250
Model Code Page
31. Autocontrol 2.1
1. 4. 1997
6000--8750 312 2
15. 5. 1996
Picture 1. AC 2.1, control of Delta Powershift
A. Differential lock switch (as on AC II ).
B. PTO switch (as on AC II).
C. 4WD switch on the range gear lever knob (as on AC II).
Onlater tractors (spring ---96)the 4WD switch is placed on the
lever console on the driver’s right.
D. DPS push buttons on the speed gear lever knob
D1. DPS ---control unit (circuit card) (A10) in connection with
the power lift circuit card. The circuit card is accessible after
removing the power lift switch panel (see page 320/10). On
ACII system, there is a separate control unit box at the lower
end of the gear levers.
D2. Instrument panel combination instrument. DPS pilot lights
have been fitted in connection with other pilot and warning
lights. AC II system has a separate pilot light panel on the RH
side of th e instrument panel.
E. PTO emergency stop socket at the rear of the tractor (as on
AC II system)
F. S11E is the power lift forced--- lowering switch (see page
320/15).
Relays K11---K16 as on AC II system, see page 311/ 3.
If the tractor has a stop control (see page312/ 4), the stop cont-
rol relay K18 is placed by relay K11.
Important! If on AC 2.1 system one pilot lights starts to flash
when the driver changes the DPS ratio, this shows that there
is a wire break, poor contacts or a short circuit between the
solenoid valve in question and the DPS control unit (fault tra-
cing, see the next page). However, the tractor can be driven
with a DPS ratio, that functions i.e. the pilot light illuminates
continuously.
Solenoid valve resistance is 11---12 ohms. Measure the resis-
tance between pin 3 and pins 1 and 2 (pins, see the following
page). If the resistance is not correct, measure the resistance
once again from valve pins. If not correct, the solenoid valve
is faulty. If the resistance is correct, the possible fault can lie
in the diodes, which should be changed. If the resistance was
infinite, when it was measured from the upper end connector,
check solenoid valve wires and connectors (connector X13
under the hand brake console).
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