Great Plains | 151-144U | 2019/03/14
14
3P1006NT
Preparation and Setup
Distance from Center of Gravity
Observe the total weight, axle loads, tire load-bearing
capacity and minimum ballast specifications.
The front or rear attachment of machines must not
cause the tractor’s permissible total weight, its
permissible axle load, or its tire load-bearing capacity
to be exceeded. In order for steering capability to be
maintained, the front axle must bear at least 20% of
the tractor’s unladen weight.
By investing some effort in making the calculations,
you can determine the:
total weight
axle load
tire load-bearing capacity
minimum ballast
For this calculation, the following data is required:
Data from the tractor’s operator manual:
(A) Unladen weight in kg.
(B) Front axle load in kg.
(C) Rear axle load in kg.
Take into consideration any further weights, such as
water in the tires, additional equipment, etc.
Data from this operator manual:
(D) Total weight of the machine in the rear
attachment. For hitched machines, the
supporting load in kg.
(E) Total weight of the machine in the front
attachment in kg.
(F) Distance between the machine’s center of
gravity in the front attachment and front axle
midpoint in m.
(G) Distance between the lower link ball midpoint
and the machine’s center of gravity in the rear
attachment in m. With hitched machine:
Maximum empty (main seed box, dual seed or
native grass, and small seeds) - G=1.48 m.
Minimum empty (main seed box only) -
G=1.47 m.
Data to be measured:
(H) Tractor’s wheel base in m.
(I) Distance between the rear axle midpoint and
the lower link ball midpoint in m.
Calculations
The values (A) to (I) can be inserted in the formulas.
Ballast with front weights
Calculation of the ballast with front weights for
rear-mounted machines.
Front ballast in kg:
Ballast with rear weights
Calculation of the ballast with rear weights for
front-mounted machines.
Rear ballast in kg:
Front axle load
Calculating the actual front axle load (J)
Front axle load in kg:
Total weight
Calculating the actual total weight (K).
Total weight in kg:
Rear axle load
Calculating the actual rear axle load (L).
Rear axle load in kg:
D
I
G
+
B H
–
0.2 A H
+
F
H
+
--------------------------------------------------------------------------------------
E F
C H
–
0.45 A H
–
H
I
G
+ +
------------------------------------------------------------------------------
E
F
H
+
B H
D
I
G
+
–
+
H
------------------------------------------------------------------------------------------
K
E
A
D
+
+
=
L
K J
–
=