Belarus 80.1 Operation Manual page 205

It is permitted to enter one non-fixed value in the range:
for "Z" - from 23 to 69;
for "I" - from 1.000 to 4.000;
for "R" - from 400 to 1000;
for "K" - from 2.360 to 4.000;
for "KV2" - from 0.346 to 0.600;
for "ZV" - from 12 to 99;
for "V" - from 0 to 1000.
The list of programmable factors (graphical methods of revealing the parameters
and their values in the programming mode):
In tractor operation, it is allowed to change the value of parameter "wheel rolling radius
R", which is defined based on the tyres installed on the tractor by means of measuring the dis-
tance between the wheel center and the ground.
Parameter "Z"
Z is the number of teeth of the final shaft gears of the driving wheels
(right and left), above which speed (rpm) sensors are installed
Parameter "I"
I is the increasing factor for transmission ratio of wheel gear group
Parameter "R"
R is the rolling radius of the rear wheel, mm. While re-programming,
this parameter can be changed with intervals of 5mm.
Note – 770 is the value for 18.4R34(F-11) tyres mounted on BEL-
ARUS-820 tractors. 750 is the value for 15.5R38 tyres mounted on
BELARUS-80.1/82.1 tractors. If mounting other tyre types, set the
value of parameter R that corresponds to the rolling radius of the
tyres installed.
Parameter "K"
K is the transmission radio of the alternator drive
Parameter "KV2"
KV2 is the transmission radio of the power take-off shaft
Parameter "ZV»"
ZV is the number of teeth on the gear of PTO speed sensor
(Note – if the sensor is not installed, the value 0 is entered)
Parameter "V"
V is the fuel tank volume, l
Furthermore, in the programming mode, pressing the button "Parameter"
displays, in the list of programmable parameters, the independent pa-
rameter T of detailed readings of the counter of engine operation elapsed
time. This parameter cannot be changed; it represents a precise (up to
1/100 hour) value of engine operation time
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80-0000010B OM