MTZ 1220.1/1220.3
Section D. Construction and Operation
D51
List of possible defects and methods of their check-up
Defect
code
Defect description, possible
cause
Defect check-up method
Complex defects
11
Fault in the circuit of control
the solenoid valve for lifting.
Open circuit in the winding
of the electromagnet (10) or
in the electromagnet control
bundle (Fig. D
-37).
Disconnect the bundle from the electromagnet and
check the electromagnet for open circuit by means of
a tester. The electromagnet resistance shall not ex-
ceed 2…4
Ω
. If the electromagnet is free of fault,
check the electromagnet control bundles for me-
chanical damage and check the wire from the elec-
tromagnet connector terminal to the terminal (2) of
the 25-contact connector of the electronic unit for
breakage by means of a tester.
12
Fault in the circuit of control
the solenoid valve for low-
ering. Open circuit in the
winding of the electromag-
net (9) or in the electro-
magnet control bundle (Fig.
D
-37)
Disconnect the bundle from the electromagnet and
check the electromagnet for open circuit by means of
a tester. The electromagnet resistance shall not ex-
ceed 2…4
Ω
. If the electromagnet is free of fault,
check the electromagnet control bundles for me-
chanical damage and check the wire from the elec-
tromagnet connector terminal to the terminal (14) of
the 25-contact connector of the electronic unit for
breakage by means of a tester.
13
Fault in the circuit of control
the solenoid valve for low-
ering or lifting. Short circuit
in one of electromagnets or
between the electromagnet
control wires in the bundle
(Fig. D
-37)
Disconnect the bundles from the electromagnets and
check the electromagnets for short circuit by means
of a tester. The electromagnet resistance shall not
exceed 2…4
Ω
. Alternatively, measure the electro-
magnet consumption current when applying the volt-
age of 6 V to the electromagnet. The current shall not
exceed 3.2
А
. Disconnect the connector from the
electronic unit and check the terminals (2) and (14)
for short circuit (when doing this, the electromagnets
shall be disconnected).
14
Fault in the control circuit of
the solenoid valves for low-
ering
and
lifting.
Wire
breakage in the electro-
magnet control bundle (Fig.
D
-37)
.
Check the system bundles for mechanic damages.
Disconnect the connectors from the electronic unit
and electromagnets and check the wire from the ter-
minal (6) of the electronic unit connector to the termi-
nals of connectors of the electromagnets. Check the
presence of the supply voltage on the terminal (5) of
the electronic unit connector (when doing this, the
engine shall be running). If the voltage is absent,
check the reliability of connection in the single-
terminal block with violet wire on the right under the
dashboard and fuse. The fuse is located in the me-
dium fuse block on the dashboard. The voltage is ap-
plied to the fuse after turning the switch of the starter
and instrumentation to the “instrumentation ener-
gized” position.
15
Fault of the remote control Check the bundles from the remote control buttons
Summary of Contents for 1220.1
Page 1: ...MTZ 1220 1 1220 3 1220 1 0000010 OM OPERATOR S MANUAL 2010...
Page 161: ...MTZ 1220 1 1220 3 Section I Coupling of implements I15...
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