The Required Minimum Ballast - Belarus 1523.5 Operator's Manual

4.12 Determination of total weight, loads on front and rear axles, tires holding ca-
pacity and the required minimum ballast
The amount of load on tractor axles in structure of MTU may be determined by direct
weighting on truck scales of the corresponding carrying capacity.
Tractor weighting on scales gives an opportunity to consider accurately weight distribution
of MTU masses along tractor axles of your configuration in different operating conditions:
"main operation" and "transport". While determination of loads on tractor axles, it is re-
quired to consider the technological load weight, for example the weight of seeds, distrib-
uted by a seeder.
For determination of load on tractor front and rear axles by weighting on truck scales, it is
necessary to place the tractor with the wheels of the measured axle on a weighting plat-
form, and the wheels of the other axle shall be kept out of the weighting area on the same
level with the platform.
The following formula is used for load determination:
, where
Т is load, N;
M is mass, kg;
g=9,8 is gravity acceleration, m/s
Calculation of load on front tractor axle:
, where
Т is load on front tractor axle, N;
f
is the amount of tractor operating weight with ballast (the unit installed), distributed on
tractor front axle, kg;
g=9,8 is gravity acceleration, m/s
Calculation of load on the rear tractor axle:
, where
Т is load on the rear tractor axle, N;
z
is the amount of tractor operating weight with the unit installed (ballast), distributed on
tractor rear axle, kg;
g=9,8 is gravity acceleration, m/s
Calculation of load acting on one front or one rear tractor wheel for selection of
pressure in tires:
а) during operation of tires on single wheels:
T
G 
f
;
G
f
2
tractor tire accordingly.
b) during operation of tires on twinned wheels
(considering the reduction of permissible load on a tire during operation of tires on twinned
wheels):
1,7 G twinned
f
G twinned =
..
f
where and
G G
сдв.
f
twinned wheels.
2
2
.
2
.
T

, where G and
Z
Z
2
=
G
.
f
G
f
1 7 ,
are calculated loads for tire inflation pressure during operation on
сдв.
Z
G are loads acting on one front or one rear
f Z
1,7 G twinned =
G
..
Z Z
G twinned
..
Z
127
1523.5-0000010 OM
G
=
Z
1 7 ,