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2. Preparation
2.4 Bleeding Air from the Hydraulic Fold 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 familiar 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 position.
IMPORTANT: Do not fold or unfold the fold system before bleeding air from the fold system.
To bleed the air from the hydraulic fold 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 fold system is 24 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. 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.
NOTE: Restrictors are installed in the fold cylinders to prevent falling of the wings. Never remove the restrictors, or
the machine will not fold properly.
2. Connect the fold system hoses to the tractor.
3. Make sure the tractor reservoir is full of hydraulic oil required by the manufacturer.
IMPORTANT: Do not loosen any hydraulic fittings to bleed air from the system.
4. Remove the pins from the rod ends of the fold cylinders.
5. Make sure the rod ends of the fold cylinders will not come in contact with any obstructions. If a blockage is pres-
ent, lift the rod ends of the fold cylinders.
6. Us the remote leveler in the tractor to fully extend and retract the fold cylinders. Extend and retract multiple times.
7. If the field cylinders are not operating together, cycle the fold cylinders to remove the remaining air.
IMPORTANT: Do not loosen any hydraulic fittings to bleed air from the system.
8. Stop the engine, apply the park brake, take the key with you.
9. Check the tractor hydraulic oil reservoir to make sure the hydraulic oil reservoir is still within operating limits.
10.Connect the rod ends of the fold cylinders to the machine.
11. Find an area large enough for the machine when unfolded.
12. With the tractor at a low idle, slowly engage the hydraulics to fold and unfold the machine.
13. Fully extend the fold cylinders to let the wings flex freely.
Precision Shank Drill
Operators Manual - 74356-02
26
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