- Installation instructions for supplementary outriggers -
Via Mediterraneo, 6 - 42022 - Boretto - Reggio Emilia - Italy
Tel. +39 - 0522-96 30 08 - Fax +39 - 0522-96 30 39
- 18 -
12 - HYDRAULIC CONNECTION OF “MAXISTAB” SUPPLEMENTARY
OUTRIGGERS
The
MAXISTAB
stabilizers are supplied equipped with their own installed hydraulic circuit.
Piping is interrupted and open in the middle of the stabilizer itself, in order to allow the connection to the hydraulic
feeding circuit, according to different schemes which are left to the installer’s preference. Even within such power of
discretion, for safety reasons and regulations, it is essential that the control hydraulic circuit can be operated on
both sides of the vehicle, so that the operations concerning stabilizer rods extension and stabilizer cylinders lowering
on the ground are always visible during their execution.
In the following pages (Pict. 22-23-24-25-26) are shown as an example the schemes of some hydraulic circuits for
the connection to
MAXISTAB
stabilizers.
ATTENTION
Whatever the type of circuit chosen is, you have to make sure of connecting always the bottom side of one stabilizer
cylinder with the bottom side of the other one, and consequently also the rod side of the first one with the rod side
of the other one (compare the pict. 22-23-24-25-26).
Otherwise, when putting into service for the first time, the overpressure caused by the wrong connection will result in
the immediate breaking of one of the cylinder heads, without any warranty acknowledgement by
Next Hydraulics
.
In Section13, is shown the connection scheme for the supply of the rod extensions cylinders for
MAXISTAB
models
1 EHO
and
2 EHO
.
We hereby recall some information and warnings.
12.1 Lock valves on outrigger cylinders
All stabilizers starting from series
2
inclusive onwards are fitted with standard double acting lock valves, while all
stabilizers of series
ML
,
0
and
1
are fitted with simple acting manual lock valves.
NOTE
: in case the crane valve bank is a so called “open centre” type, the stabilizers lock valves need to be double
acting. In case of order of stabilizers series
ML
,
0
or
1
, this is to be specified when placing it.
12.2 Connection piping
The connection piping to the hydraulic circuit of
MAXISTAB
stabilizers can be either a steel stiff type or rubber
hoses with steel plaits, but always of a type suitable for high pressure hydraulics. The internal diameters, materials
and thicknesses must be suitable to circuit pressures and circulating oil flow. About this we suggest to follow the
EN
12999
prescriptions.
12.3 Prescriptions for Maxistab hydraulic system
Locking pins and safety automatic latches against accidental coming out of the lateral extension
beams must be protected from damage by limiting the pressure on bottom side of the extension
cylinders (ref. picts. 12.6, 12.7).
It is also required that spools of the
“closed center” type
are fitted on the sections of the distributor
valvebank that controls lateral extensions (ref. again picts 12.6, 12.7).
Follow TABLE 2 for the maximum allowable pressures on these sections for every model of Maxistab
range. These values are also written on the yellow decal labels applied on every stabilizer beam
nearby the ports of the extension cylinders (as shown on pict. 20).
A relief valve able to limit the pressure on the lateral extensions cylinders, is available and its features
are shown in the following section 12.3.1.
