MTZ 1220.3 - Page 98

MTZ 1220.1/1220.3 Section D. Construction and Operation
D50
Fault Diagnostics
The BOSCH electronic hydraulic control sys-
tem is provided with the self-testing capability
and issues the code information to the opera-
tor by means of the diagnostics indicator (8)
(Fig. E-35b) on the RHL control panel. In
case of absence of faults, the indicator is il-
luminated continuously after starting the en-
gine. After upward or downward manipula-
tions of the RHL control handle (7) (Fig. E-
35b), the indicator is switched off. On shifting
the control handle downwards, the green in-
dicator (6) (Fig. E-35b) of lowering the RHL
lights up; on shifting the same upwards, the
red indicator (5) (Fig. E-35b) of lifting the
hitch linkage lights up.
Should there be some faults in the system (after
starting the engine) the diagnostics indicator
starts to issue the code information about the
fault and, if necessary, the operation of the sys-
tem is locked.
The fault code is issued as a two-digit num-
ber, the first digit of which is equal to the
number of indicator blinks after long pause
and the second one – to the number of indi-
cator blinks after short pause. For example,
long pause – three blinks of the indicator,
short pause – six blinks of the indicator. It
means that in the system there is a fault un-
der the code “36”. Should there be several
faults, the system indicates the fault codes
one after another with separating them with a
long pause.
All the faults are divided into the three
groups: complex, medium and light.
On detecting complex faults, the control is
ceased and the system is switched off. The
system cannot be controlled from the control
panel and remote control buttons. The diag-
nostics indicator issues the fault code. After
elimination of the fault and starting the en-
gine, the operation of the system is resumed.
In case of medium faults, the control is ceased
and the system is locked. The system cannot be
controlled from the main control panel, but can
be controlled from the remote control buttons.
The diagnostics indicator issues the fault code.
After elimination of the fault and starting the
engine, the operation of the system is re-
sumed.
In case of light defects the diagnostics indi-
cator issues the defect code. The system is
not locked and can be controlled. After elimi-
nation of the defect, the diagnostics indicator
goes out.
When the system detects a fault, proceed as
follows:
1. Stop the engine;
2. Set the controls on the main control panel
as follows
(Fig. E-35b):
• handle (7) for controlling the hitch link-
age – to the “off” position;
• handle (3) for controlling the lifting limi-
tation – to the “minimum lifting” position;
• handle (4) for controlling the soil treat-
ment depth – to the “minimum depth” po-
sition;
• handle (1) for controlling the lowering
speed – to the medium position;
• handle (2) for controlling the “draft –
position” mode – to the medium posi-
tion.
3. Start the engine and, if there are no defects,
proceed to work. If the defects have not been
eliminated, perform the system diagnostics
and eliminate the faults.
The possible defects and methods of their
check-up are given in the table below.
The connection diagram of the RHL control
system is shown in Fig. E-37.
ATTENTION!
1. The electric connectors of the control sys-
tem of the hitch linkage shall be only discon-
nected when the engine is stopped
2. 2. The specified voltage values shall be
measured when the engine is running with
observing the safety precautions for working
with energized electric appliances.
3. 3. The contact numeration in the bundle
connectors is indicated on the parts of the
connector bodies