Rexroth A2FO/125 61R-VAB05 Pump

This article is about the Rexroth A2FO/125 61R-VAB05 Pump, which is a new pump with a hydraulic design. This means that it uses the pressure and flow created to provide power to a piston that then turns the pump’s output shaft.

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Features

Type code

Dimensions

Technical data

Rexroth A2FO/125 61R-VAB05 Pump Service Manual

Features

Robust pump with long service life
Very high total efficiency
High power density
Large variety of available nominal sizes allows exact adjustment to the application
Optional with long-life bearings for the nominal sizes 250 to 1000
Bent-axis design

Type code

Dimensions

Working port	Size	M18 × 15; 12 mm deep
	Standard 1)	DIN 3852
	State on delivery	With protective cover (must be connected)
Suction port	Size	M22 × 15; 14 mm deep
	Standard 1)	DIN 3852
	State on delivery	With protective cover (must be connected)
Drain port	Size	M10 × 1; 8 mm deep
	Standard 1)	DIN 3852
	State on delivery 2)	Plugged (observe installation instructions)
Drain port	Size	M10 × 1; 8 mm deep
	Standard 1)	DIN 3852
	State on delivery 2)	With protective cover (observe installation instructions)

Technical data

Table of values

Displacement geometric, per revolution		Vg	cm³	4.93	10.3	12	16	22.9	28.1	32	45.6	56.1	63	80.4	90	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	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	450	450	450	450	450	400	400	400	400	400
Maximum speed		nnom 1)	rpm	5600	3150	3150	3150	2500	2500	2500	2240	2000	2000	1800	1800	1600	1600	1450	1450	1550	1500	1320	1200	1200	950
Maximum speed		nmax 2)	rpm	8000	6000	6000	6000	4750	4750	4750	4250	3750	3750	3350	3350	3000	3000	2650	2650	2750	1800	1600	1500	1500	1200
Flow	at nnom	qV	l/min	27.6	32	38	50	57	70	80	102	112	126	145	162	171	200	233	261	310	375	469	600	852	950
Power	at nnom and pnom	P	kW	14.5	22	25	34	38	47	53	68	75	84	96	108	114	133	155	174	207	219	273	350	497	554
Torque 3)	at pnom	M	Nm	24.7	66	76	102	146	179	204	290	357	401	512	573	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	4.18	5.94	6.25	8.73	9.14	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	0.0024	0.0042	0.0042	0.0072	0.0072	0.0116	0.0116	0.022	0.022	0.0353	0.061	0.102	0.178	0.55	0.55
Case volume		V	l		0.17	0.17	0.17	0.2	0.2	0.2	0.33	0.45	0.45	0.55	0.55	0.8	0.8	1.1	1.1	2.7	2.5	3.5	4.2	8	8
Weight (approx.)		m	kg	2.5	6	6	6	9.5	9.5	9.5	13.5	18	18	23	23	32	32	45	45	66	73	110	155	325	336

1) The values are applicable:
– at an abs. pressure pabs = 1 bar at the suction port S
– for the optimum viscosity range of vopt = 36 to 16 mm2/s
– with hydraulic fluid on the basis of mineral oils
2) Maximum speed (limiting speed) with increased inlet pressure pabs at suction port S, see the following diagram.
3) Torque without radial force, with radial force see table “Permissible radial and axial forces of the drive shafts”

Maximum speed

Viscosity and temperature of hydraulic fluids


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 • pnommeasured at port T
Short-term operation	νmin = 7 … 10 mm²/s	FKM	ϑ ≤ +103 °C	t ≤ 3 min, p ≤ 0.3 • pnommeasured 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)

Selection diagram

Operating pressure range

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.
Rate of pressure change	RA max	16000 bar/s	Maximum permissible rate of pressure build-up and reduction during a pressure change over the entire pressure range.
Minimum pressure	ps min	0.8 bar absolute	Minimum pressure at inlet (suction port S) that is required to avoid damage to the axial piston unit. The minimum required pressure is dependent on the speed of the axial piston unit. (see diagram “Maximum speed”)
Maximum pressure	ps max	30 bar absolute
Continuous differential pressure	ΔpT cont	2 bar	Maximum averaged differential pressure at the shaft seal (case to ambient pressure)
Maximum differential pressure	ΔpT max	see diagram “Maximum differential pressure at the shaft seal”	Intermittent differential pressure at the shaft seal (permitted at reduced speed)
Pressure peaks	pT peak	10 bar	t < 0.1 s