Bosch Rexroth 31 Series Instruction Manual page 37

Risk of confusion with
threaded connections
– For the pressure lines, use only pipes, hoses and connecting elements that are
rated for the working pressure range specified in data sheets 92701 and 92711
(see Table 11).
• Drain line
– Always route the drain lines so that the case is constantly filled with hydraulic
fluid and to ensure no air gets through the shaft seal, even during extended
standstill periods.
– The case pressure must never exceed the limits specified for the axial piston unit
in the data sheet.
– The drain line inflow in the reservoir should always be below the min. fluid level
(see chapter 7.3 "Installation position" on page 27).
• If the axial piston unit is equipped with installed screw fittings, do not remove
them. Screw the stud end of the fitting directly into the installed fitting.
Axial piston units are used in application areas that use the metric system as well as
the Anglo-American (imperial) and the Japanese measuring system (JIS – Japan
Industrial Standard). Various kinds of seals are also used.
The system of units, the kind of seal and the size of female thread and stud ends
(e.g. threaded plug) must all match.
There is a risk of confusion due to the limited ways of visually telling them apart.
wARnInG! Leaky or bursting stud ends!
For fittings, if a stud end that does not match the system of units, kind of seal and
size of the female thread is pressurized, the stud end may loosen itself or even be
ejected from the hole in a projectile-like manner. This can result in serious injury and
property damage. Hydraulic fluid can escape from this leakage point.
▶ Use the drawings (installation drawing) to determine the required stud end for
each fitting.
▶ Make sure the right fittings, mounting bolts and threaded plugs are installed.
▶ For all female threads, use a stud end from the same system of units and of the
correct size.
RE 92701-01-B/04.2018, A10VO, A10VSO Series 31, Bosch Rexroth AG
Installation 37/60