MTZ 1220.1, Operator'S Manual

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MTZ 1220.1/1220.3 K. Scheduled technical maintenance
K39
Operation 54. Maintenance of the cab
ventilation and heating system
For efficient operation of the ventilation
and heating system, perform the following
operations:
1. After pouring a cooling fluid (water) into
the cooling system, start the engine and
without opening the valve (1) on the left
side of the engine let the engine oper-
ate at medium speed to warm up the
coolant in the system to 50 to 60°C,
and then open the valve (1) to fill the
heat exchanger with the fluid.
2. Make sure that the fluid is circulating
through the heater, slightly opening the
drain plug (4) on the right side of the
cab. The heat exchanger must start
warming up, at that the coolant level in
the water heat exchanger of the engine
must drop.
3. Add the coolant to the heat exchanger
to the upper edge of the filler neck (Op-
eration 2, p. N7).
4. For a quick warm-up of the cab, switch
on the heater fan switch (3) and open
the recirculation valves (2).
5. To discharge the coolant from the
heater and the engine cooling system, in-
stall the tractor on an even surface, open
the heater valve (1), remove the cap of the
engine water radiator, remove the left and
right drain plugs (4) and open the drain
valves of the water radiator and the cy-
linder block of the engine.
6. During the warm season, the valve (1)
must be closed for operation of the sys-
tem in the ventilation mode.
ATTENTION! During the cold season, to
avoid ice plugs, if the cooling system is
filled up with water, blow the heating
system with compressed air, first closing
the valves for draining water from the
water radiator and the cylinder block of
the engine and install the water radiator
cap to place.