Bleeding hydraulics – Great Plains 3S-4000HDF Operator Manual User Manual
Page 79
Great Plains Manufacturing, Inc.
Maintenance and Lubrication
75
2013-06-13
195-067M
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:
Check all hydraulic lines and fittings before applying pressure.
Use paper or cardboard, not body parts, and wear heavy
gloves to check for suspected leaks. Escaping fluid under
pressure can have sufficient pressure to penetrate the skin.
Fluid escaping from a very small hole can be almost invisible.
If injured, seek immediate medical attention from a physician
familiar with this type of injury.
Negative Tongue Weight Hazard:
Be certain that drill is hitched securely to your tractor draw
bar and the safety chain is securely attached to tractor before
raising openers and unfolding drill. Raising openers on
unfolded, unhitched drill will cause drill tongue to rise
suddenly, which could cause serious injury or death.
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).