Great Plains Manufacturing, Inc.
Maintenance and Lubrication
69
2019-03-12
195-068M
Bleeding Hydraulics
To function properly, the hydraulics must be free of air. If
hydraulics have not been bled, they will operate with
jerky, uneven motions and could cause wings to drop
rapidly during folding or unfolding. 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 following procedures.
High Pressure Fluid Hazard:
Escaping fluid under pressure can penetrate the skin causing
serious injury. Avoid the hazard. Relieve pressure before dis-
connecting hydraulic lines. Use a piece of paper or cardboard,
NOT BODY PARTS, to check for suspected leaks. Wear protec-
tive gloves and safety glasses or goggles when working with
hydraulic systems. If an accident occurs, seek immediate med-
ical attention from a physician familiar with this type of injury.
Crushing Hazard:
Raising openers on unfolded, unhitched drill will cause drill
tongue to rise suddenly, which could cause serious injury or
death. Be certain that drill is hitched securely to your tractor
drawbar and the safety chain is securely attached to tractor
before raising openers and unfolding drill.
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 coupler) fittings.
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
4
1
2
U.S. gallons
(17 liters).Bleeding Fold Hydraulics
Over-Torque Leak Risk:
JIC fittings do not require high torque. Excess torque causes
leaks. JIC and O-ring fittings do not require sealant.
System Contamination Risk:
Always use liquid pipe sealant when adding or replacing
(NPT) pipe-thread fittings. To avoid cracking hydraulic fit-
tings from over tightening, and to keep tape fragments from
clogging filters, do not use plastic sealant tape.
