Great Plains PT1230 AA1062 Operator Manual - Manual (Page 43)

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Section 6 Troubleshooting
PT1230 Pull-Type Folding Planter 401-069M-A 10/10/12
Great Plains Mfg., Inc.
Consistent shearing of drill shaft cotter
pin. Drill shaft not aligned properly. Loosen bearing and align shaft.
Drive wheel chain consistently falls off. Chain may be too long. Remove offset link.
Chain links stiff. Oil or replace chain.
Chain dislodged by trash. Add trash guards.
Markers not alternating. Marker hoses not connected to marker valve cor-
rectly. ---
Air in marker valve. Bleed marker hydraulic system.
Marker valve defective. Replace valve. See your Great Plains dealer.
Marker floats off ground. Air in hydraulic system. Bleed marker lift cylinder.
Alternator valve defective. Replace valve. (See your Great Plains dealer.)
Leaking tractor SCV. ---
Hydraulic marker functioning improperly. Check all hose fittings and connections for air and
oil leaks.
Check tractor hydraulic oil level.
Check all bolts and fasteners.
If markers do not alternate:
a. Check tractor flow controls and set to
maximum oil flow.
If problem still exists:
b. Remove Valve, disassemble, and check
for contamination or damage to spool.
Re-assemble.
Blade does not mark. The maximum marker down float is limited by the
slot in the pivot link. If the blade does not drop down
to follow depressions in the field, make sure the
marker cylinder is fully extended.
The blade may be reversed to pull dirt in or throw
dirt out depending on soil conditions.
For the following, refer to Figure 6-2.
Wings do not fold evenly. Large differential in wing weights Keep add-on items and hopper fill even
O-ring leaking in cylinder if uneven unfolding replace O-ring.
Contamination in combiner spool orifice of slower
wing remove contamination from spool.
Does not fold or unfold. Selector valve handle not fully shifted Shift selector valve
Selector valve handle bent Replace handle
Tractor hydraulic pressure below 1900 psi Increase to 1900 psi if allowed by tractor manufac-
turer, or do not fold loaded.
Problem Possible Cause Solution