892-0000010B OM
160
wheels steering control.
The turning angle of the wheel gear groups is limited by the length of the hydraulic
cylinder rod.
Half axle teethed crowns 16 (Figure 3.16.3) and vertical shaft 30, are made in one
piece with spline drives, form upper bevel gear and pinion.
Half axle and vertical shaft connect with their spline drives to half axle gear of differen-
tial 1 (Figure 3.16.2) and driven gear of the lower bevel gear and pinion 38 (Figure 3.16.3).
Half axle is mounted on two tapered roller bearing 18 in the body of the upper bevel gear and
pinion 17, vertical shaft ā in the boring of tube pivot 26 and rests on bearings 18. The half axle
is fixed with screw 46 and is locked with nut 47, vertical shaft is locked with two screws 14.
Preload in the bearings is adjusted by selection of adjusting rings 19 and is clamped with nut
20. To prevent unscrewing nut collar is center punched in the half axle and vertical shaft
grooves. Pivot tube flange 12 goes with it seating area into the boring of upper bevel gear and
pinion housing 17 and together with seal housing 28 is secured to it by bolts.
Adjustment of the upper bevel gear and pinion meshing is ensured by shims 25,
mounted between pivot tube flange 12 and upper bevel gear and pinion body 17.
The upper bevel gear and pinion cavity is sealed with gaskets 21, 29 and ring 13
and shims over the sealing surface of cover 15.
Bodies of the upper bevel gears and pinions 17 are installed moveably in the borings of FDA
covers 2 (Figure 3.16.1), which makes it possible to change the gauge of the front axle by
rotation of worm 30. Each body is locked against movement by two wedges 31 and pin 28.
Pivot tube 26 (Figure 3.16.3), resting on coiled cylindrical spring of suspension 33,
goes into pivot bush 31, pressed into wheel gear group housing 37 and locked in it by pin 32.
Lower end of spring rests on washer 34 and thrust bearing 35, mounted in wheel gear group
housing 37, which provides spring suspension of the front axle. The suspension movement is
limited by washer 34 when pivot tube 26 moves downwards, when the pivot tube moves up-
wards together with seal housing 28 ā by thrust collars on the seal housing and bush 31. Pivot
connection is sealed with two rings 11.
Lower bevel gear and pinion consists of drive gear 38 (mounted on two roller bearings
36, 39 in wheel gear group housing 37, closed by cover 40) and driven gear 41,mounted on
flange splines 2, to which front wheel disc is secured by bolts and nuts 1.
Wheel disc flange 2 rotates on roller bearing 43, mounted in the boring of wheel gear
group housing 37 and on two tapered roller bearings 3, pressed into cover 8. Preload in bear-
ings 11 is adjusted by selection of adjusting rings 7.
Bearings and gear 41 are locked against axial movement by washer 42 and two bolts,
fastened by bending plate.
Adjustment of lower bevel gear and pinion meshing is provided by shims 9, mounted
between cover 8 and wheel gear group housing 37. Filling of oil in the wheel gear group
housing is carried out up to the lower edge of the filler hole, in which plug 33 is installed (Figure
3.16.1), and drain is carried out by unscrewing drain plug 32.
Sealing of the lower bevel gear and pinion is carried out by gasket 4 (Figure 3.16.3),
ring 10 and shims over the sealing planes of wheel gear group 37 with cover 40 and gasket
body 5. To prevent dirt entry to working edges of gasket 4 dirt trap 6 is installed.
Brackets of front wheel fenders and brackets of steering trapezium 34 (Figure 3.16.1)
are attached to the wheel gear group housing.
Transmission of torque from differential axle shaft gear 1 (Figure 3.16.2) to wheel disc
flange 2 (Figure 3.16.3) with wheel attached to it is carried out by means of gears of the upper
and lower gears and pinions.
When turning the tractor force from the steering trapezium through steering rods and
swivel arms 34 (Figure 3.16.1) is transmitted to the wheel gear groups housings, which turn
together with wheels relative to pivots tubes 26 (Figure 3.16.3), in this case rolling of gears of
the upper and lower gear and pinion occurs.
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