MTZ 1220.3 - Page 73

MTZ 1220.1/1220.3 Section D. Construction and Operation
D25
Service Brakes (MTZ-1221.2/1221.3)
The tractor is equipped with three-disk
dry brakes of an increased standard size.
The disks of the left- and right-hand
brakes (2) (Fig. E-20) are spline-mounted
on the rear axle hub drive pinions. The
brakes consist of housings (1), friction
disks (2), pressure disks (4), balls (5) and
contraction springs (6).
The brake actuator is of mechanical type.
Each brake is activated by a separate
pedal (23).
To brake both wheels at the same time,
interlock of the pedals with a latch strip
(24). When the right-hand brake pedal is
depressed, the stop-signal lamps light up.
Fig. D-20. Service brakes and their controls (exploded view):
1 – housing; 2 – brake disk; 3 – intermediate disk; 4 – pressure disk; 5 – ball; 6 – spring; 7 – wire; 8 – nut; 9
– bolt; 10 – check nut; 11 – key-tongue; 12 – lever; 13 – pin; 14 – axle; 15 – boot; 16 – pin; 17 – fork; 18 –
tie-rod; 19 – hooks; 20 – contraction spring; 21, 22 – lever; 23 – stem with pad (pedal); 24 – latch strip; 25 –
adjusting bolt; 26 – spherical washer