Bosch 70 Series Instruction Manual page 32

32/52 Installation
Risk of confusion with
threaded connections
Bosch Rexroth AG, A2FM/A2FE Series 70, RE 91071-01-B/03.2015
• Drain line:
– Always route the drain lines so that the case 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
values specified for the axial piston unit in the data sheet.
– The drain line joint in the reservoir must 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, these must not
be unscrewed. Screw the stud end of the fitting directly into the installed screw
fitting.
Axial piston units are employed in regions using the metric measuring system, in
regions using the Anglo-American (imperial) measuring system and in regions using
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.
The limited ways of telling them apart visually poses a risk of confusing them.
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.