Great Plains PT1230 AA1062 Operator Manual - Manual (Page 18)

16
Section 2 Planter Operation
10/10/12 PT1230 Pull-Type Folding Planter 401-069M-A
Great Plains Mfg., Inc.
Marker Hydraulics
!
DANGER!
Never allow anyone near the planter when cycling the markers.
Excessive travel speed of the markers can be dangerous and/or
damage the marker assembly.The flow controls should be prop-
erly adjusted before the marker assembly is first put into use.
Refer to Figure 2-9:
The marker hydraulic system is equipped with needle
valves to control how fast each marker operates. The nee-
dle valves are built into the sequence valve body. There
are two hex adjustment heads, one for controlling marker
speed up and one for controlling marker speed down. To
adjust the speed of each marker, loosen jam nut, screw
the needle valve clockwise to adjust the marker speed to a
low setting. Fold the marker up and down a few times and
recheck for pinching and kinking of hoses. With the tractor
engine at an operating rpm, adjust the needle valve to limit
the marker to a safe operating speed. Excessive folding
speeds can cause marker damage.
Rephasing the Hydraulic System
!
WARNING!
Escaping fluid under pressure can penetrate the skin causing
serious injury. Avoid the hazard by relieving pressure before
disconnecting hydraulic lines. Use a piece of paper or card-
board, NOT BODY PARTS, to check for suspected leaks. Wear
protective gloves and safety glasses or goggles when working
with hydraulic systems. If an accident occurs, see a doctor im-
mediately. Any fluid injected into the skin must be surgically re-
moved within a few hours or gangrene may result.
Refer to Figure 2-8:
The lift system on your Great Plains Pull-Type Planter is a
master/slave system. All cylinders in the system are 2/way
cylinders. Rephasing the system is accomplished each
time the planter is lowered to the planting position. If un-
level lifting occurs, lower the planter to the ground and hold
the remote lever momentarily. This time will allow oil to go
from the tractor to the master, bypass to the master, by-
pass to the slave, then return to the tractor.
15806
Rephasing the Hydraulic System
Figure 2-8