MTZ K-744R1, Руководство по эксплуатации

Страница: 144 / 202

KIROVETS K-744R1, K-744R2, K-744R3, K-744R4 tractors
144
In winter it is necessary to see for condensate drainage especially thoroughly in order to avoid
its freezing in the drive tubes.
Check the operation of the tractor pneumatic system
a) Fully release air from the pneumatic air by pressing several times the brake pedal.
b) Start the engine and transfer the level of manual fuel feed into the position of
crankshaft maximum rotational speed and switch on the chronometer.
c) Fill air into the system to the maximum pressure to be determined by termination of
movement of the air pressure gauge pointer, which is noticeable by eye. Being in
serviceable condition and having the normally adjusted pressure regulator, the
compressor shall fill the system to the pressure of 0.65
–0.8 MPa (6.5–8.0 kgf/cm
2
) no
more than within 180 s (3 min).
d) Press the brake pedal; in doing so, the pressure should sharply fall and then there
should be no movement of the air pressure gauge pointer, which is noticeable by eye
while the pedal is shifted.
e) Shifting and releasing the brake pedal, bleed air to the pressure to not less than 0.65
MPa (6.5 kgf/cm
2
). Then check the pressure fall; it shall not exceed 0.05 MPa (0.5
kgf/cm
2
) during (30±2) min at a free position of the pedal and (15±1) min – at the pedal
being fully shifted. If the pressure falls to a greater extent, find visually the air leakage
point and eliminate the fault. If the air pressure regulation limits in the pneumatic system
do not conform to the specified values, i.e. are within the range of 0.65
–0.8 MPa (6.5–8.0
kgf/cm
2
), then it is necessary to perform maintenance of the pressure regulator.
Pressure regulator maintenance
Before maintenance of the pressure regulator, inspect and clean it from dust and dirt.
By means of the adjustment bolt, adjust pressure for compressor activation into operation for air
discharge into the pneumatic system, which shall be 0.65 MPa (6.5 kgf/cm
2
), and the pressure
for compressor disconnection from the pneumatic system, which shall be 0.8 MPa (8.0 kgf/cm
2
).
The adjustment shall be performed by bolt 7 (Fig.37) with locking nut 8 located in the upper part
of the regulator. In case of decreased air pressure, the adjustment bolt should be screwed in, in
case of increased air pressure
– it should be backed off. If one cannot manage to correctly
adjust the pressure limits, then it is necessary to dismantle the regulator for repair. It is
recommended to clean and wash the pressure regulator filter periodically, once in every two
months. It is especially important if case when oil gets into condensate due to a compressor
fault.