MTZ 1220.1/1220.3
Section D. Construction and Operation
D18
The high-to-low reduction gear stage
switch-over mechanism of the trans-
mission
gearbox
(Fig.
E-15.5)
is
mounted on the gear-shift mechanism
cover and consists of a cylinder (11) fixed
on the axle (12), pusher (7) and lever (5)
mounted on the roller (4). The fork (16) is
connected with the lever (5) by means of
the pin (6). The lever of the roller (4)
meshes with the dog of the fork (18) (Fig.
E-15.1) and forces the synchronizer (26)
coupling to move as the roller rotates.
The position of lever (5) is adjusted by
changing the length of the pusher (7) with
further locking by a check-nut (8). The
cylinder (11) communicates with the hy-
draulic system through an electro-
hydraulic valve (14). The sensor (15)
connects the valve (14) to the electric cir-
cuit when the gear-shift lever is in its neu-
tral position, only. The drawn-in position
of the cylinder corresponds to the lower
“L” stage of the transmission gearbox re-
duction gear. Pressure-sensitive pick-ups
(10) serve to indicate the engaged state
of the reduction gear.
Fig. D-15.5. High-to-low reduction gear stage switch-over mechanism:
1 – gear-shift fork; 2 – speed range change-over fork; 3 – bolt; 4 – roller; 5 – lever; 6 – pin; 7 – pusher; 8 –
check-nut; 9, 13 – oil pipelines; 10 – pressure-sensitive pick-up; 11 – hydraulic cylinder; 12 – axle; 14 – elec-
tro-hydraulic valve; 15 – sensor, 16 – fork, 17 – bracket, 18 – adjusting screw.
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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