892-0000010B OM
95
In the neutral position of gearbox control lever 9, the extreme positions of its free
swing in the transverse plane are determined by the stop of the edges of the flat of shaft 2
against spring-loaded ball 3. These two positions of gearbox control lever 9 correspond to:
to the right from you - the position of gear lever 4 in the slide groove of the yoke of 3rd and
6th speeds 21, to the left towards you - the position of gear lever 4 in the slide groove of
yoke of 4th and 5th speeds 12 (these are, respectively, the two middle positions of gearbox
control lever 9).
To move gear lever 4 to the “pocket” position of arm of range gear unit 13, the oper-
ator needs to move gearbox control lever 9 from the neutral position to the rightmost position
from you, and to move gear lever 4 to the position of the slide of yoke of 1st speed and
reverse 20 - from the neutral position to the leftmost position towards you. In both cases,
the operator will need to apply a lateral force to compress the spring of ball 3. Having over-
come the force of the compressed spring, ball 3 will rise up, and shaft 2 with gear lever 4
will move until stops against the corresponding edge of limiting plate 14 (Figure 3.3.1), being
in the position of the corresponding slider.
Gearbox control cover 15 is equipped with sensor 13, which provides locking of the
diesel engine start-up when the gear is engaged in the gearbox.
ATTENTION: ADJUSTMENT OF SWITCH 13 (FIGURE 3.3.1) SHOULD BE CAR-
RIED OUT BY INSTALLING THE REQUIRED NUMBER OF ADJUSTING SHIMS 12. IF
ADJUSTMENT CANNOT BE DONE BY THE GASKET SET, THEN THE SWITCH SHOULD
BE REPLACED AND ADJUSTMENT TO BE DONE AGAIN!
3.3.4 Gearbox operation
The design of the 9F/2R gearbox provides 4 forward speeds and one reverse speed.
The engagement of each of them is possible in both passes of the range gear unit. There is
also one direct forward speed, whereby, when engaged, primary 34a (Figure 3.3.1) and
secondary shafts 6 are rigidly connected by drive gear of 3rd and 6th speeds 5, which acts
as a gear coupling. In direct speed, the gears of the gearbox do not take part in the trans-
formation of the power flow.
If the tractor is equipped with a reverse gear unit (Figure 3.3.3) (gearbox versions
9R/9F), then the reverse speed is not available in the gearbox. The reverse motion of the
tractor is implemented by turning on the reverse gear unit.
Engagement of speeds and ranges of the gearbox is carried out with one gearbox
control lever 9 (Figure 3.3.2) according to the diagram. The choice of the speed in the gear-
box is preceded by the selection of the required range of the gearbox.
Gears and ranges may only be shifted when the tractor is stopped.
To select and engage a range of the gear unit, the operator shall move gear shifting
lever 9 from the neutral position to the position of the range gear unit. Further, to engage
the 1st pass of the gear unit, the operator shall move gearbox control lever 9 back. In this
case, gear lever 4, acting on the arm of range gear unit 13, moves it as well as the related
shaft 11 (Figure 3.3.1) with yoke 9 forward. Drive gear of I
st
(first) pass of gear unit 24,
controlled by yoke 9, moves along the splines of intermediate shaft 32 and engages with
driven gear 6 of the I
st
pass of the range gear unit.
To engage the II
nd
(second) pass of the gear unit, the operator should move gearbox
control lever 9 (Figure 3.3.2) in the position of the range gear unit forward. In this case, lever
4, acting on the arm of range gear unit 13, moves it as well as the related shaft 11 (Figure
3.3.1) with yoke 9 back. Drive gear of 1st pass of gear unit 24, controlled by yoke 9, moves
along the splines of intermediate shaft 32 and engages with the inner toothed rim of drive
gear of II
nd
(second) pass of range gear unit 23, connecting it to intermediate shaft 32. Gear
23 is constantly engaged with driven gear of II
nd
(second) pass of range gear unit 18.
In the II
nd
pass of the range gear unit, the rotation from intermediate shaft 32 to sec-
ondary shaft 6 is transmitted with a slowdown lesser than in the I
st
pass.
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