Check And Adjustment Of Pneumatic System Pressure Regulator - Belarus 3522.5 Operator's Manual

3.10.3 Check and Adjustment of Pneumatic System Pressure Regulator

It is necessary to adjust pneumatic system pressure regulator during maintenance
No 3 (M3), also if pressure regulator operation is disturbed and also after its disassembly
for washing or replacement of worn out parts.
Check and adjustment of pneumatic system pressure regulator should be made
after service brakes control adjustment operation, after parking brake control and brake
valves actuators control adjustment.
Check pneumatic system pressure regulator in the following order:
- attach manometer (with scale factor of 0,01 ...0,02 MPa) and scale at least 1,6
MPa) to connecting head with red cover;
- take off cap 1 (fig 3.10.3);
- using a wrench screw cover 2 to the casing against the stop;
- switch on pneumatic compressor;
- start diesel engine and fill tanks with compressed air until safety valve 7 is actu-
ated at pressure 0,85... 1 MPa. If the valve is actuated at pressure less than 0,85 MPa or
more than 1 MPa, make its adjustment with screw 9, preliminary having loosened and then
having tightened the locking nut 8.
Adjust pneumatic system pressure regulator in the following order:
- by gradually unscrewing of the cover 2 adjust force of springs 3 and 4 so, that air
pressure in tanks, at which the unloading valve 6 is actuated, make 0,77 to 0,8 MPa;
- fix this position of cover 2 with a help of paint applied on treaded casing part and
put on the cap 1;
- slightly open condensate drain valve and lower air pressure to 0,65 ...0,7 MPa. At this
pressure values valve 6 should close and switch over pneumatic compressor for tanks filling
with compressed air;
- disconnect control manometer from the connecting head.
1 – cap; 2 – cover; 3 – outer spring; 4 – inner spring; 5 – filter; 6 – unloading valve;
7 – safety valve; 8 – locking nut; 9 –adjusting screw.
Figure 3.10.3 –Pneumatic system pressure regulator
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