PVP3336 PVP3330 Parker Axial Piston Pump 33cc 250bar

Product Overview

The PVP3336C9L21, PVP3336CL21, PVP3336CLM21, PVP3336CR21, PVP3330BR2M21, and PVP330BR2M21 are the 33 cc-class core models within the Parker Hannifin PVP series of medium-pressure open-circuit axial piston variable displacement pumps. The PVP series features a swash plate design for medium-pressure hydraulic systems, with continuous working pressures up to 250 bar (3600 psi) and displacements ranging from 16 to 140 cm³/rev across multiple available sizes.

The PVP series employs a swash plate variable displacement mechanism where piston stroke is determined by swash plate inclination angle, with displacement steplessly adjustable from zero to maximum. The series offers a wide range of standard control options with modular control designs for easy field conversion and upgrade, standard SAE two-bolt mounting flanges and ports, and full power thru-shaft capability for multiple pump installations. The PVP series is renowned for high volumetric efficiency, low noise operation, and precise flow repeatability, widely used in injection molding machines, presses, machine tools, and other industrial hydraulic systems.

Model Code Breakdown (for procurement and engineering reference):

Using PVP3336CL21 as example:

• PVP: Parker PVP series medium-pressure variable axial piston pump

• 33: Nominal size, geometric displacement 33 cm³/rev (2.0 in³/rev)

• 36: Pressure range code, corresponding to continuous pressure 248 bar (3600 psi)

• C: Control type code, pressure compensator control

• L: Rotation direction, counterclockwise (viewed from shaft end)

• 21: Design variant and interface code

Covered Model Configuration Analysis:

• PVP3336C9L21: 33 cc/rev, pressure compensator control, C9 control variant, counterclockwise rotation

• PVP3336CL21: 33 cc/rev, pressure compensator control, counterclockwise rotation, standard configuration

• PVP3336CLM21: 33 cc/rev, pressure compensator control, counterclockwise rotation, M = additional configuration code

• PVP3336CR21: 33 cc/rev, pressure compensator control, clockwise rotation, standard configuration

• PVP3330BR2M21: 33 cc/rev, pressure compensator control, B = control variant, R = clockwise rotation, 2M21 = interface code

• PVP330BR2M21: 33 cc/rev, pressure compensator control, B = control variant, R = clockwise rotation, 2M21 = interface code

Drop-in Replacement Advantage: Manufactured to exact Parker OEM specifications, these pumps achieve complete drop-in interchangeability with the original PVP series for SAE B two-bolt mounting flange, SAE splined shaft (13T or 7/8″ keyed), SAE main port layout, and control module interface. Every pump undergoes 100% simulated load testing prior to shipment, validating 250 bar pressure loading, pressure compensator response, and volumetric efficiency under conditions replicating real-world duty cycles.

Technical Specifications

PVP3336 Series General Specifications:

• Series: Parker PVP Series (Open Circuit, Swash Plate Design)

• Nominal Size: PVP3336

• Geometric Displacement: 33 cm³/rev (2.0 in³/rev)

• Continuous Working Pressure: 250 bar (3600 psi)

• Intermittent Pressure: 320 bar (4600 psi)

• Peak Pressure: 350 bar (5075 psi)

• Maximum Speed: 3000 rpm

• Minimum Speed: 600 rpm

• Theoretical Flow at 1200 rpm: 39.4 L/min

• Theoretical Flow at 1800 rpm: 59.0 L/min

• Input Power at 1800 rpm, 250 bar: 27.2 kW (36.5 HP)

• Control Type: Pressure Compensator Control (standard), with load sensing, horsepower limiting, remote pressure compensation options available

• Pressure Adjustment Range: 15–250 bar

• Mounting Flange: SAE B two-bolt flange

• Shaft: SAE B 13T splined shaft (PVP3330BR2M21) or SAE B 7/8″ keyed shaft (PVP3336R21)

• Port Connections: Inlet SAE-20 straight thread 1-5/8″-12 UN-2B; Outlet SAE-20 straight thread 1-5/8″-12 UN-2B; Case drain 3 × SAE-8 straight thread 3/4″-16UNF 2B

• Housing Material: High-strength cast iron

• Seal Material: NBR (nitrile rubber), suitable for mineral oil-based hydraulic fluid

• Operating Temperature Range: -40°C to +71°C

• Optimum Viscosity Range: 17–180 cSt (max start-up 1000 cSt)

• Fluid Cleanliness: ISO 16/13 – 18/15

• Weight: Approx. 23–27 kg

Model PVP3336C9L21 Configuration:

• Model Code: PVP3336C9L21

• Control Type: Pressure Compensator Control, C9 control variant

• Rotation: Counterclockwise (viewed from shaft end)

• Displacement: 33 cm³/rev

• Continuous Pressure: 250 bar

Model PVP3336CL21 Configuration:

• Model Code: PVP3336CL21

• Control Type: Pressure Compensator Control

• Rotation: Counterclockwise (viewed from shaft end)

• Displacement: 33 cm³/rev

• Continuous Pressure: 250 bar

Model PVP3336CLM21 Configuration:

• Model Code: PVP3336CLM21

• Control Type: Pressure Compensator Control

• Rotation: Counterclockwise (viewed from shaft end)

• Displacement: 33 cm³/rev

• Continuous Pressure: 250 bar

• Additional Configuration: M code for additional functions

Model PVP3336CR21 Configuration:

• Model Code: PVP3336CR21

• Control Type: Pressure Compensator Control

• Rotation: Clockwise (viewed from shaft end)

• Displacement: 33 cm³/rev

• Continuous Pressure: 250 bar

Model PVP3330BR2M21 / PVP330BR2M21 Configuration:

• Model Code: PVP3330BR2M21 / PVP330BR2M21

• Control Type: Pressure Compensator Control (B control variant), with internal remote pressure controls, adjustable max volume stop

• Rotation: Clockwise (viewed from shaft end)

• Displacement: 33 cm³/rev

• Continuous Pressure: 207 bar (3000 psi)

• Intermittent Pressure: 240 bar (3500 psi)

• Maximum Speed: 2400 rpm

• Shaft: SAE B 13T splined shaft

PVP Series Displacement Size Reference:

• PVP16: 16 cm³/rev, max speed 3000 rpm, flow 29.5 L/min @ 1800 rpm, power 13.1 kW

• PVP23: 23 cm³/rev, max speed 3000 rpm, flow 42.0 L/min @ 1800 rpm, power 19.7 kW

• PVP33: 33 cm³/rev, max speed 3000 rpm, flow 59.0 L/min @ 1800 rpm, power 27.2 kW

• PVP41: 41 cm³/rev, max speed 2800 rpm, flow 73.8 L/min @ 1800 rpm, power 33.2 kW

• PVP48: 48 cm³/rev, max speed 2400 rpm, flow 86.4 L/min @ 1800 rpm, power 40.3 kW

• PVP60: 60 cm³/rev, max speed 2200 rpm, continuous pressure 250 bar

• PVP76: 76 cm³/rev, max speed 2000 rpm, continuous pressure 250 bar

• PVP100: 100 cm³/rev, max speed 1800 rpm, continuous pressure 250 bar

• PVP140: 140 cm³/rev, max speed 1600 rpm, continuous pressure 250 bar

Key Technical Advantages

1. Pressure Compensator Control with Constant Pressure Output
The PVP series’ core control method is pressure compensator control. When system pressure reaches the setpoint, the compensator automatically reduces pump displacement, maintaining only leakage compensation flow to keep system pressure constant. The pressure adjustment range is 15–250 bar, precisely settable via the adjustment screw. This control method ensures smooth and precise operation, preventing pressure spikes or drops that could damage system components while effectively reducing system heat generation and power loss.

2. High-Strength Cast-Iron Housing with Low Noise Operation
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 PVP series features optimized piston spacing design, reducing operational noise by approximately 15 dB compared to industry standards, providing a more comfortable working environment for operators. The entire series maintains industry-leading noise levels.

3. Replaceable Bronze Port Plate and Piston Slipper Plate
The PVP series employs a replaceable bronze port plate and piston slipper plate, forming a low-friction pairing with the steel cylinder block end face. Metering slot pre-compression and pre-decompression angles are precisely calculated to minimize pressure spikes and flow pulsation during high-to-low pressure transitions. This design significantly reduces long-term maintenance costs and extends maintenance intervals.

4. Two-Piece Housing and Full Power Thru-Shaft Capability
The PVP series features a two-piece housing construction for easy field service and reduced equipment downtime. Full power thru-shaft capability supports mounting of subsequent pumps of same or smaller size on the rear of the main pump for single-motor multi-pump compound hydraulic systems, supporting up to 100% through-drive power.

5. Flexible Control Options
The PVP series offers a wide range of standard control options: pressure compensation (standard), load sensing, horsepower limiting, horsepower and load sensing, remote pressure compensation, adjustable maximum volume stop, Hi/Lo torque (power) limiting, low pressure standby, and more. Modular control designs enable field conversion and upgrade, meeting the control requirements of different hydraulic systems. Load sensing control achieves on-demand flow delivery for significant energy savings under variable load conditions.

6. Fast Response Times with Wide Hydraulic Fluid Compatibility
The PVP series swash plate variable mechanism features short response times, with control spool and servo piston area ratios and spring rates precisely matched to ensure fast and stable displacement adjustment. Hydraulic fluid compatibility includes mineral oil-based fluids with an optimum viscosity range of 17–180 cSt and an operating temperature range of -40°C to +71°C, suitable for diverse industrial hydraulic applications.

Application Areas

• Plastic Injection Molding Machines: Clamp and injection hydraulic systems (one of the core application areas for the PVP series)

• Pressing Equipment: Hydraulic presses, stamping equipment hydraulic power sources

• Machine Tools: CNC machine hydraulic systems, hydraulic fixtures, precision grinder hydraulic power sources

• Material Handling: Forklift hydraulic systems, lift platform drive circuits

• Industrial Hydraulic Power Units: Small to medium hydraulic power units, central oil supply systems

• Metallurgical Equipment: Rolling mill hydraulic systems, smelting equipment hydraulic power sources

• Marine & Offshore: Ship deck machinery hydraulic drives, steering gear hydraulic systems

Expert Maintenance Tips

1. Hydraulic Fluid Cleanliness
The PVP series pressure compensator spool operates with extremely tight clearances and is highly sensitive to particulate contamination. System fluid cleanliness must meet ISO 16/13 – 18/15 requirements. 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. Recommended fluids are ISO VG32 or VG46 anti-wear hydraulic oils with an optimum viscosity range of 17–180 cSt.

2. Pressure Compensator Setting and Adjustment
Set the pressure compensator 15–20 bar above the maximum working load pressure, never exceeding the 250 bar continuous working pressure. Adjust only with the system at zero load. Rotate the adjustment screw slowly and verify stable pressure gauge readings before proceeding. For models equipped with internal remote pressure controls (such as PVP3330BR2M21), confirm the remote control piping is correctly connected and the adjustment range meets system requirements. The pressure compensator is not a safeguard against pressure overload — a pressure relief valve must be installed in the system.

3. Case Drain Line Requirements
The case drain line must return directly to the reservoir. Maximum permissible back pressure is 2 bar (0.2 MPa). The PVP series is equipped with 3 case drain ports (SAE-8 straight thread 3/4″-16UNF 2B) for different mounting orientations. 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 “shaft-up” vertical mounting positions, filling and air bleeding must be performed completely.

4. Pre-Start Priming and Air Bleeding
Before first start, fill the pump housing with clean hydraulic fluid through the case drain port. After installation, turn the drive shaft by hand several revolutions to confirm free rotation without binding. Position the control at neutral (zero displacement) and run at low speed for 5–10 minutes. Verify continuous bubble-free flow from the case drain. Only then apply load.

5. Splined Shaft and Coupling Maintenance
The PVP3330BR2M21 uses an SAE B 13T splined shaft, and the PVP3336R21 uses an SAE B 7/8″ keyed shaft. Ensure drive shaft alignment during installation, employing a flexible coupling. Apply appropriate grease to the spline connection to prevent fretting wear. Inspect coupling alignment and spline wear at 500 hours after first commissioning, then recheck every 2,000 operating hours.

6. Through Drive End Maintenance
If equipped with through drive, regularly inspect rear pump mounting bolt tightness and spline connection wear. The through-drive end bearing is lubricated by the pump’s internal case drain circuit — no additional maintenance required. However, the rear pump’s power demand must not exceed the through-drive rated torque capacity (100% through drive). Inspect through-drive end bolt torque at 500 hours after first commissioning, then recheck every 2,000 operating hours.