Models
Revision 03-2012
48
Toucan 1210
Toucan 1310
HYDRAULIC SYSTEM
3
3
3.19 Pressure relief valves
The pressure relief valves are used to protect the
hydraulic system against excessive pressures (within
the circuit in which they are used) by returning the
hydraulic oil to the reservoir when the setting pressure
is reached.
NOTE
Adjustement of a pressure relief valve setting
should only be performed by qualified
mechanics using the correct equipment - only
after the need for adjustment has been
established.
The table titled
Relief Valve Pressure Settings
lists
main and circuit relief valve pressure settings. If the
pressure setting of any relief valve is not ± 5 bars of
the setting listed in the table, adjust valve as necessary
(unless otherwise specified).
Identification of the pressure relief valves on the
function manifold
: see § 3.4.
Identification of the pressure relief valves on the
brake manifold
: see § 3.6.
Identification of the pressure relief valves on the
steering manifold
:
see § 3.11.
Identification of the pressure relief valves for the
slewing movement
: see § 3.18.
For the adjustment of the pressure relief
valves, the movements must be performed
at MAXIMUM SPEED.
NOTE
For a correct verification of a relief pressure,
the locknut of the relief valve adjustment
screw must be tightened.
To adjust a pressure relief valve, turn the
adjustment screw until the correct setting is
reached (tighten to increase the pressure).
Preparation
Before performing any adjustment on relief valves,
warm the oil between 25°C and 50°C.
Use a pressure gauge from 0 to 40,0 MPa (400 bar)
to adjust pressure relief valves. For pressures below
3 MPa (30 bar), use a pressure gauge from 0 to 6
MPa (60 bar).
! CAUTION
Function
Opening pressure
Pressure relief valve
Check at port "M" on
General pressure
23 Mpa (230 bar)
PR1
Function manifold
Telescope extension
15 Mpa (150 bar)
PR2
Function manifold
Telescope retraction
18 Mpa (180 bar)
PR3
Function manifold
Mast elevation
18 Mpa (180 bar)
PR4
Function manifold
Jib elevation
16 Mpa (160 bar)
PR5
Function manifold
Jib lowering
18 Mpa (180 bar)
PR6
Function manifold
Brake piloting max pressure
35 bar
Max. peak pressure
PR7
Brake manifold
Drive at low speed
11 Mpa (110 bar)
PR8
Function manifold
Slewing to the left
11 Mpa (110 bar)
PR9
Function manifold
Slewing to the right
11 Mpa (110 bar)
PR10
Function manifold
Trim correction
18 Mpa (180 bar)
PR11
Trim correction manifold
Steering to the right
14 Mpa (140 bar)
PR12
Function manifold
Steering to the left
14 Mpa (140 bar)
PR13
Function manifold
PRESSURE RELIEF VALVE SETTINGS T1210 - T1310
