Rexroth A2F5 Small fixed displacement hydraulic motor

SERIES : A2FM

BRAND : For Bosch Rexroth

Model Size :A2F5

Displacement : 5cm3/rev

Speed : 8000rpm

Maximum Pressure : 450bar

Nominal Pressure : 400bar

Download PDF

For more new products, please call us or email us

Product Details
Product Model
FAQ

The A2F5 is a fixed displacement, bent-axis axial piston hydraulic motor manufactured by Bosch Rexroth (originally developed under the Brueninghaus Hydromatik / Uchida Rexroth lineage). "Fixed displacement" means the swept volume per revolution never changes — unlike a variable motor, there's no swashplate angle to adjust. Output speed and torque are governed entirely by the flow and pressure supplied to it.

Common Applications

The A2F5's small footprint and high-speed capability steer it toward a specific set of jobs rather than heavy traction drives.

Mobile Equipment

- Cooling fan drives on construction and agricultural machinery

- Small auger or brush drives on attachments

- Auxiliary winches and compact actuators on skid loaders and compact utility vehicles

Industrial Machinery

- Hydrostatic drives for small conveyors and indexing tables

- Test rigs and lab equipment requiring precise, repeatable rotary input

- Packaging and material-handling machines where space is at a premium

Installation and Operating Considerations

A few practical points come up repeatedly when engineers select or troubleshoot an A2F5:

Case Drain and Priming

Like all axial piston units, the A2F5's case must be filled with hydraulic fluid before startup, and it needs a case drain line back to the tank — running it dry, even briefly, causes bearing damage almost immediately.

Fluid Cleanliness

Piston motors are far less tolerant of particulate contamination than gear motors. Rexroth specifies strict cleanliness classes for the A2F line, and a degraded or bypassed filter is one of the most common root causes of premature A2F5 failure in the field.

Minimum Inlet Pressure

At high shaft speeds, the case and inlet need adequate absolute pressure to avoid cavitation. Running an A2F5 near its top rated speed without meeting the minimum inlet pressure spec will shorten its life dramatically, even if it seems to "run fine" for a while.

Shaft Loading

If the A2F5 is driven through a pinion, sprocket, or belt that imposes radial side load, Rexroth typically requires derating the nominal pressure to protect the shaft bearings — this is a detail that's easy to miss when repurposing a motor for a non-standard mechanical linkage.

For more information on the A2F5 hydraulic motor, please visit https://www.baolilaihydraulic.com/product/.

Specifications

Size			5	10	12	16	23	28	32	45	56	63	80
Displacement	Vg	cm³	4,93	10,3	12	16	22,9	28,1	32	45,6	56,1	63	80,4
Max. Speed	n_max	min⁻¹	10 000	8000	8000	8000	6300	6300	6300	5600	5000	5000	4500
	n_{max intermit}	min⁻¹	11 000	8800	8800	8800	6900	6900	6900	6200	5500	5500	5000
Max.flow n_max	q_V_max	L/min	49	82	96	128	144	176	201	255	280	315	360
Torque constants	T_K	Nm/bar	0,076	0,164	0,19	0,25	0,36	0,445	0,509	0,725	0,89	1,0	1,27
Torque at Δp=350 bar	T	Nm	24,7	57	67	88	126	156	178	254	312	350	445
Torque at Δp=400 bar	T	Nm	-	65	76	100	144	178	204	290	356	400	508
Case volume		L		0,17	0,17	0,17	0,20	0,20	0,20	0,33	0,45	0,45	0,55
Moment of inertia about drive axis	J	kgm²	0,00008	0,0004	0,0004	0,0004	0,0012	0,0012	0,0012	0,0024	0,0042	0,0042	0,0072
Weight (approx.)	m	kg	2,5	5,4	5,4	5,4	9,5	9,5	9,5	13,5	18	18	23

Size			90	107	125	160	180	200	250	355	500	710	1000
Displacement	Vg	cm³	90	106,7	125	160,4	180	200	250	355	500	710	1000
Max. Speed	n_max	min⁻¹	4500	4000	4000	3600	3600	2750	2500	2240	2000	1600	1600
	n_{max intermit}	min⁻¹	5000	4400	4400	4000	4000	3000	–	–	–	–	–
Max.flow n_max	q_V_max	L/min	405	427	500	577	648	550	625	795	1000	1136	1600
Torque constants	T_K	Nm/bar	1,43	1,70	1,99	2,54	2,86	3,18	3,98	5,65	7,96	11,3	15,9
Torque at Δp=350 bar	T	Nm	501	595	697	889	1001	1114	1393	1978	2785	3955	5570
Torque at Δp=400 bar	T	Nm	572	680	796	1016	1144	1272	–	–	–	–	–
Case volume		L	0,55	0,8	0,8	1,1	1,1	2,5	3,5	–	–	–	7,8
Moment of inertia about drive axis	J	kgm²	0,0072	0,0116	0,0116	0,0220	0,0220	0,0378	0,061	0,102	0,178	0,55	0,55
Weight (approx.)	m	kg	23	32	32	45	45	66	73	110	155	322	336

Selection Table

A2F5 hydraulic motor
Model No.	Model Code
R902193460	A2F5/60W-B3
R902197689	A2F5/60W-B3
R902092023	A2F5/60W-B3-E
R902161428	A2F5/60W-B3-S
R902193779	A2F5/60W-B3-S
R902197581	A2F5/60W-B3-S
R902197732	A2F5/60W-B3-S
R902197810	A2F5/60W-B3-S
R902198026	A2F5/60W-B3-S
R902198027	A2F5/60W-B3-S
R902198170	A2F5/60W-B3-S
R902198249	A2F5/60W-B3-S
R902201668	A2F5/60W-B3-S
R902203103	A2F5/60W-B3-S
R909418904	A2F5/60W-B3-S
R909605161	A2F5/60W-B3-S
R902193229	A2F5/60W-BX-S
R902198175	A2F5/60W-C3
R902201904	A2F5/60W-C3
R902204758	A2F5/60W-C3
R909404449	A2F5/60W-C3
R902090368	A2F5/60W-C3-S
R902101736	A2F5/60W-C3-S
R902193376	A2F5/60W-C3-S
R902197776	A2F5/60W-C3-S
R902197870	A2F5/60W-C3-S
R902198167	A2F5/60W-C3-S
R902052392	A2F5/W60-B3-S
R902092282	A2F5W6.0B3-ES
R902049253	A2F5W6.0B3-S
R909428772	A2F5W60-B3-S
R909429115	A2F5W60-B3-S
R909424678	A2F5W60-BX-S
R909411142	A2F5W60-C3-S
R909603601	A2F5W60-C3-S

Q1: What hydraulic fluids is the A2F5 compatible with?

A1: Mineral oil is standard. HFB, HFC, and HFD fire-resistant fluids are usable with appropriate seal materials (FKM) and Rexroth's documented derating for those fluid types; HFA fluids are not suitable for this motor.

Q2: How is the A2F5 different from a gear motor of similar size?

A2: Piston motors like the A2F5 generally offer higher efficiency, higher pressure capability, and longer service life under demanding duty cycles than gear motors of comparable displacement, at a higher unit cost and greater sensitivity to fluid contamination.