7.5 Pressure check working hydraulics
Gremo 1250F/1450F Workshop manual
7.5.4
Checking pressure difference DeltaP (Dp)
Max. Pressure – Signal Pressure
Fig. 67 Checking pressure
difference DeltaP (Dp) Max.
Pressure – Signal Pressure
Go to the hydraulics window in GreControl and read Max.
pressure (above), signal pressure (below) and DeltaP (in
the yellow frame) or:
NOTICE
The check is performed by means of two 250-bar
manometers.
1. Connect manometer 1 (0-250 bar) to measuring point
PX Max. Pressure (position 1).
2. Connect manometer 2 (0-250 bar) to measuring point
PL Signal Pressure (position 2).
3. Start the diesel engine.
4. Run function Rotator counter-clockwise at steady
throttle until manometer 1 reads about 100 bar, and
then read manometer 2.
5. The pressure difference between manometer 1 and
manometer 2 should match the normal pressure for the
Pressure Difference PX-PL for the crane in question as
per table Table 4
Hydraulic pressure check: normal
6. If the pressure difference does not match the pressure
difference value in the table, adjust the pressure
difference as below.
7.5.5
Adjustment of pressure difference DeltaP
(Dp) Max. Pressure – Signal Pressure
NOTICE
During the warranty period, all pressure adjustment must
be carried out by your service provider in order for the
warranty to be valid.
NOTICE
Contact Gremo service if the max. pressure needs to be
adjusted on a machine with hydraulic pumps of the
"Rexroth" make. On a machine with hydraulic pumps of
the "Linde" make, the pressure is adjusted in
accordance with the description below.
1. Let the diesel engine run at normal rpm and run the
Rotator function counter-clockwise at full throttle.
96
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