Belarus 3522.5, Operator'S Manual

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3522.5-0000010 OM
309
7. Failures that may possibly emerge in the electrical facilities, hy-
draulic lift linkage and guidelines for troubleshooting
7.1 Possible failures in the electronic system for gearbox, rear axle differential
lock, front driving axle drive, front and rear power take off shaft control, and
guidelines for troubleshooting
List of possible failures in the electronic system for gearbox, rear axle differential
lock, front driving axle drive, front and rear power take off shaft control, and guidelines for
troubleshooting are shown in Table 7.1.
Table 7.1
Failure,
external manifestations, cause
Troubleshooting
One of the drives (RA DL, FDA, FPTO, RPTO) or a gear can not be engaged, or be-
comes disengaged after engagement
Short circuit in control valve solenoid
of a drive or a gear that is displayed
by single flash of the corresponding
power-on indicator (actuated by the
pressure sensor at the control valve
output)
- check the electric circuit for normal operation from
CECS to the respective control valve solenoid accord-
ing to the diagram (Annex C). In case a
failure
is de-
tected eliminate it.
- test the coil resistance of the respective control valve
solenoid, it shall be within the range from 4 to 6
Ohm. If the coil resistance is close to 0 Ohm, replace
the solenoid
Open circuit in the control valve sole-
noid of a drive or a gear – that is dis-
played by two-times flash of the cor-
responding power-on indicator (actu-
ated by the pressure sensor at the
control valve output) - check the electric circuit for normal operation from
CECS to the respective control valve solenoid accord-
ing to the diagram (Annex C). In case a
failure
is de-
tected eliminate it.
- test the coil resistance of the respective control valve
solenoid, it shall be within the range from 4 to 6
Ohm. If the coil resistance is close to infinite distance,
replace the solenoid
One of the drives (RA DL, FDA, FPTO, RPTO) or a gear can be engaged only for a
very short period (from 1 to 6 sec), or becomes disengaged after engagement
If the pressure in the transmission hydraulic system is
below the standard (pressure in the transmission hy-
draulic system shall make from 1.3 to 1.5 MPa), elimi-
nate the failure Pressure sensor, installed at a control
valve output of a drive or a gear, does
not respond. The failure is displayed
by three-times flash of the corre-
sponding power-on indicator
If the transmission hydraulic system is under a standard
pressure, remove the cable socket with the sensor
pressure and insert the bonding strip to simulate the
sensor response:
- if the error code indicator (three-times flash) is still
blinking, it is necessary to check the circuit to the pres-
sure sensor according to the diagram;
- if the error code indicator went out, the pressure sen-
sor shall be replaced by a new properly operating one
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