Minsk Tractor Works Belarus 1221.2, Disassembly-Assembly Manual

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Disassembly-assembly manual for tractor BELARUS-1221.2/1221 В .2/1221.3/1221.4
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4.3.5 Reduction gear section of clutch coupling body
Drive shaft 6 (Figure 4.21) of stand-alone PTO, mounted on two bearings 3 and 5, has two gear
rings. Smaller gear ring is permanently engaged with gear 2 of pump drive for hydraulic hinge
system, and gear 14 of the first stage of PTO reduction gear; another gear ring is permanently
engaged with gear 11 of the second stage of PTO reduction gear and gear 16 for driving
transmission hydraulic system pump. Gears 11 and 14 are installed on shaft 10 and connected to it
by means of tooth clutch.
1 – arm; 2 – driving gear of hydraulic system pump; 3, 4, 5 – bearings; 6 – driving shaft; 7 –
bushing; 8 – power shaft; 9 – tooth clutch; 10 – driven shaft of PTO drive; 11 – gear of stage II of
PTO drive; 12 – roller; 13 – yoke; 14 - gear of stage I of PTO drive; 15, 16, 17 – driving gears of
transmission hydraulic system.
Figure 4.21
The pump of transmission hydraulic system is driven by drive shaft 6 (Figure 4.21) via gears 16
and 17 to gear of drive 15 actuation.
Stages I or II of PTO reduction gear are actuated by turning roller 12 with yoke 13, which puts
tooth clutch 9 to position of interlock of gears 11 or 14.
Upon clutch couple engagement torque from clutch couple driven disks is transferred to primary
shaft of gear box via shaft 8, bushing 7.