MTZ 1220.1, Operator'S Manual

Page: 65 / 244

MTZ 1220.1/1220.3 Section D. Construction and Operation
D17
Three dogs, a fork (8), ball-point lock (13)
and parts of the two gear engagement
lockout mechanism are installed in the
fork assembly (7). The member is at-
tached to the transmission gearbox cas-
ing (1).
The shaft (9) with the arm (15) and bush-
ing (12) fitted thereon is installed in the
supports of cover (13) and casing (6) (see
Fig. E-15.3). The two bushings (18) and
spring (10) are installed between the re-
taining rings (19). The bushing end-faces
abut the screw (17) and the casing (6)
end-face. This arrangement serves to set
the gear-shift lever to neutral. The shaft
(9) is coupled with fork (1), with the gear-
shift lever fixed thereto through the pins
(5 and 7) and lever (20). The fork (1) is
located in the casing (6), in the sphere
socket (3) and spring-loaded with the
spring (4).
The speed range change-over mecha-
nism (Fig. E-15.4) is installed in the
transmission gearbox casing (1) and
cover of the gear-shift mechanism (14)
(see Fig. E-15.1).
In the casing (1), the fork (37) for chang-
ing-over the toothed coupling (36), the
fork for changing-over the toothed cou-
pling (6) (see Fig. E-15.2) and the fork
(18) for changing-over the synchronizer
(26) (see Fig. E-15.1) are mounted on the
dogs. The dogs are locked in the body
with ball-point locks.
In the control mechanism (Fig. 15.4), the
shaft (9) together with arms (10) keyed
thereto rests in the supports of cover (12)
and housing (18). The shaft (9) is locked
with a ball-point lock (14) and is con-
nected to fork (1) with attached speed-
range change-over lever by means of
pins (5 and 7). The fork (1) is located in
the casing (18), in the sphere socket (3)
and
preloaded with spring (4).
Fig. D-15.4. Speed-range change-over mechanism:
1 – fork; 2 – boot; 3 – sphere socket; 4 – spring; 5, 7 – pins; 6, 10 – levers; 8 – covers; 9 – shaft; 11 – link;
13, 17 – keys; 14 – ball-point lock; 15 – nut; 16 – bolt; 18 – casing.