K3VL140/B-1BRSM-L0/1-TB176.2 Kawasaki Axial Piston Pump 140cc

Product Overview

The K3VL140/B-1BRSM-L0/1-TB176.2 is the 140 cc-class core model within the Kawasaki Heavy Industries K3VL series of swashplate-type axial piston variable displacement pumps. The K3VL series is an open-circuit hydraulic pump platform developed based on Kawasaki’s K3V series, which has a rich track record in construction machinery pumps. Spanning displacements from 28 to 200 cm³/rev with a rated pressure of 32 MPa (320 bar) and peak pressure of 35 MPa (350 bar), the series employs Kawasaki’s unique mechanism born from long-term research, drastically reducing pressure pulsation — the source of noise generation.

K3VL Series Core Features: Swashplate-type variable displacement axial piston pump for open circuits; load sensing and pressure constant control as fundamental methods, with unload and variable pressure control capabilities; optional horsepower control and electric flow control; high pump efficiency (peak overall efficiency >90%); exceptional self-priming capability; excellent reliability and very long service life; high power-to-weight ratio; quick control response; extensive through-drive options.

Model Code Breakdown (for procurement and engineering reference):

Using K3VL140/B-1BRSM-L0/1-TB176.2 as example:

• K3VL140: K3VL series, nominal size 140, geometric displacement 140 cm³/rev

• /B: Design series code

• 1: Design variant

• BRSM: Configuration code. B = mounting and port configuration code; RS = rotation direction and port position code (R = right-hand/clockwise, S = side port); M = shaft and additional configuration code

• L0: Control type — Load Sensing + Pressure Cut-off, with LS bleed orifice. The L0 controller automatically adjusts pump displacement by sensing the pressure differential (Δp) across a throttle valve for on-demand flow delivery, with integrated maximum pressure cut-off function

• /1: Control valve design number

• TB176.2: Factory calibration code and batch identifier. The specific control parameters (pressure setting, LS differential pressure, etc.) corresponding to TB176.2 are subject to Kawasaki factory calibration

L0 Control Function Details:

The L0 controller is a standard regulator configuration in the K3VL series, integrating load sensing control and pressure cut-off functions into a single unit. The load sensing spool automatically adjusts pump displacement by sensing the pressure differential (Δp) across the system throttle valve, enabling the pump to deliver only the flow actually required by the actuators while maintaining constant throttle pressure drop. When system pressure reaches the maximum pressure compensator setting, the pump automatically switches to constant pressure control mode, reducing displacement to maintain the set pressure. The LS bleed orifice ensures stable pressure release during stand-by conditions, suitable for open-circuit hydraulic systems requiring rapid response.

Drop-in Replacement Advantage: Manufactured to exact Kawasaki OEM specifications, this pump achieves complete drop-in interchangeability with the original K3VL series for SAE D 4-bolt mounting flange, 13T 8/16DP splined shaft, SAE J518C standard port layout, and L0 control module interface. Every pump undergoes 100% simulated load testing prior to shipment, validating 32 MPa pressure loading, load sensing response, and volumetric efficiency under conditions replicating real-world duty cycles.

Technical Specifications 

Model K3VL140/B-1BRSM-L0/1-TB176.2:

• Model Code: K3VL140/B-1BRSM-L0/1-TB176.2

• Series: Kawasaki K3VL Series (Open Circuit, Swashplate Design)

• Nominal Size: K3VL140

• Geometric Displacement: 140 cm³/rev (8.54 in³/rev)

• Rated Pressure: 32 MPa (320 bar / 4640 psi)

• Peak Pressure: 35 MPa (350 bar / 5075 psi)

• Maximum Self-Priming Speed: 2200 rpm (inlet absolute pressure ≥ 0.9 bar)

• Maximum Boosted Speed: 2500 rpm (inlet absolute pressure ≥ 1.3 bar)

• Minimum Speed: 600 rpm

• Theoretical Flow at 2200 rpm: Approx. 308 L/min

• Control Type: L0 — Load Sensing + Pressure Cut-off (with LS bleed orifice)

• Pressure Compensator Adjustment Range: Per factory calibration

• LS Differential Pressure Setting Range: Per factory calibration

• Rotation: Right-hand (clockwise, viewed from shaft end)

• Mounting Flange: SAE D 4-bolt flange

• Shaft: 13T 8/16DP splined shaft

• Main Ports: Inlet SAE J518C – 2-1/2″; Outlet SAE J518C – 1-1/4″

• Housing Material: High-strength cast iron

• Seal Material: NBR (nitrile rubber), shaft seal Viton

• Working Fluid: Mineral oil, polyol ester, water glycol (anti-wear mineral hydraulic oil required when pressure exceeds 206 bar)

• Viscosity Range: 15–100 cSt

• Operating Temperature: -20°C to +90°C

• Fluid Cleanliness: ISO 4406 18/15/12 or better

• Weight: Approx. 65 kg

K3VL Series Displacement Size Reference:

• K3VL28: 28 cm³/rev, rated 32 MPa, peak 35 MPa, max self-priming speed 2600 rpm, weight approx. 20 kg

• K3VL45: 45 cm³/rev, rated 32 MPa, peak 35 MPa, max self-priming speed 2700 rpm, weight approx. 25 kg

• K3VL80: 80 cm³/rev, rated 32 MPa, peak 35 MPa, max self-priming speed 2400 rpm, weight approx. 35 kg

• K3VL112: 112 cm³/rev, rated 32 MPa, peak 35 MPa, max self-priming speed 2200 rpm, weight approx. 65 kg

• K3VL140: 140 cm³/rev, rated 32 MPa, peak 35 MPa, max self-priming speed 2200 rpm, weight approx. 65 kg

• K3VL200: 200 cm³/rev, rated 32 MPa, peak 35 MPa, max self-priming speed 1900 rpm, weight approx. 95 kg

• K3VL200H: 200 cm³/rev (with impeller), rated 32 MPa, peak 35 MPa, max self-priming speed 2200 rpm, weight approx. 130 kg

Note: Data compiled from Kawasaki Heavy Industries official product specification pages. The entire K3VL series has a maximum peak pressure of 35 MPa, with SAE D 4-bolt mounting flange and 13T 8/16DP splined shaft configuration.

Key Technical Advantages

1. Kawasaki’s Unique Low-Pulsation Mechanism with Low Noise Operation
The K3VL series employs Kawasaki’s unique mechanism born from long-term research, drastically reducing pressure pulsation — the source of noise generation. This design fundamentally suppresses pressure fluctuations during hydraulic pump operation, enabling the K3VL series to maintain low noise operation across the entire pressure range. Metering slot pre-compression and pre-decompression angles are precisely calculated to minimize pressure spikes and flow pulsation during piston chamber high-to-low pressure transitions. The K3VL140 features a 9-piston structure, delivering smoother output flow with less pressure pulsation compared to conventional piston pump designs.

2. L0 Load Sensing Control with On-Demand Flow
The K3VL140/B-1BRSM-L0/1-TB176.2 is equipped with the L0 load sensing control module. The L0 controller integrates the load sensing spool and maximum pressure compensator into a single unit, automatically adjusting pump displacement by sensing the pressure differential (Δp) across the system throttle valve, enabling the pump to deliver only the flow actually required by the actuators while maintaining constant throttle pressure drop. When system pressure reaches the maximum pressure compensator setting, the pump enters constant pressure control mode. The LS bleed orifice ensures stable pressure release during stand-by conditions. The system delivers only the flow actually required by the actuators, avoiding excess flow being converted to heat through the relief valve for significant energy savings under variable load conditions. The L0 control method is particularly suitable for construction machinery and industrial hydraulic systems requiring precise flow control.

3. High Pump Efficiency with Exceptional Self-Priming Capability
The K3VL series features high pump efficiency, with peak overall efficiency exceeding 90%. High volumetric efficiency means less internal heat generation and more consistent power delivery, effectively reducing energy consumption and improving system performance. The K3VL140 achieves a maximum self-priming speed of 2200 rpm at an inlet absolute pressure of 0.9 bar or above, and a maximum boosted speed of 2500 rpm at an inlet absolute pressure of 1.3 bar or above. Stable oil suction is achievable without an auxiliary pump, effectively reducing system complexity and installation costs while minimizing cavitation and aeration risk.

4. High-Strength Cast-Iron Housing with Precision Rotary Group
The pump body is precision-cast from high-strength cast iron, with the material’s damping characteristics effectively suppressing structural vibration and fluid-borne noise. The critical friction pairs of the K3VL series (such as piston/cylinder, shoe/swashplate, cylinder/valve plate) are well-designed and made of durable materials, ensuring long service life and reliability. The internal rotating groups are based on the proven design of the K3V series, with bearings selected through system-level load analysis for long-term stable operation at 32 MPa continuous pressure.

5. Extensive Control Options with Modular Expansion
The K3VL series is based on load sensing and pressure constant control as fundamental methods, with unload and variable pressure control capabilities. Optional specifications include horsepower control and electric flow control. Control options include: L0 (load sensing + pressure cut-off), L1, P0 (pressure compensator), P1, and low/medium/high torque limiter specifications. Modular control designs enable field conversion and upgrade. The series also offers extensive through-drive options (SAE A, B, BB, C, etc.), supporting single-drive multi-pump compound hydraulic systems.

6. Wide Hydraulic Fluid Compatibility with SAE Standard Mounting Interface
The K3VL series is compatible with multiple hydraulic fluids: mineral oil, polyol ester, and water glycol. When pressure exceeds 206 bar, high-quality anti-wear mineral hydraulic oil must be used. Recommended viscosity range is 15–100 cSt. The mounting interface uses SAE D 4-bolt flange and 13T 8/16DP splined shaft, with main ports using SAE J518C standard flange connections (inlet 2-1/2″, outlet 1-1/4″), providing high standardization that requires no adaptation for replacement.

Application Areas

• Excavators: Medium to large excavator main hydraulic pumps (one of the core application areas for the K3VL series)

• Wheel Loaders: Wheel loader work equipment and travel hydraulic systems

• Rotary Drilling Rigs: Main hydraulic systems for high-torque drilling operations

• Concrete Pump Trucks: Main hydraulic pumps for pumping systems

• Port Machinery: Reach stackers, container handler hydraulic systems

• Injection Molding Machines: Clamp and injection hydraulic systems

• Marine & Offshore: Ship deck machinery hydraulic drives, marine winch hydraulic systems

• Industrial Hydraulic Power Units: Medium-high pressure industrial hydraulic power units, central oil supply systems

Expert Maintenance Tips

1. Hydraulic Fluid Cleanliness
The K3VL140 series L0 control spool operates with extremely tight clearances and is highly sensitive to particulate contamination. System fluid cleanliness must meet ISO 4406 18/15/12 or better. Recommended fluids are ISO VG32 or VG46 anti-wear hydraulic oils (mineral oil). Install a 10 μm absolute-rated filter element at the pump inlet. Replace elements at 500 hours after first commissioning, then every 1,000 operating hours or 6 months, whichever comes first. Contamination control is the primary condition for ensuring long-term stable L0 controller operation.

2. Pre-Start Pump Housing Priming (Mandatory)
Before starting the pump, the pump casing must be filled with clean hydraulic oil through the drain port — filling only the suction line with oil is totally insufficient. The pump contains bearings and high-speed sliding parts including pistons with shoes and spherical bushes that need to be continuously lubricated. Part seizure or total premature failure will occur very quickly if this procedure is not rigidly followed.

3. L0 Controller Commissioning and Differential Pressure Setting
The L0 controller pressure compensator setting and LS differential pressure setting should be calibrated according to actual system requirements. Set the pressure 15–20 bar above the maximum working load pressure, never exceeding the 32 MPa rated pressure. The LS differential pressure setting must be matched to system throttle valve characteristics. Adjust only with the system at zero load. Rotate the adjustment screw slowly and verify stable pressure gauge readings before proceeding. Note: The pressure controller is not a safeguard against pressure overload — a pressure relief valve must be installed in the system.

4. Case Drain Line Requirements
The case drain line must return directly to the reservoir. Maximum permissible back pressure is 0.2 MPa. The drain outlet must terminate below oil level at all times to prevent air ingestion. The drain line diameter must not be smaller than the pump case drain port size. For K3VL140 class large displacement pumps, case drain flow is substantial — drain line design must fully account for flow demand to avoid excessive case pressure from pipe resistance.

5. Installation Alignment and Plumbing
Ensure drive shaft alignment during installation, employing a flexible coupling. Apply appropriate grease to the spline connection to prevent fretting wear. The suction line diameter must not be smaller than the pump suction port diameter (SAE J518C – 2-1/2″) to avoid excessive suction resistance causing cavitation. Inlet absolute pressure must be maintained at 0.9 bar or above (self-priming condition) or 1.3 bar or above (boosted condition). The tightening torque of the SAE D 4-bolt mounting flange should conform to Kawasaki technical specifications.

6. Hydraulic Fluid Replacement Interval and System Flushing
Replace hydraulic fluid every 1,000–3,000 operating hours or every 6 months, whichever comes first. Recommended fluids are ISO VG32 or VG46 anti-wear hydraulic oils. When changing hydraulic fluid, simultaneously replace filter elements and flush the system to ensure no residual contaminants remain. Flushing should be performed using an off-line filtration system, with filter elements replaced after flushing. Monitor oil temperature during operation, ensuring it does not exceed 90°C.