Control Unit A1 And Display; Switches - Valtra 6000 Workshop Manual

37. Autocontrol 5 / 5.2
4. Checking AC 5 / 5.2 components
A. Control unit and display:
If the control unit is damaged, the conditions of other com-
ponents do not affect the function of AC 5. In case of fault
check that the unit connectors have not poor contacts by
disconnecting them and reconnecting.
Note! If the control unit must be changed, the tractor model
and ser. no. must be told to the factory. Also must be told, if
the tractor has a turbine clutch (HiTrol). Fitting the control
unit to tractor, see page 370/24A.
The control unit has not a battery, but its memory is so de-
signed that the programs remain in it, although should the
tractor battery be removed. If necessary, voltage measure-
ments can be done on the sides of the unit connectors
(without detaching the connectors). Three different units
have been used (33373000 and 33373010 in AC 5 and
33373020 in AC 5.2.
The diplay unit cannot be repaired but it is changed as a
complete unit. If the diplay does not function, check first
that the connector is correctly connected to the diplay unit.
If the display has malfunctions, check that connector A1A2
of the control unit is correctly in place and that there is
nothing extra between the connector parts. Check also the
display unit supply voltage, fuse 24 (tractors J38343---)
Connection points of reed ---relays
Lock relays with
Loctite 495.
CHECK OF SHUTTLE LEVER
= Direction of text on reed relay
Make a marking on
the relays before fit-
ting.
Magnet must be placed in
point shown in picture above.
140
Model
1. 8. 2000
6250-- 8950
1. 9. 2002
B. Switches:
Note! The switches and their wires can be checked in the
test mode FII, see table a on page 370/10 (AC 5) or page
371/8 (AC 5.2). Then the switch in question is activated
and in the diplay can be seen the mode (0/1) of the switch,
at which time the condition of the switch and its wires can
be verified.
If needed, the faulty switch is changed and wires are
checked/repaired.
The fault codes can show faults in different switches. Fault
codes, see page 370/6 (AC 5) or page 371/5 and 6 (AC
5.2).
Note! If the switches and wires seem to be OK, but a mal-
function exists, the fault may lie in the control unit.
Note! The shuttle lever/hand brake lever is a special switch.
When the lever is moved, the magnet in the inner end of the
lever moves onto the corresponding reed relay and the
desired function is engaged. The DPS pre ---programming
button is similar to the DPS and HiShift push buttons. The
reverse drive controls (TwinTrac) have the corresponding

switches).

Note! Check the function of the lever with a multi ---meter or
in the test---mode FII in connection with repairs.
Check marking A
Code Page
370 20
Note! Spring must not
touch the relays. Par-
king brake reed ---relay
must not touch the
magnet.