Determination Of Pto Shaft And Cardan Shaft Applicability; Peculiarities Of Pto Shaft And Cardan Shaft Applicability - Belarus 922.6 Operator's Manual

4.8 Determination of PTO shaft and cardan shaft applicability

To avoid failures of PTO shaft and PRS in implements with active operating parts (tilling
rotary implements, combine harvester, mowers, cattle-feeders, pickup balers and etc.) mechan-
ical safety clutches are used.
Functional assignment of the safety clutch is automated gear deactivation or limitation of
the torque value transmitted from the PTO shaft to PRS under overloads caused by large start-
ing moment, overload (locks) of the operating parts and loads fluctuations on the PRS drive.
ATTENTION: THE RESPONSE TIME OF THE COUPLED IMPLEMENT SAFETY
CLUTCH SHALL EXCEED THE RATED OPERATING TORQUE ACTING FOR A LONG TIME
IN THE IMPLEMENT DRIVE, BUT BE ALWAYS EQUAL TO OR LESS THAN THE MAXIMUM
PERMISSIBLE PTO SHAFT END TORQUE! IF THE RESPONSE TIME OF THE IMPLEMENT
SAFETY CLUTCH EXCEEDS THE PERMISSIBLE PTO SHAFT END TORQUE, SUCH IM-
PLEMENT MUST NOT BE COUPLED WITH THE TRACTOR.
Note - The maximum permissible torques for all kinds of BELARUS-922.6 PTO shaft
ends are given in section 3.2.7 "PTO use".
Safety clutches are divided into cam clutches, frictional clutches, disk clutches, and they
can be subdivided into two basic types – with destructible and indestructible operating elements.
Clutches with a destructible element are used as unlikely overload control device.
ATTENTION: IT IS NOT RECOMMENDED TO USE CARDAN SHAFTS WITH SAFETY
CLUTCHES WITH A DESTRUCTIBLE ELEMENT FOR IMPLEMENTS COUPLING WITH
TRACTORS "BELARUS-922.6"!
In some implements freewheeling clutches are used. Freewheeling clutches (sprag
clutches) are automatically locked if the rotating direction is straight, and are unlocked if the ro-
tating direction is opposite. Freewheeling clutches provide operation of the implements with the
increased inertia moment of the implement rotating masses to prevent it from the drive failure
during the PTO shaft deactivation.
There are also integrated safety clutches. An integrated safety clutch is a safety clutch
which is structurally combined with a clutch of other type, for example with a free-wheeling
clutch.
ATTENTION: MANUFACTURER OF THE IMPLEMENT WITH CARDAN DRIVE FROM
THE TRACTOR PTO, SHALL INFORM YOU IN ADVANCE ABOUT THE NECESSITY OF
SAFETY CLUTCH USE, CLUTCH DESIGN PECULIARITIES AND CONSEQUENSES OF THE
IMPLEMENTS USE WITHOUT THE SAFETY CLUTCH!
While choosing (purchasing) and operating the cardan shaft, it is required to follow the
instructions of the implement and cardan shaft manufacturer first of all. It is recommended to
apply implements with active operating parts with the tractor, which have the length of the fully
displaced cardan shaft between hinge joint centers not more than 1 m.

4.9 Peculiarities of PTO shaft and cardan shaft applicability

WARNING: BE CAREFUL WHEN PTO SHAFT IS ACTIVATED AND THE CARDAN
SHAFT OF THE COUPLED IMPLEMENT IS ROTATING. IN CASE THERE ARE PEOPLE IN
THE AREA OF PTO SHAFT OPERATION, THEY OR THEIR CLOTHES CAN BE CLAMPED
BETWEEN THE IMPLEMENT ROTATING PARTS AND OTHER MOVING MACHINERY. THAT
CAN RESULT IN PERMANENT INJURY INCLUDING FATAL OUTCOME! FOR THIS REASON
BEFORE STARTING THE PTO SHAFT, MAKE SURE THERE ARE NO PEOPLE IN THE
DANGEROUS AREA BETWEEN THE TRACTOR AND THE IMPLEMENT. ALL KINDS OF
WORK CONNECTED WITH MAINTENANCE SERVICES (ADJUSTMENT, GREASING AND
ETC.), MOUNTING AND DISMOUNTING OF THE CARDAN SHAFT SHALL BE CARRIED
OUT WHEN THE TRACTOR PTO SHAFT AND ENGINE ARE OFF. BEFORE CARDAN
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