/min per valve) to avoid energy waste.
• Pressure Adaptation: Upgrade to high-pressure models (e.g., HP series) for systems exceeding 25 MPa.
• Environmental Adaptation:
• High-humidity environments: Use stainless steel shaft seals or add anti-rust coating.
• Dusty environments: Install external filters (10μm filtration精度).
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Ningbo Hengnuo Hydraulic Drive Co.,Ltd
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