Belarus 892 - Application of Rear Axle Differential Lock

892-0000010B OM
214
Use of tyre standard sizes unspecified by the manufacturer and operation of the chas-
sis with overload caused by excess of maximum bearing capacity of the tyres and tractor
axles (at given pressure and speed) can result in failure and damage not only to the chassis
(tyre carcass rupture, etc.), but also to other tractor units, or can cause accidents and the
overall tractor operating life reduction.
Constantly check the tyre pressure and adjust it if necessary with regard to specific
load and selected travel speed.
Permissible loads on the tractor tyres and internal air pressure values corresponding
to them depending on the travel speed are specified in subsection 4.2.8 “Selecting of optimal
inner pressure in tyres depending on operational conditions and load on tractor axles, in-
structions for use of tyres.”
In the specified case of the tractor application, exact amount of load that falls on the
front and rear wheels shall be determined according to section 5.9 “Determination of total
weight, loads on front and rear axles, tyres holding capacity and the required minimum bal-
last.”
Change of rated load on tyre depending on the speed is applied in cases when the
tyre is not operated for a long time with high torque. Tabular figures on the loads at the
speed of 30 km/h shall be applied for field work and other conditions of long-term operation
with high torque value.
Tire pressures above 0.16 MPa and less than 0.09 MPa are not recommended.
5.7.9 Application of rear axle differential lock
The tractor rear axle differential provides means for rotation of driving wheels with
different frequencies, which is necessary for moving along a curvilinear path and on a rough
road, when right and left rear driving wheels travel over different distance for the same time.
Disadvantage of differential is that it dispenses the torque on the wheels in inverse
proportion to tyres' grip on the road. If one wheel lands on the area with small adhesion
coefficient (for example, on ice), the wheel will slide and rotate with high frequency, while
the other wheel will rotate slowly. Tractor will move at a very low speed. To exclude this
disadvantage, the differential lock (excluding from the operation) is provided in positive
mode.
Tractor operation with differential locked on a firm and dry surface results in increased
loads of transmission and chassis components, and impedes maneuvering.
THE TRACTOR MUST NOT BE OPERATED WITH REAR AXLE DIFFERENTIAL
LOCK ENGAGED WHEN THE DRIVING SPEED EXCEEDS 13 KM/H!
THE TRACTOR MUST NOT BE OPERATED ON HARD-SURFACE ROADS WITH
CONSTANTLY ENGAGED REAR AXLE DIFFERENTIAL LOCK!