Product Overview
The P2105R00C1C25LA20N00A1A4U is the 105 cc-class core model within the Parker Hannifin P2 series of high pressure/high speed axial piston variable displacement pumps. The P2 series is Parker’s flagship platform in mobile hydraulics, spanning displacements from 60 to 145 cm³/rev with rated pressures of 320–350 bar, specifically engineered for open-circuit mobile hydraulic systems.
The P2 series employs a swashplate design featuring a very compact design, low noise level, and low pressure ripple. The series is renowned for high self-priming speed, compact design, high power density, and ease of installation, carrying Heavy Duty approval for sizes 105 and 145. The P2105 achieves a self-priming speed of 2300 rpm at 105 cm³/rev, maximum flow of 231 L/min, maximum power of 138 kW, and weight of approximately 63 kg.
P2 Series Core Features: Swashplate variable displacement piston pump for open-circuit hydraulic systems; compact lightweight design; low noise level and low pressure ripple; integrated pre-compression volume (Ripple Chamber) reducing flow pulsation by 40–60% and significantly lowering system noise; high self-priming speed; sealed shaft bearing; through-drive options; multiple control options (Pressure Compensator PA, Load Sensing LA/LB, Torque Limiting TA/TB/TC/TD); cast iron housing.
Model Code Breakdown (for procurement and engineering reference):
Using P2105R00C1C25LA20N00A1A4U as example:
P2105: P2 series, nominal size 105, geometric displacement 105 cm³/rev (6.41 in³/rev)
R: Rotation direction, right-hand (clockwise, viewed from shaft end)
00: Torque control setting code (00 = for non-torque control pumps)
C1: Shaft option code
C25: Mounting flange and port configuration code
LA: Control type — Load Sensing (2 spool)/Pmax without bleed orifice
20: Pressure compensator setting code (200 bar). The pressure compensator control is factory set per the model code; the setting is coded in tens of bar, so for example 320 bar setting is specified by code 32
N00: Additional control configuration code
A1A4U: Port location and seal configuration code
LA Control Function Details:
LA is a load sensing control with a two-spool design. The top spool is the load sensing spool, while the bottom spool functions as the maximum pressure compensator control. When system pressure reaches the maximum pressure compensator setting, the pump pistons will reduce stroke and maintain that pressure. The standard differential pressure (top spool) setting is 20 bar, adjustable between 10–35 bar to match the required response characteristics and flow through the throttle valve. LA control has no bleed orifice, suitable for systems where the load sensing valve connects the load sensing signal to the tank in neutral position.
Drop-in Replacement Advantage: Manufactured to exact Parker OEM specifications, this pump achieves complete drop-in interchangeability with the original P2 series for SAE C two-bolt or four-bolt mounting flange, ANSI B92.1 splined shaft, SAE standard port layout, and LA control module interface. Every pump undergoes 100% simulated load testing prior to shipment, validating 350 bar pressure loading, load sensing response, and volumetric efficiency under conditions replicating real-world duty cycles.
Technical Specifications
Model P2105R00C1C25LA20N00A1A4U:
Model Code: P2105R00C1C25LA20N00A1A4U
Series: Parker P2 Series (Open Circuit, Swashplate Design)
Nominal Size: P2105
Geometric Displacement: 105 cm³/rev (6.41 in³/rev)
Rated Pressure: 350 bar (5075 psi)
Maximum Operating Pressure: 320 bar (4600 psi)
Self-Priming Speed (at 1 bar absolute inlet pressure): 2300 rpm
Minimum Inlet Absolute Pressure: 0.8 bar
Maximum Inlet Absolute Pressure: 10 bar
Maximum Case Drain Pressure: 1.5 bar (absolute)
Maximum Flow: 231 L/min (61 GPM)
Maximum Input Power: 138 kW (185 HP)
Maximum Torque: 594 N·m
Mass Moment of Inertia (at axis of shaft): 0.0168 kg·m²
Control Type: LA — Load Sensing (2 spool)/Pmax without bleed orifice
Pressure Compensator Adjustment Range: 100–350 bar (sizes 105/145)
LS Differential Pressure Setting Range: 10–35 bar (standard 20 bar)
Rotation: Right-hand (clockwise, viewed from shaft end)
Mounting Flange: SAE C 2-bolt or 4-bolt flange
Shaft: SAE CC keyed or splined shaft
Port Connections: Inlet 1-1/2″-13 UN; Outlet 1-1/2″-13 UN; Drain 1-1/16″-12 O-ring SAE 12
Housing Material: High-strength cast iron
Seal Material: NBR (nitrile rubber), single shaft seal
Working Fluid: Mineral oil (HLP), biodegradable hydraulic oil, synthetic hydraulic oil, water-based fire-resistant fluid (HFC)
Recommended Viscosity: 15–40 mm²/s (normal), 10 mm²/s (short-term min.), 1000 mm²/s (short-term max.)
Fluid Cleanliness: ISO 4406 21/18/14 or better
Operating Temperature Range: -40°C to +90°C (NBR seals)
Weight (with load sense control): 63 kg
P2 Series Displacement Size Reference:
P2060: 60 cm³/rev, rated 320 bar, self-priming speed 2800 rpm, max flow 159 L/min, max power 72 kW, weight 37 kg, noise 74 dB(A)
P2075: 75 cm³/rev, rated 320 bar, self-priming speed 2500 rpm, max flow 182 L/min, max power 108 kW, weight 44 kg, noise 76 dB(A)
P2105: 105 cm³/rev, rated 350 bar, self-priming speed 2300 rpm, max flow 231 L/min, max power 138 kW, weight 63 kg, noise 78 dB(A)
P2145: 145 cm³/rev, rated 350 bar, self-priming speed 2200 rpm, max flow 295 L/min, max power 179 kW, weight 78 kg, noise 80 dB(A)
P3 Series Displacement Size Reference:
P3105: 105 cm³/rev, rated 350 bar, self-priming speed 2600 rpm, max flow 253.6 L/min, weight 62 kg, noise 78 dB(A)
P3145: 145 cm³/rev, rated 350 bar, self-priming speed 2500 rpm, max flow 295 L/min, weight 76 kg, noise 80 dB(A)
Key Technical Advantages
1. LA Load Sensing Control with On-Demand Flow
The P2105R00C1C25LA20N00A1A4U is equipped with the LA load sensing control module. LA control employs a two-spool design — the top spool is the load sensing spool, while the bottom spool functions as the maximum pressure compensator control. The controller acts to stroke the pump to full flow, unless the system throttle valve restricts output flow or the load pressure reaches the maximum pressure limiter setting. If pump flow is restricted by a system valve, the pump will provide only the required flow, with pressure approximately 20 bar above actual load pressure. The load sensing spring standard setting is 20 bar, adjustable between 10–35 bar. 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. LA control has no bleed orifice, suitable for systems where the load sensing valve connects the load sensing signal to the tank in neutral position.
2. Ripple Chamber Pre-Compression Volume with Low Noise Operation
The P2 series incorporates Parker’s proprietary Ripple Chamber technology with integrated pre-compression volume, effectively reducing flow pulsation and pressure pulsation by 40–60% and significantly lowering system noise without additional components or cost. The P2105 achieves a noise level of 78 dB(A) at full flow at 1800 rpm and 250 bar. This design reduces vibration and noise in the hydraulic system, providing a more comfortable working environment for operators while reducing pipe fatigue and leakage risk.
3. High Self-Priming Speed with Excellent Suction Characteristics
The P2 series features high self-priming speed, with the P2105 achieving self-priming speed of 2300 rpm at 1 bar absolute inlet pressure, enabling stable oil suction without an auxiliary pump. Minimum inlet absolute pressure is 0.8 bar, maximum inlet absolute pressure is 10 bar, accommodating various reservoir layouts and installation heights. This characteristic effectively reduces system complexity and installation costs while minimizing cavitation and aeration risk.
4. High Power Density with Compact Lightweight Design
The P2 series employs a swashplate axial piston rotary group design. The P2105 delivers maximum flow of 231 L/min, maximum power of 138 kW, and maximum torque of 594 N·m at 105 cm³/rev, achieving a power density of approximately 2.2 kW/kg, leading its displacement class. The compact structural design enables the P2 series to deliver high flow output while maintaining a small installation envelope, particularly suitable for cost-effective installation within the limited space available on modern mobile machines. The envelope is optimized and the unique port layout ensures fast and cost-saving mounting.
5. High-Strength Cast-Iron Housing with Wide Hydraulic Fluid Compatibility
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 P2 series is compatible with multiple hydraulic fluids: mineral oil (HLP), biodegradable hydraulic oil, synthetic hydraulic oil, and water-based fire-resistant fluid (HFC). When using water-based fire-resistant fluid, system maximum pressure is reduced to 210 bar and bearing life is approximately 25% of mineral oil. Recommended viscosity range is 15–40 mm²/s (normal), 10 mm²/s (short-term minimum), 1000 mm²/s (short-term maximum). The seal material is NBR (nitrile rubber) with single shaft seal configuration, with an operating temperature range of -40°C to +90°C.
6. Through Drive and Modular System Expansion
The P2 series supports through drive, allowing direct mounting of subsequent pumps of same or smaller size on the rear of the main pump for single-drive multi-pump compound hydraulic systems. P2105/P3105 through-drive maximum torque is 650 N·m, meeting the power distribution requirements of diverse compound hydraulic systems. Modular control designs enable field conversion and upgrade, with standardized SAE C two-bolt or four-bolt mounting flange and shaft requiring no adaptation for replacement, significantly reducing equipment downtime. The P2 series offers single pump or multi-pump configuration options.
Application Areas
Forestry: Feller bunchers, knuckle boom loaders, skidders, forwarders
Construction: Wheel loaders, dozers, off-highway trucks
Mining: Drill rigs, loaders
Material Handling: Truck mounted cranes, lift trucks, reachstackers
Recycling: Shredders, balers, compactors
Agricultural Machinery: High-horsepower tractors, combine harvester hydraulic drives
Industrial Hydraulic Power Units: Medium-high pressure hydraulic power units, central oil supply systems
Marine & Offshore: Ship deck machinery hydraulic drives, marine winch hydraulic systems
Expert Maintenance Tips
1. Hydraulic Fluid Cleanliness
The P2 series LA control spool operates with extremely tight clearances and is highly sensitive to particulate contamination. System fluid cleanliness must meet ISO 4406 21/18/14 or better. Recommended fluids are ISO VG32 or VG46 anti-wear hydraulic oils (HLP 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 LA controller operation.
2. LA Load Sensing Controller Commissioning and Differential Pressure Setting
The LA controller has an LS differential pressure setting range of 10–35 bar (standard 20 bar) and a pressure compensator adjustment range of 100–350 bar (sizes 105/145). Set the pressure 15–20 bar above the maximum working load pressure, never exceeding the 350 bar rated pressure. The LS differential pressure setting must be matched to system throttle valve characteristics — for fan-drive systems and systems with motors, the LS setting should be no less than 15 bar to enhance system stability. 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.
3. Case Drain Line Requirements
The case drain line must return directly to the reservoir. Maximum case drain pressure is 1.5 bar absolute. 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 (1-1/16″-12 O-ring SAE 12). Case drain temperature (influenced by pressure and speed) may be up to 20°C higher than reservoir temperature, but the temperature at any part must not exceed the seal material’s permissible range.
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. Water-Based Fire-Resistant Fluid Usage Notes
If the system uses water-based fire-resistant fluid (HFC), confirm seal material compatibility. When using water-based fire-resistant fluid, system maximum pressure is reduced to 210 bar and bearing life is approximately 25% of mineral oil. Consulting Parker technical department for confirmation of suitable configurations is recommended when adopting water-based fire-resistant fluids. When changing hydraulic fluid types, simultaneously check seal material compatibility and perform system flushing and fluid replacement according to Parker technical manual requirements.
6. Installation Alignment and Plumbing
Ensure drive shaft alignment during installation, employing a flexible coupling. Apply appropriate grease to the spline or keyed connection to prevent fretting wear. The suction line diameter must not be smaller than the pump suction port diameter to avoid excessive suction resistance causing cavitation. Inlet absolute pressure must be maintained between 0.8 and 10 bar. The P2 series’ unique port layout design ensures fast and cost-saving mounting; take full advantage of this design advantage during installation.
