Landoll 7450 VT Plus - Manual (Page 55)

OPERATION AND MAINTENANCE
4-3
Attaching to the Tractor
1. Align the tractor drawbar with the machine. Raise or
lower the disc ring hitch, as needed, using the swivel
jack. Attach the unit with proper size hitch pin.
2. Always place the swivel jack on the interior mount
before setting the machine in motion.
3. Clean all hydraulic couplings and attach to the
tractor.
Hydraulic Lift System
The VT Plus is equipped with a rephasing hydraulic lift
system to raise and lower the unit in the field.
Figure 4-2: Hydraulic Leak Detection

WARNING
1. The rephasing hydraulic lift system contains smaller
wing frame cylinders plumbed in series with larger
center frame cylinders. It is important that the
cylinders be connected in the proper series for the lift
system to operate correctly. When the cylinders are
fully extended and held in this position, oil is able to
flow through the cylinders (or rephase) and allow the
cylinders to operate in sync. This also allows the
system to purge any air that may enter the system
without having to loosen or crack hydraulic lines.
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Escaping hydraulic fluid can cause serious
personnel injury. Relieve system pressure before
repairing, adjusting, or disconnecting. Wear
proper hand and eye protection when searching
for leaks. Use cardboard instead of hands (See
Figure 4-2.) Keep all components (cylinders,
hoses, fittings, etc.) in good repair.