K3V63 K3V112 K3V140 K3V180 K3V280DT Hydraulic Pump Excavator Construction Machinery Parts Compatible K5V K5V160 K5V200

The main hydraulic pump is the central power unit that drives the entire hydraulic circuit of an excavator. Driven by the vehicle engine, it transforms mechanical power into high-pressure hydraulic power and delivers pressurized fluid to hydraulic motors, actuating all working motions of the excavator. Axial variable displacement piston pumps are widely adopted on most engineering excavators. Medium and large construction machines are equipped with integrated twin main pumps matched with a rear pilot gear pump assembly. Two separate high-pressure oil delivery lines feed the main control valve to support composite working actions, with a nominal working pressure of 28 to 35MPa. The tail-mounted low-pressure pilot pump operates at a pressure of 3–4MPa with low flow, supplying pilot pressure oil for control levers and main valve spools. Piston assemblies mounted on the cylinder block and pump casing rotate with the main shaft, finishing oil suction and pressure build-up procedures. Altering the swash plate’s tilt angle changes piston stroke length, thus modifying the pump’s displacement capacity. The external servo regulator actuates swash plate movement in response to hydraulic feedback signals. A larger swash plate angle boosts fluid flow and operating speed, while a smaller angle minimizes fuel usage and prevents engine stalling. The valve plate isolates low-pressure inlet and high-pressure outlet channels to complete hydraulic oil distribution work. Three professional control modes ensure stable and efficient pump operation. Constant power control automatically decreases pump displacement as load rises, safeguarding the engine and improving overall power utilization rate. The LS load-sensing system provides on-demand flow and maintains low displacement during idling to achieve fuel economy. The HP pressure limiting function reduces pump displacement at peak pressure values, protecting hydraulic pipes and cylinders from breakage. Frequently encountered faults include internal leakage caused by piston wear, valve plate damage or regulator clogging, resulting in slow operation and power shortage. When the regulator is stuck at maximum displacement, the engine will be overloaded, produce black smoke and stall under heavy working loads. Massive internal leakage converts pressure loss into heat, causing abnormal hydraulic oil overheating. Air suction into the hydraulic system, inadequate oil level, and defective bearings and pistons will cause abnormal operational noise. For effective maintenance, replace hydraulic oil and filters regularly to prevent wear on precision internal parts. Ensure tight sealing of suction pipelines to avoid air intake and machine vibration, and keep hydraulic oil at the prescribed level to guarantee stable pump operation.

Machinery Test Report	Provided	Warranty	3 Months
Video outgoing-inspection	Provided	Brand Name	OEM
Place of Origin	China	Product Name	Hydraulic Pump
Model	K3V Series	MOQ	1 Piece
Quality	High-Quality	Delivery time	7-15 Days
Standard or Nonstandard	Standard	Application	Excavator Machinery
Size	Standard Size	Packing	Wooden Box

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