12
Safety
Centre of gravity
Observe the total weight, axle loads, tyre 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 tyre load-bea-
ring capacity to be exceeded. In order for steering capability to be
maintained, the front axle must bear at least 20 % of the tractor's em-
pty weight.
By investing some effort in making the calculations it is possible to de-
termine the:
•
Gross weight
•
Axle load
•
Tyre load-bearing capacity and
•
Minimum ballast
The following data is required to make this calculation:
Data from the tractor's operating manual:
Data from this operating manual:
Data which you can determine through measurement:
•
(A) Empty weight
•
(B) Front axle load
•
(C) Rear axle load
Please take into consideration, for example, the weight of water in
the tyres, accessories, etc.
•
(D) Total weight of the machine (rear attachment); the suppor-
ting load with the equipment attached
•
(E) Total weight of the machine (front attachment)
•
(F) Distance between the machine's centre of gravity (front at-
tachment) and the centre of the front axle
•
(G) Distance between lower link ball midpoint and the machine's
centre of gravity (rear attachment). With machines attached,
G=0.
•
(H) The tractor's wheel base
•
(I) Distance between the rear axle midpoint and the lower link
ball midpoint
(B)
Front axle
load
(A)
Empty
weight
(E)
Total weight of
front attachment
(D)
Total weight
rear attachment
(F)
Distance:
between centre of
gravity of front at-
tachment and
middle of front axle
(G)
Distance:
between lower link ball
midpoint and centre of gra-
vity of rear attachment
(H)
Wheel base
(C)
Rear axle
load
(I)
Distance:
between middle of rear
axle and lower link ball
midpoint
