Bosch rexroth A21VG 10 Series, Instruction Manual

Page: 37 / 56

Installation 37/56
RE 93223-01-B/09.2020, A21VG Series 10, Bosch Rexroth Corporation
The following tightening torques apply:
• Female threads hole of the axial piston unit:
The maximum permissible tightening torques M
G max
are maximum values of the
for the female threads and must not be exceeded. Values, see Table 11.
• Fittings:
Observe the manufacturer’s instruction regarding tightening torques for the used
fittings.
• Mounting bolts:
For mounting bolts with metric ISO thread according to DIN 13 or with thread
according to ASME B1.1, we recommend checking the tightening torque in
individual cases as per VDI 2230.
• Threaded plugs:
For the metallic threaded plugs supplied with the axial piston unit, the required
tightening torques of threaded plugs M
V
apply. Values, see Table 11.
Table 11: Tightening torques of the female threads and threaded plugs
Ports
Maximum permissible
tightening torque of the
female threads M
G max
Required tightening torque of
the threaded plugs M
V
WAF
hexagon socket of the
threaded plugs
Standard Thread size
ISO 11926 5/16-24 UNF-2B 10 Nm 7 Nm 1/8 in
3/8-24 UNF-2B 20 Nm 10 Nm 5/32 in
7/16-20 UNF-2B 40 Nm 18 Nm 3/16 in
9/16-18 UNF-2B 80 Nm 35 Nm 1/4 in
3/4-16 UNF-2B 160 Nm 70 Nm 5/16 in
7/8-14 UNF-2B 240 Nm 110 Nm 3/8 in
1 1/16-12 UN-2B 360 Nm 170 Nm 9/16 in
1 5/16-12 UN-2B 540 Nm 270 Nm 5/8 in
1 5/8-12 UN-2B 960 Nm 320 Nm 3/4 in
1 7/8-12 UN-2B 1200 Nm 390 Nm 3/4 in
To connect the axial piston unit to the hydraulic system:
1. Remove the protection plugs and threaded plugs at the ports at which the
connections are to be made according to the hydraulic schematic.
2. Make sure that the sealing surfaces of the hydraulic ports and functional
surfaces are not damaged.
3.
Use only clean hydraulic lines or flush them before installation. (Note
chapter 7.5 “Performing flushing cycle” on page 38 when you flush out the
complete system.)
4. Connect the lines in accordance with the installation drawing and the machine
or system schematic. Check whether all ports are connected or plugged with
threaded plugs.
5. Tighten the fittings correctly (note tightening torques). Mark all correctly
tightened fittings, e.g. with a permanent marker.
6. Check all pipes and hose lines and every combination of connecting pieces,
couplings or connecting points with hoses or pipes to ensure they are in
condition for safe working.
For relationship between direction of rotation and flow direction, please refer to
data sheet 93223.
Tightening torques
Procedure