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Tractor fitted with a four-speed gearbox giving a 40 km/h speed, with reduction, three-stage torque multiplier, reversal, and the front driving
FORWARD SPEEDS
Speed gear
Total
transmission
ratio
H
17,920
4 Hi
M
20,719
L
23,985
H
25,653
3 Hi
M
29,661
L
34,336
H
38,859
2 Hi
M
44,930
L
52,012
H
59,989
1 Hi
M
69,360
L
80,293
H
74,089
4 Lo
M
85,663
L
99,166
H
106,063
3 Lo
M
122,631
L
141,961
H
160,663
2 Lo
M
185,760
L
215,041
H
248,023
1 Lo
M
286,768
L
331,969
MAIN TECHNICAL PARAMETERS
SPEEDS OF THE Z 8641 - Z 11441 FORTERRA TRACTORS (40 km/h)
axle (24 forward speed gear and 18 reverse speed gears)
Tractor travel speed at rated
revolutions
16,9-38
18,4-38
(795 mm)
(820 mm)
36,8
37,9
31,8
32,8
27,5
28,3
25,7
26,5
22,2
22,9
19,2
19,8
17,0
17,5
14,7
15,1
12,7
13,1
11,0
11,3
9,50
9,80
8,21
8,47
8,90
9,18
7,70
7,94
6,65
6,86
6,22
6,41
5,38
5,54
4,64
4,79
4,10
4,23
3,55
3,66
3,07
3,16
2,66
2,74
2,30
2,37
1,99
2,05
REVERSE SPEEDS
Speed gear
Total
transmission
ratio
H
22,187
3 Hi
M
25,653
L
29,696
H
33,608
2 Hi
M
38,858
L
44,983
H
51,883
1 Hi
M
59,987
L
69,443
H
91,730
3 Lo
M
106,059
L
122,777
H
138,952
2 Lo
M
160,658
L
185,981
H
214,506
1 Lo
M
248,015
L
287,109
The forth speed gear is impossible to engage!
Wheels
16,9-38
18,4-38
14,9-24
239
Tractor travel speed at rated
revolutions
16,9-38
18,4-38
(795 mm)
(820 mm)
29,7
30,6
25,7
26,5
22,2
22,9
19,6
20,2
17,0
17,5
14,7
15,1
12,7
13,1
11,0
11,3
9,49
9,79
7,19
7,41
6,22
6,41
5,37
5,54
4,74
4,89
4,10
4,23
3,54
3,66
3,07
3,17
2,66
2,74
2,30
2,37
Equivalent
16,9 R 38; 480/70 R 38
18,4 R 38; 520/70 R 38
14,9 R 24; 420/70 R 24
12,4 R 28; 360/70 R 28
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