OPERATION AND MAINTENANCE
4-5
Hydraulic Fold System
1.
The VT Plus is equipped with a hydraulic fold system
to raise and lower the wing frames for narrow
transport.
2.
Be sure the system is fully charged with hydraulic oil
before attempting to fold/unfold the unit. Air in the
system can allow uncontrolled dropping of the wing
frames causing serious personal injury or machine
damage. The system needs to be charged with oil
initially and any time the system has been opened for
repair such as cylinder, hose, or fitting
replacement/repair.
Figure 4-5: Hydraulic Leak Detection
3.
To charge the system, carefully hitch the VT Plus to
the tractor.
Unpin the end(s) of the fold cylinders,
and position them so they can extend and retract
without contacting any frames or other parts.
Check the tractor hydraulic fluid level to make sure it
is full of the manufacturer’s recommended hydraulic
fluid. Connect the cylinder hoses to the tractor and
fully extend and retract the cylinders several times.
The cylinder rod travel should be smooth and positive
when all air has been purged from the system. Due
to large amounts of hydraulic oil required, recheck
the tractor fluid level to make sure it is within proper
operating limits.
4.
The hydraulic fold system is equipped with restrictors
in the rod end of cylinders to prevent uncontrolled
falling of wing frames when unfolding. Removal or
improper assembly of these restrictors can cause the
machine to fold improperly and result in serious
machine damage.
WARNING
5.
To fold/unfold the VT Plus, find a level area large
enough to accommodate the VT Plus when it is fully
unfolded. The tractor should be stopped and not
moving with the unit fully raised.
See “Folding the
7450 VT Plus” on page 4-6 and “Unfolding the
7450 VT Plus” on page 4-6
for further instructions
on folding and unfolding the VT Plus.
d5842a
Escaping hydraulic fluid can cause serious
personal 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 4-5.) Keep all components (cylinders,
hoses, fittings, etc.) in good repair.
