K3V112DT-9ND9 Hydraulic Pump for XCMG excavator spare parts

Short Description:

Kawasaki K3V112DT‑9ND9 hydraulic pump is an original negative‑flow controlled double‑variable piston pump specially calibrated for XCMG medium‑tonnage excavator hydraulic system. Matched to the power output characteristics of XCMG host engine, it transfers mechanical rotational energy into high‑pressure hydraulic energy. As the core main pump of the whole hydraulic system, it provides stable dual‑loop oil supply for bucket, boom, arm, swing and travel hydraulic actuators. Optimized for domestic earth‑moving, rock‑breaking and frequent‑switching working conditions, it delivers responsive compound‑action performance and steady output under variable load impact, serving as the decisive power component for XCMG excavator’s reliable operation.

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description

K3V112DT‑9ND9 hydraulic pump belongs to the mature K3‑series main pump platform, equipped with exclusive 9ND9 control valve assembly with revised power‑adjustment curve tailored for XCMG host torque parameters. The dual‑pump independent variable structure can dynamically redistribute flow demand during multi‑action composite operation, lowering ineffective power consumption. Built‑in negative‑flow signal acquisition unit collects real‑time pressure feedback from main valve port to adjust pump displacement, striking a fine balance between digging thrust and operating speed. The pump housing adopts high‑strength cast steel structure, together with high‑hardness valve plate and plunger matching pairs. The sealing assembly is reinforced to adapt to frequent impact and high‑temperature environment of domestic construction sites, restraining progressive internal leakage under long‑period cyclic load. Inferior substitute pumps often come with mismatched power characteristic curve, uncoordinated combined movements and fast wear of internal friction pairs, which will result in weak excavation force, slow boom movement, excessive system heating and reduced continuous‑working efficiency.

product parameters

Brand: Kawasaki (Genuine Original)

Model: K3V112DT‑9ND9

Product Name: Negative‑Flow Controlled Dual‑Piston Main Hydraulic Pump Assembly

Applicable Equipment: XCMG medium‑tonnage excavators and corresponding domestic engineering machinery

Structural Type: Axial variable‑displacement double‑piston pump (negative‑flow control)

Core Structure: 9ND9 dedicated control valve group, negative‑flow signal sensing module, dual‑pump swash‑plate variable mechanism, high‑precision plunger assembly, high‑hardness alloy valve plate, built‑in pressure‑limit valve, multi‑layer reinforced high‑pressure sealing set, integral cast‑steel pump housing

Main Material: High‑strength cast‑steel pump shell, wear‑resistant alloy plunger pair, impact‑resistant thickened valve plate, high‑temperature‑resistant aging‑proof sealing components, precision hydraulic control parts

Core Function: Dual‑loop hydraulic power supply, negative‑flow variable regulation, host power‑curve matching, power output for boom, arm, bucket, swing and travel, maintaining coordinated compound‑action performance of excavator

Working Characteristics: Sensitive flow response, excellent multi‑action coordination, reasonable power distribution, low heat generation, controllable internal leakage, stable pressure output, outstanding anti‑shock performance

Working Condition Adaptation: Adapt to frequently‑changed excavation load, repeated start‑stop, impact load, dusty and high‑temperature open‑air construction‑site environment

Matching Parts: Main control valve assembly, travel & swing hydraulic motor, hydraulic oil tank, return‑line filter, high‑pressure hydraulic hoses, engine flywheel housing connection end

advantages

• Original 9ND9 control valve group adopts customized power‑adjustment curve, perfectly matching XCMG host torque output and reducing power‑mismatch loss.

• Negative‑flow signal feedback mechanism optimizes flow allocation for multi‑joint compound movements, making digging‑and‑travel linkage more smooth.

• Dual‑pump independent variable structure automatically adjusts output flow according to real‑time load, improving fuel‑saving performance under light‑load working conditions.

• Built‑in multi‑stage pressure‑limiting protection quickly releases peak impact pressure and protects internal precision friction pairs against overload damage.

• Hardened internal matching components slow down performance attenuation under long‑time earth‑moving cyclic operation and suppress abnormal system temperature rise.

• Reinforced sealing structure resists hydraulic‑oil aging corrosion and lowers external‑leakage risk under heavy‑vibration working scenarios.

• Standard installation dimension same as original pump, supporting direct on‑site replacement without secondary modification.

maintenance & replacement tips

• Routinely inspect pump housing, sealing surfaces and hose joints for oil seepage triggered by frequent impact vibration during excavation work.

• Replace hydraulic oil and return‑line filter strictly following service cycle, prevent particle pollutants from scratching plunger and valve‑plate friction pairs.

• Observe compound‑action smoothness during operation; troubleshoot insufficient digging force and sluggish movement caused by aging of 9ND9 control valve components.

• Check tightening status of flywheel‑side connecting bolts regularly, avoid abnormal vibration and noise caused by loose installation under repeated start‑stop cycles.

• Avoid long‑term continuous overload excavation to prevent premature fatigue damage of internal variable mechanism and friction pairs.

• Adopt genuine Kawasaki K3V112DT‑9ND9 hydraulic pump when sustained pressure loss, obvious internal wear and large‑area external oil leakage occur.

warehouse

We have built four spare parts warehouses in Xuzhou, Jining, Kunshan and Changsha to provide customers from all over the world with a variety of high-quality spare parts. We can basically ship self-provided spare parts within three days after confirming the order. If the spare parts need to be adjusted or processed, they will be shipped within 7-30 days.