Fda Differential - Belarus 80.1 Operation Manual

Filling of oil in the FDA beam is carried out up to the lower edge of filler hole through
plug 14. Oil drain from the FDA beam is carried out by means of unscrewing drain plug 15 in
the FDA body. Filling of the FDA shall be carried out on the horizontal surface. Hole for plug
14 serves for fixation of the driven gear when checking the adjustment of the main gear mesh-
ing.
Hermiticity of the main gear cavity and the FDA beam is carried out by gaskets 3, 23
and by sealing rings 5, 19 installed in covers 2 and in main gear cage 20.
To prevent oil backing before the drive gear gasket, oil thrower ring 22 is installed on its
spline end. Spiral grooves are cut along the outer diameter of the groove.
FDA body 8 is connected to the beam by two hollow axes 13, on which the axle to-
gether with wheels can swing in transverse plane, deviating for angles limited by the stops in
covers 2 during their contact with tractor beam. The axes are locked by planks 12 against axi-
al movement.

3.10.1.2 FDA differential

This differential is mounted both on tractors with FDA 72 (with bevel wheel gear
groups) and on tractors with FDA 822 (with planetary spur wheel gear groups).
Self-locking differential of increased friction. In housing 5 and cover 7 (figure 3.10.2)
of the differential connected with bolts, two pairs of planetary gears 4 on floating shafts 6,
axle shaft gears 1, pressure cups 3 and friction discs – drive 2 and driven 8 are located.
The self-locking differential automatically connects both half axles 16 (figure
3.10.3), excluding separate slipping of wheels and increasing FDA traction force. The dif-
ferential lock is activated when the front axle is engaged. In this case planetary gear shafts
6 (figure 3.10.2) turn under load and move along taper grooves in housing 5 and cover 7 of
the differential accordingly to the size of the clearance between friction discs 2, 8. From
the shafts the force is transmitted to planetary gears 4, which transmit it with collars to
cups 3, and they in turn compress friction discs against the stop to the walls of the body
and differential covers. Drive discs 2, having outer teeth, are connected to the teeth of the
body and the differential cover, and driven discs 8 (by inner teeth) – with axle shaft gears.
Friction force of the compressed discs integrates axle shaft gears and the body with the
differential cover, thus locking the differential. When turning the tractor, when the FDA is
engaged and the external forces exceed the friction forces in the friction discs, the friction
discs will slip.
The differential is mounted on two tapered roller bearings 11 (figure 3.10.1) in co-
vers 2 of the FDA beam. The differential bearings are adjusted by shims 4 (figure 3.10.1).
1 – axle shaft gear; 2 – drive discs; 3 – pressure cup; 4 – planetary gear; 5 – differential
housing; 6 – planetary gear shaft; 7 – differential cover; 8 – driven disc; 9 – adjusting shims;
10 – driven gear; 11 – drive gear.
Figure 3.10.2 – FDA differential
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80-0000010B OM