K3V112S Hydraulic Piston pump

K3V112S Hydraulic Piston pump

2 month ago

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 4 year year

Product details

K3V112S Hydraulic Piston Pump

1. Product Overview

K3V112S is Kawasaki single variable displacement swashplate axial piston pump, widely used as the main hydraulic power unit for 12-ton class medium crawler excavators.

Different from tandem double pumps such as K3V112DT / K3V112DTP, this is a single pump structure. The suffix letter S stands for single pump configuration. Multiple regulator options are available including load sensing control and negative flow control. High-quality interchange aftermarket pumps are available as economical replacement solutions for equipment overhaul.

Model Code Explanation

- K3V: Kawasaki open-circuit axial piston pump series

- 112: Theoretical displacement: 112 cc/rev

- S: Single pump construction (single pump unit, non-tandem double pump)

- Extended suffix codes: Define oil port layout, regulator type, shaft spline specification, rotation direction and mounting dimensions

2. Main Technical Parameters

Item Specification

Pump Type Single variable displacement swashplate axial piston pump

Displacement 112 cc/rev

Rated Working Pressure 34.3 MPa

Maximum Peak Pressure 39.2 MPa

Maximum Self-priming Speed 2360 rpm

Volumetric Efficiency ≥92% under rated operating condition

Control Mode Load sensing control / Negative flow control (optional)

Applicable Hydraulic Oil ISO VG46, VG68 anti-wear hydraulic oil

Operating Temperature -20℃ ~ +90℃

Standard Seals NBR; FKM high-temperature sealing kit optional

Approximate Weight 62 kg

3. Working Principle

The engine drives the main shaft and cylinder block assembly to rotate. Pistons reciprocate inside the cylinder block to complete oil suction and high-pressure oil discharge.

The built-in servo piston adjusts the tilt angle of the swashplate automatically according to system load signals, changing pump displacement to regulate output flow.

Load sensing control matches pump output flow with actuator demand, reducing overflow energy loss and fuel consumption during light-load operation.

4. Core Advantages

1. Compact single pump layout, small installation footprint, specially designed for 12-ton excavator limited engine compartment space.

2. High power density, stable high-pressure output, suitable for continuous medium-heavy excavation conditions.

3. Precisely machined internal friction pairs, low internal leakage, stable efficiency under long-hour operation.

4. Optimized flow distribution structure, low vibration and low running noise.

5. Complete interchangeable mounting flange, spline shaft and oil port layout with original Kawasaki pump. Direct replacement without pipeline modification.

6. Mature aftermarket manufacturing, shorter delivery lead time and competitive cost compared with original OEM pumps.

5. Application Range

Main hydraulic main pump for 12-ton crawler excavators

Typical compatible machine models:

Hitachi EX120-2, EX120-3;

Komatsu PC120-6;

Other domestic 12-ton excavators adopting single K3V112S hydraulic system.

6. Common Faults & Replacement Suggestion

Typical failures: Insufficient digging force, slow boom & arm movement, excessive internal leakage, abnormal knocking noise, shaft seal oil leakage.

Thoroughly flush hydraulic pipelines and replace all hydraulic filter elements before installation. Strictly maintain hydraulic oil cleanliness. Replace the whole pump assembly once cylinder block, piston shoes and valve plate suffer severe abrasion.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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Address: Ningbo, China

Main Product: hydraulic motor, gear box , hydraulic pump, hydraulic valve , hydraulic winch, hydraulic system

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