MTZ 1220.3 - Page 180

MTZ 1220.1/1220.3 Section М. Possible failures
М12
Defect
,
external
manifestation
Way of elimination
and bot
tom cover, outlet holes in cover are
littered.
gap availability.
There
is
no
air
supply
in
c
onnecting
hose
through air takeoff valve
Rod of air takeoff valve in regulator of pres-
sure is insufficiently sunk.
Screw a nut on
the union of connecting
pipe.
Regulator of pressure switched compressor
to idle.
Reduce pressure in balloon below 0,65 MP
(6,5 kilogram-force /sm
2
).
Displacement of rubber ring on air takeoff
valve.
Turn off cover, check position and condition
of rubber ring.
Brakes of trailer are released slowly
Adjustment of brake valve and its drive is
disturbed.
Adjust. (see section “Adjustments”).
Work of trailer brake system is disturbed. Adjust.
Brakes of trailer operate ineff
i
ciently
Brake valve does not provide pressure
0,77…0,80 MP (7,7…8,0 kilogram-
force
/sm
2
) in main pipe.
Adjust brake valve and its drive (see sec
tion
“Adjustments”).
Brake valve does not provide pressure drop
to zero in connecting pipe.
Adjust brake valve and its drive (see sec
tion
“Adjustments”).
Pressure in connecting pipe slowly drops to
zero.
Check condition of connecting pipe, atmos-
pheric valve hole, brake pedal stroke.
Work of trailer brake system of is disturbed. Adjust.