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Risk of confusion with
threaded connections
• Drain line
– Always route the drain lines so that the housing 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 limit values specified for the
axial piston unit in the data sheet.
– The drain line inflow in the reservoir should always be below the minimum fluid
level (see chapter 7.3 "Installation position" on page 26).
• 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 and 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.
Installation | A2FO series 70
RE 91405-01-B/2021-05-21, Bosch Rexroth AG
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