MTZ 1220.1/1220.3
Section D. Construction and Operation
D29
Pneumatic equipment
Single-line pneumatic drive of trailer brakes
The tractors can be equipped with the single-line and double-line pneumatic drive of
the trailers brakes, fitted up with the brakes pneumatic drive.
The pneumatic drive is used for tyre and other goals, where the energy of com-
pressed air is required.
Fig. D-21.4. Double-line pneumatic actuator of the trailer brakes
1 – compressor; 2 – pressure regulator; 3 – air bleeder valve; 4 – air bottle; 5 – emergence pressure indica-
tor light; 6 – pressure indicator; 7 – pressure sensor; 8 – emergence pressure sensor; 9 – condensate drain
cock; 10– coupling heads; 11 – control duct; 12 – brake valve.
Air intake into the pneumatic drive
is made through the engine inlet duct. Air
is compressed in the compressor (1) and,
then, fed to the air bottle (4) via a pres-
sure regulator (2). The latter helps to
maintain the required pressure in the bot-
tle. Compressed air is supplied from the
air bottle to the brake valve (13) and into
the feed duct (12) with a coupling head (a
red lid) which is permanently under pres-
sure. The brake valve (13) is connected
with the coupling head (10a) (with yellow
lid) through the control duct (11). There is
no pressure in this head.
The trailers’ and farm machinery
brakes are controlled in two modes: direct
and automatic.
In case of use of the trailer with
double-line pneumatic actuator, the cou-
pling heads of the trailer are connected to
those (10) (with a red lid) and (10
а
) (with
a yellow lid), i.e. to the feed duct (12) and
to the control duct (11). Here compressed
air is fed continuously to the trailer
Summary of Contents for 1220.1
Page 1: ...MTZ 1220 1 1220 3 1220 1 0000010 OM OPERATOR S MANUAL 2010...
Page 161: ...MTZ 1220 1 1220 3 Section I Coupling of implements I15...
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