Belarus 1523, Operating Manual

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BELARUS-152 3/1523В /1523.3 /1523В.3 Aggregating the Tractor
196
Using the PTO
The PTO shaft is intended for driving the
active tools of the agricultural machines.
The tractors are equipped with the front
and rear power take-off shafts (PTO).
The front PTO is used either with the
front hitch coupler or its bracket (with no
links of the hitch coupler installed). It is
intended for driving the front-end ma-
chines/units (rotary cultivators, mowers,
pumps, etc.). The front PTO is installed
optionally. The rear PTO provides for
both independent and synchronous drive
of machines, while the front one – only
independent drive.
The rear synchronous PTO is only used
in those cases, when the MTA should
perform a certain number of operations
over a given path (for example, sowing)
and drive active wheels of machines
based on trailers and semi-trailers; in this
case, the tail-piece used does not matter.
The ground speed should not exceed 10
km/h.
ATTENTION!
• It is obligatory for the universal-
joint shaft drive of the agricultural
machines to be attached to have
safety elements (overrunning and
safety clutches). The choice of over-
running and safety clutches depends
on the type of the agricultural machine
to be used as well as on the MTA op-
eration mode. When the rear PTO is
employed at 540 rpm and the front
PTO at 1000 rpm. it is necessary to
install a safety clutch on the side of
the power take-up shaft (PTU); the
clutch restricts the power takeoff be-
yond the permissible limits (to no more
than 60 and 50 kW, max., respec-
tively). The safety clutch may be also
installed for protecting from overload.
To protect the PTO drive from over-
loading when combining the agricul-
tural inertial-type machines with the
tractor (pick-up presses, forage-
harvesting complexes and the like), a
universal-joint shaft together with an
overrunning clutch fitted on the PTU
side, shall be used.
• The telescopic universal-joint shafts
provide the transfer of torque. The
type of universal-joint forks and length
of the universal-joint shafts is deter-
mined in accordance with the distance
from the hitch point to the PTO and
the PTU and the method of coupling
of machines to the tractor. With the lo-
cation of the PTU with respect to the
PTO on the machine to be attached
which conforms to standards, em-
ployment of standard-make universal-
joint shaft is possible.
• It should be kept in mind that, when
the distances from the hitch point to
the PTO and the PTU differ (i.e.,
vastly larger or lesser), the uneven ro-
tation arises and the manoeuvrability
of the tractor-machine combination
suffers. Thus, it leads to reduced reli-
ability and violation of agricultural re-
gime of the MTA. In this case, it is
necessary to use a universal-joint
shaft with the constant speed joints (it
should be part of the agricultural ma-
chine kit).
• The PTO shall be disengaged:
1. After the MTA is stopped (provided
the operation cycle of the agricul-
tural machine to be attached is ter-
minated);
2. When the agricultural machine is
raised to its transport position (valid
for semi-mounted and mounted ag-
ricultural machines);
3. When making sharp turns (valid for
semi-mounted, semi-trailed and
trailed agricultural machines).
• It is recommended to disengage the
universal-joint shaft from the tractor
when on a prolonged running session
to other locations.