Technical Data - REXROTH AA2FM Reparaturanleitung

RA 91 001/08.97
Fixed Displacement Motor AA2FM (A2FM)

Technical Data

Hydraulic fluid
We request that before starting a project detailed information about
the choice of pressure fluids and application conditions are taken
from our catalogue sheets RA 90220 (petroleum oil), RA 90221
(environmentally acceptable hydraulic fluids) and RA 90223 (fire
resistance fluids, HF).
When using HF- or environmentally acceptable hydraulic fluids
possible limitations for the technical data have to be taken into
consideration. If necessary please consult us or your fluid supplier
(please indicate type of the hydraulic fluid used for your application on
the order sheet).
Operating viscosity range
In order to optain optimum efficiency and service life, we
recommend that the operating viscosity (at operating tem-
perature) be selected from within the range:
Optimum operating viscosity
referred to the loop temperature (closed circuit) or reservoir
temperature (open circuit).
Viscosity limits
The limiting values for viscosity are as follows:
Sizes 5...200
2
= 42 SUS (5 mm /s)
min
short term at a max. perm. temperature of t
= 7400 SUS (1600 mm
max
short term on cold start (t
Sizes 250...1000
= 60 SUS (10 mm 2 /s)
min
short term at a max. perm. leakage oil temp. of t
= 4600 SUS (1000 mm
max
short term on cold start (t
Please note that the max. fluid temperature is also not exceeded in
certain areas (for instance bearing area).
At temperatures of -13 F up to -40 F (-25 C up to -40 C) special
measures may be required for certain installation positions.
Please contact us for further information.
Selection diagram
(7000) 1600
(5000)
1000
(3000)
600
(2000)
400
(1000)
200
(500)
100
(300)
60
(200)
40
(150)
(100)
20
(80)
(70)
(60)
10
(50)
5
(40)
-40 -20 0 20
(-40) (-30) (-20) (-10) (0) (10) (20) (30) (40) (50) (60) (70) (80) (90)(100)
Temperature t in F ( C)
4
= 80...170 SUS (16...36 mm
opt
= 240 F (115 C)
max
2
/s)
= -40 F / C)
min
= 195 F (90 C)
max
2
/s)
= -13 F / -25 C)
min
40 60 80 100 120 140 160 180 200 220 240
(110)
Notes on the selection of the hydraulic fluid
In order to select the correct fluid, it is necessary to know the
operating temperature in the loop (closed circuit) or the reservoir
temperature (open circuit) in relation to the ambient temperature.
The hydraulic fluid should be selected so that within the operating
temperature range, the operating viscosity lies within the optimum
range ( ) (see shaded section of the selection diagram). We
opt
recommend that the highest possible viscosity range should be
chosen in each case.
Example: At an ambient temperature of X , the operating
temperature (closed circuit: loop temperature; open circuit: reservoir
temperature) is 140 F (60 C). Within the optimum operating
viscosity range (
grades VG 46 or VG 68. VG 68 should be selected.
Important: The leakage oil (case drain oil) temperature is influenced
by pressure and motor speed and is always higher than the circuit
temperature or the reservoir temperature.
However, at no point in the system may the temperature exceed
2
/s)
240 F (115 C) for sizes 5...200 or 195 F (90 C) for sizes
250...1000.
If it is not possible to comply with the above conditions because of
extreme operating parameters or high ambient temperature, please
consult us.
Filtration
The finer the filtration the better the achieved purity grade of the
pressure fluid and the longer the life of the axial piston unit.
To ensure the functioning of the axial piston unit a minimum purity
grade of:
9 to NAS 1638
6 to SAE
18/15 to ISO/DIS 4406 is necessary.
At very high temperatures of the hydraulic fluid (195 F to max.
240 F / 90 C to max. 115 C, not permissible for sizes
250...1000!) at least cleanless class
8 to NAS 1638
5 to SAE
17/14 to ISO/DIS 4406 is necessary.
If above mentioned grades cannot be maintained please consult us.
Direction of flow
clockwise rotation
A to B
1600 (7400) 1600 (7425)
Speed range
1000 (4600)
There is no limitation on minimum speed n
rotation is required, however, speed n
fall below 50 rpm.
See table on page 7 for max. permissible speeds.
Installation position
36
Any installation position possible. The motor housing must be filled
(170)
v
with fluid prior the commissioning, and must remain full whenever
opt.
16 it is operating.
(80)
For extensive information on installation postition, please consult our
10 (60)
data sheet RA 90270 before completing your design work.
Symbol
5 (42)
Connections
A, B Service line ports
(115)
T Drain port
; shaded area), this corresponds to viscosity
opt
counter-clockwise rotation
B to A
min
should not be allowed to
min
A
T B
. If uniformity of