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A15VO/A15VLO series 12 | Installation
Information on
routing of lines
Risk of confusion with
threaded connections
Bosch Rexroth AG, RE 92512-01-B/2023-03-27
Connect only hydraulic lines that are match the axial piston unit port
(pressure level, size, system of units).
Observe the following information when routing the suction, pressure and
drain lines.
• Lines and hoses should be assembled without pre-charge pressure so no further
mechanical forces are applied during operation that will reduce the service life of
the axial piston unit and, possibly, the entire machine/system.
• Use suitable seals as sealing material.
• Suction line (pipe or hose)
– The suction line should be as short and straight as possible.
– Measure the line cross section of the suction line so the pressure at the suction
port does not drop below the minimum permissible pressure. Make sure the
maximum suction pressure is not exceeded (e.g. when prefilling).
– Make sure the connections and connecting elements are airtight.
– The hose must be pressure-resistant, also to external air pressure.
• Pressure line
– For the pressure lines, use only pipes, hoses and connecting elements rated for
the working pressure range specified in data sheet 92512 (see Table 9).
• 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 28).
• If the axial piston unit is equipped with assembled 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.
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