Product Overview
The PV29-2R1D-C02, PV29-2R5D-C01, and PV29-2R1E-C03 are core models of the Parker Hannifin (formerly Denison) PV series open-circuit variable displacement axial piston pumps. The PV29 is the largest displacement model in the series, featuring 61.9 cc/rev displacement, and represents the flagship specification within the PV series lineup (PV6 / PV10 / PV15 / PV20 / PV29).
The PV series hydraulic pumps originate from Denison’s classic design and are now fully manufactured and integrated by Parker. The series features pressure compensator (constant pressure) control as the basic control function, with optional load sensing and power limit controls available. With rugged design and compact construction, these pumps deliver reliable hydraulic power even under severe operating conditions.
The PV29 employs a swashplate-type axial piston design, enabling stepless displacement adjustment through variation of the swashplate angle. The nine-piston rotating group design provides smoother power delivery and quieter operation. The housing is manufactured from high-strength cast iron with precision machining, providing excellent fatigue strength and dimensional stability.
Engineered as a direct OEM-replacement solution, these models fully comply with Parker original design standards and SAE mounting interface specifications, offering 100% direct interchangeability with OEM pumps. Every unit undergoes 100% workload simulation testing prior to shipment, rigorously validating pressure compensator response characteristics, volumetric efficiency, and internal leakage performance to meet or exceed OEM standards.
Model Code Breakdown (Bulleted List) :
PV29-2R1D-C02
PV — Series: Open-circuit axial piston variable pump
29 — Size: 61.9 cc/rev displacement
2 — Control group
R — Rotation: Right-hand (clockwise, viewed from shaft end)
1 — Output shaft: Single output shaft
D — Control type: Pressure Compensator Control
C02 — Specific control setting and pressure level code
PV29-2R5D-C01
PV — Series: Open-circuit axial piston variable pump
29 — Size: 61.9 cc/rev displacement
2 — Control group
R — Rotation: Right-hand (clockwise)
5 — Output shaft configuration code
D — Control type: Pressure Compensator Control
C01 — Specific control setting and pressure level code
PV29-2R1E-C03
PV — Series: Open-circuit axial piston variable pump
29 — Size: 61.9 cc/rev displacement
2 — Control group
R — Rotation: Right-hand (clockwise)
1 — Output shaft: Single output shaft
E — Control type: Power Limiter Control
C03 — Specific control setting and pressure level code
The primary difference among the three models lies in the control type: “D” denotes Pressure Compensator Control (constant pressure control), suitable for systems requiring constant operating pressure; “E” denotes Power Limiter Control, suitable for applications requiring input power limitation to protect the prime mover. The difference between 2R1D and 2R5D lies in the specific output shaft configuration.
Technical Specifications
PV29 Series General Specifications
Series: Parker Denison PV Series Open-Circuit Axial Piston Variable Pump
Displacement: 61.9 cc/rev
Rated Pressure (Continuous): 207 bar (3000 psi)
Rated Pressure (Continuous – Maximum): 275 bar
Peak Pressure (Intermittent): 280 bar (4000 psi)
Peak Pressure (Transient): 300 bar
Maximum Speed: 2000 rpm
Minimum Speed: 300 rpm
Control Type: 2R1D = Pressure Compensator / 2R5D = Pressure Compensator / 2R1E = Power Limiter
Rotation Direction: Right-hand (clockwise, viewed from shaft end)
Output Shaft Type: Single output shaft
Mounting: SAE 4-bolt flange mounting
Interface Standard: VDMA Standard Sheet 24560 Part 1
Number of Pistons: 9
Housing Material: High-strength cast iron
Weight: Approx. 33 kg
Operating Temperature Range: 30℃ to 90℃
Recommended Media: Mineral hydraulic oil and synthetic hydraulic oils
Drain Port Orientation: Must face upward
Compensator Response Time (Off-stroke): 50 ms
Compensator Response Time (On-stroke): 120 ms
Displacement Adjustment: Standard adjustable displacement limiter
Key Technical Advantages
1. Large Displacement with High Power Density
With 61.9 cc/rev displacement, the PV29 is the flagship model in the PV series. At 275 bar rated pressure and 2000 rpm, it delivers ample hydraulic power for heavy-duty equipment.
2. Flexible Control Options
PV29-2R1D-C02 / PV29-2R5D-C01 are equipped with a standard pressure compensator (constant pressure) controller that automatically reduces displacement upon reaching the set pressure, maintaining constant system pressure while minimizing energy losses and system heat generation. Compensator response time: 50 ms off-stroke, 120 ms on-stroke.
PV29-2R1E-C03 features a power limiter control that limits the pump’s absorbed power based on the prime mover’s power output capability, preventing prime mover overload.
Both control types can be flexibly selected based on application requirements.
3. Rugged Cast Iron Housing with Precision Manufacturing
The housing is manufactured from high-strength cast iron with precision machining, providing excellent fatigue strength and dimensional stability. The cast iron material offers superior damping characteristics that effectively absorb vibration and shock loads during operation, extending pump service life.
4. Nine-Piston Design – Low Noise with High Efficiency
The PV series features a nine-piston rotating group design combined with pre-compression technology (Pre-Compression Volume), delivering exceptionally low outlet flow pulsation and outstanding low-noise operation. Optimized swashplate angle and piston kinematics effectively reduce flow pulsation and pressure fluctuation, minimizing system vibration and noise radiation.
5. Full-Power Through-Drive Capability
The PV series hydraulic pumps feature full-power through-drive capability, allowing multiple pumps to be driven by a single prime mover shaft. When used as the primary pump, the PV29 can have additional PV series pumps or gear pumps mounted on its through-drive shaft to form multi-pump assemblies, meeting the multi-circuit oil supply requirements of complex hydraulic systems.
6. Excellent Interchangeability with Standardized Interfaces
Mounting dimensions fully comply with SAE 4-bolt flange mounting standards and VDMA Standard Sheet 24560 Part 1 interface specifications. The pumps are interchangeable with any other piston pumps that meet SAE mounting standards. As a direct OEM-replacement solution for Parker Denison original products, they offer 100% direct interchangeability with OEM pumps—zero modifications required for direct replacement.
7. 100% Factory Tested
Every unit undergoes 100% workload simulation testing prior to shipment, covering pressure compensator response characteristic verification, internal leakage detection, and flow-pressure characteristic curve testing—ensuring every unit meets design performance standards.
Application Areas
The PV29 series axial piston variable pumps are widely used in the hydraulic systems of the following industries and equipment:
Injection Molding Machines: Providing stable, adjustable hydraulic power for precise pressure and flow control during injection, clamping, and other processes
Die Casting Machines: Delivering high-pressure, high-flow hydraulic power for die casting processes
Marine Machinery: Deck machinery, steering gear, windlass, and other marine hydraulic systems
Construction Equipment: Hydraulic systems for excavators, loaders, and other mobile machinery
Metallurgical Equipment: Rolling mills, continuous casting machines, and other heavy industrial equipment
Material Handling Equipment: Forklifts, lifting platforms, and more
Presses and Forging Equipment: Providing precise pressure and speed control
Concrete Mixer Trucks: Reliable hydraulic power for mixing systems
Expert Maintenance Tips
1. Model Confirmation & Selection
PV29-2R1D-C02, PV29-2R5D-C01, and PV29-2R1E-C03 all belong to the PV29 platform but feature different control types. 2R1D and 2R5D feature pressure compensator (constant pressure) control, while 2R1E features power limiter control. Before installation, confirm the correct model based on system control requirements.
2. Rotation Direction Confirmation
The “R” in the model designation indicates right-hand rotation (clockwise, viewed from the shaft end). Before installation, always verify that the prime mover rotation direction matches the pump’s rotation direction—incorrect rotation will result in pump failure to prime and may cause severe damage to internal components within a short period.
3. Installation Precautions
Thoroughly clean the mounting flange (SAE 4-bolt flange) and shaft mating surfaces before installation to ensure no debris remains
Use SAE-specified torque values for mounting bolts—avoid over-tightening which may cause housing distortion
Ensure correct connection of inlet, outlet, and drain ports—the drain port must face upward
PV series from Design Series 44 onward feature three standard drain ports
4. Compensator Adjustment
The standard pressure compensator (D control) set pressure can be adjusted via the adjustment screw
The power limiter (E control) set point must be calibrated based on prime mover power
All PV series axial piston pumps are equipped with an adjustable displacement limiter
Use an accurate pressure gauge for monitoring during adjustment—avoid over-adjustment
Adjustment should be performed by qualified technical personnel following the Parker official service manual (MSG30-3245-INST)
5. First Start-Up and Bleeding
Before first start-up, must fill the pump housing with clean hydraulic oil (ISO VG46 anti-wear hydraulic oil recommended) through the drain or inlet port—never start dry
Do not start the pump when oil temperature is below 18℃
After start-up, jog the prime mover to confirm correct rotation direction, then run at low speed with no load for 2–3 minutes to ensure complete air evacuation from the pump and system
Check for abnormal noise or leakage
6. Fluid and Filtration
Use high-quality anti-wear hydraulic oil compliant with DIN 51524 standards (ISO VG 46 recommended)
Maintain system oil cleanliness to ISO 4406 18/15 or better
The PV series has high cleanliness requirements—install a high-quality filter in the inlet line
Operating temperature should be maintained within 30℃ to 90℃
7. Periodic Maintenance
Check mounting bolt torque every 1,000 operating hours
Regularly monitor system operating pressure to ensure it does not exceed 275 bar rated pressure and 300 bar peak pressure
Regularly check drain port flow—a significant increase in drain flow may indicate increased internal wear
If flow output decreases, response becomes sluggish, noise levels increase abnormally, or system temperature rises excessively, inspect and replace worn components promptly
