AXIAL-PISTON MOTOR A2FM125/61W-VAB020 GO2EU

Manufacturer: Bosch Rexroth

Material #: R902230010

Model : A2FM125/61W-VAB020 GO2EU

***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 A2FM125/61W-VAB020 (R902230010) is a robust axial piston motor designed for high-pressure applications in both open and closed hydraulic circuits. This fixed displacement unit is characterized by its bent axis design, which allows for a compact form factor and high power density, making it suitable for a wide range of demanding applications. The A2FM series motors are known for their exceptional total efficiency and starting performance. With a size of 125 cm³, the A2FM125/61W-VAB020 motor can handle a nominal pressure of up to 400 bar and a maximum pressure of 450 bar. It features standard mounting bolts and an SAE flange or thread for the working ports, ensuring compatibility with various systems. The motor's drive shaft is designed with a splined shaft according to DIN standards, which contributes to its reliable torque generation. This model comes with FKM sealing material and standard WDR shaft seal to maintain its integrity under various operational conditions. It does not include low-temperature capabilities or an integrated pressure relief valve but offers options for additional valves such as counterbalance valve BVDBVE or flushing and boost pressure valve if required. The A2FM125/61W-VAB020 has a standard bearing for the drive shaft, ensuring durability and longevity. Its housing port status includes a T-plugged leakage oil port, while the rotary group's hydraulic part is of standard design. The paint top coat is omitted for this model, which comes in RAL 9005 deep black base coat. This all-purpose high-pressure motor boasts an alternating direction of rotation and does not come with speed sensing capabilities. Its maximum flow rate is not specified but will depend on the operating conditions. Weighing approximately 27 kg, it offers versatility through its wide range of nominal sizes tailored to specific application requirements. In summary, the Bosch Rexroth A2FM125/61W-VAB020 axial piston unit stands out with its high efficiency, power density, and adaptability to various hydraulic systems where reliability and performance are critical.

$8,110.00 USD

More are expected on April 30, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as April 30, 2025 when ordered in

This product is eligible for factory repair.

Repairs from $1,631.00

AXIAL-PISTON MOTOR A2FM125/61W-VAB020 *GO2EU*

A2FM, fixed displacement unit, closed circuit, high pressure, size: 125 cm³

A2FM is a fixed displacement motor with an axial tapered piston rotary group in bent axis design for hydrostatic drives in the open and closed circuit. With axial piston units in bent axis design, the pistons are arranged at an angle to the drive shaft. The pistons rest directly on the drive shaft where they generate torque depending on the pressure.

Unpacked Weight: 36.2 kg

Data Sheet	Download Data Sheet
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual

Paint/top coat	without
Test certificate	without
Series	61
Productgroup ID	9,10,11,12,13,14
Mounting bolts	Standard
Low temperature version	no
Housing port, status	Leakage oil port T1 plugged
Rotary group, hydraulic part	Standard
Shaft seal	Standard WDR
Shaft end	A (splined shaft DIN 5480)
Pressure relief valve	without
Installation version of port plate	Installation version 1 (standard)
Sealing material	FKM
Type of actuation	Motor
Speed sensing	without
Test certificate language code	Without
Drive shaft bearing	Standard bearing
Product family	A2FM
Housing ports	Leakage oil port T1
Port plate	A-Standard
Classification society (external)	Standard (without acceptance)
Paint/base coat	RAL 9005 deep black
Direction of rotation	alternating
Max. flow	0.0
Product (axial piston unit)	A2FM
Working ports	02 (port A, B;SAE lat.opp.)
Mounting flange	4-hole ISO 3019-2
Size (displacement)	125
Weight	36.2

Large variety of available nominal sizes allows exact adjustment to the application High power density Very high total efficiency High starting efficiency Working ports SAE flange or thread Optional with integrated pressure relief valve Optional with mounted addifitonal valve: counterbalance valve (BVD/BVE), flushing and boost-pressure valve Bent-axis design

1)	Tapered shaft with threaded pin and woodruff key (DIN 6888). The torque must be transmitted via the tapered press fit.

1)	Threaded ports at the sides plugged with threaded plugs.
2)	Please contact us.
3)	Specify ordering code of counterbalance valve according to data sheet 95522 (BVD) respectively data sheet 95525 (BVE) separately.
4)	Specify ordering code of sensor according to data sheet 95133 (DSA) respectively data sheet 95135 (HDD) separately.

Table of values

Size				5	10	12	16	23	28	32	107	125	160	180	200	250	355	500	710	1000
Displacement geometric, per revolution		Vg	cm³	4.93	10.3	12	16	22.9	28.1	32	106.7	125	160.4	180	200	250	355	500	710	1000
Nominal pressure		pnom	bar	315	400	400	400	400	400	400	400	400	400	400	400	350	350	350	350	350
Maximum pressure		pmax	bar	350	450	450	450	450	450	450	450	450	450	450	450	400	400	400	400	400
Maximum speed		nnom 1)	rpm	10000	8000	8000	8000	6300	6300	6300	4000	4000	3600	3600	2750	2700	2240	2000	1600	1800
Maximum speed		nmax 2)	rpm	11000	8800	8800	8800	6900	6900	6900	4400	4400	4000	4000	3000
Inlet flow 3)	at nnom	qV	l/min	49	82	96	128	144	177	202	427	500	577	648	550	675	795	1000	1136	1600
Torque 4)	at pnom	M	Nm	24.7	66	76	102	146	179	204	679	796	1021	1146	1273	1393	1978	2785	3955	5570
Rotary stiffness		c	kNm/rad	0.63	0.92	1.25	1.59	2.56	2.93	3.12	11.2	11.9	17.4	18.2	57.3	73.1	96.1	144	270	324
Moment of inertia for rotary group		JTW	kg·m²	0.00006	0.0004	0.0004	0.0004	0.0012	0.0012	0.0012	0.0116	0.0116	0.022	0.022	0.0353	0.061	0.102	0.178	0.55	0.55
Maximum angular acceleration		ɑ	rad/s²	5000	5000	5000	5000	6500	6500	6500	4500	4500	3500	3500	11000	10000	8300	5500	4300	4500
Case volume		V	l		0.17	0.17	0.17	0.2	0.2	0.2	0.8	0.8	1.1	1.1	2.7	2.5	3.5	4.2	8	8
Weight (approx.)		m	kg	2.5	5.4	5.4	5.4	9.5	9.5	9.5	32	32	45	45	66	73	110	155	325	336

1)	These values are valid at: - for the optimum viscosity range from vopt = 36 to 16 mm2/s - with hydraulic fluid based on mineral oils
2)	Intermittent maximum speed: overspeed for unload and overhauling processest, t < 5 s and Δp < 150 bar
3)	Restriction of input flow with counterbalance valve
4)	Torque without radial force, with radial force see table "Permissible radial and axial forces of the drive shafts"

Note

The values in the table are theoretical values, without consideration of efficiencies and tolerances. The values are rounded. Exceeding the maximum or falling below the minimum permissible values can lead to a loss of function, a reduction in operational service life or total destruction of the axial piston unit. Other permissible limit values, such as speed variation, reduced angular acceleration as a function of the frequency and the permissible angular acceleration at start (lower than the maximum angular acceleration) can be found in data sheet 90261.

Speed range

No limit to minimum speed nmin. If uniformity of motion is required, speed nmin must not be less than 50 rpm.

Determining the operating characteristics
Inlet flow		[l/min]
Rotational speed		[rpm]
Torque		[Nm]
Power		[kW]

Key
Vg	Displacement per revolution [cm3]
Δp	Differential pressure [bar]
n	Rotational speed [rpm]
ηv	Volumetric efficiency
ηhm	Hydraulic-mechanical efficiency
ηt	Total efficiency (ηt = ηv • ηhm)

Hydraulic fluids

The axial piston unit is designed for operation with mineral oil HLP according to DIN 51524.

Application instructions and requirements for hydraulic fluids should be taken from the following data sheets before the start of project planning:

90220: Hydraulic fluids based on mineral oils and related hydrocarbons 90221: Environmentally acceptable hydraulic fluids 90222: Fire-resistant, water-free hydraulic fluids (HFDR, HFDU) 90223: Fire-resistan, water-containing hydraulic fluids (HFAE, HFAS, HFB, HFC) 90225: Restricted technical data for operation with fire-resistant hydraulic fluids

Viscosity and temperature of hydraulic fluids

	Viscosity	Shaft seal	Temperature1)	Comment
Cold start	νmax ≤ 1600 mm²/s	NBR2)	ϑSt ≥ -40 °C	t ≤ 3 min, without load (p ≤ 50 bar), n ≤ 1000 rpm, permissible temperature difference between axial piston unit and hydraulic fluid max. 25 K
Cold start	νmax ≤ 1600 mm²/s	FKM	ϑSt ≥ -25 °C
Warm-up phase	ν = 400 … 1600 mm²/s			t ≤ 15 min, p ≤ 0.7 • pnom and n ≤ 0.5 • nnom
Continuous operation	ν = 10 … 400 mm²/s3)	NBR2)	ϑ ≤ +78 °C	measured at port T
	ν = 10 … 400 mm²/s3)	FKM	ϑ ≤ +103 °C	measured at port T
	νopt = 16 … 36 mm²/s			range of optimum operating viscosity and efficiency
Short-term operation	νmin = 7 … 10 mm²/s	NBR2)	ϑ ≤ +78 °C	t ≤ 3 min, p ≤ 0.3 • pnom measured at port T
Short-term operation	νmin = 7 … 10 mm²/s	FKM	ϑ ≤ +103 °C	t ≤ 3 min, p ≤ 0.3 • pnom measured at port T

1)	If the specified temperatures cannot be maintained due to extreme operating parameters, please contact us.
2)	Special version, please contact us.
3)	Equates e.g. with the VG 46 a temperature range of +5 °C to +85 °C (see selection diagram)

Note

To reduce high temperature of the hydraulic fluid in the axial piston unit we recommend the use of a flushing and boost pressure valve (see chapter Extended functions and versions).

Dependent on the unit size flushing the case at port U can be carried out alternatively.

Selection of hydraulic fluid

Bosch Rexroth evaluates hydraulic fluids on the basis of the Fluid Rating according to the technical data sheet 90235.

Hydraulic fluids with positive evaluation in the Fluid Rating are provided in the following technical data sheet:

90245: Bosch Rexroth Fluid Rating List for Rexroth hydraulic components (pumps and motors)

The hydraulic fluid should be selected so that the operating viscosity in the operating temperature range is within the optimum range (νopt; see selection diagram).

Selection diagram

Filtration of the hydraulic fluid

Finer filtration improves the cleanliness level of the hydraulic fluid, which increases the service life of the axial piston unit.

A cleanliness level of at least 20/18/15 is to be maintained according to ISO 4406.

At a hydraulic fluid viscosity of less than 10 mm²/s (e.g. due to high temperatures in short-term operation) at the drain port, a cleanliness level of at least 19/17/14 according to ISO 4406 is required.

For example, the viscosity is 10 mm²/s at:

HLP 32 a temperature of 73°C HLP 46 a temperature of 85°C

Operating pressure range

Pressure at working port A or B (high-pressure side)			Definition
Nominal pressure	pnom	see table of values	The nominal pressure corresponds to the maximum design pressure.
Maximum pressure	pmax	see table of values	The maximum pressure corresponds to the maximum operating pressure within the single operating period. The sum of the single operating periods must not exceed the total operating period.
Single operating period		10 s
Total operating period		300 h
Minimum pressure	pHP min	25 bar	Minimum pressure on high-pressure side (port A or B) required to prevent damage to the axial piston unit.
Minimum pressure at inlet (pump operating mode)	pE min	see diagram	To prevent damage to the axial piston motor in pump mode (change of high-pressure side with unchanged direction of rotation, e.g. when braking),a minimum pressure must be guaranteed at the working port (inlet). The minimum pressure depends on the rotational speed and displacement of the axial piston unit.
Total pressure	pSu	700 bar	The summation pressure is the sum of the pressures at both work ports (A and B).
Rate of pressure change			Definition
with integrated pressure relief valve	RA max	9000 bar/s	Maximum permissible rate of pressure build-up and reduction during a pressure change over the entire pressure range.
without pressure relief valve	RA max	16000 bar/s
Case pressure at port T			Definition
Continuous differential pressure	ΔpT cont	2 bar	Maximum averaged differential pressure at the shaft seal (case to ambient)
Pressure peaks	pT peak	10 bar	t < 0.1 s

Note

Working pressure range valid when using hydraulic fluids based on mineral oils. Values for other hydraulic fluids, please contact us.

Minimum pressure at inlet (pump operating mode)

This diagram is only valid for the optimum viscosity range of vopt = 16 to 36 mm2/sec..

If the above mentioned conditions cannot be ensured, please contact us.

Pressure definition

1)	Total operating period = t1 + t2 + ... + tn

Rate of pressure change

Maximum differential pressure at the shaft seal, size 10 ... 200

Maximum differential pressure at the shaft seal, size 250 ... 1000

Note

The service life of the shaft seal is influenced by the speed of the axial piston unit and the case pressure. The service life decreases with an increase of the mean differential pressure between the case and the ambient pressure and with a higher frequency of pressure spikes. The case pressure must be equal to or higher than the ambient pressure.

Direction of flow

Direction of rotation, viewed on drive shaft
clockwise	counter-clockwise
A to B	B to A

Permissible radial and axial forces of the drive shaft

Size
Drive shaft		Code
Drive shaft		⌀
Maximum radial force at distance a (from shaft collar)		Fq max
Maximum radial force at distance a (from shaft collar)		a
Permitted torque at Fq max		Tq max
Permitted differential pressure at Fq max		Δpq max
Maximum axial force, when standstill or in non-pressurized conditions		+ Fax max
		- Fax max
Maximum axial force, per bar operating pressure		+ Fax max

General instructions

The values given are maximum values and do not apply to continuous operation. The axial force in direction −Fax is to be avoided as the service life of the bearing is reduced. Special requirements apply in the case of belt drives. Please contact us.

Notes for sizes 250 ... 1000:

In case of radial forces limited performance data is valid. Please contact us. In case of axial forces during operation of the unit please contact us.

Effect of radial force Fq on the service life of bearings

By selecting a suitable direction of radial force Fq the load on the bearings caused by the internal rotary group forces can be reduced, thus optimizing the service life of the bearings. Recommended position of mating gear is dependent on direction of rotation. Examples:

Toothed gear drive, size 5 … 180

Toothed gear drive, size 200 … 1000

1	Direction of rotation "counter-clockwise", pressure at port B
2	Direction of rotation "clockwise", pressure at port A
3	Direction of rotation "bidirectional"

Long-life bearing

Size 250 to 1000

For long life cycle and use with HF hydraulic fluids. Identical external dimensions as design with standard bearing. Subsequent modification to long-life bearing is possible. Bearing and housing flushing via connection U is recommended.

Bearing flushing

Flushing flow (recommended)

Size		250	355	500	710	1000
Flushing flow qv	l/min	10	16	16	16	16

Size 5

1)	To shaft collar

Drive shafts

1)	Center bore according to DIN 332 (thread according to DIN 13)
2)	Thread according to DIN 3852, maximum tightening torque: 30 Nm

Ports

Size			5
A, B	Working port	Size	M18 × 1,5; 12 mm deep
		Standard 1)	DIN 3852
		State on delivery	With protective cover (must be connected)
T1	Drain port	Size	M10 × 1; 8 mm deep
		Standard 1)	DIN 3852
		State on delivery 2)	Plugged (observe installation instructions)
T2	Drain port	Size	M10 × 1; 8 mm deep
		Standard 1)	DIN 3852
		State on delivery 2)	Plugged (observe installation instructions)

1)	The spot face can be deeper than specified in the appropriate standard.
2)	Unless otherwise specified. Other layouts on request.

Size 10 … 16

1)	To shaft collar
2)	Flange similar to ISO 3019-2

Drive shafts Z and A

1)	Center bore according to DIN 332 (thread according to DIN 13)

Drive shafts P and B

1)	Center bore according to DIN 332 (thread according to DIN 13)

Port plate 03

Threaded ports at side, opposite

Port plate 04

Threaded ports at side and rear

Ports

Size			10	12	16
A, B	Working port	Size	M22 × 1,5; 14 mm deep
		Standard 1)	DIN 3852
		State on delivery 2)	With protective cover (must be connected)
T1	Drain port	Size	M12 × 1,5; 12 mm deep
		Standard 1)	DIN 3852
		State on delivery 3)	Plugged (observe installation instructions)
T2	Drain port	Size	M12 × 1,5; 12 mm deep
		Standard 1)	DIN 3852
		State on delivery 3)	With protective cover (observe installation instructions)

1)	The spot face can be deeper than specified in the appropriate standard.
2)	Unless otherwise specified: In case of connection plate 04 ports at the sides plugged. Other layouts on request.
3)	Unless otherwise specified. Other layouts on request.

Size 23 … 180

1)	To shaft collar
2)	Flange ISO 3019-2

Size	D1		D8	D9	D10	D11	D17	D18	D19	D20	D25	D28	D29	D32
Size	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
23	100	0 - 0.022	18	8	25	23.2	25	106	56	42	118	125	11	106
28	100	0 - 0.022	18	8	25	23.2	25	106	56	42	118	125	11	106
32	100	0 - 0.022	18	8	25	23.2	25	106	56	42	118	125	11	106
107	160	0 - 0.025	23	10	40	23	40	140	85	65	190	200	17.5	150
125	160	0 - 0.025	23	10	40	23	40	140	85	65	190	200	17.5	150
160	180	0 - 0.025	25	10	40	37.2	47	158	96	72	210	224	17.5	180
180	180	0 - 0.025	25	10	40	37.2	47	158	96	72	210	224	17.5	180

Drive shafts Z and A

1)	Center bore according to DIN 332 (thread according to DIN 13)

Splined shaft DIN 5480

NG	Code	Designation	Thread G	N2	N3	N4	N5	ØN6
NG	Code	Designation	Thread G	mm	mm	mm	mm	mm
23	Z	W25×1.25×18×9g	M8 × 1.25	6	19	28	43	35
23	A	W30×2×14×9g	M10 × 1.5	7.5	22	27	35	35
28	Z	W25×1.25×18×9g	M8 × 1.25	6	19	28	43	35
28	A	W30×2×14×9g	M10 × 1.5	7.5	22	27	35	35
32	A	W30×2×14×9g	M10 × 1.5	7.5	22	27	35	35
107	Z	W40×2×18×9g	M12 × 1.75	9.5	28	37	45	50
107	A	W45×2×21×9g	M16 × 2	12	36	42	50	50
125	A	W45×2×21×9g	M16 × 2	12	36	42	50	50
160	Z	W45×2×21×9g	M16 × 2	12	36	42	50	60
160	A	W50×2×24×9g	M16 × 2	12	36	44	55	60
180	A	W50×2×24×9g	M16 × 2	12	36	44	55	60

Drive shafts P and B

1)	Center bore according to DIN 332 (thread according to DIN 13)

Parallel keyed shaft DIN 6885

NG	Code	Designation	Thread G	⌀N1		N2	N3	N5	⌀N6	N7	N8
NG	Code	Designation	Thread G	mm	mm	mm	mm	mm	mm	mm	mm
23	P	⌀25, AS8×7×40	M8 × 1.25	25	+ 0.015 + 0.002	6	19	50	35	28	8
23	B	⌀30, AS8×7×40	M10 × 1.5	30	+ 0.015 + 0.002	7.5	22	50	35	33	8
28	P	⌀25, AS8×7×40	M8 × 1.25	25	+ 0.015 + 0.002	6	19	50	35	28	8
28	B	⌀30, AS8×7×40	M10 × 1.5	30	+ 0.015 + 0.002	7.5	22	50	35	33	8
32	B	⌀30, AS8×7×40	M10 × 1.5	30	+ 0.015 + 0.002	7.5	22	50	35	33	8
107	P	⌀40, AS12×8×63	M12 × 1.75	40	+ 0.018 + 0.002	9.5	28	80	50	43	12
107	B	⌀45, AS14×9×63	M16 × 2	45	+ 0.018 + 0.002	12	36	80	50	48.5	14
125	B	⌀45, AS14×9×63	M16 × 2	45	+ 0.018 + 0.002	12	36	80	50	48.5	14
160	P	⌀45, AS14×9×70	M16 × 2	45	+ 0.018 + 0.002	12	36	90	60	48.5	14
160	B	⌀50, AS14×9×70	M16 × 2	50	+ 0.018 + 0.002	12	36	90	60	53.5	14
180	B	⌀50, AS14×9×70	M16 × 2	50	+ 0.018 + 0.002	12	36	90	60	53.5	14

Port plate 01

SAE working ports at rear

Size	D3	D4	D14	D15	D34	D40	D41	D42	D46
Size	mm	mm	mm	mm	mm	mm	mm	mm	mm
23 … 32	173	106	78	153	115	18.2	40.5	13	59
107 … 125	252	159	120	225.5	194	31.8	66.7	32	99
160 … 180	294	188	134	252	194	31.8	66.7	32	99

Port plate 02

SAE working ports at side, opposite

Size	D3	D4	D7	D12	D13	D40	D41	D42
Size	mm	mm	mm	mm	mm	mm	mm	mm
23 … 32	190	117	120	70	144	18.2	40.5	13
107	285	181	178	110	213	27.8	57.2	25
125	285	181	178	110	213	31.8	66.7	32
160 … 180	294	188	202	121	237	31.8	66.7	32

Port plate 03

Threaded ports at side, opposite

Size	D3	D4	D7	D12	D13
Size	mm	mm	mm	mm	mm
23 … 32	190	117	120	70	144

Port plate 04

Threaded ports at side and rear

Size	D3	D4	D7	D12	D13	D14	D15	D34	D46
Size	mm	mm	mm	mm	mm	mm	mm	mm	mm
23 … 32	190	117	130	70	144	88	166	120	58

Port plate 10

SAE working ports at bottom

Size	D3	D4	D14	D15	D33	D34	D40	D41	D42	D46
Size	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
28 … 32	178	106	91	158	115	40	18.2	40.5	13	59
107 … 125	261	157	136	226	194	70	31.8	66.7	32	99
160 … 180	290	185	149	252	194	70	31.8	66.7	32	99

Note

The dimensional drawings of the port plates with valves can be found in the chapter "Extended functions and versions".

Ports

Size			23	28	32	107	125	160	180
A, B (plate 01, 02, 10)	Working port	Size	1/2 in			1 1/4 in 1)	1 1/4 in
		Standard	Dimensions according to SAE J518
		Fastening thread 2)	M8 × 1,25; 15 mm deep			M14 × 2; 19 mm deep 1)	M14 × 2; 19 mm deep
		State on delivery	With protective cover (must be connected)
A, B (plate 03, 04)	Working port	Size	M27 × 2; 16 mm deep
		Standard 3)	DIN 3852
		State on delivery 4)	With protective cover (must be connected)
T1	Drain port	Size	M16 × 1,5; 12 mm deep			M18 × 1,5; 12 mm deep		M22 × 1,5; 14 mm deep
		Standard 3)	DIN 3852
		State on delivery 5)	Plugged (observe installation instructions)
T2	Drain port	Size	M16 × 1,5; 12 mm deep			M18 × 1,5; 12 mm deep		M22 × 1,5; 14 mm deep
		Standard 3)	DIN 3852
		State on delivery 5)	With protective cover (observe installation instructions)

1)	In case of port plate 02: Size of working port A, B: 1 in with fastening threads M12 × 1,75, 17 mm deep
2)	Thread according to DIN 13
3)	The spot face can be deeper than specified in the appropriate standard.
4)	Unless otherwise specified: In case of connection plate 04 ports at the sides plugged. Other layouts on request.
5)	Unless otherwise specified. Other layouts on request.