MTZ 1220.1/1220.3
Section D. Construction and Operation
D28
Service brakes
The service brakes are of 8-disk type.
The friction disks (2) are installed in
splined ends of the hub drive pinions (16).
The pressure disks (6) are similar in de-
sign to those used in dry brakes, but with
a reduced angle of gradient for balls, to
ensure the required force of compression
of the packs of the friction and intermedi-
ate packs.
Attention! The pressure disks of dry and
“wet” brakes have the same physical and
fixing dimensions, but they are not inter-
changeable. It is strictly prohibited to in-
stall the disks designated for dry brakes
on “wet” brakes or vice versa. Otherwise,
the safety of tractor operation could be
substantially jeopardized.
The intermediate disks (3) are fixed from
turning in their cases (1, 13) by means of
shoulders made over the outer profile.
The leak-proofness of the oil baths is en-
sured by the O-rings (15, 24), gaskets
(10, 14) and rubber boots (5, 23). The
cases are provided with inspection (22)
and drain (12) plugs.
Parking Brake
A 4-disk parking “wet” brake (8) is in-
stalled in the same case as the multiple
disks service brake. Its components are
unified with those of the service brake.
Differential Lock “Wet” Clutch
The lock-up clutch (17) comprises six
disks with brake ceramic-metal linings fit-
ted on the splined boss (18) connected
with the hub drive pinion (16). A pack of
six friction and five intermediate disks is
compressed as oil under pressure is fed
to the diaphragm space. The frictional
torque developed thereby ensures inter-
locking of the rear axle differential. The
clutch is made in a single case with the
service brake. It shares a common oil
bath with the brake and is sealed by
means of the cover (20) and special cor-
rugated boot (23) slipped over the adap-
tor (21) which delivers oil to the head
space of the diaphragm.
Brake Actuators
The service and parking brake actuators
are of mechanical type and consist of the
leverage and pedals.
The actuators of service and parking
brakes of “wet” type are fundamentally
the same as those used in dry brakes on
a respective tractor model.
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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