Determination Of Total Weight, Loads On Front And Rear Axles, Tires Holding Capacity And The Required Minimum Ballast - Belarus 2022.6 Operator's Manual

4.12 Determination of total weight, loads on front and rear axles, tires holding
capacity and the required minimum ballast
The amount of load on tractor axles in structure of MTU may be determined by di-
rect weighting on truck scales of the corresponding carrying capacity.
Tractor weighting on scales gives an opportunity to consider accurately weight dis-
tribution 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 required to consider the technological load weight, for example the weight of seeds,
distributed 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 platform, 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), distrib-
uted 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), distrib-
uted 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
f
G =
;
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 G and G
сдв.
f
twinned wheels.
T
=
Z , where G and
Z
2
= G
.
f
G
f
1 7 ,
are calculated loads for tire inflation pressure during operation on
сдв.
Z
2
2
.
2
.
G are loads acting on one front or one rear
f Z
1,7 G twinned =
G
..
Z Z
G
G twinned =
..
Z
1 7 ,
136
2022.6-0000010 OM
Z