TROUBLE, EXTERNAL MANIFESTATION
CAB HEATING AND VENTILATION UNI T
Warm air does not enter the cab
No water circulation through the heating unit.
The valve is shut off – open it. Hoses are clogged –
clean them. Air or ice blockage in the heater hoses –
clean them. Fan has failed – contact a qualified special -
ist.
High-humidity heated air goes into the cab
Water leakage in the radiator and heating system joints.
Hoses are damaged.
The electromagnetic clutch of the compressor
(while turning the temperature regulator, no specific
metallic click is heard)
1 . The electric equipment is faulty.
Check the serviceability of the block of pressure
sensors using a tester or multimeter: there shall be
no open circuit between the leads of the block of
sensors (red and pink wires).
Check the integrity of the connections of the electric
circuits from the compressor clutch to the air-
conditioner control panel.
2. Coolant leakage has occurred.
Detect the place of the coolant leakage.
Detection of the coolant leakage places, replace-
ment of the hoses and components of the air-
conditioner shall be performed by trained personnel
with the use of special equipment.
The air-conditioner fan motor does not operate
The electric equipment is faulty.
Check the integrity of the respective fuse (25А, see
the electric diagram) in the fuse block F4 located in
the instrument dashboard. Replace the blown fuse.
Check the presence of voltage at the air-conditioner
motor using a test lamp when the switch is set to
the ON position and the storage battery is connect-
ed to the battery. If the electric circuits are in good
order, but no voltage is applied to the air-
conditioner, replace the switch.
When the air-conditioner is switched to the cooling
mode, warm air is supplied to the cab
Destruction of the seal of the cock П О -1 1 ( o r ВС11).
Replace the cock ПО-11 (or ВС11)
Coolant leakage from the ventilation compartment
of the cab
Rupture of the heater tubes (“unfreezing” of the
heater due to incomplete drainage during the opera-
tion with water in the cold season of the year).
Replace the climatic unit of the air-conditioner.
Insufficient air pressure in the tank, the pressure slowly grows and quickly drops when stopping
the engine
Air leakage in the system.
The compressor is faulty.
Remove and send it to the shop.
Air pressure in the tank decreases quickly when stepping on the brake pedal
The brake cock is faulty.
Remove and send it to the shop.
Increased oil ejection into the pneumatic system
The compressor is faulty.
Remove and send it to the shop.
No air intake for inflating the tyres
The air intake valve plunger is insufficiently sunk in the
pressure regulator.
Screw on the connection hose nut fully on the connecting
branch.
The pressure regulator has switched the compressor to
idling.
Reduce the pressure in the tank by 1.5...2 kgf/cm
2
.
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