Central Reduction Unit - Belarus 3522.5 Operator's Manual

The fixture 8 with sealing 33 and rubber rings 7 serves for prevention of oil leakage
from FDA housing along universal-joint fork 34. In axle housing 13 doubled universal joint is
fixed by locking ring 30 and locking screws 43
The semiaxle shaft 12 with double-sided splines is mounted between the doubled
joint and central reduction unit differential. On the splines from the side of doubled joint
there is a collar, that prevent axial movement of semiaxle shaft. To prevent oil leakage
along semiaxle shaft splines from FDA beam in fork 34 of doubled joint are mounted blind
plug 31 and gasket 32. .
The planetary wheel hub drives 1 are connected with FDA housing with a help of axes
37 and can turn about FDA beam on two bearings 36. The axles are connected with axle
swivel of wheel hub drive by bolts 4 a rotary fist of a wheel reducer is carried out by means of
bolts 4. For adjustment of wheel hub drives turning angle are used bolts 44 and locking nuts 45.
The swivel bearings 36 are lubricated through oilers 6, mounted on axles 37. The
oilers are protected from dirt with rubber caps 5. To prevent dirt entry to bearings, in FDA
housing are mounted bodies 39 with rings 38. Bearings 36 adjustment is made by shim
wasers 2. Oil is filled in FDA housing to the bottom edge of filler opening in which is
mounted plug 27, you need to turn on drain plug 16 for drain. Front axle housing is
equipped with ventilation valve 14, that keeps up normal pressure in FDA beam.

3.12.2 Central reduction unit

The central reduction unit represents pair of bevel gears with circle arc tooth and is
intended for driving torque increase and torque transfer direction change. The drive gear
shaft 20 of central reduction unit main pair (figure 3.12.2) is mounted on casing of central
reduction unit on two conical roller bearings 12 and 14 between which are mounted dis-
tance piece 13 and adjusting washers 21.The follower gear 40 of main gear pair of central
reduction unit seat on center pilot of differential housing and fastens to it by bolts 1. Bend
off plates 2 serve for prevention of bolts unscrewing.
On end of drive gear shaft with splines is mounted flange 19 of forward driving axle
drive which fastens to drive gear 20 with a help of nut 17. On flange 19 is mounted mud
collector 16, that prevent dirt entry in work space of central reduction unit. To prevent oil
leakage in housing 10 is mounted sealing 15. To guarantee correct position of drive gear,
at assembling of central reduction unit is choose washer 11 of necessary size.
Differential is self-blocked, of excessive friction with displaced characteristic of
blocking properties which are shown only at tractor work with high traction loadings (tilling,
cultivation, etc.). There is no differential blocking at tractor movement on roads with hard-
covering at small traction loadings.
In housing 3 and differential cover 26 connected by bolts 34 are situated four planet
gears 37 on spider 39, side gears 4, frictional disks –9, driving frictional disks 22 and fol-
lower frictional disks 23, four spherical washers 38 and springs 6, that serve for differential
blocking only by raised traction loadings of a tractor.
The differential is mounted on central reduction unit housing boring two conical
roller bearings 7 and fix agaings axial movement by nuts 8.
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