RADIAL PISTON PUMP PR4-1X/1,60-250WA01M01

Manufacturer: Bosch Rexroth

Material #: R900331074

Model : PR4-1X/1,60-250WA01M01

***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth PR4-1X/160-250WA01M01 (R900331074) is a high-quality radial piston pump designed for industrial applications in open circuits. This self-priming pump features valve control and boasts a long service life due to its hydrodynamic plain bearings. With a constant displacement design, it is engineered to deliver reliable performance and efficiency. The PR4-1X/160-250WA01M01 has a maximum pressure capacity and can operate at a minimum speed, ensuring versatility across various operational conditions. Its maximum flow rate is tailored to meet the demands of different applications, while the bidirectional rotation adds to its flexibility in system integration. The pump's compact size and bolt face mounting type make it easy to install in space-constrained environments. Equipped with NBR seals, this radial piston pump is compatible with HLP hydraulic fluids, ensuring smooth operation and reduced wear over time. The absence of throughdrive highlights its standalone functionality, and its weight reflects the robustness of its construction without compromising on installation ease. This Bosch Rexroth pump is characterized by its fixed displacement and valve-controlled operation, which ensures consistent fluid delivery under varying conditions. Its design allows for potential combination with other pumps, such as constant and variable vane pumps, providing adaptability for complex hydraulic systems. The product's component series X denotes its updated engineering standards, ensuring compatibility with modern industrial requirements. In summary, the Bosch Rexroth PR4-1X/160-250WA01M01 radial piston pump is an efficient solution for industrial hydraulic systems requiring consistent performance, durability, and ease of maintenance. Its design reflects the precision engineering that customers expect from Bosch Rexroth products.

$2,357.00 USD

More are expected on June 10, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as June 10, 2025 when ordered in

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RADIAL PISTON PUMP PR4-1X/1,60-250WA01M01

Radial piston pump, size 1.6 ccm, pressure 250 bar for industrial applications, open circuit

Small 3-piston pump, self-priming, with valve control. Long service life thanks to hydrodynamic plain bearing

Unpacked Weight: 1.96 kg

Fixed displacement Self-priming, valve-controlled Long service life due to hydro-dynamically lubricated plain bearings Very compact design and installation-friendly dimensions Combination possibility with constant and variable vane pump Five sizes

Assembly

The pumps are valve-controlled, self-priming radial piston pumps with fixed displacement.

They consist essentially of the housing (1), eccentric shaft (2) and pump elements (3), with suction valve (4), pressure valve (5) and piston (6).

Suction and displacement process

Pistons (6) are arranged radially to the eccentric shaft (2). The piston (6) is guided in cylinder (7) and pressed against the eccentric (2) by the spring (8). During the downward movement of piston (6), the working chamber (9) in the cylinder (7) increases in size. The resulting negative pressure lifts the suction valve plate (4.1) from the sealing edge. This opens the connection from the suction chamber (10) to the working chamber (9). The working chamber fills with fluid. During the upward movement of piston (6), the suction valve closes and the pressure valve (5) opens. Fluid can now flow to the system via pressure port (P).

Maximum operating pressure 700 bar

Data Sheet	Download Data Sheet
3D CAD	Download 3D CAD

Max. pressure	250
Shaft end	Cylindrical Ø 14 mm with fitting key
Size	1.6
Speed min.	1000
Productgroup ID	9,10,11,12,13,14
Speed max.	2000
Fastening	4-hole fastening centering 50 mm
Max. flow	3.2
Displacement type	constant
Direction of rotation	counterclockwise and clockwise rotation
Connection diagram	1
Through-drive	without
Weight	1.96
Seals	NBR
Hydraulic fluid	HLP

01		02		03	04	05	06	07	08	09
PR4	–	1X	/		W		01			*

Type
01	Radial piston pump, fixed displacement, maximum pressure 700 bar			PR4
Component series
02	Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions)			1X
Size		NG	Pressure rating
03	Size – pressure stage (maximum) (all sizes have three pistons)	0,40	700 bar	0,40-700
		0,63	700 bar	0,63-700
		1,00	450 bar	1,00-450
		1,60	250 bar	1,60-250
		2,00	175 bar	2,00-175
Direction of rotation
04	Viewed on drive shaft	clockwise and counter-clockwise		W
Drive shaft
05	Parallel keyed shaft			A
	Splined shaft 10 x 12, DIN 5481 (for combination with vane pumps)			G
Line connection
06	Pipe thread according to ISO 228/1			01
Seal material
07	NBR seals			M
	FKM seals			V
Pressure ports
08	1 Pressure port			01
	3 Pressure ports			03
Additional details
09	Further details in the plain text			*

Design options with multi-circuit pumps The following can be seen from the following schematic representations: the number and position of the pressure ports which cylinders are combined. Points mark the cylinders which are directly located at the pressurized pressure port. Circles mark the cylinders which are not directly located at the pressurized pressure port. The dashed and/or dot and dash lines show which cylinders are in each case combined. The pressurized pressure ports are designated in clockwise direction. The pressure port that - in clockwise direction - is closest to the suction port is referred to as P1 .	Type code (Pos. 08)	Number of pressure ports	3 pistons
	01	1
	03	3

Size						0,40	0,63	1,00	1,60	2,00
Displacement	geometric			Vg	cm³	0.4	0.63	1	1.6	2
Drive speed				nmin	rpm	1000	1000	1000	1000	1000
Drive speed				nmax	rpm	3400	3000	2000	2000	2000
Operating pressure	absolute	Inlet		p	bar	0.8 ... 1.5	0.8 ... 1.5	0.8 ... 1.5	0.8 ... 1.5	0.8 ... 1.5
Operating pressure	absolute	Outlet	continuous	pN	bar	700	700	450	250	175
Torque	max.	Drive shaft			Nm	10	10	10	10	10
Weight				m	kg	2.6	2.6	2.6	2.6	2.6
Drive shaft loading						Radial and axial forces cannot be absorbed!	Radial and axial forces cannot be absorbed!	Radial and axial forces cannot be absorbed!	Radial and axial forces cannot be absorbed!	Radial and axial forces cannot be absorbed!
Mounting type						Front face mounting	Front face mounting	Front face mounting	Front face mounting	Front face mounting
Line connections						Screw-in fittings	Screw-in fittings	Screw-in fittings	Screw-in fittings	Screw-in fittings
Direction of rotation, viewed on drive shaft						Counter-clockwise or clockwise, has no influence on the flow direction	Counter-clockwise or clockwise, has no influence on the flow direction	Counter-clockwise or clockwise, has no influence on the flow direction	Counter-clockwise or clockwise, has no influence on the flow direction	Counter-clockwise or clockwise, has no influence on the flow direction
Hydraulic fluid
Permissible hydraulic fluid 1)						Mineral oil (HLP) to DIN 51524-2
Operating temperature range					°C	-10 … +70
Viscosity range					mm²/s	10 … 200
Maximum admissible degree of contamination of the hydraulic fluid 1)						Class 20/18/15 according to ISO 4406 (c)

1)	The cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration prevents faults and simultaneously increases the life cycle of the components. For the selection of the filters, see www.boschrexroth.com/filter.

Flow/drive power 1)
NG	pmax bar	Vg cm3	Pressure	bar	50	100	150	200	250	300	350	400	450	500	550	600	650	700
0,40	700	0.40	qV, eff	l/min	0.55	0.54	0.54	0.53	0.53	0.52	0.51	0.50	0.50	0.49	0.49	0.48	0.48	0.47
0,40	700	0.40	PA	kW	0.07	0.12	0.16	0.20	0.25	0.30	0.34	0.39	0.43	0.48	0.52	0.57	0.61	0.66
0,63	700	0.63	qV, eff	l/min	0.95	0.94	0.93	0.92	0.91	0.90	0.89	0.88	0.88	0.87	0.86	0.85	0.84	0.83
0,63	700	0.63	PA	kW	0.10	0.18	0.26	0.34	0.42	0.51	0.58	0.67	0.74	0.82	0.90	0.98	1.07	1.15
1,00	450	1.00	qV, eff	l/min	1.47	1.45	1.43	1.41	1.40	1.39	1.38	1.37	1.36	–	–	–	–	–
1,00	450	1.00	PA	kW	0.16	0.28	0.41	0.53	0.66	0.77	0.89	1.02	1.14	–	–	–	–	–
1,60	250	1.60	qV, eff	l/min	2.35	2.35	2.34	2.33	2.33	–	–	–	–	–	–	–	–	–
1,60	250	1.60	PA	kW	0.22	0.43	0.64	0.85	1.06	–	–	–	–	–	–	–	–	–
2,00	175	2.00	qV, eff	l/min	2.98	2.97	2.96	–	–	–	–	–	–	–	–	–	–	–
2,00	175	2.00	PA	kW	0.31	0.58	0.86	–	–	–	–	–	–	–	–	–	–	–

1)	Mean values measured at n = 1450 rpm, Θ = 50 °C

For pumps with 3 pressure ports, type “03“ applies the following:

Using various operating pressures for each cylinder the drive power of the highest cylinder pressure is to be selected.

▼ Example: Pump PR4–1X/0.63–700...03

Ports 1 and 2, respectively loaded with 450 bar, 3 is circulating at zero pressure.

PA = 0.74 kW

For applications outside these parameters, please consult us!

Sound pressure level

Note
•	Characteristic curves are mean values, measured at n = 1450 rpm; ν = 41 mm²/s, θ = 50 °C
•	Sound pressure level measured in acoustic room according to DIN 45635, part 26
•	Distance: Microphone – pump = 1 m
•	At a system pressure below 4 bar and a viscosity > 150 mm²/s audible valve noise may occur
•	Sound pressure level at system pressure < 4 bar: ≤ 58 dB(A)

Version with one pressure port

Dimensions in mm

1	Pressure port P
2	Suction port S
3	Woodruff key 5 x 6.5 DIN 6888

Version with three pressure ports

Dimensions in mm

1	Pressure port P
2	Suction port S
3	Woodruff key 5 x 6.5 DIN 6888

Installation instructions

Fluid tank

Adjust useful volume of the tank to the operating conditions. The admissible fluid temperature must not be exceeded; use coolers, if necessary.

Lines and ports

Remove protection plugs from the pump. We recommend the use of seamless precision steel pipes according to DIN EN 10305-1 and removable pipe connections. Select the clear width of pipes according to the ports (suction speed 1 to 1.5 m/s). Inlet pressure, see technical data. Thoroughly clean pipelines and fittings prior to installing.

Proposal for piping layout

Under no circumstances may drain and returning fluid be drawn directly into the suction port again, i.e., select the largest possible distance between suction line and return line. The return drain must always be below the oil level. Ensure suction-tight installation of the pipes.

Filter

Use a return flow or pressure filter, if possible.

(Suction filters only in connection with underpressure switch/clogging indicator).

Hydraulic fluid

Please observe our specifications according to data sheet 90220. We recommend brand name hydraulic fluids. Do not mix hydraulic fluids of different types since this can result in decomposition and deterioration of the lubricity. The hydraulic fluid must be replaced at regular intervals according to the operating conditions. When doing this, the hydraulic fluid reservoir must also be cleaned of residues.

Drive

Electric motor + pump carrier + coupling + pump

No radial or axial forces permissible on the pump drive shaft! Motor and pump must be exactly aligned! Always use a coupling that is suitable for compensating for shaft offsets! When installing the coupling, avoid axial forces, i.e., when installing, do not hammer or press the coupling onto the shaft! Use the female thread on the drive shaft.

Installation positions

Horizontal installation (B3, B5): Always position the suction port over the pressure port. This arrangement supports bleeding of the pump. Vertical installation (V1): No restrictions

B3

B5

V1

Project planning information

When using radial piston pumps, we recommend particularly observing the information specified below. Project planning, assembly and commissioning of the radial piston pumps require the employment of trained experts.

Technical data

All specified characteristic depend on production tolerances and are valid at certain boundary conditions. Please note that consequently, certain scatter ranges are possible and that with changed boundary conditions (e.g. viscosity), the characteristics may also change.

Characteristic curves for flow and consumed power

When designing the drive motor, please observe the maximum application parameters possible.

Noise

The values for sound pressure level shown under Diagrams/characteristic curves have been measured according to DIN 45635 part 26. That means only the sound emission of the pump is shown. Environmental influences (such as place of installation, piping, etc.) have been eliminated. The values are in each case only valid for one pump. For circulation at zero pressure, the pressure line must be preloaded by means of a check valve (cracking pressure p = 5 bar) due to noise development.

Notice

Due to the power unit construction and the influence at the final place of installation of the pump, the sound pressure level will usually be 5 to 10 dB(A) higher than the value of the pump itself.

Commissioning instructions

Air bleeding

All PR4 radial piston pumps are self-priming. Fill the housing with filtered oil via port S. During initial commissioning, set the pump to pressureless circulation. To do so, release the pressure hose and direct it into the reservoir. Before initial commissioning, the pump must be air-bled to protect it against damage. Switch to pressureless circulation, or direct the pressure line or pressure hose back into the reservoir. Briefly switch the pump on (inching mode). Should the pump not displace bubble-free oil after approx. 20 seconds, re-check the system. After the operating values have been reached, check the pipe connections for leakage. Check the operating temperature. Be aware of noise generation.

Commissioning

Check whether the system is thoroughly and properly installed. Start the pump without load and let it displace fluid without pressure for a few seconds in order to ensure sufficient lubrication. In no case may the pump be operated without hydraulic fluid!

Note

Adjustment, maintenance and repair of the pump may only be carried out by authorized, trained and instructed personnel! Use only original Rexroth spare parts! The pump may only be operated within the permissible data. The pump may only be operated when in perfect condition! When carrying out any work on the pump (e.g. installation and removal) the system must be switched off and depressurized! Unauthorized conversions and changes, affecting the safety and function are not permissible! Mount protective devices (e.g., coupling protection)! Do not remove any existing protective devices! The generally valid safety and accident prevention regulations must be strictly observed!