50/104 Installation
Bosch Rexroth AG, A4... with HS5E pilot control valve/Series 3x, RE 92076-01-B/10.2017
• Drain line
– Always route the drain lines so that the housing is constantly filled with hydraulic
fluid and to ensure that no air gets through the shaft seal even during extended
standstill periods.
– Under no operating circumstances may the case pressure exceed the maximum
limit values specified for the axial piston unit in the data sheet.
– The drain line inflow in the reservoir must always be below the minimum fluid
level (see chapter7.3 “Installation position” on page42).
• If the axial piston unit is equipped with installed screw fittings, these must not be
unscrewed. Screw the stud end of the fitting directly into the installed fitting.
Axial piston units are employed in application areas that use the metric measuring
system as well as the Anglo-American (imperial) and the Japanese measuring system
(JIS – Japan Industrial Standard). Moreover, various kinds of seal are 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 which is of a different measurement system, kind of seal
and size with respect to 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.
Risk of confusion with
threaded connections
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