Belarus 82.3 - Required Minimum Ballast

82.3-0000010 OM
145
4.12 Finding of total weight, loads on the front and rear axles, tire bearing ca-
pacity and required minimum ballast
Amount of load on the tractor axles in structure of MTU may be found by means of
direct weighing on vehicle scales of the corresponding carrying capacity.
Tractor weighing allows considering with accuracy weight distribution of MTU weight
between the axles of your tractor configuration in different operating conditions: “main op-
eration” and “transportation”. When determining loads on the tractor axles, the weight of
the technological load, for example weight of seeds for a seeder, shall be taken into ac-
count.
For finding the load on the tractor front or rear axle by means of weighing on vehicle
scales, it is necessary to place the measured axle’s wheels of the tractor on a weighing
platform, and other axle wheels shall be kept out of the weighing area on the same level
with the platform. Herewith the RLL shall be arranged as shown in clause 3.2.8.2.
The following formula is used for load determination
, where
- Т is load, N;
- M is mass, kg, and
- g=9.8 is gravity acceleration, m/s
2
Calculation of load on the tractor front axle
, where
- Т
f
is load on the tractor front axle, N;
- is amount of the tractor operating weight with ballast (unit installed), distribut-
ed to the tractor front axle, kg;
- g=9.8 is gravity acceleration, m/s
2
.
Calculation of load on the tractor rear axle
, where
Т
z
is load on the tractor rear axle, N;
is amount of the tractor operating weight with unit installed (ballast), distributed
to the tractor rear axle, kg.
- g=9.8 is gravity acceleration, m/s
2
.
Calculation of load acting on one front or one rear tractor wheel for choosing of
pressure in tires:
а) during use of tires on single wheels
2
f
f
T
G =
;
2
Z
Z
T
G =
, where
f
G
and
Z
G
are loads, acting on one front or one
rear tractor tire accordingly.
b) during use of tires on doubled wheels:
(with due account for a permissible load on a tire during use of tires on doubled
wheels):
1.7
f
G
doubl.=
f
G
1.7
Z
G
doubl.=
Z
G
f
G
doubl.=
7,1
f
G
Z
G
doubl.=
7,1
Z
G
where
f
G
doubl. and
Z
G
doubl. are calculated loads for choosing of pressure in
tires during use of tires on doubled wheels.