AXIAL PISTON FIXED PUMP

AA2FO seriesĀ 6x

Material #: R902423850

Model : AAA2FO250/60R-VKD55

Price: $11,847.73

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 size 250 Bent-axis design

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$11,847.73

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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 size 250 Bent-axis design

Table of values

Size

10 12 16 23 28 32 45 56 63 80 90 107 125 160 180 250

Displacement
geometric, per revolution

Vg

cm³

10.3 12 16 22.9 28.1 32 45.6 56.1 63 80.4 90 106.7 125 160.4 180 250

Nominal pressure

pnom

bar

400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 350

Maximum pressure

pmax

bar

450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 400

Maximum speed

nnom 1)

rpm

3150 3150 3150 2500 2500 2500 2240 2000 2000 1800 1800 1600 1600 1450 1450 1500

nmax 2)

rpm

6000 6000 6000 4750 4750 4750 4250 3750 3750 3350 3350 3000 3000 2650 2650 1800

Flow

at nnom

qV

l/min

32 38 50 57 70 80 102 112 126 145 162 171 200 233 261 375

Power

at nnom and pnom

P

kW

22 25 34 38 47 53 68 75 84 96 108 114 133 155 174 219

Torque 3)

at pnom

M

Nm

66 76 102 146 179 204 290 357 401 512 573 679 796 1021 1146 1393

Rotary stiffness

c

kNm/rad

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 73.1

Moment of inertia for rotary group

JTW

kg·m²

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 0.061

Maximum angular acceleration

ɑ

rad/s²

5000 5000 5000 6500 6500 6500 14600 7500 7500 6000 6000 4500 4500 3500 3500 10000

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 2.5

Weight (approx.)

m

kg

6 6 6 9.5 9.5 9.5 13.5 18 18 23 23 32 32 45 45 73
1) These values are valid at:
- an absolute pressure of pabs = 1 bar at suction port S
- for the optimum viscosity range from vopt = 36 to 16 mm2/s
- with hydraulic fluid based on 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

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.

Determining the operating characteristics

Flow

[l/min]

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

Temperature1)

Comment

Cold start

νmax ≤ 1600 mm²/s

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

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)

ϑ ≤ +103 °C

measured at bleed port R
(ΔT = ca. 12 K between the bearing/shaft seal and port R)

νopt = 16 … 36 mm²/s

range of optimum operating viscosity and efficiency

Short-term operation

νmin = 7 … 10 mm²/s

ϑ ≤ +103 °C

t ≤ 3 min, p ≤ 0.3 • pnom

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)

Explanatory note regarding the selection of hydraulic fluid

The hydraulic fluid should be selected such that the operating viscosity in the operating temperature range is within the optimum range (vopt 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.

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.

Pressure at suction port S (inlet)

Definition

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

Case pressure at port T

Definition

Continuous differential pressure

ΔpT cont

2 bar

Maximum averaged differential pressure at the shaft seal (case to ambient)

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

Note

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

Pressure definition

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

Rate of pressure change

Maximum differential pressure at the shaft seal

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

Direction of flow

S to B

S to A

Permissible radial and axial forces of the drive shaft

Size

10 12 16 23 28 32 45 56 63 80 90 107 125 160 180 250

Drive shaft

Code

S P B S P B S B S P B S P B S B S P S T P B S T B Q U P B Q U B U S P B U S B S P B S B S, P

Maximum radial force
at distance a
(from shaft collar)

Fq max

kN

2.8 3 3.2 3.3 3 3.2 4.3 3.2 3.6 5.7 5.4 4.4 5.7 5.4 5.1 5.4 7.3 7.6 7.6 9.2 9.5 9.1 7.6 10.3 9.1 7.6 11.6 11.6 11.4 7.6 11.6 11.4 12.4 12.2 13.6 14.1 12.4 14.3 14.1 14.9 18.1 18.3 14.9 18.3 1.2

a

mm

16.8 16 16 16.8 16 16 16.8 16 24 16 16 24 16 16 24 16 24 18 24 24 18 18 24 24 18 24 24 20 20 24 24 20 27 33.5 20 20 27 33.5 20 33.5 25 25 33.5 25 41

Permitted torque at Fq max

Tq max

Nm

66 66 66 76 76 76 98 102 146 146 146 179 179 179 204 204 290 290 302 357 357 357 302 401 401 302 450 512 512 302 450 573 594 679 679 679 594 796 796 828 1021 1021 828 1146

Permitted differential pressure at Fq max

Δpq max

bar

400 400 400 400 400 400 385 400 400 400 400 400 400 400 400 400 400 400 339 400 400 400 301 400 400 237 352 400 400 211 314 400 349 400 400 400 298 400 400 325 400 400 289 400

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 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

- Fax max

N

320 320 320 320 320 320 320 320 500 500 500 500 500 500 500 500 630 630 800 800 800 800 800 800 800 1000 1000 1000 1000 1000 1000 1000 1250 1250 1250 1250 1250 1250 1250 1600 1600 1600 1600 1600 2000

Maximum axial force, per bar operating pressure

+ Fax max

N/bar

3 3 3 3 3 3 3 3 5.2 5.2 5.2 5.2 5.2 5.2 5.2 5.2 7 7 8.7 8.7 8.7 8.7 8.7 8.7 8.7 10.6 10.6 10.6 10.6 10.6 10.6 10.6 12.9 12.9 12.9 12.9 12.9 12.9 12.9 16.7 16.7 16.7 16.7 16.7

General information

The specified values are maximum data and not approved for continuous operation. The axial force in the direction of action -Fax is to be avoided as this reduces the bearing life cycle. The output by means of belts requires special conditions. Please consult us.

Notes for size 250:

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 10 … 180

Toothed gear drive, size 250

1

Direction of rotation "clockwise", pressure at port B

2

Direction of rotation "counter-clockwise", pressure at port A

Long-Life bearing

Size 250

For long service life and use with HF hydraulic fluids. Identical external dimensions as version with standard bearings. Subsequent conversion to long-life bearings is possible. Bearing and case flushing via port U is recommended.

Bearing flushing

Flushing flow (recommended)

Size

250

Flushing flow qv

l/min

10

Size 10 … 16

Drive shafts S, P and B

1) Toothing data valid for basic number of teeth 48
2) Thread according to ASME B1.1
3) Center bore according to DIN 332 (thread according to DIN 13)

Ports

Size

10 12 16

B (A)

Working port

Size

1 1/16 in 12UN-2B; 20 mm deep

Standard 1)

ISO 11926

State on delivery

With protective cover (must be connected)

S

Suction port

Size

1 5/16 in 12UN-2B; 20 mm deep

Standard 1)

ISO 11926

State on delivery

With protective cover (must be connected)

T1

Drain port

Size

9/16 in 18UNF-2B; 13 mm deep

Standard 1)

ISO 11926

State on delivery 2)

With protective cover (must be connected)

T2

Drain port

Size

9/16 in 18UNF-2B; 13 mm deep

Standard 1)

ISO 11926

State on delivery 2)

Plugged (observe installation instructions)

R

Air bleed port

Size

5/16 in 24UNF-2B; 10 mm deep

Standard 1)

ISO 11926

State on delivery

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

Size 23 … 180

Size

D1

D3

D4

D6

D8

D11

D12

D13

D14

D15

D16

D17

D18

D20

D22

D25

D28

D29

D32

D40

D41

D42

D43

D44

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

23 127 0
- 0.05
210 120 60 20 12.7 70 161 91 186 14 27 125 59 31 146 162 14.3 106 18.2 40.5 13 22.2 47.6
28 127 0
- 0.05
210 120 60 20 12.7 70 161 91 186 14 27 125 59 31 146 162 14.3 106 18.2 40.5 13 22.2 47.6
32 127 0
- 0.05
210 120 60 20 12.7 70 161 91 186 14 27 125 59 31 146 162 14.3 106 18.2 40.5 13 22.2 47.6
45 127 0
- 0.05
230 132 64 20 12.7 80 179 102 205 20 30 133 66 34 146 162 14.3 118 23.8 50.8 19 26.2 52.4
56 127 0
- 0.05
248 141 68 20 12.7 87 195 109 221 23 33 143 74 36 146 162 14.3 128 23.8 50.8 19 26.2 52.4
63 127 0
- 0.05
248 141 68 20 12.7 87 195 109 221 23 33 143 74 36 146 162 14.3 128 23.8 50.8 19 26.2 52.4
80 127 0
- 0.05
282 158 73 20 12.7 99 225 122 253 25 41 161 93 40 146 162 14.3 183 27.8 57.2 25 30.2 58.7
90 127 0
- 0.05
282 158 73 20 12.7 99 225 122 253 25 41 161 93 40 146 162 14.3 183 27.8 57.2 25 30.2 58.7
107 152.4 0
- 0.05
306 173 89 25 12.7 110 246 136 277 20 43 175 96.9 44 200 228.6 20.6 150 31.8 66.7 32 35.7 69.9
125 152.4 0
- 0.05
306 173 89 25 12.7 110 246 136 277 20 43 175 96.9 44 200 228.6 20.6 150 31.8 66.7 32 35.7 69.9
160 152.4 0
- 0.05
326 189 101 25 12.7 121 269 149 303 15 47 190 104 45 200 229 21 180 31.8 66.7 32 35.7 69.9
180 152.4 0
- 0.05
326 189 101 25 12.7 121 269 149 303 15 47 190 104 45 200 229 21 180 31.8 66.7 32 35.7 69.9

Drive shafts S and U

1) Thread according to ASME B1.1

Splined shaft SAE J744

NG

Code

Designation 1)

Thread G

N2

N3

N4

N5

ØN6

N9

⌀N10

mm

mm

mm

mm

mm

mm

mm

23 S 1 1/4 in 14T 12/24 DP 7/16-14UNC-2B 9.5 28 40 48 35 55.9 80
28 S 1 1/4 in 14T 12/24 DP 7/16-14UNC-2B 9.5 28 40 48 35 55.9 80
32 S 1 1/4 in 14T 12/24 DP 7/16-14UNC-2B 9.5 28 40 35 35 55.9 80
45 S 1 1/4 in 14T 12/24 DP 7/16-14UNC-2B 9.5 28 40 48 35 55.9 95
56 S 1 1/4 in 14T 12/24 DP 7/16-14UNC-2B 9.5 28 40 48 40 55.9 105
T 1 3/8 in 21T 16/32 DP 7/16-14UNC-2B 9.5 28 40 48 40 55.9 105
63 S 1 1/4 14T 12/24 DP 7/16-14UNC-2B 9.5 28 40 48 40 55.9 105
T 1 3/8 in 21T 16/32 DP 7/16-14UNC-2B 9.5 28 40 48 40 55.9 105
80 Q 1 1/4 in 14T 12/24 DP 7/16-14UNC-2B 9.5 28 40 48 45 56 115
U 1 3/8 in 21T 16/32 DP 7/16-14UNC-2B 9.5 28 40 48 45 56 115
90 Q 1 1/4 in 14T 12/24 DP 7/16-14UNC-2B 9.5 28 40 48 45 56 115
U 1 3/8 in 21T 16/32 DP 7/16-14UNC-2B 9.5 28 40 48 45 56 115
107 U 1 1/2 in 23T 16/32 DP 5/8-11UNC-2B 12 36 56 62 50 69.9 125
S 1 3/4 in 13T 8/16 DP 5/8-11UNC-2B 12 36 55 67 50 74.9 125
125 U 1 1/2 in 23T 16/32 DP 5/8-11UNC-2B 12 36 56 62 50 69.9 125
S 1 3/4 in 13T 8/16 DP 5/8-11UNC-2B 12 36 55 67 50 74.9 125
160 S 1 3/4 in 13T 8/16 DP 5/8-11UNC-2B 12 36 55 67 60 74.9 140
180 S 1 3/4 in 13T 8/16 DP 5/8-11UNC-2B 12 36 55 67 60 74.9 140
1) Toothing data valid for basic number of teeth 48

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

N9

⌀N10

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

23 P ⌀25, AS8x7x40 M8 × 1.25 25 + 0.015
+ 0.002
6 19 50 35 28 8 57.9 80
B ⌀30, AS8x7x50 M10 × 1.5 30 + 0.015
+ 0.002
7.5 22 50 35 33 8 57.9 80
28 P ⌀25, AS8x7x40 M8 × 1.25 25 + 0.015
+ 0.002
6 19 50 35 28 8 57.9 80
B ⌀30, AS8x7x50 M10 × 1.5 30 + 0.015
+ 0.002
7.5 22 50 35 33 8 57.9 80
32 B ⌀30, AS8x7x50 M10 × 1.5 30 + 0.015
+ 0.002
7.5 22 50 35 33 8 57.9 80
45 P ⌀30, AS8x7x50 M12 × 1.75 30 + 0.015
+ 0.002
9.5 28 60 35 33 8 67.9 95
56 P ⌀30, AS8x7x50 M12 × 1.75 30 + 0.015
+ 0.002
9.5 28 60 40 33 8 67.9 105
B ⌀35, AS10x8x50 M12 × 1.75 35 + 0.018
+ 0.002
9.5 28 60 40 38 10 67.9 105
63 B ⌀35, AS10x8x50 M12 × 1.75 35 + 0.018
+ 0.002
9.5 28 60 40 38 10 67.9 105
80 P ⌀35, AS10x8x56 M12 × 1.75 35 + 0.018
+ 0.002
9.5 28 70 45 38 10 78 115
B ⌀40, AS12x8x56 M16 × 2 40 + 0.018
+ 0.002
12 36 70 45 43 12 78 115
90 B ⌀40, AS12x8x56 M16 × 2 40 + 0.018
+ 0.002
12 36 70 45 43 12 78 115
107 P ⌀40, AS12x8x63 M12 × 1.75 40 + 0.018
+ 0.002
9.5 28 80 50 43 12 87.9 125
B ⌀45, AS14x9x63 M16 × 2 45 + 0.018
+ 0.002
12 36 80 50 48.5 14 87.9 125
125 B ⌀45, AS14x9x63 M16 × 2 45 + 0.018
+ 0.002
12 36 80 50 48.5 14 87.9 125
160 P ⌀45, AS14x9x70 M16 × 2 45 + 0.018
+ 0.002
12 36 90 60 48.5 14 97.9 140
B ⌀50, AS14x9x70 M16 × 2 50 + 0.018
+ 0.002
12 36 90 60 53.5 14 97.9 140
180 B ⌀50, AS14x9x70 M16 × 2 50 + 0.018
+ 0.002
12 36 90 60 53.5 14 97.9 140

Ports

Size

23 28 32 45 56 63 80 90 107 125 160 180

B (A)

Working port

Size

1/2 in 3/4 in 1 in 1 1/4 in

Standard 1)

Dimensions according to SAE J518

Fastening thread

5/16 in 18UNC-2B; 18 mm deep 3/8 in 16UNC-2B; 21 mm deep 3/8 in 16UNC-2B; 18 mm deep 7/16 in 14UNC-2B; 22 mm deep 1/2 in 13UNC-2B; 19 mm deep

State on delivery

With protective cover (must be connected)

S

Suction port

Size

3/4 in 1 in 1 1/4 in 1 1/2 in

Standard

Dimensions according to SAE J518 1)

Fastening thread

3/8 in 16UNC-2B; 20 mm deep 7/16 in 14UNC-2B; 26 mm deep 7/16 in 14UNC-2B; 24 mm deep 1/2 in 13UNC-2B; 24 mm deep

State on delivery

With protective cover (must be connected)

T1

Drain port

Size

3/4 in 16UNF-2B; 15 mm deep 7/8 in 14UNF-2B; 17 mm deep

Standard 1)

ISO 11926

State on delivery 2)

With protective cover (observe installation instructions)

T2

Drain port

Size

3/4 in 16UNF-2B; 15 mm deep 7/8 in 14UNF-2B; 17 mm deep

Standard 1)

ISO 11926

State on delivery 2)

Plugged (observe installation instructions)

R

Air bleed port

Size

5/6 in 24UNF-2B; 10 mm deep 7/16 in 24UNF-2B; 12 mm deep 7/16 in 20UNF-2B; 12 mm deep 9/16 in 20UNF-2B; 13 mm deep

Standard 1)

ISO 11926

State on delivery

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

Size 250

Drive shafts S and K

1) Toothing data valid for basic number of teeth 48
2) Thread according to ASME B1.1

Ports

Size

250

B (A)

Working port

Size

1 1/4 in

Standard 1)

Dimensions according to SAE J518

Fastening thread

1/2 in 13UNC-2B; 20 mm deep

State on delivery

With protective cover (must be connected)

S

Suction port

Size

2 1/2 in

Standard

Dimensions according to SAE J518 1)

Fastening thread

1/2 in 13UNC-2B; 20 mm deep

State on delivery

With protective cover (must be connected)

T1

Drain port

Size

7/8 in 14UNF-2B; 17 mm deep

Standard 1)

ISO 11926

State on delivery 2)

With protective cover (observe installation instructions)

T2

Drain port

Size

7/8 in 14UNF-2B; 17 mm deep

Standard 1)

ISO 11926

State on delivery 2)

Plugged (observe installation instructions)

U

Bearing flushing

Size

9/16 in 20UNF-2B; 13 mm deep

Standard 1)

DIN 3852

State on delivery

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

Installation instructions

General

During commissioning and operation, the axial piston unit must be filled with hydraulic fluid and air bled. This must also be observed following a relatively long standstill as the axial piston unit may drain back to the reservoir via the hydraulic lines. Particularly in the installation position "drive shaft upwards" filling and air bleeding must be carried out completely as there is, for example, a danger of dry running. The case drain fluid in the housing must be directed to the reservoir via the highest available drain port (T1,T2). If a shared drain line is used for several units, make sure that the respective case pressure is not exceeded. The shared drain line must be dimensioned to ensure that the maximum permissible case pressure of all connected units is not exceeded in any operating conditions, specifically on cold start. If this is not possible, separate reservoir lines must be laid as required. To achieve favorable noise values, all connecting lines should be decoupled by using elastic elements and above-reservoir installation is to be avoided. In all operating conditions, the suction and drain lines must lead into the reservoir below the minimum fluid level. The permissible suction height hS results from the overall loss of pressure; it must not, however, be higher than hS max = 800 mm. The minimum suction pressure at port S must also not fall below 0,8 bar absolute during operation and during cold start. When designing the reservoir, ensure adequate space between the suction line and the drain line.This provides a slow-down and desgasification of the fluid and prevents that heated return flow is being drawn directly back into the suction line.

Installation position

See the following examples 1 to 8.

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

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

S

Suction port

T1, T2

Drain port

ht min

Minimum required immersion depth (200 mm)

hmin

Minimum required spacing to reservoir bottom (100 mm)

SB

Baffle (baffle plate)

hS max

Maximum permissible suction height (800 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 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. 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).