Document 57.4402.8200 - 1
st
Edition 03/2007
INDEX
GYRO 4020 - 4518
TECHNICAL SPECIFICATIONS
2
26
2.22 HYDRAULIC CALIBRATIONS
.
PRELIMINARY OPERATIONS
Warm up the hydraulic oil to 60°C by keeping one of
the elements of the boom distributor to full stroke under
pressure.
To reach this temperature in a faster way, cover the oil
core of the radiator with a carton in the case of a water-
oil combined cooler, or the oil radiator if the machine is
equipped with a separate oil radiator.
2.
SETTING THE BOOM DISTRIBUTOR
Find the manometer mini-socket
ref. 30
on the
Tecnord
distributor (encl.
).
2. SETTING THE STAND-BY
Connect a 0-60bar manometer to the mini-socket
ref.
A
.
Calibrate valve
B
(encl.
4
) on the pump to 40 bar.
The operation shall be carried out with the engine
running at idle and without moving any lever of the
main valve.
2.2 SETTING THE DISTRIBUTOR PRESSURE
CONTROL VALVE
-
Remove the 0-60bar pressure gauge from the mini-
socket
ref. A
and fit a 0-400bar pressure gauge
before lifting the boom to end-of-stroke.
-
Calibrate the max pressure valve ref.
C
(encl.
) to
330 bar.
If it is not possible to reach 330 bar when setting the
main valve, tighten the valve ref. D (see encl. 4) of the
Hydromatik pump with variable displacement.
-
Once the main valve has been calibrated, proceed
with the calibration of valve ref.
D
(encl.
4
) of the
variable displacement boom pump to a value of 315
bar.
-
Recalibrate the max pressure valve ref.
C
(encl.
)
to 300 bar.
-
During calibration, check that the two safety valves
W
of the main valve (encl.
) discharge the pressure
exceeding 330 bar.
-
Remove the pressure gauge from the mini-socket
and re-tighten the protective cap.
3.
SETTING THE PRESSURE RELIEF VALVE
-
Connect a 0-60bar manometer to the mini-socket
ref. E
(encl.
2
) located on valve
ref. F
. With the
engine running at idle, move any of the element of
the main valve to end of stroke and then set the
valve ref.
F
to 30 bar.
-
Remove the pressure gauge from the mini-socket
and re-tighten the protective cap.
