BELARUS-1221.2/1221
В
.2/1221.3 Description and operation
87
Fig. E-12.2. Shaft of downshift gears:
1 – primary shaft; 2, 4, 7, 8 – gears; 3 – coupling; 5, 9, 10 – bushings; 6 – retaining ring
The speed-gear assembly consists of a
primary shaft (1) (Fig. E-12.1) in assem-
bly with free needle bearing-mounted
gears. The male splines carry two splined
bushings (2) with inertia-type cone syn-
chronizers (3) mounted thereon.
The driven gears (27,28,29,30) are fitted
on the intermediate shaft (31) with slight
interference.
The gears (22) and (25) are fitted on the
gear-cluster shaft (24). The rear shaft
bearing is located in the gear (23) boss of
the synchronous PTO and FDA drive.
The secondary gear-shaft (18) is installed
in the GB housing on the tapered roller
bearings (10) and (17). The FDA driving
gear (15) is fitted immovably on the shaft.
The boss of this gear houses a driven
gear (14) on needle bearings. The bush-
ing (20) carries a driven gear (11) on its
boss. The half-coupling (12) is mounted
between the gears (11) and (14) on the
shaft (18) splines. The entire set of parts
on the shaft (18) is tightened up by the
nut (19).
The gear (4) of the 1
st
and 2
nd
ranges and
the gear (2) of the reverse are fitted on
the shaft of downshift gears and reverse
(1) (Fig. E-12.2). The gear (8) is mounted
on the shaft by means of a bronze bush-
ing. Depending on the standard equip-
ment of the gearbox, the design of the
shaft of downshift gears differs as follows:
1) if the gearbox provides for the
possibility of installation of the
speed-reduction gear, the
splined bushing (5) is fitted with
the speed-reduction gear wheel
(7) connected with the splines of
the gear (8) and fixed by means
of the retaining ring (6) on the
bushing (5);
2) if the gearbox does not provide
for the possibility of installation of
the speed-reduction gear, the
splined bushing (9) is fitted with
the bushing (10) connected with
the gear (8) through the splines
and fixed by means of the retain-
ing ring (6) on the bushing (9).
Summary of Contents for 1221.2
Page 1: ...BELARUS 1221 2 1221В 2 1221 3 1221 0000010РЭ OPERATORS MANUAL 2009 ...
Page 290: ...BELARUS 1221 2 1221В 2 1221 3 Supplement 293 Electrical scheme of tractor connections ...
Page 291: ...BELARUS 1221 2 1221В 2 1221 3 Supplement 294 Variants of tractor connections ...
Page 293: ...BELARUS 1221 2 1221В 2 1221 3 Supplement 290 826 3805010 instrument board scheme ...