2122.6-0000010 OM
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2.15.7 Annunciation for accident conditions of transmission and HLL
hydraulic system, troubleshooting of emergency on-board voltage
Annunciator for duplex filter dirtiness of transmission hydraulic system 20 (figure
2.15.1) gets actuated at high level of duplex filter dirtiness. It is necessary to replace the
duplex filter filtering cartridges for transmission hydraulic system and rinse the mesh filter
of transmission hydraulic system.
Annunciator for HLL pump filter dirtiness 18 gets actuated (and further operates in
the mode of continuous glow) at high level of HLL pump filter. It is necessary to replace the
HLL pump filter.
ATTENTION: SHORT-TIME ACTUATION OF ANNUNCIATORS 18 AND 20 IS AL-
LOWED WITH COLD OIL IN THE TRANSMISSION AND HLL HYDRAULIC SYSTEM
WHICH IS NOT A SIGN OF FAILURE!
Annunciator for emergency oil level in HLL tank 19 gets actuated at oil level de-
crease in the HLL tank below the permissible level.
Annunciator for emergency oil temperature in HLL tank 23 gets actuated at oil tem-
perature increase in the HLL tank above the permissible level. Apart from that, at oil tem-
perature increase in the HLL tank above the permissible level, annunciator 18 lights up
and operates in flashing mode.
In case emergency annunciators for hydraulic system 19 or 23 light up, it is required
to stop operation, detect and eliminate the reasons for accident condition appearance in
order to avoid breakage and failure of hydraulic system units.
Note – Annunciators 18, 19 and 23 get actuated at combined sensors layout as fol-
lows:
- of level/temperature in the HLL tank;
- dirtiness/temperature on the HLL pump.
If an emergency temperature sensor is mounted in the HLL tank, then annunciator
19 (figure 2.15.1) gets actuated at permissible temperature excess. By doing so, annuncia-
tor 23 does not switch on.
If a dirtiness sensor for pump filter is mounted on the HLL pump, then annunciator
18 lights up at its actuation. By doing so, emergency oil temperature control in the pump is
not carried out.
ATTENTION: AT VOLTAGE SUPPLY INCREASE OVER 18V, ANNUNCIATOR
FOR EMERGENCY VOLTAGE SUPPLY LIGHTS UP, CECS GETS COMPLETELY
SWITCHED OFF (CONTROL FOR ALL DRIVES AND GEAR BOX IS REMOVED) AND
OPERABILITY IS RECOVERED AT POWER VOLTAGE DECREASE LESS THAN 17V!
AT VOLTAGE SUPPLY DECREASE LESS THAN 9V, CECS GETS COMPLETELY
SWITCHED OFF (CONTROL FOR ALL DRIVES AND GEAR BOX IS REMOVED) AND
OPERABILITY IS RECOVERED AT POWER VOLTAGE INCREASE OVER 9V!
When any of annunciators 18, 19, 20, 23 or 24 is switched on, an audible device
(buzzer) gets actuated. It is possible to switch off an audible device for some time, for
which it is required to press button 22 for a short time, by doing so an annunciator for
buzzer switching off, located on the left of button 22, gets switched on and goes out. It is
necessary to keep in mind that during further CECS switching on and actuation of accident
condition sensors, an audible device shall get switched on until the corresponding failure is
eliminated or the corresponding filter cartridge is replaced.
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