Bosch rexroth 1 Series - Hydraulically Connecting the Axial Piston Unit

Installation 41/68
RE 93100-01-B/2019-09-10, A20V(L)O Series 1, Bosch Rexroth AG
7.4.8 Hydraulically connecting theaxial piston unit
NOTICE
Insufficient suction pressure!
Generally, aminimum permissible suction pressure atportS isspecified for axial
piston pumps inall installation positions. Ifthepressure atportS drops below
thespecified values, damage may occur which may lead tothe destruction ofthe
axial piston pump!
▶ Make sure therequired suction pressure ismaintained. This isinfluenced by:
– The piping (e.g. suction cross-section, pipe diameter, length ofsuction line)
– The position ofthereservoir
– The viscosity ofthehydraulic fluid
– A filter element orcheck valve inthe suction line (check thelevel
ofcontamination ofthefilter element regularly)
– the geodesic height of the place of use
The machine/system manufacturer isresponsible for dimensioning ofthelines.
Connect theaxial piston unit tothe rest ofthehydraulic system inaccordance with
thehydraulic circuit diagram ofthemachine/system manufacturer.
The ports and fastening threads are designed for the maximum permissible
pressures p
max
, see in Table 16, Table 17 and Table 18 on page44. The machine/
system manufacturer isrequired toensure that theconnecting elements and lines
correspond tothe specified application conditions (pressure, flow, hydraulic fluid,
temperature) with thenecessary safety factors.
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installed 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 sheets 93100 (seeTable 16,
Table 17 and Table 18).
• 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.
Information onrouting
oflines