A2FM28/61W-VAB020

Manufacturer: Bosch Rexroth

Material #: R902165016

Model : A2FM28/61W-VAB020

***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 A2FM28/61W-VAB020 (R902165016) is a high-performance axial piston motor characterized by its bent-axis design, ensuring optimal efficiency and reliability for demanding applications. This all-purpose high-pressure motor is engineered to operate effectively in both open and closed hydraulic circuits. With a nominal pressure rating of up to 280 bar and a maximum pressure capacity of 350 bar, it is designed to handle rigorous operational demands with ease. A standout feature of the A2FM28/61W-VAB020 is its large selection of nominal sizes, which allows for precise customization to specific application requirements. This versatility is complemented by the motor's high power density and exceptional total efficiency, including a very high starting efficiency that ensures smooth operation from the outset. The working ports on the A2FM28/61W-VAB020 are designed for flexibility, offering either SAE flange or thread options depending on installation needs. In addition, this model can be optionally equipped with an integrated pressure relief valve for enhanced safety and performance control. For further customization, there's also the option to mount additional valves such as counterbalance valves (BV/BVE), flushing, and boost pressure valves, providing additional control and protection mechanisms tailored to specialized uses. Constructed with durability in mind, this metric version motor is suitable for a wide range of applications where robustness and long service life are critical. The A2FM28/61W-VAB020's design ensures that it can deliver consistent performance even under high load conditions, making it an ideal choice for industrial applications requiring dependable hydraulic power transmission.

$3,512.00 USD

More are expected on April 1, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as April 1, 2025 when ordered in

This product is eligible for factory repair.

Repairs from $706.00

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.

Size 200

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

Drive shafts

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

Ports

Size			200
A, B	Working port	Size	1 1/4 in
		Standard	Dimensions according to SAE J518
		Fastening thread 1)	M14 × 2; 19 mm deep
		State on delivery	With protective cover (must be connected)
T1	Drain port	Size	M22 × 1,5; 14 mm deep
		Standard 2)	DIN 3852
		State on delivery 3)	Plugged (observe installation instructions)
T2	Drain port	Size	M22 × 1,5; 14 mm deep
		Standard 2)	DIN 3852
		State on delivery 3)	With protective cover (observe installation instructions)

1)	Thread according to DIN 13
2)	The spot face can be deeper than specified in the appropriate standard.
3)	Unless otherwise specified. Other layouts on request.

Size 250

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

Drive shafts

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

Port plate 01

SAE working ports at rear

Port plate 02

SAE working ports at side, opposite

Ports

Size			250
A, B	Working port	Size	1 1/4 in
		Standard	Dimensions according to SAE J518
		Fastening thread 1)	M14 × 2; 19 mm deep
		State on delivery	With protective cover (must be connected)
T1	Drain port	Size	M22 × 1,5; 14 mm deep
		Standard 2)	DIN 3852
		State on delivery 3)	With protective cover (observe installation instructions)
T2	Drain port	Size	M22 × 1,5; 14 mm deep
		Standard 2)	DIN 3852
		State on delivery 3)	Plugged (observe installation instructions)
U	Bearing flushing	Size	M14 × 1,5; 12 mm deep
		Standard 2)	DIN 3852
		State on delivery	Plugged

1)	Thread according to DIN 13
2)	The spot face can be deeper than specified in the appropriate standard.
3)	Unless otherwise specified. Other layouts on request.

Size 355 … 1000

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

Size	D1		D3	D4	D5	D7	D8	D9	D10	D11	D14	D15	D17	D18	D20	D24	D25	D27	D28	D29	D30	D32	D40	D41	D42	D46
Size	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm		mm	mm	mm	mm	mm
355	280	0 - 0.081	350	198	171	250	28	14	50	48	102	320	128	83	83	23.5	335	360	320	18	M18	245	36.6	79.4	40	120
500	315	0 - 0.081	396	220	192	276	30	14	50	48	112.5	362	142	98	111	27.5	375	400	360	22	M20	270	36.6	79.4	40	130
710	400	0 - 0.089	507	249	236	344	35	14	50	47	102	485	183	131	156	41.5	465	500	450	22	M24	340	44.5	96.8	50	170
1000	400	0 - 0.089	511	277	236	344	35	14	50	47	143	468	183	131	156	41.5	465	500	450	22	M24	340	44.5	96.8	50	170

Drive shaft Z

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	⌀N6
NG	Code	Designation	Thread G	mm	mm	mm	mm	mm
355	Z	W60×2×28×9g	M20 × 2.5	15	42	71	82	70
500	Z	W70×3×22×9g	M20 × 2.5	15	42	67	80	80
710	Z	W90×3×28×9g	M24 × 3	18	50	91	105	100
1000	Z	W90×3×28×9g	M24 × 3	18	50	91	105	100

Drive shaft P

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
355	P	⌀60, AS18×11×100	M20 × 2.5	60	+ 0.03 + 0.011	15	42	105	70	64	18
500	P	⌀70, AS20×12×100	M20 × 2.5	70	+ 0.03 + 0.011	15	42	105	80	74.5	20
710	P	⌀90, AS25×14×125	M24 × 3	90	+ 0.035 + 0.013	18	50	130	100	95	25
1000	P	⌀90, AS25×14×125	M24 × 3	90	+ 0.035 + 0.013	18	50	130	100	95	25

Ports

Size			355	500	710	1000
A, B	Working port	Size	1 1/2 in		2 in
		Standard	Dimensions according to SAE J518
		Fastening thread 1)	M16 × 2; 21 mm deep		M20 × 2,5; 30 mm deep
		State on delivery	With protective cover (must be connected)
T1	Drain port	Size	M33 × 2; 18 mm deep		M42 × 2; 20 mm deep
		Standard 2)	DIN 3852
		State on delivery 3)	With protective cover (observe installation instructions)
T2	Drain port	Size	M33 × 2; 18 mm deep		M42 × 2; 20 mm deep
		Standard 2)	DIN 3852
		State on delivery 3)	Plugged (observe installation instructions)
U	Bearing flushing	Size	M14 × 1,5; 12 mm deep	M18 × 1,5; 12 mm deep
		Standard 2)	DIN 3852
		State on delivery	Plugged
MA, MB	Measuring port pressure A, B	Size	M14 × 1,5; 12 mm deep
		Standard 2)	DIN 3852
		State on delivery	Plugged

1)	Thread according to DIN 13
2)	The spot face can be deeper than specified in the appropriate standard.
3)	Unless otherwise specified. Other layouts on request.

Flushing and boost pressure valve

The flushing and boost pressure valve is used in closed circuits for the removal of heat and to ensure a minimum boost pressure level.

Hydraulic fluid is directed from the respective low pressure side into the motor housing. This is then fed into the reservoir, together with the leakage. The removed hydraulic fluid must be replaced by cooled hydraulic fluid from the boost pump.

With port plate 027, the valve is mounted directly on the fixed motor (sizes 45 to 180, 250); with port plate 017 (sizes 355 and 500) on a plate.

Cracking pressure of pressure retaining valve

(observe when setting the primary valve)

Sizes 45 to 500, fixed setting: 16 bar

Switching pressure of flushing piston Δp

Sizes 45 to 500: 8±1 bar

Flushing and boost pressure valve

The flushing and boost pressure valve is used in closed circuits for the removal of heat and to ensure a minimum boost pressure level.

With port plate 027, the valve is mounted directly on the fixed motor (sizes 45 to 180, 250); with port plate 017 (sizes 355 and 500) on a plate.

Cracking pressure of pressure retaining valve

(observe when setting the primary valve)

Sizes 45 to 500, fixed setting: 16 bar

Switching pressure of flushing piston Δp

Sizes 45 to 500: 8±1 bar

Circuit diagram

Flushing flow qv

Orifices (throttles with integrated valve) can be used to set the flushing flows as required.

The specifications below are based on:

ΔpND = pND – pG = 25 bar and ν = 10 mm²/s

(pND = low pressure, pG = case pressure)

Flushing flow qv

Orifices (throttles with integrated valve) can be used to set the flushing flows as required.

The specifications below are based on:

ΔpND = pND – pG = 25 bar and ν = 10 mm²/s

(pND = low pressure, pG = case pressure)

With sizes 45 to 180, orifices can be supplied for flushing flows from 3.5 to 10 l/min. For flushing flows deviating from the values in the table, please state the required flushing flow when ordering. The flushing flow without orifice is approx. 12 to 14 l/min at low pressure ΔpND = 25 bar.

Dimensions

Port plate 027

SAE working ports at side, opposite

Port plate 027

SAE working ports at side, opposite

Port plate 017

SAE working ports at rear

Port plate 017

SAE working ports at rear

Pressure relief valve

The MHDB pressure relief valves protect the hydraulic motor from overload. As soon as the set cracking pressure is reached, the hydraulic fluid flows from the high-pressure side to the low-pressure side.

The pressure relief valves are only available in conjunction with connection plates 181, 191 or 192. (Connection plate 181: see section “BVD and BVE counterbalance valve”

Setting range of cracking pressure: 50 up to 420 bar

For versions “with pressure sequencing stage” (code 192), a higher pressure setting can be implemented by connecting an external pilot pressure of 25 up to 30 bar at port pSt.

When ordering, state in plain text:

Cracking pressure of pressure relief valve Cracking pressure with pilot pressure applied to pSt (only with version 192)

Pressure relief valve

The pressure relief valves are only available in conjunction with connection plates 181, 191 or 192. (Connection plate 181: see section “BVD and BVE counterbalance valve”

Setting range of cracking pressure: 50 up to 420 bar

For versions “with pressure sequencing stage” (code 192), a higher pressure setting can be implemented by connecting an external pilot pressure of 25 up to 30 bar at port pSt.

When ordering, state in plain text:

Cracking pressure of pressure relief valve Cracking pressure with pilot pressure applied to pSt (only with version 192)

Version without pressure boost facility (code 191)

Version with pressure boost facility (code 192)

Dimensions

Counterbalance valve BVD and BVE

Function

Travel drive/winch counterbalance valves are designed to reduce the danger of overspeeding and cavitation of axial piston motors in open circuits. Cavitation occurs if the motor speed is greater than it should be for the given input flow while braking, travelling downhill, or lowering a load.

If the inlet pressure drops, the counterbalance spool throttles the return flow and brakes the motor until the inlet pressure returns to approx. 20 bar.

Note

BVD available for sizes 28 to 180 and BVE available for sizes 107 to 180. The counterbalance valve must be ordered additionally. We recommend ordering the counterbalance valve and the motor as a set. Ordering example: A2FM(E)90/61W–VAB188 + BVD20F27S/41B–V03K16D0400S12 The counterbalance valve does not replace the mechanical service brake and park brake. Observe the detailed notes on the BVD counterbalance valve in data sheet 95522 and BVE counterbalance valve in data sheet 95525! For the design of the brake release valve, we must know for the mechanical park brake: the pressure at the start of opening the volume of the counterbalance spool between minimum stroke (brake closed) and maximum stroke (brake released with 21 bar) the required closing time for a warm device (oil viscosity approx. 16 mm2/s)

Travel drive counterbalance valve BVD...F

Application option:

Travel drive on wheeled excavators

Counterbalance valve BVD and BVE

Function

If the inlet pressure drops, the counterbalance spool throttles the return flow and brakes the motor until the inlet pressure returns to approx. 20 bar.

Note

Travel drive counterbalance valve BVD...F

Application option:

Travel drive on wheeled excavators

Example schematic for travel drive on wheeled excavators

A2FM(E)090/61W-VAB188 + BVD20F27S/41B–V03K16D0400S12

Example schematic for travel drive on wheeled excavators

A2FM(E)090/61W-VAB188 + BVD20F27S/41B–V03K16D0400S12

Winch counterbalance valve BVD...W and BVE

Application options:

Winch drive in cranes (BVD and BVE) Track drive in excavator crawlers (BVD)

Winch counterbalance valve BVD...W and BVE

Application options:

Winch drive in cranes (BVD and BVE) Track drive in excavator crawlers (BVD)

Example schematic for winch drive in cranes
A2FM(E)090/61W-VAB188 + BVE25W385/51ND-V100K00D4599T30S00-0

Dimensions

Speed sensors

The versions A2FM...U and A2FM...F ("prepared for speed sensor", i.e. without sensor) are equipped with a toothed ring on the rotary group.

On deliveries "prepared for speed sensor", the port is plugged with a pressure-resistant cover.

With the DSA or HDD speed sensor mounted a signal proportional to motor speed can be generated. The sensors measures the speed and direction of rotation.

Ordering code, technical data, dimensions and details on the connector, plus safety information about the sensor can be found in the relevant data sheet.

DSA: data sheet 95133

HDD: data sheet 95135

The sensor is mounted at the specially provided port as follows:

DSA: with one mounting bolt

HDD: with two mounting bolts

We recommend ordering the A2FM fixed motor complete with sensor mounted.

Speed sensors

The versions A2FM...U and A2FM...F ("prepared for speed sensor", i.e. without sensor) are equipped with a toothed ring on the rotary group.

On deliveries "prepared for speed sensor", the port is plugged with a pressure-resistant cover.

With the DSA or HDD speed sensor mounted a signal proportional to motor speed can be generated. The sensors measures the speed and direction of rotation.

Ordering code, technical data, dimensions and details on the connector, plus safety information about the sensor can be found in the relevant data sheet.

DSA: data sheet 95133

HDD: data sheet 95135

The sensor is mounted at the specially provided port as follows:

DSA: with one mounting bolt

HDD: with two mounting bolts

We recommend ordering the A2FM fixed motor complete with sensor mounted.

DSA speed sensor mounted (code V)

Size 23 … 200

DSA speed sensor mounted (code V)

Size 23 … 200

HDD speed sensor mounted (code H)

Size 250 … 500

HDD speed sensor mounted (code H)

Size 250 … 500

Installation information

General information

During commissioning and during operation, the axial piston unit must be filled with hydraulic fluid and bled. This must also be observed during longer standstill as the axial piston unit might drain itself via the hydraulic lines. Complete filling and bleeding must especially be ensured with the “Drive shaft upwards” installation position as there is, for example, the risk of running dry. The leakage in the housing area must be discharged to the tank via the highest-located drain port (T1, T2). If one joint drain line is used for several units, it is to be ensured that the relevant housing pressure is not exceeded. The joint drain line must be dimensioned so that the maximum admissible housing pressure of all connected units is not exceeded in any operating state, particularly during cold start. If this is not possible, separate drain lines have to be laid, if necessary. In order to achieve favorable noise values, all connection lines are to be decoupled using elastic elements and over-tank installation is to be avoided. The tank line must lead into the tank below the minimum liquid level in every operating state.

Installation position

See the following examples 1 to 8.

Further installation positions are possible upon request. Recommended installation position: 1 and 2.

Note

For installation position 4 and 8 "shaft upwards" an air bleed port R is required (specify in plain text when ordering, special version).

With sizes 250 to 1000, port U is provided as standard in the area near the bearings for air bleeding.

Below-tank installation (standard)

Below-tank installation is at hand if the axial piston unit is installed below the minimum liquid level outside the tank.

Installation position	Air bleeding	Filling
1	‒	T1
2	‒	T2
3	‒	T1
4	R (U)	T2

Above-reservoir installation

Above-reservoir installation means that the axial piston unit is installed above the minimum fluid level of the reservoir.

Recommendation for installation position 8 (drive shaft upward): A check valve in the drain line (cracking pressure 0,5 bar) can prevent draining of the pump housing.

Installation position	Air bleeding	Filling
5	F	T1 (F)
6	F	T2 (F)
7	F	T1 (F)
8	R (U)	T2 (F)

Key
F	Filling / Air bleeding
R	Air bleed port
U	Bearing flushing / air bleed port
T1, T2	Tank port
ht min	Minimum required immersion depth (200 mm)
hmin	Minimum required spacing to reservoir bottom (100 mm)

	Note: Connection F is part of the external piping and must be provided on the customer side to simplify the filling and bleeding.

General project planning notes

The axial piston unit is designed to be used in open and closed circuits. The project planning, installation and commissioning of the axial piston unit require the involvement of qualified skilled personnel. Before using the axial piston unit, please read the corresponding instruction manual completely and thoroughly. If necessary, request it from Bosch Rexroth. Before finalizing your design, request a binding installation drawing. The specified datas and notes must be observed. Preservation: Our axial piston units are supplied as standard with preservative protection for a maximum of 12 months. If longer preservative protection is required (maximum 24 months), please specify this in plain text when placing your order. The preservation times are valid under optimal storage conditions. Details of these conditions can be found in the data sheet 90312 or the instruction manual. Not all versions of the product are approved for use in a safety function according to ISO 13849. Please consult the responsible contact person at Bosch Rexroth if you require reliability parameters (e.g. MTTFD) for functional safety. A pressure relief valve is to be provided in the hydraulic system. Observe the instructions in the instruction manual regarding tightening torques of connection threads and other threaded joints used. The notes in the instruction manual on tightening torques of the port threads and other screw joints must be observed. The ports and fastening threads are designed for the permissible maximum pressure pmax (see instruction manual). The machine or system manufacturer must ensure that the connecting elements and lines correspond to the specified operating conditions (pressure, flow, hydraulic fluid, temperature) with the necessary safety factors. The working ports and function ports are designated only to accommodate hydraulic lines.

During and shortly after operation, there is a risk of burns on the axial piston unit. Take appropriate safety measures (e.g. by wearing protective clothing).