MTZ 1220.1, Operator'S Manual

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MTZ 1220.1/1220.3 Section D. Construction and Operation
D37
1 – differential casing; 2 – driving plate; 3 – driven plate; 4 – pressure cup; 5 – satellite shaft; 6 – satellite; 7 –
differential cover; 8 – axle-shaft gear; 9 - taper roller bearing.
10 – semi-axis shaft.
Fig.D-25.
Differential
Wheel reduction gears of planetary spur-gear type
Wheel reduction gears of planetary spur-gear type are intended for transmitting and increasing the
torque from the FDA differential at various angles of turning of the front steerable driving wheels.
The reduction gears are mounted in the casings (35) and connected with the axle beam by
means of spindles (3) (see Figure “FDA”) and can turn relatively to the FDA beam on the two bear-
ings (9). The spindles are connected with the wheel reduction gear casing by means of the bolts
(4). The screw (38) and locknut (37) serve for adjusting the angle of turn of the wheel reduction
gears.
The pivots (3) are lubricated through lubricators (6) mounted on the pivots. The lubricators are
protected against penetration of dirt by means of rubber caps (5). To protect the pivot bearings
from dirt, the sleeves (8) with sealing rubber rings (7) are installed in the housings of the axle
beam. The pivot bearings (9) are adjusted by means of the shims (2) located under upper spindles
(3).
The wheel reduction gear (1) consists of a doubled joint, spur-gear and planetary drives, levers
for controlling the turning of the front wheels.
The doubled universal joint (24) (see Figure “Wheel reduction gears”) is connected with the
FDA differential by means of half-axle shaft with splined ends (13) (see Figure “FDA”) from the one
side and with the driving gear (17) from the other side (see Figure “Wheel reduction gears”) of the
spur-gear drive.
The driving gear is mounted on the two taper roller bearings (18). One of them is installed in the
counterbore of the reduction gear casing (35) and another – in the carrier (22). The doubled uni-
versal joint is fixed in the pinion by means of the washer (15) and bolt (14) with a bent-out plate.
The bearings (18) are adjusted by means of the shims (21) which are placed between the car-
rier and the reduction gear casing.
The driving gear of the wheel reduction gear is in mesh with the rear block (driven gear of the
spur-gear drive) (34) the second crown of which is a sun gear or driving part of the planetary se-
ries. The driven part of the planetary series connected with the tractor wheel is the wheel flange
which is spline-connected rigidly with the cage (5) by means of three satellites (11), while the epi-
cyclic gear (12) serves as a braked gear perceiving the reactionary torque.
The epicyclic gear is mounted in the reduction gear and fixed against turning by three pins (13).
An additional gasket is placed between the cover and casing of the reduction gear. The sun gear is
mounted on the wheel flange, on the two-row taper bearing (33) which is fixed from the one side by