Front Power Takeoff Shaft - Belarus 1822.3 Operator's Manual

3.7 Front power takeoff shaft

The front power takeoff shaft is mounted on the tractor upon request. The FPTO is
intended to drive agricultural machines with active working units, located on the front lift
linkage. The front PTO has an independent drive with clockwise rotation of the PTO shaft
end extension when looked at its end, and provides 1000 rpm of shaft end extension
speed under 2100 rpm of the engine crankshaft speed with 44 kW of power implementa-
tion.
The front power take-off shaft is executed as an independent unit and is a planetary
reduction unit with band brakes, mated with a parallel-shaft reduction gear unit.
The torque to FPTO is transferred from a pulley 1 (figure 3.7.1) of the engine crank-
shaft to PTO reduction unit 9 through a spacer 2, secured on the crankshaft, an expansion
clutch 3, installed in the spacer 2, and a splined shaft 4, secured in a clutch 5, which can
be fixedly displaced in axial direction and which is mounted on the input shaft 8 of the PTO
reduction unit.
The power in the FPTO reduction unit 9 is transferred from the input shaft 8 to the
end extension 12 by means of cylindrical meshing and planetary drive.
The PTO planetary reduction unit 9 is controlled by a hydraulic cylinder 11, fastened
on the reduction body and linked to a turn shaft 10, affecting band brake levers.
1 – engine crankshaft pulley; 2 – spacer; 3 – expansion clutch; 4 – splined shaft; 5 –
clutch; 6 – spring; 7 – bushing; 8 – input shaft; 9 – PTO reduction unit; 10 – turning shaft;
11 – hydraulic cylinder; 12– shaft end extension; 13 – ball.
To link the reduction unit to the crankshaft it is required to shift the bushing 7 (figure
3.7.1) to the engine side, having compressed the spring 6, and move the clutch 5 with the
shaft 4, bringing it into mesh with the expansion clutch 3 until the balls 13 are fixed by the
spring-loaded bushing 7 in groove A.
The shaft 4 is brought out of meshing with the expansion clutch 3, mounted on the
engine crankshaft, in a similar way.
If the FPTO is not used on the tractor, its drive shall be disconnected from the en-
gine crankshaft in order to reduce engine load and ensure long service life of the front
PTO components.
Figure 3.7.1 – Front PTO (mechanical part)
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