40/68 Installation
Bosch Rexroth AG
, A4VG Series 40, RE 92004-01-B/05.2017
Observe the following notices when routing the suction, pressure, and drain lines.
• Lines and hoses must be installed without pre-charge pressure, so that no further
mechanical forces are applied during operation that will reduce the service life of
the axial piston unit and, if applicable, 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 that the pressure at the
suction port does not drop below the minimum permissible pressure. Make
sure that the maximum suction pressure is not exceeded (e.g. when pre-filling).
– Make sure the connections and connecting elements are airtight.
– The hose must be pressure-resistant, also regarding 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 92004 (see Table 10).
• 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 chapter 7.3 “Installation position” on page 31).
• 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 –
J
apan
I
ndustrial
S
tandard). 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.
notices on routing lines
Risk of confusion with
threaded connections
