A2FMM080/70AWVC4V811000-0

Manufacturer: Bosch Rexroth

Material #: R902249816

Model : A2FMM080/70AWVC4V811000-0

***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 A2FMM080/70AWVC4V811000-0 (R902249816) is a compact high-pressure motor characterized by its robust bent-axis technology and exceptional power density. Designed for both open and closed circuit applications, this metric version motor offers a nominal pressure of up to 400 bar and can withstand maximum pressure levels of up to 450 bar. The A2FMM080/70AWVC4V811000-0 is engineered to meet diverse customer requirements through its adaptable pressure ranges, ensuring suitability for a wide range of applications. This motor is noted for its very high total efficiency and impressive starting efficiency, which contribute to its overall performance and reliability. The bent-axis design ensures that the motor remains compact with a short installation length, making it an ideal choice for systems where space is at a premium. Additionally, it comes with an optional integrated flushing valve, enhancing its functionality and extending the motor's operational lifespan by ensuring proper heat dissipation. With these capabilities, the Bosch Rexroth A2FMM080/70AWVC4V811000-0 stands out as a powerhouse in hydraulic systems requiring durable and efficient motors. It provides users with the assurance of consistent performance even under demanding conditions, making it a key component in driving hydraulic machinery with precision and strength.

$5,913.00 USD

Availability: 12 In Stock

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Available for immediate shipment

Qty: Delivered as early as December 24, 2024 when ordered in

3 pressure ranges to fit to different customer requirements and applications Very high power density Very high total efficiency High starting efficiency Robust 40° bent-axis technology Optional with integrated flushing valve Bent-axis design

1)	Only available for A2FMN
2)	Not available for A2FMH
3)	Not available for A2FMN

1)	Not available for A2FMH

Table of values

Size				56	63	80	90	107	45	56	63	80	90	45	56	63	80	90
Version				A2FMN					A2FMM					A2FMH
Displacement geometric, per revolution		Vg	cm³	56.6	63	81.7	90.5	108.8	44.9	56.6	63	79.8	90.5	44.9	56.6	63	79.8	90.5
Nominal pressure		pnom	bar	300	300	300	300	300	400	400	400	400	400	450	450	450	450	450
Maximum pressure		pmax	bar	350	350	350	350	350	450	450	450	450	450	500	500	500	500	500
Maximum speed		nnom 1)	rpm	3750	3750	3375	3375	3000	5000	5000	5000	4500	4500	5000	5000	5000	4500	4500
Maximum speed		nmax 2)	rpm	4125	4125	3700	3700	3300	5500	5500	5500	5000	5000	5500	5500	5500	5000	5000
Inlet flow	at nnom	qV	l/min	212	236	276	305	326	225	283	315	359	407	225	283	315	359	407
Torque 3)	at pnom	M	Nm	270	301	390	432	519	286	360	401	508	576	322	405	451	571	648
Rotary stiffness		c	kNm/rad	6.83	8.09	7.94	9.84	10.9	4.52	6.83	8.09	9.09	9.84	4.52	6.83	8.09	9.09	9.84
Moment of inertia for rotary group		JTW	kg·m²	0.0032	0.0032	0.0034	0.0054	0.0061	0.0032	0.0032	0.0032	0.0058	0.0054	0.0032	0.0032	0.0032	0.0058	0.0054
Maximum angular acceleration		ɑ	rad/s²	10000	12200	19800	4500	6000	5400	9000	11100	4500	4500	5000	8550	10500	4500	4500
Case volume		V	l	0.6	0.6	0.6	0.65	0.65	0.6	0.6	0.6	0.65	0.65	0.6	0.6	0.6	0.65	0.65
Weight (approx.)		m	kg	17	17	17	23	23	17	17	17	23	23	17	17	17	23	23

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)	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-resistant, water-containing hydraulic fluids (HFAE, HFAS, HFB, HFC)

The axial piston unit is not suitable for operation with HFA hydraulic fluid.

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).

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

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			56		63	80	90	107	45	56		63	80		90	45	56		63	80		90
Version			A2FMN						A2FMM							A2FMH
Drive shaft	Code		Z6/P6	Z8/P8	Z8/P8	Z8/P8	Z9/P9	Z9/P9	Z6/P6	Z6/P6	Z8/P8	Z8/P8	Z8/P8	Z9/P9	Z9/P9	Z6/P6	P6	Z8/P8	Z8/P8	Z8/P8	Z9/P9	Z9/P9
Drive shaft	⌀	mm	30	35	35	35	40	40	30	30	35	35	35	40	40	30	30	35	35	35	40	40
Maximum radial force at distance a (from shaft collar)	Fq max		7.1 kN	6.1 kN	6.9 kN	8.7 kN	8.6 kN	10.4 kN	7.6 kN	9.5 N	8.1 N	9.2 N	11.6 N	10.2 N	11.5 N	8.6 N	10.7 N	9.2 N	10.3 N	13.1 N	10.2 N	11.5 N
Maximum radial force at distance a (from shaft collar)	a	mm	18	18	18	18	20	20	18	18	18	18	20	20	20	18	18	18	18	20	20	20
Permitted torque at Fq max	Tq max	Nm	270	270	301	390	432	519	286	360	360	401	508	508	576	322	405	405	451	571	571	645
Permitted differential pressure at Fq max	Δpq max	bar	300	300	300	300	300	300	400	400	400	400	400	400	400	450	450	450	450	450	450	450
Maximum axial force, when standstill or in non-pressurized conditions	+ Fax max	N	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	- Fax max	N	800	800	800	800	1000	1000	800	800	800	800	1000	1000	1000	800	800	800	800	1000	1000	1000
Maximum axial force, per bar operating pressure	+ Fax max	N/bar	8.7	8.7	8.7	8.7	10.6	10.6	8.7	8.7	8.7	8.7	10.6	10.6	10.6	8.7	8.7	8.7	8.7	10.6	10.6	10.6

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.

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

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

Port plate 11

SAE working ports at bottom

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

Version	Size	D1		D3	D4	D7	D8	D9	D10	D11	D12	D13	D14	D15	D17	D18	D19	D20	D25	D26	D29	D33	D40	D41	D42	D46	D47
Version	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	mm
A2FMN	56	125	- 0.025	172.7	122	160	20	10	32	30	86	148.7	125	148.7	30	126.2	121.5	93.2	150	145	13.5	147	23.8	50.8	19	75	25
	63	125	- 0.025	172.7	122	160	20	10	32	30	86	148.7	125	148.7	30	126.2	121.5	93.2	150	145	13.5	147	23.8	50.8	19	75	25
	80	125	- 0.025	172.7	122	160	20	10	32	30	86	148.7	125	148.7	30	126.2	121.5	93.2	150	145	13.5	147	23.8	50.8	19	75	25
	90	140	- 0.025	198.5	142	180	20	10	32	29	101.5	171.5	145	171.5	30	145.5	127	111	165	160	13.5	165	27.8	57.2	25	84	25
	107	140	- 0.025	198.5	142	180	20	10	32	29	101.5	171.5	145	171.5	30	145.5	127	111	165	160	13.5	165	27.8	57.2	25	84	25
A2FMM	45	125	- 0.025	172.7	122	160	20	10	32	30	86	148.7	125	148.7	30	126.2	121.5	93.2	150	145	13.5	147	23.8	50.8	19	75	25
	56	125	- 0.025	172.7	122	160	20	10	32	30	86	148.7	125	148.7	30	126.2	121.5	93.2	150	145	13.5	147	23.8	50.8	19	75	25
	63	125	- 0.025	172.7	122	160	20	10	32	30	86	148.7	125	148.7	30	126.2	121.5	93.2	150	145	13.5	147	23.8	50.8	19	75	25
	80	140	- 0.025	198.5	142	180	20	10	32	29	101.5	171.5	145	171.5	30	145.5	127	111	165	160	13.5	165	27.8	57.2	25	84	25
	90	140	- 0.025	198.5	142	180	20	10	32	29	101.5	171.5	145	171.5	30	145.5	127	111	165	160	13.5	165	27.8	57.2	25	84	25
A2FMH	45	125	- 0.025	172.7	122	160	20	10	32	30	86	148.7	125	148.7	30	126.2	121.5	93.2	150	145	13.5	147	23.8	50.8	19	75	25
	56	125	- 0.025	172.7	122	160	20	10	32	30	86	148.7	125	148.7	30	126.2	121.5	93.2	150	145	13.5	147	23.8	50.8	19	75	25
	63	125	- 0.025	172.7	122	160	20	10	32	30	86	148.7	125	148.7	30	126.2	121.5	93.2	150	145	13.5	147	23.8	50.8	19	75	25
	80	140	- 0.025	198.5	142	180	20	10	32	29	101.5	171.5	145	171.5	30	145.5	127	111	165	160	13.5	165	27.8	57.2	25	84	25
	90	140	- 0.025	198.5	142	180	20	10	32	29	101.5	171.5	145	171.5	30	145.5	127	111	165	160	13.5	165	27.8	57.2	25	84	25

Port plate 02

SAE working ports at side, opposite

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

Version	Size	D1		D3	D4	D7	D8	D9	D10	D11	D12	D13	D14	D15	D17	D18	D19	D20	D25	D26	D29	D33	D40	D41	D42	D46	D47
Version	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	mm
A2FMN	56	125	- 0.025	172.7	127.5	160	20	10	32	30	86	148.7	125	148.7	30	126.2	123	93.2	150	145	13.5	141	23.8	50.8	19	75	25
	63	125	- 0.025	172.7	127.5	160	20	10	32	30	86	148.7	125	148.7	30	126.2	123	93.2	150	145	13.5	141	23.8	50.8	19	75	25
	80	125	- 0.025	172.7	127.5	160	20	10	32	30	86	148.7	125	148.7	30	126.2	123	93.2	150	145	13.5	141	23.8	50.8	19	75	25
	90	140	- 0.025	198.5	148.5	180	20	10	32	29	101.5	171.5	145	171.5	30	145.5	127	111	165	160	13.5	159	27.8	57.2	25	84	25
	107	140	- 0.025	198.5	148.5	180	20	10	32	29	101.5	171.5	145	171.5	30	145.5	127	111	165	160	13.5	159	27.8	57.2	25	84	25
A2FMM	45	125	- 0.025	172.7	127.5	160	20	10	32	30	86	148.7	125	148.7	30	126.2	123	93.2	150	145	13.5	141	23.8	50.8	19	75	25
	56	125	- 0.025	172.7	127.5	160	20	10	32	30	86	148.7	125	148.7	30	126.2	123	93.2	150	145	13.5	141	23.8	50.8	19	75	25
	63	125	- 0.025	172.7	127.5	160	20	10	32	30	86	148.7	125	148.7	30	126.2	123	93.2	150	145	13.5	141	23.8	50.8	19	75	25
	80	140	- 0.025	198.5	148.5	180	20	10	32	29	101.5	171.5	145	171.5	30	145.5	127	111	165	160	13.5	159	27.8	57.2	25	84	25
	90	140	- 0.025	198.5	148.5	180	20	10	32	29	101.5	171.5	145	171.5	30	145.5	127	111	165	160	13.5	159	27.8	57.2	25	84	25
A2FMH	45	125	- 0.025	172.7	127.5	160	20	10	32	30	86	148.7	125	148.7	30	126.2	123	93.2	150	145	13.5	141	23.8	50.8	19	75	25
	56	125	- 0.025	172.7	127.5	160	20	10	32	30	86	148.7	125	148.7	30	126.2	123	93.2	150	145	13.5	141	23.8	50.8	19	75	25
	63	125	- 0.025	172.7	127.5	160	20	10	32	30	86	148.7	125	148.7	30	126.2	123	93.2	150	145	13.5	141	23.8	50.8	19	75	25
	80	140	- 0.025	198.5	148.5	180	20	10	32	29	101.5	171.5	145	171.5	30	145.5	127	111	165	160	13.5	159	27.8	57.2	25	84	25
	90	140	- 0.025	198.5	148.5	180	20	10	32	29	101.5	171.5	145	171.5	30	145.5	127	111	165	160	13.5	159	27.8	57.2	25	84	25

Drive shafts

Overview of available drive shafts

Splined shaft DIN 5480

1)	Center bore according to DIN 332 (thread according to DIN 13)
2)	For size 80, pressure range "M" and "H": ⌀45 mm

Parallel keyed shaft DIN 6885

1)	Center bore according to DIN 332 (thread according to DIN 13)
2)	For size 80, pressure range "M" and "H": ⌀45 mm

Ports

Size			56	63	80	90	107	45	56	63	80	90	45	56	63	80	90
Version			A2FMN					A2FMM					A2FMH
A, B	Working port	Size	3/4 in			1 in		3/4 in			1 in		3/4 in			1 in
		Standard	Dimensions according to SAE J518
		Fastening thread	M10 × 1,5; 17 mm deep			M12 × 1,75; 17 mm deep		M10 × 1,5; 17 mm deep			M12 × 1,75; 17 mm deep		M10 × 1,5; 17 mm deep			M12 × 1,75; 17 mm deep
		State on delivery	With protective cover (must be connected)
T1	Drain port	Size	M18 × 1,5; 12 mm deep
		Standard 1)	DIN 3852
		State on delivery 2)	Plugged (observe installation instructions)
T2	Drain port	Size	M18 × 1,5; 12 mm deep
		Standard 1)	DIN 3852
		State on delivery 2)	With protective cover (observe installation instructions)

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

A2FMN

Size		56		63	80	90	107
Drive shafts	Code	Z6/P6	Z8/P8	Z8/P8	Z8/P8	Z9/P9	Z9/P9

A2FMM

Size		45	56		63	80		90
Drive shafts	Code	Z6/P6	Z6/P6	Z8/P8	Z8/P8	Z8/P8	Z9/P9	Z9/P9

A2FMH

Size		45	56		63	80		90
Drive shafts	Code	Z6/P6	P6	Z8/P8	Z8/P8	Z8/P8	Z9/P9	Z9/P9

Flushing and boost-pressure valve

In a closed circuit, the integrated flushing and boost-pressure valve is used for heat dissipation and to safeguard the minimum boost pressure.

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 supplied by the boost pump.

Cracking pressure of pressure retention valve

(observe when setting the primary valve)

fixed setting: 16 bar

Switching pressure of flushing spool Δp

8±1 bar

Circuit diagram

Flushing flow qv

Orifices can be used to adjust the flushing flows as required. The following information is based on:
ΔpND = pND – pG = 25 bar und ν = 10 mm2/s

(pND = low pressure, pG = case pressure)

Size	Flushing flow qv	Orifice-⌀
Size	l/min	mm
all	2.6	1.0
	6	1.5
	7.4	1.7
	8,5	1.8
	11.4	2.3
	12.5	3

Pressure relief valve

The MHDB pressure relief valves (see data sheets 64602 and 64612) 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 the working ports 07 and 09 (for the counterbalance valve for mounting to working ports 07 see next page).

Setting range of cracking pressure: 50 up to 420 bar

For versions “with pressure sequencing stage” 09S, 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 09S)

Version without pressure boost facility 09R

Version with pressure boost facility 09S

Permissible input flow or pressure in case of port plate with pressure-relief valves

Size		Code	pnom	pmax	qV
Motor	MHDB	Code	bar	bar	l/min
45 … 90	22	09R, 09S	350	420	240

Dimensions

Size		D3	D14	D16	D17	D18	D19	D20	D38	D39	D40	D41	D42	D46
Motor	MHDB	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
45, 56, 63	22	206	120	74	32.5	182	75	163	137	130	23.8	50.8	19	75
80, 90	22	225.5	128	73	31.5	203	80	184.5	127	145	27.8	57.2	25	75

Ports

Size			45, 56, 63	80, 90
A, B	Working port	Size	3/4 in	1 in
A, B	Working port	Standard	Dimensions according to SAE J518
S1	Boost port (only for working ports 09R/09S)	Size	M22 × 1.5; 14 mm deep	M26 × 1.5; 16 mm deep
		Standard 1)	DIN 3852
		State on delivery	With protective cover (must be connected)
PSt	Pilot pressure port (only for working ports 09S)	Size	G 1/4
MA, MB	Measuring port pressure A, B	Size	M20 × 1.5; 14 mm deep
		Standard 1)	DIN 3852
		State on delivery	Plugged

1)	The spot face can be deeper than specified in the appropriate standard.

Counterbalance valve BVD

Function

Counterbalance valves for travel drives and winches should reduce the danger of overspeed and cavitation of axial piston motors in open circuits. Cavitation occurs if, during braking, when going downhill or during the load-lowering process, the motor speed is greater than it should be for the given inlet flow and thus the supply pressure falls sharply.

If the supply pressure falls below the level specified for the relevant counterbalance valve, the counterbalance spool moves into the closed position. The cross-sectional area of the counterbalance valve return passage is then reduced, creating a bottleneck in the return flow of the hydraulic fluid. The pressure increases and brakes the motor until the rotational speed of the motor reaches the specified value for the given inlet flow.

Notice

BVD available in sizes 45 to 90. The counterbalance valve must be ordered additionally. We recommend ordering the counterbalance valve and the motor as a set. Order example: A2FMM90/70NWVN4Z907W000 + BVD20F27S/41B–V03K16D0400S12 The counterbalance valve does not replace the mechanical service brake and holding brake. Observe the detailed notes on the BVD counterbalance valve contained in data sheet 95522 For the design of the brake release valve, we must know the following data for the mechanical holding brake: the cracking pressure the volume of the brake 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. 15 mm2/sec)

Permissible input flow or pressure in case of port plate with counterbalance valves

Size		Code	pnom	pmax	qV
Motor	BVD	Code	bar	bar	l/min
45 … 90	20	07W	350	400	220

Fahrbremsventil BVD..F

Anwendungsmöglichkeit:

Fahrantrieb bei Mobilbaggern

Example schematic for travel drive on wheeled excavators

A2FMM90/70NWVN4Z907W000 + BVD20F27S/41B–V03K16D0400S12

BVD...W winch counterbalance valve

Application possibilities:

Winch drives in cranes (BVD) Track drive in excavator crawlers (BVD)

Example circuit diagram for winch drive in cranes

A2FMM90/70NWVN4Z907W000 + BVD20W27L/41B-V01K00D0600S00

Dimensions

Size		D3	D14	D17	D20	D33	D34	D35	D46
Motor	Counterbalance valve	mm	mm	mm	mm	mm	mm	mm	mm
45, 56, 63	BVD20..17	205	193	32.5	163	98	139	140.5	75
80, 90	BVD20..17	226.5	201	31.5	184.5	98	139	140.5	75

Ports

Size			45, 56, 63	80, 90
A, B	Working port	Size	3/4 in	1 in
A, B	Working port	Standard	Dimensions according to SAE J518
S	Boost port	Size	M22 × 1.5; 14 mm deep
		Standard 1)	DIN 3852
		State on delivery	Plugged
Br	Brake release port (only BV...L)	Size	M12 × 1.5
		Standard 1)	DIN 3852
		State on delivery	With protective cover (must be connected)
Gext	Brake release port (only BV...S)	Size	M12 × 1.5
		Standard 1)	DIN 3852
		State on delivery	Plugged
MA, MB	Measuring port pressure A, B	Size	M12 × 1,5; 12 mm deep
		Standard 1)	DIN 3852
		State on delivery	Plugged

1)	The spot face can be deeper than specified in the appropriate standard.

Mounting the counterbalance valve

When delivered, the counterbalance valve is fastened to the motor with two tacking screws (transport lock). The tacking screws may not be removed while mounting the working lines. If the counterbalance valve and motor are delivered separately, the counterbalance valve must first be fastened to the motor connection plate using the provided tacking screws. The counterbalance valve is finally mounted to the motor by fitting the SAE flange.

The screws to be used and the instructions for mounting can be found in the instruction manual.

Speed sensors DSA and DSM

The speed sensors DSA respectively DSM scan contactless a specific spline on the rotary group and thus generate an output signal with constant amplitude and a frequency proportional to the motor speed. In addition to the speed also the direction of rotation is detected. The sensor is mounted on the port provided for this purpose with one mounting bolt.

The versions A2F...A and A2F...N (“prepared for speed sensor”, i.e. without sensor) is equipped with the splines on the rotary group needed for future speed measurement. On deliveries without sensor, the port is plugged with a pressure-resistant cover.

Technical data and further specifications of the sensor can be found in the relevant data sheets 95133 (DSA) respectively 95132 (DSM).

We recommend ordering the fixed motor A2F complete with mounted sensor.

DSA speed sensor mounted

Motor		Number of teeth	N1	N3	N4
Version	Size	Number of teeth	mm	mm	mm
A2FMN	56 … 80	47	32	96.6	54.6
A2FMN	90 … 107	53	32	108.4	58.8
A2FMM A2FMH	45 … 63	47	32	96.6	54.6
A2FMM A2FMH	80 … 90	53	32	108.4	58.8

DSM speed sensor mounted (code M)

Motor		Number of teeth	N1	N2	N3	N4
Version	Size	Number of teeth	mm	mm	mm	mm
A2FMN	56 … 80	47	18.4	94.8	61.2	70.3
A2FMN	90 … 107	53	18.4	99.5	72.6	75
A2FMM A2FMH	45 … 63	47	18.4	94.8	61.2	70.3
A2FMM A2FMH	80 … 90	53	18.4	99.5	72.6	75

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).

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	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	T2 (F)

Key
F	Filling / Air bleeding
R	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.

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).

A2FMM080/70AWVC4V811000-0

Manufacturer: Bosch Rexroth

Material #: R902249816

Model : A2FMM080/70AWVC4V811000-0

Availability: 12 In Stock

Table of values

Note

Speed range

Hydraulic fluids

Viscosity and temperature of hydraulic fluids

Note

Selection of hydraulic fluid

Selection diagram

Filtration of the hydraulic fluid

Operating pressure range

Note

Minimum pressure at inlet (pump operating mode)

Pressure definition

Rate of pressure change

Note

Direction of flow

Permissible radial and axial forces of the drive shaft

General instructions

Effect of radial force Fq on the service life of bearings

Toothed gear drive

Port plate 11

Port plate 02

Drive shafts

Overview of available drive shafts

Splined shaft DIN 5480

Parallel keyed shaft DIN 6885

Ports

A2FMN

A2FMM

A2FMH

Flushing and boost-pressure valve

Cracking pressure of pressure retention valve

Switching pressure of flushing spool Δp

Circuit diagram

Flushing flow qv

Pressure relief valve

Version without pressure boost facility 09R

Version with pressure boost facility 09S

Permissible input flow or pressure in case of port plate with pressure-relief valves

Dimensions

Counterbalance valve BVD

Function

Notice

Fahrbremsventil BVD..F

Example schematic for travel drive on wheeled excavators

BVD...W winch counterbalance valve

Example circuit diagram for winch drive in cranes

Dimensions

Ports

Mounting the counterbalance valve

Speed sensors DSA and DSM

DSA speed sensor mounted

DSM speed sensor mounted (code M)

Installation information

General information

Installation position

Below-tank installation (standard)

Above-reservoir installation

Note

General project planning notes

Related Products

Information

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