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2.3 Bleeding Air from the Hydraulic Lift System
Before starting the procedure.
WARNING:
Leaking fluid under pressure can enter the skin causing serious injury. Release pressure before disconnecting hydraulic or
other lines. Tighten all connections before applying pressure. Keep hands and body away from pinholes and nozzles which
eject fluids under high pressure. Wear correct hand and eye protection when looking for leaks. Use a piece of card board or
paper instead of your hand. Any fluid injected into the skin can cause gangrene. The fluid must be removed by a doctor famil
iar with this type of injury.
WARNING:
Be careful of sweeps or blades when folded to prevent serious injury. Never keep the machine with the wings in the folded pos
tion.
To bleed the air from the hydraulic system, connect the machine to a tractor that is the correct size to operate the
machine. See the information for minimum tow vehicle weight.
Total volume of oil required to fill the lift system is 16 gallons (estimated).
Completely bleed the hydraulic system of air when:
The lift system of filled with hydraulic oil for the first time.
Air had entered the hydraulic system through a leak or through repair of the hydraulic system.
Procedure
1. Park the machine on a flat, level surface that is large enough for the machine when unfolded.
2. Set the tractor hydraulic flow to less then 20gal/min (75.7 L/min).
IMPORTANT: If the hydraulic flow is set to more then 20gal/min (75.7 L/min) the hydraulics will not operate correctly.
3. Connect the lift system hoses to the tractor.
4. Make sure the tractor reservoir is full of the hydraulic oil required by the manufacturer.
IMPORTANT: Do not loosen any hydraulic fitting to bleed air from the system.
5. Raise the machine. Continue to hold the tractor lever to let oil bypass and fill each wing lift cylinder.
6. Engage the hydraulic to remove any hydraulic transport locks if equipped.
7. Stop the engine, apply the park brake and take the key with you.
8 Remove the transport locks when all lift cylinders are fully extended.
9. Lower the unit. Make sure the cylinders move at the same time through the cycle.
10. Hold the hydraulic lever with the cylinders fully extended.
11. If the cylinders are not operating together,cycle the cylinders to remove the remaining air.
IMPORTANT: Do not loosen any hydraulic fittings to bleed air from the system.
12. Stop the engine, apply the park break, and take the key with you.
13. Check the tractor hydraulic oil reservoir to make sure the hydraulic oil is still within operating limits.
14. Make sure all lift cylinders are operating together before starting any field operation.
15. Fully raise the machine when making turns during field operation.
This will make sure that the cylinders are operating together and keep the machine level during operation.
25
2. Preparation
Precision Shank Drill
Operators Manual - 74356-02
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