475
Model Code Page
37. Autocontrol 5 / 5.2
1. 8. 2000
370 17
6250--8950
1. 10. 1999
E. Checking DPS clutch pressures in AC
5and5.2
See also the setting orders on page 370/24D.
Note! If the DPS has malfunctions or if the DPS has been
repaired or the proportional valves have been changed, the
function of the control system must be checked. These
tests ensure, that the pressure in the tractor low pressure
circuit is high enough and that the DPS proportional valves
C1/C2/C3 are functioning.
Note! Ensure that the transmission oil temperature is
between +30˚C...+60˚C before work.
Note! The change of initial pressure index is not visible in
the pressure value (but affect the function of the DPS) (in
program versions 38, 40, 41). (Can be seen in other ver-
sions)
1. Measure pressure in the tractor low pressure circuit ac-
cording to instr. 911.
2. Activate the setting mode (see page 340/14).
3. Step with the DPS push buttons (in the speed gear lever
knob) and select no 7 (DPS1, clutch C1) (AC 5.2: no 10)in
the setting mode menu and confirm this selection with the
DPS pre---programming button.
7=initial pressure
calibration of DPS
clutch C1
8=clutch C2
9=clutch C3
10=C1 (AC 5.2)
11=C2 (AC 5.2)
12=C3 (AC 5.2)
Index digit
FIII=setting
mode symbol
4. When the initial pressure calibrating mode has been se-
lected and confirmed, number 7 (AC 5.2: 10) can be seen
in the left and index digit is blinking in the right.
C2
C1
31965400
33743900
5. Connect a pressure gauge of 25 bar onto the C1 clutch
pressure---test point (in the right), press again the DPS
pre---programming button (index stops to blink) and read
off the pressure gauge reading, which should be 1,8---2,8
bar.
Note! The pressure value can be read after ten seconds,
during which the pressure becomes even (in the beginning
possible pressure peak is not observed).
6. When the C1 clutch pressure has been checked, repeat
thesameproceduresalsowiththeC2andC3clutches.At
this time the blinking 7 is changed with the DPS push but-
tons to 8 (and 9) and confirmed with the preprogramming
button.
--- 8 (AC 5.2: 11)(DPS2,clutchC2).Initialpressurevalue
1,8---2,8 bar.
--- 9 (AC 5.2: 12)(DPS3,clutchC3).Initialpressurevalue
1,8---2,8 bar (AC 5) and little higher in AC 5.2.
Note! It is important that all DPS three proportional valves
are checked.
7. Escape from this mode by switching off current.
8. Move the speed gear and range gear levers to the neu-
tral. Start the engine and change the DPS---speed with the
push buttons. See the pressure rise in the pressure gauge.
The pressure must remain in the level, which is max. 0,05
MPa (0,5 bar) below the pressure in the low pressure cir-
cuit, e.g. 18,0 bar --->17,5 bar (measured in point 1). If the
presureislower,therecanbealeakageinthesystem(e.g.
o---ring damaged).
9. Check the DPS---pressures in the same way (instr.
370/3D).
10. Set the indexes according to instructions on page
370/24D.
11. Test---run the tractor according to instruction on page
370/24E.
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