Great Plains NTA2007HD Operator Manual - Manual (Page 118)

114 Great Plains Manufacturing, Inc. Contents Index NTA607/2007HD
166-283M Contents Index 04/04/2011
Hydraulic Maintenance
To function properly, the hydraulic systems must be free
of contaminants, free of air and fully charged with oil.
Hydraulic Maintenance Safety Information
High Pressure Fluid Hazard:
Do not loosen (“crack”) fittings with a circuit engaged. With a
circuit 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 fit-
tings 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 to drop
rapidly during unfold. If hydraulics were not bled during
initial implement setup or if you replace a part in hydrau-
lic system during the life of the drill, complete the bleed-
ing procedures in the next few pages.
See also “Brake Line Charge and Bleed” on page 119
and “Marker Hydraulic Bleeding” on page 130.
Check hydraulic fluid level in tractor reservoir and fill to
proper level. Add fluid to system as needed.
Note: System capacity for the entire drill is about
38 liters (10 U.S. gallons).
Fitting Damage Risk:
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.