Great Plains NTA3007HD Operator Manual - Manual (Page 116)

112 NTA907HD or NTA3007HD
166-207M 04/04/2011
Hydraulic Maintenance
To function properly, the systems must be free of con-
taminants, free of air and fully charged with oil.
Hydraulic Maintenance Safety Information
High Pressure Fluid Hazard:
Do not loosen (“crack”) fittings with circuit engaged. With cir-
cuit in Neutral or Float, crack hydraulic lines carefully. There
may still be pressure in lines even with the circuit in Float or
Neutral. Wear gloves and eye protection. Crack fittings slowly.
Supply fluid slowly. When circuit is energized, watch for fluid
emergence at a safe distance.
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, seek immediate
medical attention from a physician familiar with this type of
injury.
Two or More Persons Required:
Bleeding is not a single-person operation. Establish a signal-
ling protocol between the tractor cab operator and the
observer at the bleed points. Establish an emergency stop sig-
nal. Determine the safest stop mode for each bleed. Where
components cannot move down suddenly, setting the circuit to
Float can relieve pressure in lines (depending on valve set-
tings). Where components represent a crush or shear hazard,
set circuit to Neutral.
Bleeding Hydraulics
If hydraulics have not been bled, they will operate with
jerky, uneven motions and could cause wings, openers
and markers to drop rapidly during unhook, tilt, fold or
lower. If hydraulics were not bled during initial implement
setup or if you replace a part in hydraulic system during
the life of the drill, complete the bleeding procedures in
the next few pages.
See also “Marker Hydraulic Bleeding” on page 131.
The fan/auger circuit does not require bleeding.
Check hydraulic fluid level in tractor reservoir and fill to
proper level. Add fluid to system as needed.
Note: System capacity for entire drill is about
38 liters (10 U.S. gallons).
Bleed only at:
JIC (Joint Industry Conference, 37 ° flare) or
NPT (National Pipe Thread, tapered thread) fittings.
Avoid bleeding at:
ORB (O-Ring Boss) fittings.
Never bleed at:
QD (Quick Disconnect coupler) fittings.