Front Power Take-Off Shaft - Belarus 3522.5 Operator's Manual

3.8 Front power take-off shaft

The front power take-off shaft (FPTO) is intended to drive agricultural machines with
active working attachments, located on the front lift linkage. The front PTO provides 1000
rpm of shaft end extension speed under (2100 ± 50) rpm of the engine crankshaft speed
with 60 kW of power implementation. The rotation direction of the PTO shaft end extension
is clockwise when looked at its end.
The front power take-off shaft is executed as an independent unit and is a planetary
reduction unit with band brakes.
The torque to FPTO is transferred from the engine crankshaft to FPTO drive reduc-
tion unit 1 (figure 3.8.1) through an adapter 11 and a double pivot 3 with a splined shaft,
staying in engagement with the input shaft of the FPTO drive reduction unit 1, and a car-
dan shaft 5, connecting the FPTO drive reduction unit 1 with FPTO reduction unit 6.
The power in the FPTO reduction unit is transferred from an input shaft 7 to an end
extension 8 by means of the planetary drive.
The FPTO planetary reduction unit 6 is controlled by a hydraulic cylinder 9, linked to
a turn shaft 10, affecting band brake levers.
The hydraulic cylinder rod is moved as the oil flow direction in the distributor 1(figure
3.8.2) changes. The oil flow, coming via a delivery pipeline 2, goes either to a pipeline 3,
linked to the hydraulic cylinder rod side (FPTO disengaged – rod retracted), or to a pipe-
line 4, linked to the hydraulic cylinder head end (FPTO engaged – rod extended).
A fan 4 (figure 3.8.1) is driven from the engine crankshaft tail through the adapter
11, the doubled pivot 3 with the splined shaft, the reduction unit 1, a flange of the fan drive
shaft 2.
1 – FPTO drive reduction unit; 2 – flange of fan drive shaft; 3 – doubled pivot; 4 –
fan; 5 – cardan shaft; 6 – FPTO reduction unit; 7 – input shaft; 8 – shaft end extension; 9 –
hydraulic cylinder; 10 – turn shaft; 11 – adapter.
Figure 3.8.1 – Front PTO (mechanical part)
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