MTZ 952.2 - 8. Determining the weight of the tractor, machine and ballast, loads on the traction hitch mechanism and mounted attachment, tyres and axles of the tractor and steerability criterion

Aggregation
MTZ series 900
144
8. Determining the weight of the tractor, machine and ballast, loads on the traction
hitch mechanism and mounted attachment, tyres and axles of the tractor and steera-
bility criterion
The tractor and its structural members including also tyres are designed for trouble-free
operation in a certain range of vertical loads and speeds specified in the Operation Manual
for the tractor. In case of failure to follow the recommendations concerning the loading and
speed modes of the tractor and tyres, the manufacturer does not guarantee its trouble-free
operation and warns about inadmissibility of such operation. Each pneumatic tyre is de-
signed for operation within a certain range of vertical loads. The width of this range is de-
termined by the size and design features of the tyres.
The most accurate and reliable method of determining the weight and loads con-
sists in weighing on the balance for motor transport means.
Attention!
The load on the mounted attachment, traction hitch mechanism, axles, tyres and body of the
tractor from the weight of the aggregated machines shall not exceed the maximum allowable
values specified by the manufacturer. Here the load on the front axle of the tractor in every
case of its use shall be always at least 20% of the own operating weight of the tractor with-
out ballast weights and water solutions in the tyres.
The practical determination of the weight of the tractor and machines and vertical loads
on the axles of the tractor is performed usually on any suitable balance having an appropri-
ate capacity and intended for heavy-load motor transport means. Weighing on the balance
makes it possible to determine also the real load on the coupling arrangements of the
trailed, semi-trailed and semi-mounted machines.
The value of vertical loads on the coupling arrangements of the trailed, semi-trailed and
semi-mounted machines can be determined by means of a special dynamometer. It is not
recommended to use a dynamometer for determining the load on the front and rear
axle due to large weight of the tractor.
Important: To determine the load on a certain axle of the tractor by means of a balance,
the tractor shall be placed so that the wheels of the axle to be measured would be on the
balance platform and the wheels of another axle – outside the weighting zone at the same
level with the platform. We recommend measuring the load on a separate axle of the tractor
within a MTA using the following technique:
Standard equipment A: Tractor with a rear-mounted machine or mountable ballast
weights; the front mounted attachment is not used.
 the front axle (with the rear mounted attachment lowered) is weighed;
 the rear axle (with the rear mounted attachment lifted) is weighed.
Standard equipment B: Tractor with a front-mounted machine or mounted ballast weights;
the rear mounted attachment is not used.
 the front axle (with the front mounted attachment lifted) is weighed;
 the rear axle (with the front mounted attachment lowered) is weighed.
Standard equipment C: Tractor with the front and rear machines and mounted ballast
weights.
 the front axle (with the rear and front mounted attachments lifted) is weighed;
 the rear axle (with the rear and front mounted attachments lifted) is weighed.