🔍

Mobile Hydraulic Variable Pump OEM A4VSO

Mobile Hydraulic Variable Pump OEM A4VSO

1.Variable pump with axial piston rotary group of swashplate design for hydrostatic drives in open circuit

2.Flow is proportional to the drive speed and displacement.

3.The flow can be infinitely varied by adjusting the swashplate angle.

4.Excellent suction performance

5.Suitable for variable-speed drives

6.HF mode for reduced data possible for HFC mode, special version available

Detailed description

This is a variable pump equipped with an axial piston rotary group of swashplate design, specifically tailored for hydrostatic drive systems in open circuits, suitable for a variety of industrial and mobile hydraulic application scenarios. The output flow of the pump is strictly proportional to its drive speed and displacement, ensuring stable and predictable hydraulic output that matches the system’s working demands. By precisely adjusting the swashplate angle, the flow can be infinitely and steplessly varied, allowing flexible adaptation to different flow regulation requirements during operation. It boasts excellent suction performance, enabling stable oil absorption even under conventional working conditions, which effectively avoids cavitation and ensures continuous and reliable operation of the pump. The pump is also suitable for variable-speed drives, adapting well to changes in drive speed without compromising performance or stability. Additionally, it supports HF mode for reduced data when in HFC mode, and a special version is available to meet specific application needs of different hydraulic systems.

ORDER CODE

1.Hydraulic fluid / version

Size	40	71	125	180	250	300	355	370	500
Mineral oil (no code)	√	√	√	√	√	√	√	√	△
HF hydraulic fluid (with the exception of skydrol)	√	√	√	√	√	√	√	√	△	E
High- Speed-Version		▲	▲	▲	√	√	√	√	△	H

2.Axial piston unit

Swashplate design, variable, for industrial applications

A4VS

3.Boost pump (Impeller)

Size	40	71	125	180	250	300	355	370	500
	△	△	△	√	√	√	√	△	△	L

4.Type of operation

Pump,open circuit

○

5.Nominal size

displacement V_g_max(cm³/r)	40	71	125	180	250	300	355	370	500
	√	√	√	√	√	√	√	√	△

6.Control device

Size		40	71	125	180	250	300	355	370	500
Pressure control	DR	√	√	√	√	√	√	√	√	△
Flow control	FR	√	√	√	√	√	√	√	√	△
Power control with hyperbolic curve	LR	√	√	√	√	√	√	√	√	△
Manual control	MA	√	√	√	√	√	√	√	√	△
Electric Motor Control	EM	△	△	△	△	△	△	△	△	△
Hydraulic control,control position dependent	HW	△	△	△	△	△	△	△	△	△
Hydraulic control,control volume dependent	HM	√	√	√	√	√	√	√	√	△
Hydraulic control,with servo /proportional valve HS	HS	√	√	√	√	√	√	√	√	△
Electronic control	EO	√	√	√	√	√	√	√	√	△
Hydraulic control,and stress related	HD	△	△	△	△	△	△	△	△	△
Speed control,the two control	DS	△	△	△	△	△	△	△	△	△

7.Series

Size	40	71	125	180	250	300	355	370	500
10 Series	√	√	▲	▲	▲	▲	▲	▲	▲
20 Series	▲	▲	√	√	√	√	√	√	▲
30 Series	▲	▲	√	√	√	√	√	√	△

8.Direction of rotation

Viewed on shaft end	clockwise	R
Viewed on shaft end	anti-clockwise	L

9.Seals

Nitrile rubber NBR(DIN 1629)	P
Fluorine rubber FRM(DIN ISO 1629)	V

10.Shaft end

Keyed parallel shaft DIN 6885	P
Splined shaft DIN 5480	Z

√=available △=in preparation ▲=not available

11.Mounting flange

Size	40	71	125	180	250	300	355	370	500
IS04 hole	√	√	√	√	√	√	√	√	▲	B
IS08 hole	▲	▲	▲	▲	▲	▲	▲	▲	△	H

12.Oil port B & S position

	40	71	125	180	250	300	355	370	500
Oil port B and S are at the side of SAE,the angle of 90°,with fixed thread	√	√	√	√	√	√	√	√	△	13
Secondary pressure oil port B1 is at the opposite of port B. they should be jammed with flanges in supply	√	√	√	√	√	√	√	√	△	25

Complete shaft drive

No auxiliary pumps,No complete shaft drive

√

Complete shaft drive can be connected to the piston,the gear pumps or the radial piston pumps

Flange

shaft sleeve/shaft

connectable

ISO 125,4-hole

Spline shaft 32x2x30x14x9g

A4VSO/H/G 40

√

△

K33

S0 140,4-hole

Spline shaft 40x2x30x18x9g

A4VSO/H/G 71

▲

√

△

K33

S0 160,4-hole

Spline shaft 50x2x30x24x9g

A4VS0/H/G 125

▲

√

△

K34

IS0 160.4-hole

Spline shaft 50x2x30x24x9g

A4VSO/G 180

▲

√

△

K34

ISO 224,4-hole

Spline shaft 60x2x30x28x9g

A4VSO/H/G 250

▲

√

△

K35

ISO 224,4-hole

Spline shaft 70x3x30x22x9g

A4VSO/G 355

▲

√

△

K77

IS0315,8-hole

Spline shaft 80x3x30x25x9g

A4VSO/G 500

▲

△

K43

IS0 80,2-hole

Spline 3/4" 19-4(SAE A-B)

A10VSO18

△

√

△

KB2

S0 100,2-hole

Spline 7/8" 22-4(SAE B)

A10VSO28

√

△

KB3

S0 100,2-hole

Spline 1" 25-4(SAE B-B)

A10VS045

▲

△

√

△

KB4

ISO 125.2-hole

Spline 1 1/4" 32-4(SAE C)

A10VS071

▲

△

√

△

KB5

ISO 125.2-hole

Spline 1 1/2" 38-4(SAE C-C)

A10VS0 100

▲

√

△

KB6

IS0 180,4-hole

Spline1 3/4" 44-4(SAE D)

A10VSO 140

▲

△

√

△

KB7

82-2 (SAE A,2-hole)

Spline5/8" 16-4(SAE A)

G2/GC2/GC3-1X

√

△

K01

82-2 (SAE A,2-hole)

Spline3/4" 19-4(SAE A-B)

A10VSO18

√

△

K52

101-2 (SAE B,2-hole)

Spline 7/8" (SAE B)

√

△

K02

101-2 (SAE B)

Spline25-4(SAE B-B)

GC4-1X.A10V045

▲

√

△

K04

127-2(SAE C)

Spline32-4(SAE C)

A10VO71

▲

√

△

K07

101-2 (SAE B)

Spline32-4(SAE C)

GC5-1X

▲

√

△

K06

127-2(SAE C)

Spline38-4(SAE C-C)

GC6-1X,A10VO 100

▲

√

△

K24

152-4 (SAE D)

Spline44-4(SAE D)

A10VO 140

▲

√

△

K17

063,metric 4-hole

Shaft with key025

√

△

K57

101-2(SAE B)

22-4(SAE B)

G4,A10VO 28

√

△

K68

Bandpass shaft,no sleeve,without reducing flange.

√

△

K99

√=available △=in preparation ▲=not available

Technical data

Standard rotary group version

Size		NG		40	71	125	180	250	355	500	750	750⁵⁾	1000
Geometric displacement per revolution		V_{g max}	cm³	40	71	125	180	250	355	500	750	750	1000
Rotational speed maximum¹⁾	at V_{g max}²⁾	n_nom	rpm	2600	2200	1800	1800	1500	1500	1320	1200	1500	1000
Rotational speed maximum¹⁾	at V_g ≤ V_g max³⁾	n_max	rpm	3200	2700	2200	2100	1800	1700	1600	1500	1500	1200
Flow	at n_nom and V_{g max}	q_v	I/min	104	156	225	324	375	533	660	900	1125	1000
Flow	at 1500 rpm	q_v	I/min	60	107	186	270	375	533	581⁶⁾	770⁶⁾	1125	-
Power	With n_nom, V_{g max} and Δp = 350 bar	P	kW	61	91	131	189	219	311	385	525	656	583
Power	at 1500 rpm	P	kW	35	62	109	158	219	311	339⁶⁾	449⁶⁾	656	-
Torque	at V_{g max} and Δp = 350 bar²⁾	M_max	Nm	223	395	696	1002	1391	1976	2783	4174	4174	5565
Torque	and Δp = 100 bar²⁾	M	Nm	64	113	199	286	398	564	795	1193	1193	1590
Rotary stiffness of drive shaft	Shaft end P	c	kNm/rad	80	146	260	328	527	800	1145	1860	1860	2730
Rotary stiffness of drive shaft	Shaft end Z	c	kNm/rad	77	146	263	332	543	770	1136	1812	1812	2845
Moment of inertia		J_TW	Kgm²	0.0049	0.0121	0.03	0.055	0.0959	0.19	0.3325	0.66	0.66	1.20
Maximum angular acceleration⁴⁾		α	rad/s²	17000	11000	8000	6800	4800	3600	2800	2000	2000	1450
Case volume		V	L	2	2.5	5	4	10	8	14	19	22	27
Weight (without through drive) approx.		m	kg	39	53	88	102	184	207	320	460	490	605

High-speed rotary group version

Size		NG		71	250	355	500
Displacement, geometric, per revolution		V_{g max}	cm³	71	250	355	500
Rotational speed maximum¹⁾	at V_{g max}	n_nom	rpm	3000 ²⁾⁷⁾⁸⁾	1900²⁾	1700²⁾	1500²⁾
Rotational speed maximum¹⁾	at V_g ≤ V_g max	n_max	rpm	-	2100³⁾	1900³⁾	1800³⁾
Flow	at n_nom and V_{g max}	q_v	I/min	213 ⁷⁾⁸⁾	475	604	750
Power	at n_nom, V_{g max} and Δp = 350 bar	P	kW	124	277	352	437
Torque	at V_{g max} and Δp = 350 bar	M_max	Nm	395	1391²⁾	1976²⁾	2783²⁾
Rotary stiffness of drive shaft	Shaft end P	c	kNm/rad	146	527	800	1145
Rotary stiffness of drive shaft	Shaft end Z	c	kNm/rad	146	543	770	1136
Moment of inertia		J_TW	Kgm²	0.0121	0.0959	0.19	0.3325
Maximum angular acceleration⁴⁾		α	rad/s²	11000	4800	3600	2800
Case volume		V	L	2.5	10	8	14
Weight (without through drive) approx.		m	kg	53	184	207	320

1) The values are applicable:

-to the optimum viscosity range from V_opt = 36 to 16 mm²/s

- with hydraulic fluid based on mineral oils

2)The values apply at absolute pressure P_abs = 1 bar at suction ports.

3) Maximum rotational speed (speed limit) when increasing the inlet pressure P_abs at suction ports and V_g < V_g_max, see diagram on page 9.

4)The data are valid for values between the minimum required and maximum permissible rotational speed. Valid for external excitation(e.g. diesel engine 2 to 8 times rotary frequency; cardan shaft twice the rotary frequency). The limit value is only valid for a single pump. The load capacity of the connecting parts must be considered.

5) with charge pump (A4VSLO)

6) At V_g < V_gmax

7) If V_g > 30% (depending on speed dee diagram"High Speed NG71")

8) For suction pressure < 1 bar see diagram Maximum rotational speed (speed limit) no rotational speed increase possible when the inlet pressure increases.

Maximum permissible speed (speed limit)(Ps abs = Inlet pressure [bar)

Maximal permissible speed at High Speed size 71

Determining the characteristics

Flow	q_v=(V_g∙ n ∙ η_v) / 1000	I/min
Torque	M=(V_g ∙ Δp) / 20 ∙ π ∙ η_h_m	Nm
Power	P=(2π ∙ M ∙ n)/60000=(q_v∙ Δp)/600 ∙ η_t	kW

Key

V_g = Displacement per revolution in [cm^3]

Δp = Differential pressure [bar]

n = Rotational speed [rpm]

η_v= Volumetric efficiency

η_h_m = Hydraulic-mechanical efficiency

η_t = Total efficiency (η_t= η_v*η_hm)

Notices

▶Theoretica values, without efficiency and tolerances;values rounded

▶Operation above the maximum values or below the minimum values may result in a loss of function, a reduced service life or in the destruction of the axial piston unit. We recommend testing the loads by means of experiment or calculation / simulation and comparison with the permissible values.

▶Special requirements apply in the case of belt drives.Please contact us.

Permissible radial and axial forces of the drive shafts

Size

125

180

250

355

500

750¹⁾

1000

Radial force,

maximum

F_{q max}

1000

1200

1600

2000

2200

2500

3000

3500

Maximum axial force

±F_{ax max}

600

800

1000

1400

1800

2000

2200

Permissible input and through-drive torques

Size				40	71	125	180	250	355	500	750	1000
Torque at V_{g max} and Δp = 350 bar¹⁾		M_max	Nm	223	365	696	1002	1391	1976	2783	4174	5565
Maximum input torque on drive shaft²⁾
	Splined shaft Z	M_{E max}	Nm	446	790	1392	2004	2782	3952	5566	8348	11130
	Shaft key P	M_{E max}	Nm	380	700	1392	1400	2300	3557	5200	7513	9444
Maximum through-drive torque
	Splined shaft Z	M_D_max	Nm	223	395	696	1002	1391	1976	2783	4174	5565
	Shaft key P	M_D_max	Nm	157	305	696	398	909	1581	2417	3339	3879

Distribution of torques

Torque at 1st pump	M₁
Torque at 2nd pump	M₂
Torque at 3rd pump	M₃
Input torque	M_E=M₁₊M₂₊M₃
Input torque	M_E< M_{E max}
Through-drive torque	M_D=M₂₊M₃
Through-drive torque	M_D< M_{D max}

¹⁾Efficiency not considered

²⁾For drive shafts with no radial force

Variable Displacement Piston pump A4VSO

A4VSO