Great Plains YP1625A Operator Manual - Manual (Page 43)

Great Plains Manufacturing, Inc. Table of Contents Index Operating Instructions 39
2013-08-13 Table of Contents Index 401-625M
Hydraulic Drive Operation (Option)
Refer to Figure 49
The hydraulic drive option replaces the standard contact
wheel ground drive with a hydraulic motor
, as the
power source for meter rotation.
The drive requires a separate closed center hydraulic
circuit capable of 4.5 gpm (17 lpm). A check valve
at
the motor prevents reverse operation, should the
connections be reversed at the tractor, or the circuit lever
reversed.
When the hydraulic circuit is active, a solenoid valve
controls flow to the motor, as the “Planter Channel” of the
seed monitor. Refer to the DICKEY-john
®
Planter Drill
Control manual, User Level 2/3.
When the planter is raised in normal field operations, the
lift switch causes the seed monitor to shut off hydraulic
flow to the motor. You can override this shutoff, and
operate the drive while raised, using special seed
monitor modes:
• In User Level 1, the “FILL DISK” operation runs the
motor for one meter disk revolution.
• In User Level 2, the “5 REV TEST” operation runs the
motor for five meter disk revolutions.
A filter in the system requires periodic maintenance.
See “Hydraulic Drive Maintenance” on page 99.
If there is no meter rotation when expected, the circuit
lever or connections may be reversed. Also check for
solenoid valve problems, such as a disconnected lead,
and any seed monitor diagnostic messages.
To T
ractor
To T
ractor
Figure 49
Hydraulic Drive
28475
3
2
1
4
1
2
3
4