Bosch Rexroth A4VG 35 Series - Dimensions; General Instructions

Installation 35/64
RE92035-01-B/2019-11-25, A4VG Series35, Bosch Rexroth AG
7.4.2 Dimensions
For standard versions, the datasheet 92035 contains all required installation
dimensions as well as the position and dimensions of the ports. If necessary, an
installation drawing can be requested. Also observe the manuals provided by the
manufacturers of the other hydraulic components when selecting the required tools.
7.4.3 General instructions
Follow these general notices when installing the axial piston unit:
• Note that certain installation positions will affect the control system. Gravity,
deadweight and case pressure can cause minor characteristic shifts and changes
in response time.
• Torsional vibrations and speed variations may cause leaks in the shaft seal and
increased rotary angular acceleration of the rotary group of the axial piston unit.
Atrisk are diesel drives with a small number of cylinders and low flywheel mass
and toothed belt or V-belt drives. Belts can lose much of their pre-charge pressure
after just a short operating time.
An automatic clamping device can lessen the speed variations and vibrations, and
thus avoid subsequential damage.
– When using drives with toothed belts or V-belts, always use an automatic
clamping device.
• On the drive of an axial piston unit, a cardan shaft may cause vibrations
and excessive rotary angular acceleration. Depending on the frequency and
temperature, this may cause leaks in the shaft seal and damage the rotary group.
• If a shared drain line is used for several units, make sure that the respective case
pressure in each unit is not exceeded. The shared drain line must be dimensioned
to ensure that the maximum permissible case pressure of all connected units is
not exceeded in any operating conditions, particularly at cold start. If this is not
possible, separate drain line must be laid, if necessary.
The version of installation for the axial piston unit depends on the connecting
elements to the drive side. The following descriptions explain the installation of the
axial piston unit:
• With a coupling
• On a gearbox
• On a cardan shaft