Great Plains NTA3007 Operator Manual - Manual (Page 132)

128 NTA907 or NTA3007 Table of Contents Index Great Plains Manufacturing, Inc.
166-371M Table of Contents Index 2012-07-02
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
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
cardboard, 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
signalling protocol between the tractor cab operator and the
observer at the bleed points. Establish an emergency stop
signal. 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
settings). Where components represent a crush or shear
hazard, set circuit to Neutral.
Bleeding Hydraulics
If hydraulics have not been bled, systems may operate
with jerky, uneven motions. Openers and markers could
drop rapidly during unfold. 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 “Brake Line Charge and Bleed” on page 135
and “Marker Hydraulic Bleeding” on page 133.
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 litres (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.