Check And Adjust Drive Of Single-Wire And Two-Wire Brake Valves Of Pneumatic System - Belarus 920.4 Operating Manual

BELARUS-920.4/952.4
To drain condensate from the cylinder 13, the condensate drain valve 12 is provided. To
drain condensate, tilt the push bar with the ring aside and up.
Air bleeding from the pneumatic drive (to inflate tires etc.) is performed through the air
bleed valve 10 of the pressure regulator 11.
2.4.2.2 Check and adjust drive of single-wire and two-wire brake valves of
pneumatic system
ATTENTION: ADJUST THE BRAKE VALVE DRIVE WHEN THE SERVICE BRAKE
PEDALS ARE NOT PRESSED AND THE PARK EMERGENCY BRAKE IS COMPLETELY
DISENGAGED, WHICH MUST BE ADJUSTED FIRST.
Figure 2.7 — Check and adjust drive of single-wire and two-wire brake valves of pneumatic sys-
Check the drive of the single-wire brake valve "A" (Figure 2.7) as follows:
1. Connect a pressure gage scaled of not less than 1 MPa to the coupling head (with black
cap) of the tractor pneumatic drive.
2. Turn on the compressor and fill the cylinder with air to a pressure of 0.77 to 0.8 MPa as
per the pressure gage located on the instrument panel.
3. Air pressure as per the pressure gage connected to the coupling head must be 0.77 MPa
or higher or 0.53 MPa or higher for Hungary and Germany. If it is lower than specified, do as fol-
lows:
4. Check availability of clearance gap of 1 to 2 mm between the finger 2 (Figure 2.7) and
the upper edges of the grooves in the arms. If there is no gap, remove the cotter pin and remove the
finger 2 and adjust the length of the arm by turning the end 1(Figure 2.7).
5. Check and adjust as necessary pressing of the spring 3 to a size of 35±1.25 mm by rotat-
ing the nuts 4 and lock them. Check valve operation as per clause 3.
6. If air pressure as per the pressure gage connected to the coupling head has not reached
the required value, replace the brake valve "A".
ATTENTION: WITH THE BRAKE VALVE "A" (FIGURE 2.7) AND ITS DRIVE
CORRECTLY ADJUSTED, PRESSURE AS PER THE PRESSURE GAGE CONNECTED TO
THE COUPLING HEAD WITH A BLACK CAP MUST DROP TO ZERO IN CASE OF A FULL
TRAVEL OF THE INTERLOCKED BRAKE PEDALS OR WHEN THE PARK BRAKE IS
FULLY ENGAGED.
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