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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5 FRONT DRIVING AXLE (FDA)
5.1 Drive of front driving axle
FDA drive is designed for transfer of torque from gear box to FDA. It includes reduction gear with
multi-disk friction hydraulically driven clutch, torsion, cardan shaft and drive control system. Drive
friction clutch is located inside GB body on the right side of tractor movement.
1 - gear; 2 – stack of friction disks; 3 - drum; 4 - shell; 5 - shaft; 6 – half-clutch; 7 - spring; 8 -
bushing; 9 - torsion; 10 - yoke; 11 - pusher; 12 - switch; 13 - piston; 14 – switch spacer (12); 15 -
guide.
Figure 5.1
Drive reduction gear consists of shaft 5 mounted inside GB body on ball bearing
ах 5. On the shaft
freely rotates (with drive disengaged) gear 1 which in permanent engagement with gear of
synchronous PTO drive, (Figure 5.1). When clutch is engaged disks 2 are squeezed by piston 13
under oil pressure and connect gear 1 with drum 3 of hydraulically pressed clutch as one unit. Drum
3 and knucle half-clutch 6 of free travel mechanism are mounted on splines of shaft 5, with splined
connection allowing the drum to turn against shaft by 45°. Half-clutch 6 is permanently squeezed to
knuckles of drum 3 by spring 7 and can axially move, affecting pusher 11 of automatic engagement
switch 12. For adjustment of switch 12 spacers 14 installed between switch 12 and guide 15 are
provided. Torsion 9 passes through clutch body and connects splined bushing 8 of shaft 5 with
sliding yoke 10 of cardan shaft.
.