Great Plains NTA2007HD Operator Manual - Manual (Page 117)

Great Plains Manufacturing, Inc. Contents Index Maintenance and Lubrication 113
04/04/2011 Contents Index 166-283M
Contact Drive Re-setting
Refer to Figure 98 and Figure 99
There is one contract drive tension spring
on the sin-
gle contact drive. The contact drive tire is held in con-
tact with the main transport tire by the tension of the
spring. A linear actuator , under control of the seed
monitor, raises the arm and tire out of contact as com-
manded by the implement lift switch.
If there seems to be:
• insufficient traction between the contact drive tire
and the main transport tire , or
• excess spring force at contact tire,
check tire sizes and inflation (page 147). Use tire sizes
specified by Great Plains, at recommended pressures.
Do not attempt to compensate for worn, under-inflated or
incorrect tires by adjusting spring tension.
Null4:
If any spring assembly components are replaced, the
factory settings for spring assembly length are:
Null4:
Figure 98
Contact Drive Spring
31182
2
3
1
4
1
2
3
4
2
3
10.0 cm (3
15 ⁄
16
in)
cup position: measured from the center-line of the
rear clevis pin to the base of the spring cup
43.8cm (17
1 ⁄
4
in)
overall length: measured between pin centers
Null4:
Figure 99
Contact Drive Spring
31183
5
6
5
6