Great Plains NTA3010 Predelivery Manual - Manual (Page 24)

22 NTA3010, NTA3510 and ADC Great Plains Manufacturing, Inc.
160-220M 11/06/2008
Charging Hydraulics
Charging Lift Hydraulics
The lift system is equipped with re-phasing hydraulic cyl-
inders that require a special procedure for oil fill (charge)
and bleeding air from the system. Read and follow the
procedure carefully. The re-phasing cylinders will not
function properly with air in the system.
23. Check the hydraulic fluid level in the tractor reservoir
and fill to the proper level. Add fluid to the system as
needed. A low reservoir level may draw air back into
the system and cause jerky or uneven cylinder
movements. During initial cycling of new hydraulic
cylinders, you will need about 8
3 ⁄
4
gallons (32 liters)
of oil to charge empty cylinders.
24. Make sure implement frame sections are supported
by jack stands or blocks.
Refer to Figure 23
25. With the frame blocked and supported, un-pin the
rod end of the wheel cylinders. Pivot the cylinders up
and wire or otherwise safely support the rod end
higher than the base end.
Note: At the rockshaft cylinders, you may need to remove
the cylinders from the frame so that they can be ori-
ented with the rod end higher than the base end.
26. Set tractor flow control to 8 to 10 gpm when charging
cylinders. This avoids aerating oil and possible seal
damage with high flow tractors.
27. With the tractor engine at idle speed, energize the lift
hydraulics. When the gauge-wheel cylinders on both
wings are extended completely, hold the remote
lever on for one minute. Check all hydraulic hoses,
cylinders and fittings for leaks.
28. Retract the cylinder rods. Extend the rods again and
hold the remote lever on for one more minute.
Repeat this step two more times to charge and bleed
the system completely. Leave the cylinders un-
pinned and the drill frame supported. Again, check
all hydraulic hoses, cylinders and fittings for leaks.
29. Recheck the tractor hydraulic reservoir. Fill to the
proper level.
30. Re-pin all cylinders, and secure pins with cotter pins.
31. Slowly extend cylinders until all rods are completely
extended.
Figure 23
Support Rod End
16238
!
WARNING
Escaping fluid under pressure can have sufficient pressure to
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
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.
!
WARNING
Before attempting to hydraulically lift the implement, hook the
implement to the cart and a tractor of adequate size and
power. Failure to do so could result in severe equipment dam-
age and bodily injury or death.