Great Plains NTA2007 Operator Manual - Manual (Page 122)

118 NTA607 or NTA2007 Table of Contents Index Great Plains Manufacturing, Inc.
166-372M Table of Contents Index 2012-01-05
Contact Drive Re-Setting
Refer to Figure 97 and Figure 98
There is one contract drive tension spring
on the
single contact drive. The contact drive tire is held in
contact 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
commanded 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 152). 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.
If any spring assembly components are replaced, the
factory settings for spring assembly length are:
Figure 97
Contact Drive Spring
31182
2
3
1
4
1
2
3
4
2
3
100 mm (3
15 ⁄
16
in)
cup position: measured from the centre-line of the
rear clevis pin to the base of the spring cup
438 mm (17
1 ⁄
4
in)
overall length: measured between pin centres
Figure 98
Contact Drive Spring
31183
5
6
5
6