KYB PSVL-42CG-20 Hydraulic Main Pump – Genuine Japanese for CAT303 / CAT303.5 / Kubota KX121

Description

Detail Information

1. Key Features & Benefits

• Genuine KYB Japan hydraulic pump – Model PSVL-42CG-20. Manufactured by KYB Corporation (formerly Kayaba), a world-renowned Japanese hydraulic specialist and OEM supplier to leading excavator manufacturers including Caterpillar, Kubota, Yanmar, and Hitachi. This is a brand‑new, factory‑fresh unit – not remanufactured, not a generic substitute.

• Engineered for 3–4 ton class mini excavators – Designed specifically for Caterpillar 303, 303.5 CR, 303.5D, 303E CR, Kubota KX121-3, KX121, U35, as well as Bobcat E26/E32/E35 and other 3–4 ton class compact excavators.The PSVL-42CG-20 is the hydraulic main pump that powers the boom, arm, bucket, swing, and travel circuits, delivering precise, responsive hydraulic flow matched to mini excavator duty cycles.

• PSVL series – KYB’s proven compact excavator platform – The PSVL series features a swash plate axial piston design for open circuit hydraulic drive systems.With a maximum displacement of 42.0 cm³/rev and a rated input speed of 2,500 rpm, the PSVL-42CG-20 delivers the power density needed for 3–4 ton class machines.The PSVL-42 is the current generation product, with the PSVL-50 (50 cm³/rev) introduced as its successor for the 3–4 ton market.

• High-pressure capability for mini excavator work – Rated pressure of 24.5 MPa (≈3,550 psi) with peak pressure capability up to 30 MPa or higher for short-term high-pressure tolerance.Maximum input speed of 2,500 rpm. This pressure and speed capability deliver consistent digging force, swing torque, and attachment power in the tight spaces and variable loads that define mini excavator work.

• Compact, lightweight design for mini excavators – Weighing approximately 22–50 kg depending on configuration, the PSVL-42CG-20 is designed to fit into the tight engine compartments of 3–4 ton class mini excavators.Its relatively small size yet high output power make it ideal for excavator hydraulic systems with limited space.

• Low noise and excellent suction performance – Features卓越的吸油性能和低噪音运行, making it ideal for residential and urban job sites where noise restrictions apply.The PSVL series is designed to reduce overall height and weight while maintaining high efficiency.

• Advanced control options – Supports load sensing (LS) control with LS gain change control as a standard function, allowing the pump to automatically adjust displacement according to load.Also features hydraulic pilot horsepower control shift and electromagnetic proportional horsepower control shift options.The pump responds to mechanical, hydraulic, or electrical input signals, delivering smooth, predictable machine response – critical for precision grading and trenching near utilities.

• Modular design for easy maintenance – The PSVL series features a modular design that improves maintenance convenience and ensures a long service life, making it an ideal choice for high-performance hydraulic applications.The pump also includes a swashplate angle indicator for real‑time monitoring of pump operating status.

• Integrated pilot pump – The PSVL-42CG is equipped with a built‑in pilot pump with a displacement of 4.0 or 7.0 cm³/rev and a maximum pilot pressure of 4.9 MPa, eliminating the need for a separate external pilot pump.

• Direct bolt‑on replacement – Mounting flange and hydraulic port configurations match the original KYB PSVL-42CG-20 specifications exactly. The pump features an SAE 1 1/2 suction port (port diameter φ38) and G3/4 discharge port.No modifications, no adapters – your mechanic unbolts the old pump and bolts this one in.

• Replaces multiple OEM part numbers – Compatible with and replaces OEM part numbers 284-8038, 416-5057, and BCT-7025227, reducing maintenance costs and simplifying parts sourcing.

• Pre‑shipment visual verification – Before packing, we send you detailed high‑resolution photographs of the actual unit (mounting flange, splines, port threads, castings, overall condition). You approve shipment – we never ship blind.

• Fast delivery – 5–8 working days lead time from our Guangzhou warehouse. Monthly supply capacity of 300 units, available for single‑piece or bulk orders.

2. Applications

The genuine KYB PSVL-42CG-20 hydraulic main pump is the power source for CAT303, CAT303.5, Kubota KX121, and 3–4 ton class mini excavators used across a wide range of job sites:

• Urban construction & utilities – Sidewalk repairs, water and gas line trenching, fibre‑optic cable installation, and small‑scale demolition in tight access spaces. The pump’s compact design, low noise operation, and precise flow control are essential for working near existing structures and utilities. The LS control system provides “fine‑touch” flow for delicate digging while delivering enough power for breaking compacted surfaces.

• Residential landscaping & pool excavation – Pool digs, retaining walls, grading, and drainage work. The pump’s smooth response, quiet operation, and variable displacement control minimise disturbance to nearby homes, while the high-pressure capability provides the power needed for attachments like augers and trenchers.

• Agriculture & land management – Drainage ditch cleaning, irrigation trenching, pond maintenance, and fence post holes. The pump’s rated pressure of 24.5 MPa (peak 30 MPa) provides the attachment power needed for rippers and post-hole augers, while the LS gain change control adapts to changing load conditions, improving efficiency and reducing fuel consumption in long‑duration agricultural work.

• Equipment rental fleet – Mini excavators are the most frequently rented machines. A genuine new pump provides predictable service life and eliminates the gamble of remanufactured or used units – avoiding costly mid‑rental failures, towing bills, and customer complaints.

• Forestry & vegetation clearance – Steep slopes, fallen timber, and uneven terrain demand reliable hydraulic performance. The integral LS control system prevents engine stall under sudden load spikes, maintaining consistent power for saws, grapples, and mulchers.

• Road & bridge maintenance – Shoulder repairs, guardrail replacement, and drainage cleaning. The pump’s responsive control allows operators to position attachments precisely for roadside work, even in tight work zones with limited space.

3. FAQ – Frequently Asked Questions

Q1: Is this pump an exact replacement for my CAT303, CAT303.5, or Kubota KX121?
A: Yes. The PSVL-42CG-20 is the genuine KYB hydraulic main pump for Caterpillar 303, 303.5 CR, 303.5D, 303E CR, Kubota KX121-3, KX121, U35, as well as Bobcat E26, E32, and E35.It also replaces OEM part numbers 284-8038, 416-5057, and BCT-7025227.To confirm compatibility for your specific machine variant, send us your machine serial number and a photo of the old pump nameplate – we will verify within 2 hours.

Q2: Is this a new pump or a remanufactured unit?
A: It is brand new / genuine original, not remanufactured. All internal components are new. The pump is manufactured by KYB Corporation to original specifications and meets all OEM performance standards. KYB is one of the world’s leading suppliers of hydraulic pumps for mini excavators.

Q3: What are the key specifications of this pump?
A: The PSVL-42CG-20 is a swash plate axial piston pump with a maximum displacement of 42.0 cm³/rev, a rated pressure of 24.5 MPa (≈3,550 psi), a peak pressure of 30 MPa or higher, and a maximum input speed of 2,500 rpm.It features an integrated pilot pump (4.0 or 7.0 cm³/rev), LS gain change control, and hydraulic or electromagnetic proportional horsepower control shift options.The pump weighs approximately 22–50 kg depending on configuration.

Q4: What is the warranty on this pump?
A: Warranty period is 3 to 6 months depending on product details. We do not provide warranty service for genuine original parts. Our value is delivered up front: genuine KYB Japan components, new‑condition pump, and pre‑shipment visual verification. For customers who require a warranty‑covered option, we can quote aftermarket alternatives – ask our sales team.

Q5: How long does delivery take?
A: Delivery is 5–8 working days after order confirmation from our Guangzhou warehouse. Express shipping (DHL/FedEx/UPS) is available for urgent orders.

Q6: What payment methods do you accept?
A: We accept L/C, T/T, XTransfer, PayPal, and Western Union.

Q7: How can I verify the pump is genuine before shipping?
A: Before packing, we send you clear, high‑resolution photographs of the actual unit – mounting flange, splines, port threads, casting marks, and overall condition. You approve shipment only after reviewing these images. We never ship blind.

Q8: What oil should I use with this pump?
A: Use a mineral oil‑based anti‑wear hydraulic fluid as recommended by KYB. Proper hydraulic fluid contamination control is essential to prevent premature wear and extend the pump’s working life. Always refer to your machine operator’s manual for the correct viscosity and specification.

Q9: What is the LS gain change control feature?
A: LS gain change control is a standard feature of the PSVL series that adjusts the LS control differential pressure according to input speed.As engine speed decreases, the LS control flow also decreases, providing a wider range of lever operation vs. working speed correlation – giving the operator more precise control at low engine speeds.

Q10: What mounting configurations are available?
A: The PSVL-42CG features a pilot bore diameter of 101.6 mm, a port pitch of 180.0 mm, and a port hole diameter of 14.0 mm.The suction port is SAE 1 1/2 (port diameter φ38) and the discharge port is G3/4.Multiple mounting interfaces (e.g., SAE flanges) are supported for seamless integration.

Still have questions? Contact Hongtengda Parts – we reply within 24 hours.