Great Plains NTA1300 Predelivery Manual - Manual (Page 26)

24 NTA 1000 and NTA 1300 148-528Q 7/29/2004
Great Plains Mfg., Inc.
Bleeding Hydraulic Systems
!
WARNING!
Escaping fluid under pressure can have sufficient pressure to
penetrate the skin. Check all hydraulic lines and fittings before
applying pressure. Fluid escaping from a very small hole can be
almost invisible. Use paper or cardboard, not body parts, and
wear heavy gloves to check for suspected leaks. If injured, seek
medical assistance from a doctor that is familiar with this type
of injury. Foreign fluids in the tissue must be surgically removed
within a few hours or gangrene will result.
For safe and smooth operation, the hydraulic systems
must be free of air. The hydraulic systems should be bled
during initial implement set-up. If they were not bled, or if
you replace a hydraulic component during the life to the
drill, bleed the hydraulics.
Bleeding Lift Hydraulics
The lift system is equipped with rephasing hydraulic cylin-
ders that require a special procedure for bleeding air from
the system. Read and follow the procedure carefully.
1. Check hydraulic fluid level in tractor reservoir and fill to
proper level. Add fluid to system as needed while cy-
cling new cylinders. LIft hydraulic capacity is 23 liters
(6.1 gallons).
2. Lower drill to ground.
3. Unpin rod ends of wheel cylinders. Pivot cylinders up
and wire or otherwise safely support rod ends higher
than base ends. You may need to remove the trans-
port wheel cylinders from the mainframe so you can
orient them with rod ends higher than base ends.
4. With the tractor engine at idle speed, energize the lift
hydraulics. When the cylinders have extended com-
pletely, hold the remote lever on for one minute. Check
all hydraulic hoses, cylinders and fittings for leaks.
5. Retract the cylinder rods. Extend the rods again and
hold the remote lever on for one more minute. Repeat
this step two more times.
6. Again, check all hydraulic hoses, cylinders and fittings
for leaks. Recheck the tractor hydraulic reservoir. Fill
to the proper level.
7. Repin all cylinders
Set-Up