128
c) Pressure maintaining
With the help of the corresponding impulse gate to outlet 3 closes during reversing of
magnet II of valve “h”. Compressed air from A chamber goes again through hole “d” to the pre-
liminary control chamber “g”, and diaphragm “f” closes discharge hole “e”. Thus, locking of
pressure raise or drop in chamber B is performed, and consequently, in brake cylinders.
4.5.2.9 Coupling Heads.
The heads have caps that protect the system from dust and dirt.
Feeding head cap is painted red, control head cap is painted yellow. For correct coupling of the
trailer brake system connect heads according to their colour.
First control head (yellow) is uncoupled, and then feeding head (red) is uncoupled. Un-
couple semi-trailer pneumatic drive in the reverse order.
4.5.2.10 Control Outlet Valves
. Control outlet valves are shown in Figure 109, designed
to determine air pressure parameters at the outlet for each circuit through check pressure gauges.
To connect to the valve use hoses with coupling nut M16x1.5 and pressure gauges with
measuring range 0-1000 kPa (0-10 kgf/cm
2
).
1-Valve case; 2-cap; 3-hook
Figure 109 - Control Outlet Valve
4.5.2.11 Maintenance of Pneumatic Brake System Drive
General
When maintaining the pneumatic brake system drive of the truck, first check the
tightness of the system as a whole and its elements. Pay special attention to tightness of pipeline
connections and flexible hoses and hose connections. Large air leakages are detected by ear, and
small air leakages are detected with soap solution. Leakage is eliminated by tightening connecting
nuts with the torque:
- for 10 mm pipelines - 21.6-27.5 Nm (2.2-2.8 kgfm);
- for 14 mm pipelines - 49-60.8 Nm (5.0-6.2 kgfm).
To avoid connecting boss damage on the brakes tightening torque of fittings, angles and
other flanges should not exceed 30-50 Nm (3-5 kgfm).
Summary of Contents for 4320M
Page 1: ...URAL 4320М TRUCK and its Modifications ...
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Page 177: ...Figure 140 Installation of left and right side safety devices 171 ...
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