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Description
- Designed for application in commercial vehicles with standard-pressure requirements
- Size 125
- Nominal pressure 250 bar
- Maximum pressure 300 bar
- Open circuit
Features
- Flange and shaft designed for direct mounting on the power take-off of commercial vehicles
- Optimized weight by cast aluminum housing
- No drain line required
- Low operating noise
- Simple adjustment of rotatonal direction
- Excellent suction characteristics
- High total efficiency
- Long service life
- Bent-axis design
Type code
Type code
| 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | ||
| A17FN | O | / | 10 | N | L | W | K0 | E8 | 1 | – |
| Axial piston unit | |||
| 01 | Bent-axis design, fixed, for commercial vehicles (truck) | A17FN | |
| Operating mode | |||
| 02 | Pump, open circuit | O | |
| Nominal size | |||
| 03 | Geometric displacement, see tables of values | 125 | |
| Series | |||
| 04 | Series 1, index 0 | 10 | |
| Design of ports and fastening threads | |||
| 05 | Metric, port threads with profiled sealing ring according to DIN 3852 | N | |
| Direction of rotation1) | |||
| 06 | Viewed on drive shaft, counter-clockwise | L | |
| Seal material | |||
| 07 | FKM (fluor-caoutchouc) including the 2 shaft seal rings in FKM | W | |
| Mounting flange | |||
| 08 | Special flange ISO 7653-1985 (for trucks) | K0 | |
| Drive shaft | |||
| 09 | Splined shaft similar to DIN ISO 14 (for trucks) | E8 | |
| Working port | |||
| 10 | Threaded ports A and S at rear | 1 | |
| Standard/ special version | |||
| 11 | Standard version | 0 | |
| Special version | S | ||
| 1) | For changing the direction of rotation: see Technical data, chapter "Direction of rotation" |
Technical data
Table of values
| Size | 125 | |||
| Displacement | Vg | cm³ | 125 | |
| Nominal pressure | pnom | bar | 250 | |
| Maximum pressure | pmax | bar | 300 | |
| Maximum speed | nnom 1) | rpm | 1750 | |
| nmax 2) | rpm | 2500 | ||
| Flow | at nnom | qV | l/min | 219 |
| Power | at nnom and pnom | P | kW | 91 |
| Torque | at pnom | M | Nm | 497 |
| Rotary stiffness | c | kNm/rad | 11.9 | |
| Moment of inertia for rotary group | JTW | kg·m² | 0.0116 | |
| Maximum angular acceleration | ɑ | rad/s² | 4500 | |
| Case volume | V | l | 0.83 | |
| Mass moment | MG | Nm | 20 | |
| Weight (approx.) | m | kg | 15 | |
| 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. |
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 fluid
The axial piston unit is designed for operation with HLP mineral oil 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)
The axial piston unit is not suitable for operation with water-containing HF hydraulic fluids.
For operation with HFD hydraulic fluids please note limitations regarding technical data. Please contact us.
Viscosity and temperature of hydraulic fluids
|
| Viscosity | Temperature1) | Comment |
| Cold start | νmax ≤ 1600 mm²/s | ϑSt ≥ -25 °C | t ≤ 3 min, without load (p ≤ 50 bar), n ≤ 1000 rpm, |
| 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 |
| 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) | The FKM shaft seal may be used for case drain temperatures from -25 °C to +115 °C. For the temperature range below -25 °C, please contact us. |
| 3) | Equates e.g. with the VG 46 a temperature range of +5 °C to +85 °C (see selection diagram) |
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 | 250 | The nominal pressure corresponds to the maximum design pressure. |
| Maximum pressure | pmax | 300 bar | 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 | 5 s | ||
| Total operating period | 50 h | ||
| Minimum pressure | pHP min | 10 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 | 9000 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. |
| Maximum pressure | ps max | 2 bar absolute | |
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
Permissible axial forces of the drive shaft
| Size | 125 | |||
| Maximum axial force, when standstill or in non-pressurized conditions |  | + Fax max | N | 0 |
| - Fax max | N | 77 | ||
Notes
- The values given are maximum values and do not apply to continuous operation.
- The axial force in direction Faxmust be avoided as this would reduce the bearing life service.
- Radial forces are not permissible.
Direction of rotation
The direction of rotation of the axial piston unit is defined by means of a pressure nipple screwed into the service line port and can easily be changed.
By changing the pressure nipple, the service line port and the suction port are exchanged. This is e.g. required when mounting at a PTO with an counter-clockwise direction of rotation.
The process of converting the pressure nipple can be seen from the instruction manual (91520-01-B, chapter 6.4.2 “Direction of rotation and changing the direction of rotation”).
Direction of rotation on delivery
On delivery, the pressure nipple (1) is pre-assembled in the right service line port of the axial piston unit. The permissible drive direction of the pump looking at the drive shaft: counter-clockwise. The power take-off turns clockwise.
Note
- The pressure nipple is pre-assembled on delivery and must be tightened to the torque specified for the thread size before installation (see instruction manual).
Dimensions
| 1) | Center bore according to DIN 332 (thread according to DIN 13) |
Ports
| Size | 125 | ||
| A | Working port | Size | G 1; 18 mm deep |
| Standard | DIN ISO 228 | ||
| State on delivery | With protective cover (must be connected) | ||
| S | Suction port | Size | G 1 1/4; 20 mm deep |
| Standard | DIN ISO 228 | ||
| State on delivery | With protective cover (must be connected) | ||
| R | Air bleed port | Size | M10 x 1; 8 mm deep |
| Standard 1) | DIN 3852 | ||
| State on delivery 2) | Plugged | ||
| 1) | The spot face can be deeper than specified in the appropriate standard. |
| 2) | Unless otherwise specified. Other layouts on request. |
Project planning information
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.
- The pump housing is internally connected to the suction chamber. A separate drain line from the housing to the reservoir is not needed.
- 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.
Installation position
See the following examples 1 to 4.
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 | R | S |
| 2 | ‒ | S |
Above-reservoir installation
Above-reservoir installation means that the axial piston unit is installed above the minimum fluid level of the reservoir.
| Installation position | Air bleeding | Filling |
| 3 | R | F |
| 4 | S | S |
| Key | |
| F | Filling / Air bleeding |
| R | Air bleed port |
| S | Suction port |
| ht min | Minimum required immersion depth (200 mm) |
| hmin | Minimum required spacing to reservoir bottom (100 mm) |
| 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.
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 only intended to accommodate hydraulic lines.
Information
Other related documents
Other pumps with special characteristics and dimensions for use in commercial vehicles can be found in the following data sheets:
- 91520: Fixed pump A17FO (300/350 bar)
- 92270:Variable pump A18VO (350/400 bar)
- 92280:Variable pump A18VLO (350/400 bar)
Accessories
Suction adapter
| Pump size | Version | Hose | Material number | Thread K0 | K1 | K2 | K3 | K4 | K5 | K6 | K7 | K8 | K9 | SW |
| mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | |||||
| 125 | straight | 2 | R902600252 | G1 1/4 | 51 | 30 | 44 | 85 | 65 | - | 306 | 177 | 245 | 55 |
| 2 1/2 | R902601630 | G1 1/4 | 63 | 31 | 54 | 82 | 64 | - | 308 | 180 | 248 | 65 | ||
| 45° | 2 | R909831597 | G1 1/4 | 51 | 34 | 43 | 101 | 81 | 40 | 328 | 165 | 234 | 50 | |
| 2 1/2 | R902601631 | G1 1/4 | 63 | 35 | 54 | 100 | 81 | 44 | 331 | 169 | 237 | 50 | ||
| 90° | 2 | R909831598 | G1 1/4 | 51 | 35 | 43 | 63 | 43 | 80 | 341 | 153 | 221 | 50 |
The suction adapter is not included in the scope of delivery and must be ordered separately.
Notes on suction line
- Keep as short and straight as possible, without bend
- Use a supporting ring for plastic hoses
- Use two hose clamps to protect the suction hose against air suction
- Note pressure resistance of suction hose compared to ambient pressure
Replacing seals
The O-rings used as seals to prevent air from entering the suction line are to be replaced after every removal and new installation in order to guarantee complete sealing.
Material number for O-rings
- R909083796: O-ring for suction stud G3/4
- R909083802: O-ring for suction stud G1
- R909083808: O-ring for suction stud G1¼
Coupling flange
There are special, modified coupling flanges in 4-hole and 6-hole design for the cardan shaft drive.
The coupling flange is not included in the scope of delivery and must be ordered separately.
4-hole coupling flange, complete – ⌀90 mm
Material number: R902060152
6-hole coupling flange, complete – ⌀100 mm
Material number: R902060153
Notes
- Assembly of the coupling flange is carried out by pulling onto the drive shaft with the aid of the threaded bore in the drive shaft end.
- The coupling flange must be clamped on the drive shaft using a socket-head screw. In addition, permanent lubrication should be applied between the drive shaft and the coupling flange.
- The socket-head screw should be secured in a suitable manner (e.g. gluing with Loctite 276) and tightened with a tightening torque of 130 Nm.
- Sudden axial impact upon the drive shaft will lead to rotary group damage and therefore must be strictly avoided.
Safety Instructions
- 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).
Downloads
 | Axialkolben-Konstantpumpe A17FNO Data Sheet | RD91510 | 2015-11-01 | German | PDF | 302k Product Groups: Pumps, Fixed pumps Baureihe 10 |
| Axial Piston Fixed Pump A17FNO Data Sheet | RE91510 | 2015-02-01 | English | PDF | 300k Product Groups: Pumps, Fixed pumps Series 10 |
| Axial Piston Fixed Pump A17FO/A17FNO Manual | RE91520-01-B | 2011-02-01 | English | PDF | 1.8MB Product Groups: Pumps, Fixed pumps |
| Axialkolben-Konstantpumpe A17FO/A17FNO Manual | RD91520-01-B | 2011-02-01 | German | PDF | 1.8MB Product Groups: Pumps, Fixed pumps |
| A17F(N)O series 10 Fact Sheet | RE98747 | 2020-02-21 | English | PDF | 568k Product Groups: A17FNO A17F(N)O series 10 Axial piston fixed pump |
| A17F(N)O Baureihe10 Fact Sheet | RD98747 | 2020-02-21 | German | PDF | 574k Product Groups: A17FNO A17F(N)O Baureihe10 Axialkolben-Konstantpumpe |
| А17F(N)O серии 10Высокое Fact Sheet | R-RS98747 | 2020-02-21 | Russian | PDF | 1.9MB Product Groups: A17FNO Аксиально-поршневой нерегулируемый насос |
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