80-0000010B OM
111
On the 2
nd
stage of the range speed reduction unit rotation from intermediate shaft
32 to secondary shaft 6 transmits with deceleration lower, than on the 1
st
stage.
There is no neutral position of drive gear of the 1
st
stage of speed reduction unit 24
in the range speed reduction unit of the GB, for this reason 1
st
or 2
nd
stage is always en-
gaged in the range speed reduction unit.
To engage 1
st
or 2
nd
gear of the forward or reverse movement the operator shifts
GB control lever 9 (figure 3.3.2) in right most position – position of the step-down gears
and reverse movement gears. Further to engage the 1
st
or the 2
nd
forward movement gear
the operator shifts GB control lever 9 forward. In this case gear lever 4, acting on the slider
of the fork of the 1
st
gear and reverse movement transmission, shifts fork 20 backwards.
Sliding gear of the 1
st
gear and reverse movement 26 controlled by fork 20 engages with
driven gear of the 4
th
and the 7
th
gears 27 (figure 3.3.1), and power flow in the GB trans-
mits to GB intermediate shaft 32 through gears 5, 25, 25 (figure 3.3.2), 26 and 27 (figure
3.3.1).
To engage the 1
st
and 2
nd
gears of reverse movement the operator shifts GB control
lever 9 (figure 3.3.2) in position of step-down gears and reverse movement gears back-
wards. In this case gear lever 4 (figure 3.3.2), acting on slider of the fork of the 1
st
gear and
reverse movement gear, shifts fork 20 forward. Sliding gear of the 1
st
gear and of reverse
movement 26 controlled by fork 20 engages with intermediate gear of reverse movement
15, which is in constant mesh with smaller gear ring of double-crown gear of the 5
th
and
8
th
gear 28 (figure 3.3.1). On reverse movement power flow in GB transmits to GB inter-
mediate shaft 32 through gears 5, 25, 25 (figure 3.3.2), 26, 15 and 28 (figure 3.3.1).
To engage 3
rd
and 6
th
or 9
th
gears the operator shifts GB control lever 9 (figure
3.3.2) in position of these gears. Further to engage the 3
rd
(6
th
) gear the operator shifts GB
control lever 9 in the position of the indicated gears backwards. In this case gear lever 4,
acting on the slider of the fork of the 3
rd
and 6
th
gears, shifts fork 21 forward. Sliding gear
of the 3
rd
and 6
th
gears 5 (figure 3.3.1), which is controlled by fork 21, engages with driven
gear of the 3
rd
and 6
th
gears 26. By means of the formed engagement power flow transmits
to GB intermediate shaft 32.
To engage the 9
th
(direct) gear the operator shifts GB control lever (figure 3.3.2)
from the position of the 3
rd
(6
th
) and 9
th
gears forward. In this case gear lever 4, acting of
the slider of the fork of the 3
rd
and 6
th
gears, shifts fork 21 backwards. Sliding gear of the
3
rd
and 6
th
gears 5, which is controlled by fork 21, engages with inner gear ring of second-
ary shaft 6, grippingly engaging primary 34a and secondary 6 shafts. On the 9
th
(direct)
gear power flow passes the GB without transformation.
Engagement of the 9
th
(direct) gear should be carried out with the 2
nd
stage of the
speed reduction unit engaged. This will allow to avoid the increased level of noise in the
GB, as on the 2
nd
stage of the speed reduction unit the frequency of the shaft 32 idle rota-
tion is lower, than on the 1
st
stage.
To engage the 4
th
(7
th
) or 5
th
(8
th
) gears the operator shifts GB control lever 9 (figure
3.3.2) in the position of these gears. Further to engage the 4
th
and 7
th
gears the operator
shifts GB control lever 9 in the positions of the indicated gears forward. In this case gear
lever 4, acting on the slider of the fork of the 4
th
and 5
th
gears, shifts fork 12 and drive
gears block of the 4
th
and 5
th
gears 1 (figure 3.3.1), which is controlled by it, backwards.
Smaller gear ring of block 1 meshes with driven gear of the 4
th
and 7
th
gears 27. By means
of the formed engagement power flow transmits from primary shaft 34a on GB intermedi-
ate shaft 32.
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