Section 7. Maintenance Procedures
Belarus 80.1/80.2/82.1/82.2/82
Р — Operation and Service Manual
89
7.6.14. MAINTENANCE OF THE VENTI-
LATION AND HEATING SYSTEMS
The ventilation and heating system includes
a fan in assy with an electric motor and ra-
diator, installed on the unitized cab roof. To
attain effective operation of the ventilation
and heating, be sure to fulfill the following
conditions:
1. With the cooling system filled up with
water, as a coolant, start up the diesel-
engine and run it at intermediate r.p.m.
for some time to warm up the water to
50-60 °
С. Then, open cock (1) (see Fig.
70
а), accelerate the diesel-engine and let
it run for 1-2 minutes, to fill the heater ra-
diator with fluid. Check to see that water
is circulating through the heater by open-
ing the right-hand drain plug (2) (see Fig.
70b). The heater radiator should start to
warm up. The level of coolant in the radi-
ator system should drop now.
2. Top up coolant in the radiator of the
cooling system, as required (50-60 mm
below the upper edge of the filler plug).
3. To achieve fast heating of the cab, turn
the heater fan ON and open the warm
air recirculation outlets.
4. To drain coolant from the heater and
the cooling system of the diesel-
engine, drive the tractor on a level
ground, open the heater cock (1), re-
move the diesel-engine radiator cap,
screw out the left- and right-hand drain
plugs (2), open drain cocks of the radi-
ator and the diesel-engine cylinder
block.
ATTENTION!
When using water as a
coolant in cold weather periods, blow
the heater system through with com-
pressed air to avoid the formation of ice
plugs, by, first, closing the radiator and
diesel-engine cylinder block water drain
cocks and refitting the radiator plug.
а)
b)
Fig.
70 а, b
Fig. 71
5. In warm weather the cock 1 should
be closed, while the system runs in
the ventilation mode.
6. Clean filter 3 (see Fig. 71), when re-
quired, but not less than once every
125 hrs of tractor operation. For di-
rections on cleaning the filter, refer
to a table on the filter bowl.
