K3V140DT-9N29 Hydraulic Piston pump

K3V140DT-9N29 Hydraulic Piston pump

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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Product details

K3V140DT-9N29 Hydraulic Piston Pump

1. Product Overview

K3V140DT-9N29 is Kawasaki tandem variable swashplate axial piston pump, specially developed as the original main hydraulic pump for Volvo EC290 / EC290BLC 29-ton excavators.

This twin pump assembly adopts negative flow control structure. Model suffix 9N29 defines oil port layout, regulator assembly, spline shaft specification, rotation direction and installation dimensions.

Aftermarket interchange replacement pumps are available as economical spare parts for equipment overhaul.

Volvo OEM reference numbers: VOE14524052, VOE14531591, VOE14575661

Model Code Explanation

- K3V: Kawasaki open-circuit tandem axial piston pump series

- 140: Theoretical displacement of each single pump: 140 cc/rev

- D: Double tandem pump construction

- T: Tandem arrangement (No PTO power take-off port, distinguish from K3V140DTP)

- 9N29: Special configuration code for Volvo EC290 series, including flange, oil port, control valve and shaft parameters

2. Main Technical Parameters

Item Specification

Pump Type Tandem variable swashplate axial piston pump (without PTO port)

Single pump displacement 140 cc/rev

Rated Working Pressure 34.3 MPa

Maximum Peak Pressure 39.2 MPa

Maximum self-priming speed 2160 rpm

Volumetric Efficiency ≥93% under rated working condition

Control Mode Negative flow control

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 86 kg

3. Working Principle

The engine drives the main shaft and cylinder block assembly to rotate. The reciprocating motion of pistons completes oil suction and high-pressure oil discharge.

The internal servo piston automatically adjusts the tilt angle of the swashplate according to load signals, changing pump displacement to adjust output flow.

Negative flow control optimizes power matching between engine and hydraulic system, effectively reducing power loss and fuel consumption during heavy-load excavation.

4. Core Advantages

1. Standard tandem double pump structure, compact layout, matched perfectly with Volvo EC290 hydraulic system.

2. Heavy-duty cast housing, high power density, stable high-pressure output to adapt continuous heavy excavation operation.

3. Precisely ground internal friction pairs, low internal leakage, long service life.

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

5. Mounting flange, spline shaft and oil port layout fully consistent with original pump, plug-and-play replacement without pipeline modification.

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

5. Application Range

Main hydraulic main pump for 29-ton crawler excavator

Primary compatible machine model:

Volvo EC290, EC290BLC

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 when cylinder block, piston shoes, valve plate and other friction components 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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