Belarus 3522.5, Руководство оператора

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3522.5-0000010
РЭ
126
The rear power take-off shaft (PTO) (figure 3.7.1) has a separate 1000 rpm drive of
the end extension for two modes – basic and economy. The torque to the rear PTO is
transferred from the engine by means of connecting shafts and splined bushings in the
gearbox and in the rear axle body. The rear PTO units are mounted in grooves of the rear
axle body and PTO cover 16. The rear PTO consists of hydraulically operated engage-
ment friction clutch and brake, two-speed gear reduction unit with mechanical shifting and
replaceable end extensions 19. The friction clutch serves to attach and detach PTO drive
shaft to/from the reduction unit. It consists of a shaft 27, which is simultaneously a friction
clutch body, of a splined clutch 1, of a thrust disk 2, of drive disks 3, mounted on splines of
the clutch 1, driven disks 4, mounted in grooves of the shaft 27 and of a spring-loaded pis-
ton 29, mounted in the friction clutch body and compacted with rings 5 and 31.
The brake serves to stop the PTO shaft end extension and consists of a body 25, in
which a spring-loaded piston 26 is mounted, compacted with rings 8 and 9, of a thrust disk
6 and of a drive disk 7, mounted on the splines of the friction clutch shaft. The reduction
unit consists of drive gears 11 and 14, mounted on needle bearings 10 and connected with
the shaft 27 by means of a splined bushing 13, and of a movable coupling 12, of driven
gears 22 and 23, mounted on splines of the shaft 24. The lubricant of the needle bearings
10 is delivered from the transmission lubrication system to channel “C” of the shaft 27
through bores in the covers 15 and 16. The PTO modes are switched over by means of a
shaft 33 and a fork 32, entering the slot of the movable clutch 12.
The replaceable shaft end extensions 19 are mounted in the inner splines of the
shaft 24 and are secured by means of the end washer 18 and bolts 20.
The PTO is actuated by the friction clutch. As oil is delivered through channel “M”
from the PTO control distributor the piston 29 compresses the pack of disks 3 and 4 and
rotation is transferred from the splined clutch 1 to the shaft 27, on the splines of which a
sleeve 13 is mounted with a splined clutch 12. As the shaft 33 rotates clockwise the fork
displaces the clutch 12 to the splines of the gear 14 (basic mode), as the shaft rotates
contraclockwise the fork displaces the clutch to the splines of the gear 11 (economy
mode). The shaft 33 is secured in engaged condition by means of the plate 34 and the bolt
35.
The economy mode is used to save fuel at engine partial modes when operating
with implements not requiring full power. 1000 rpm on the PTO shaft end extension are
provided by way of reducing engine speed to 1435 rpm.
As the oil delivery stops the piston 26 under the influence of the spring 30 returns to
its initial position, releasing the disks 3 and 4. The linkage between the drive shaft and the
shaft 27 gets broken and the PTO gets disengaged. The shaft end extension is stopped by
the brake as the oil is supplied under pressure via channel “T” from the distributor. The
spacer 17 serves to fix devices of cardanless power take-off drive (pulley, pump, etc.),
coupled with the tractor. The shaft end extension is covered with a removable cap 21.
ATTENTION: IT IS FORBIDDEN TO USE THE REAR PTO WITH THE PRESSURE
IN THE TRANSMISSION HYDRAULIC SYSTEM BELOW 1,3 MPA IN ORDER TO PRE-
VENT BREAKDOWN OF THE PTO FRICTION CLUTCH!
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