SANY Medium-to-Large Crawler Excavators Proportional Solenoid Valve 1017969

Shandong Shengyue Technology Development Co.,Ltd is one of the most professional sany medium-to-large crawler excavators proportional solenoid valve 1017969 manufacturers and suppliers in China. Please feel free to buy high quality genuine auto parts at competitive price from our factory.

SANY Medium-to-Large Crawler Excavators Proportional Solenoid Valve 1017969

This proportional solenoid valve is compatible with numerous flagship medium, large, and ultra-large excavator models manufactured by Sany.
Medium Excavator Platform: SY215, SY225, SY235.
Medium-to-Large Excavator Platform: SY315, SY325, SY335.
Heavy/Large Excavator Platform: SY365, SY465.

FUNCTION

1. Precise Milliamperage-Level Proportional Current Control (Current-to-Pressure Control): The valve receives a continuously varying control current signal output by the excavator's main controller, ensuring that the displacement of the internal spool is directly proportional to the magnitude of the current. By steplessly modulating the output pressure of the pilot hydraulic fluid, it achieves high-precision fine-tuning of the entire hydraulic system.
2. Main Pump Displacement-to-Engine Power Matching (Power Matching): The pilot control oil pressure output by this valve acts directly upon the variable servo piston of the main hydraulic pump, thereby altering the swashplate angle of the main pump. This ensures that the hydraulic power consumed by the main pump is perfectly matched with the real-time output torque of the diesel engine, effectively preventing engine stalling or flameout under heavy loads.
3. Coordinated Multi-Actuator Operation (Multi-Actuator Coordination): When the operator executes complex combined movements-such as "boom lifting + arm retracting + slewing"-the solenoid valve rapidly adjusts the system control pressure in response to the controller's flow merging and splitting commands. This eliminates abruptness, jerking, or hesitation in individual movements, ensuring smooth and fluid operation.
4. Safe Overflow and Pressure Relief Under Extreme Loads (Overload Protection): When the excavator bucket encounters extreme resistance-such as granite or tree roots-that prevents further digging, causing the system pressure to instantly surge to a critical threshold, the internal mechanical/hydraulic feedback mechanism of the solenoid valve immediately intervenes. It forcibly guides the main pump swashplate back to its neutral position, preventing the main hydraulic system from remaining in a state of excessive high pressure for prolonged periods; this safeguards high-pressure hoses against rupture and minimizes abnormal wear on the main pump and hydraulic motors.

DETAILS

Common Malfunction Symptoms
1. Sluggish Work Equipment Response: When operating the control levers, there is a noticeable delay or sluggishness in boom lifting, bucket curling, or swing movements.
2. Engine Stalling Under Heavy Load: During heavy-duty operations-such as excavating hard soil or rock-the engine may experience a severe drop in RPM or even stall abruptly. This occurs because the solenoid valve fails to timely reduce the main pump's swashplate angle; consequently, the power demand of the main pump exceeds the engine's capacity limit.
3. Lack of High Hydraulic Pressure: The machine feels "weak and lethargic" during operation; the hydraulic system fails to build pressure, preventing the equipment from generating its intended digging force.

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Hot Tags: sany medium-to-large crawler excavators proportional solenoid valve 1017969, manufacturers, suppliers, factory, parts, genuine, original, HOWO SPARE PARTS