KIROVETS K-744R1, K-744R2, K-744R3, K-744R4 tractors
159
To remove condensate, move aside plug stem at the lower part of the cylinder.
In winter it is necessary to see for condensate absence with special attention in order to
avoid its freezing in the drive tubes.
Tractor pneumatic system operation check
a) Fully release air from the pneumatic air by pressing the brake pedal several times.
b) Start the engine, set the manual fuel feed into the position of maximum crankshaft
speed and switch on the chronometer.
c) Fill air into the system to reach the maximum pressure being determined by termi-
nation of movement of the air pressure gauge pointer, which is noticeable by eye.
When in serviceable condition and with a normally adjusted pressure controller, the
compressor shall fill the system up to the pressure of 0.65-0.8 MPa (6.5-8.0 kgf/cm2)
within 180 s (3 min) max.-
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) Press and depress the brake pedal to bleed air down to the pressure of 0.65 MPa
(6.5 kgf/cm
2
) min. Then check the pressure drop; it shall not exceed 0.05 MPa (0.5
kgf/cm
2
) over (30±2) min with a free position of the pedal and over (15±1) min
– with
the pedal being fully pressed. If the pressure falls to a greater extent, visually find the
air leakage point and eliminate the fault. If the limits for air pressure adjustment in the
pneumatic system do not conform to the specified values, i.e. are not 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 controller.
Pressure controller maintenance
Before maintenance of the pressure controller, inspect and clean it from dust and dirt.
Using the adjustment bolt, adjust the compressor activation pressure for air discharge into
the pneumatic system, which shall be 0.65 MPa (6.5 kgf/cm
2
), and the pressure for compres-
sor disconnection from the pneumatic system, which shall be 0.8 MPa (8.0 kgf/cm
2
).
Bolt 7 (Fig.45) with locking nut 8 located at the upper part of the controller shall be used for
adjustment. The adjustment bolt should be screwed in with low air pressure and screwed out
- with high air pressure. If one cannot manage to correctly adjust the pressure limits, the con-
troller should be dismantled for repair. It is recommended to clean and wash the pressure
controller filter periodically, once in every two months. It is especially important in case when
oil gets into condensate due to a compressor fault.