Pneumatic System; General Information - Belarus 3522.5 Operator's Manual

3.10 Pneumatic System

3.10.1 General information

The tractor BELARUS-3522.5 is equipped with the combined pneumatic drive pro-
viding brake control of trailers and agricultural machines, equipped both with single-wire
and with two-wire pneumatic brake drive. The pneumatic drive is used also for tires charg-
ing and other purposes where energy of compressed air is required. The configuration of
combined pneumatic drive is shown in figure 3.10.1.
1, 16, 15 – connecting heads; 2 – brake valve (two-wire); 3 –emergency air pres-
sure sensor; 4 –line from diesel engine inlet manifold; 5 – air bleed valves; 6 – pressure
regulator; 7 – condensate drain valve; 8 – cylinders; 9 – compressor; 10 – air pressure
sensor; 11 – brake valve (single-wire); 12 –control line; 13 – connecting line; 14 – feeding
line.
Figure 3.10.1 – Combined pneumatic drive of trailer brakes
The trailer brakes are driven in two modes – direct and automatic.
If the trailer with single-wire pneumatic drive should be connected, the trailer con-
necting head will be connected with the connecting head 16 (figure 3.10.1) with black
cover and air will come in trailer pneumatic drive. When pressing brakes pedals or at park-
ing brake application the compressed air will come out of the connecting line 13 in atmos-
phere through the brake valve 11. In the trailer will be actuated air distributor, delivering
compressed air from trailer tanks to the brake chambers, and the trailer brakes. At emer-
gency trailer detachment the connecting heads will be disconnected, air from the trailer
line comes out in atmosphere and the trailer automatically brakes.
If the trailer with two-wire pneumatic drive should be connected, the trailer connecting
heads will be connected with the connecting heads 1(with yellow cover) and 15 (with red
cover), that means with feeding line 14 and control line 12. Meanwhile compressed air con-
stantly comes to the trailer through the feeding line 14. When pressing brakes pedals or at
parking brake application the compressed air comes through the brake valve 2 and the con-
trol line 12 to the trailer. In the trailer will be actuated air distributor, delivering compressed air
from trailer tanks to the brake chambers, and the trailer brakes. Automatic brake control
(automatic braking) happens in case of hitch break and trailer disconnection because of
pressure loss in the feeding line.
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