Buzzer Functions - Valtra 6000 Workshop Manual

31. Autocontrol 2.2 / 2.3
1. Fault tracing
A. General
Note! In connection with malfunctions fuses F6, F8, F11,
F22 and F27 must be checked, which affect the function of
the AC 2.2.
Important! If in AC 2.2 a pilot light (I, II or III) of engaged
DPS ratio starts to flash, this indicates that the wires bet-
ween the solenoid valve (Y4 or Y6) in question and the cir-
cuit card A10 of DPS have poor contacts or there is a short
circuit in the solenoid valve or in wires. Tractor driving can
be continued with a such DPS ratio, which is functioning i.e.
the pilot ligts illuminates without flashing.
If one of the DPS pilot lights is flashing, so:
--- check that the 18---pole connector is correctly fastened to
the DPS circuit card A10 (the circuit card is placed under
the ACB---power lift switch panel).
--- check solenoid valves Y4 and Y6 and their wires and
connector X13 on the support plate in the lever console
(pins, see wiring diagram).
Solenoid valves:
Y1: diff. lock (magnetic, when diff. lock is engaged)
Y2: PTO (magnetic when PTO engaged)
Y3: 4WD (magnetic when 4WD disengaged)
Y4: DPS (magnetism depends on transmission type, see
picture on the next page, +=magnetic)
Y6: DPS (magnetism depends on transmission type, see
picture on the next page, +=magnetic)
Position of the solenoid valves on the valve block (on the
LH side of the gearbox housing), see e.g. picture 5 on page
440/13.
The resistance value of all solenoids is 11 ---12 ohms. If the
transmission control system has malfunctions, check the
solenoid valves. The reisistance of the valves can be mea-
sured on the wire loom connectors (e.g. X13), but if it is
infinite, it must be measured on the valve pins, so that pos-
sible breaks can be verified.
If the resistance value is OK when measuring on the valve
pins but the resistance is zero when measuring between
pins 3<>1 or 3<>2 of DPS circuit card connector A10,
the diodes are in short circuit and they must be replaced
(solenoid valve diode housing V1, see e.g. picture on page
310/6C). In AC 2.3 diode housing V3 is for solenoid valves.
Supply voltages of DPS circuit card A10:
If the DPS has engaging problems, make sure that the DPS
circuit card gets supply voltages by measuring it on pins of
connector A10 (DPS circuit card):
--- pin 3: continuous ground
--- pin 4: 12 V via ignition switch
--- Pin 6: 12 V via fuse F22 and ignition switch
--- pin 11: 12 V continuous voltage via fuse F11
Check also earth points GR1 and GR5)
If no supply voltage exists, check the condition of the batte-
ry and check supply wires and various components in the-
se circuits.
1. 6. 1999
B. Buzzer functions
The buzzer notifies, when parking, that the parking brake
must be applied (engine stopped) or that a driver does not
drive with applied parking brake (engine running). The buz-
zer also alarms if the head lights remain on after the current
is switched off.
Testing method:
--- start the engine (oil pressure up)
--- apply parking brake. The buzzer alarms at intervals of 5
seconds.
--- switch on the head lights. Stop the engine and switch off
current (oil pressure down). The buzzer starts to alarm
about once or twice per second. Switch off the head
lights, at which time the buzzer stops to alarm.
--- release parking brake. The buzzer starts to alarm conti-
nuously
The buzzer is fitted on the DPS circuit card A10.
The buzzer can be tested in the loose circuit card as follows
(see picture on the next page):
--- Ground pin 3 and feed voltage of 12 V to pin 11.
--- Ground pin 13 and feed voltage of 12 V to pin 4, at which
time the buzzer must give continuous signal. Disconnect
pin 4, after witch the buzzer should alarm about 2 min.
--- Remove ground from pin 13 and ground pin 12 and feed
a voltage of 12 V to pin 4, after which the buzzer should give
discontinuous sound signal.
--- Feed pin 10 with 12 V and disconnect pin 4, after which the
buzzer must give discontinuous alarm signal.
Note! If the buzzer is damaged, the whole DPS circuit card
A10 must be replaced.
276
Model Code
6200-- 8150 314
Page
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