Testing Proportional Valves (P1 - Valtra 6000 Workshop Manual

37. Autocontrol 5
J. Testing proportional valves (P1---P6) in the test mode in AC 5
NOTE! Corresponding tests in AC 5.2, see page 371/9B.
Note! When the proportional valves are tested, all solenoid outputs are connected automatically unenergised. Note! The PTO
proportional valve cannot be tested in the test mode in AC 5, but the solenoid is checked by measuring the resistance value.
Hint! E.g. value P4 1.8 means, that the forward direction proportional valve takes max. current of 1,8 A (in the test mode).
Example:
FII=test
mode
symbol
P1=DPS
proportional
valve no 1
(C1)
OUTPUT NAME
P1 (Y4) DPS ---solenoid Y4 (C1).
P2 (Y6) DPS ---solenoid Y6 (C2).
P3 (Y17)
DPS ---solenoid Y17 (C3).
P4 (Y11) Forwards solenoid Y11.
P5 (Y12) Rearwards solenoid Y12.
P6 (Y2) PTO solenoid Y2
* Although the current value is between the limiting values, can fault codes P101...P109 appear. In that case the AC5 ---con-
trol unit must be re ---programmed with a new main program file (versions 53 or 65) and the suitable parameter file (see page
370/24G). Newest program versions allow a little higher current values, because the higher current taken by a cold solenoid
could cause a fault code.
--- If one of the values in the diplay deviates from the given values, measure the solenoid resistance on the connector X13 pins
or direct on the valve pins. Measure so that the pins do not slacken (see instr. C on page 370/21). If the resistance is correct,
but the display reading is faulty, the fault lies in the wires.
Measure also the supply voltage of the control unit while the engine is running (1500 rpm). Correct value is 12 V ---14,8 V.
--- If the solenoid resistance was faulty, the solenoid is damaged and should be changed. When the proportional valve or the
solenoid is changed, the valve indexes must be checked (see page 370 ---24D).
If above mentioned points are OK, faulty current value can be caused by a defect AC5 / 5.2 control unit A1.
Note! Resistance measures and diode checks, see instr. 4C on page 370/21.
Important! Be careful not to mix up the proportional valves and normal solenoid valves during repair work.
WARNING! The proportional valves have a pin for a manual use, which MUST NOT be manipulated: the tractor may sudden-
ly start to move, or the pin can become trapped and can cause later damage to e.g. multi ---disc clutches. That is why it must
always be checked after the repair work (before engine start), that the proportional valve spools are in the outer positions i.e.
almost flush with the valve body (if not, remove the valve and press the spool so that the "manual pins" rises).
VALUE (activated) DESCRIPTION
Activate the test mode and start the engine. Set the
e g e speed to about 000 p engine speed to about 1000 rpm.
1,1---1,9 *
Proportional valve is activated by stepping the desired Proportional valve is activated by stepping the desired
solenoid and by pushing the pre ---programming but-
1,1---2,2
ton. The display reading should be between the limi- ton. The display reading should be between the limi-
(program versions (program versions
ting values.
53, 65)
--- If HI=short circuit or valve takes too high current.
--- If LO=wire damage
In AC 5: Cannot be tested in test mode. Measure re-
sistance, see page 370/21.
131
Model
1. 8. 2000
6250-- 8950
1. 9. 2002
Module A=AC 5
1.2=value within given
limits (1,2 A)
Code Page
370 13
F
A
d
P
C