Great Plains 3N4010HDA Operator Manual - Manual (Page 65)

Great Plains Manufacturing, Inc. Table of Contents Index Maintenance and Lubrication 61
2013-09-24 Table of Contents Index 196-444M
Seed Flap Replacement
Refer to Figure 60
To replace a seed flap
use a needle nose or similar
tool and squeeze the tabs together. Pull plastic seed
flap down out of metal bracket .
Push new seed flap up through metal bracket until
tabs on seed flap snap in place.
Marker Maintenance
If grease-seal cap for marker-disk-hub bearings is dam-
aged or missing, disassemble and clean hub. Repack
with grease and install a new seal or grease cap.
Bleeding Marker Hydraulics
Bleed only at:
JIC (Joint Industry Conference, 37 ° flare) or
NPT (National Pipe Thread, tapered thread) fittings.
Never bleed at:
ORB (O-Ring Boss) or
QD (Quick Disconnect) fittings.
JIC fittings do not require high torque. JIC and O-ring fit-
tings do not require sealant. Always use liquid pipe sealant
when adding or replacing (NPT) pipe-thread fittings. To
avoid cracking hydraulic fittings from over tightening, and to
keep tape fragments from clogging filters, do not use plastic
sealant tape.
To fold properly, the marker hydraulics must be free of
air. If the markers fold in jerky, uneven motions, follow
these steps.
Crushing and Overhead Hazard:
You may be injured if hit by a folding or unfolding marker.
Markers may fall quickly and unexpectedly if the hydraulics
fail. Never allow anyone near the drill when folding or unfold-
ing the markers.
1. Check that tractor hydraulic reservoir is full. Review
“Marker Operation” on page 29.
2. With both markers lowered into field position, loosen
hydraulic-hose fittings at rod and base ends of
marker cylinders. If applicable, loosen fittings on
back side of sequence valve.
3. With tractor idling, activate tractor hydraulic valve
until oil seeps out around a loosened fitting. Tighten
that fitting.
4. Reactivate tractor hydraulic valve until oil seeps out
around another loosened fitting. Tighten that fitting.
Repeat process until all loosened fittings have been
bled and tightened.
Figure 60
Seed Tube Flap
19398
3
2
1
2
1
2
1 3
1 3
2