Belarus 3522.5, Operator'S Manual

Page: 143 / 340

3522.5-0000010
РЭ
144
The transmission hydraulic system, besides power shifting, provides power fluid fil-
tration, lubrication of most loaded gears and transmission bearings under pressure, con-
trols front and rear power take off(PTO)shaft, front driving axle (FDA) drive, rear axle dif-
ferential lock and coupling clutch.
The transmission hydraulic system gear pump 3 (figure 3.11.2) with drive is
mounted on rear axle casing on the right side of transmission and rotates by gear system
from the engine.
The oil sucked by pump through suction bell 16, installed in gear box casing passes
through magnetic filter 5 consisting of magnet traps, intended for oil clarification from
metal particles.
Further oil is pumped in filtration system. The system consist of coarse mesh filter
14 (installed inside of GB), with filtering capacity of 80 microns and of consequently
mounted duplex filter 10 with filtering capacity of 25 microns. Besides filtering elements
mesh filter case is fitted with ball valve providing bypassing of power fluid at filter dirtiness
when inlet and outlet pressure difference makes more than 0,35 MPa. When filtering ele-
ments of duplex filter are clogged and inlet and outlet pressure difference makes more
than 0,4 MPa for bypassing of power fluid is installed warning valve At warning valve acti-
vation on CECS flashes control lamp, that indicates the necessity of change of filtering
elements of duplex filter. In duplex filter casing are consequently installed control valve,
adjusted on pressure in transmission control system of 1,5
+0,1
MPa and lubrication valve,
adjusted on pressure in lubrication system of 0,1-0,05 MPa. The valves are adjusted by
adjusting washers. One part of filtered power fluid under pressure of 1,5 MPa comes from
duplex filter through line 8 to electrohydraulic distributor 29, other part through line 26
comes to FDA control distributor 28. The distributor 28 is connected by line 13 with FDA
engagement clutch. At electrical open to FDA control distributor 28 front driving axle is
engaged. At the inlet of electrohydraulic distributor 29 stream splits-up. One part of the
stream from electrohydraulic distributor 29 through system of apertures and channels (at
operated proportional valves) comes to friction clutches that provides power shifting, DL
engagement (oil supply from distributor 29 to DL engagement clutch occurs through oil
pipeline 18 and further through system of apertures and channels in rear axle casing).
Other part of stream from the electrohydraulic distributor through oil pipeline comes to
clutch hydraulic booster (in figure 3.11.2 is not shown), and from it to a plate with front
PTO control distributor (in figure 3.11.2 is not shown). The third part of stream through oil
pipeline 22 from the electrohydraulic distributor 29 comes to rear PTO2 control distributor
and further through system of apertures and channels in rear axle casing comes to friction
clutches of PTO engagement and disengagement.
Also, part of a power fluid from duplex filter comes under pressure of 0,1 MPa through line
9 to electrohydraulic distributor and further through channels comes to disks of engaged
and disengaged clutches and to gear shift group bearings lubrication. From electrohydrau-
lic distributor through line 7 power fluid comes to gear shift group upper bearing lubrica-
tion. Other part of power fluid from duplex filter through line 11 through T-piece comes to
line 6 for gear box input, output and main shaft bearings lubrication and through line 24
goes to a plate 4. In plate 4 body is throttle for sprinkling of HLL and transmission HS
pupms drive. From line plate are directed to rear PTO bearings lubrication, to the differen-
tial 20 sprinkling and part to the rear PTO 19 sprinkling, to the pump drive bevel pinion
sprinkling and further part to the left final drive 21 sprinkling, to the right final drive 25
sprinkling. The drain after the greasing valve is carried out through a line 23.
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