Great Plains 4000TM Assembly Manual - Manual (Page 32)

28 3500-4000TM Great Plains Manufacturing, Inc.
586-537Q-ENG 12/03/2013
Purging Hydraulic System
Note: When lift and fold hoses are routed and hooked
up to cylinders and valves the systems will need
purged of air. Purging the lift and fold system now
will allow the wings to be folded and unfolded. The
machine may also be raised up or down for ease
of gang assembly installation.
Refer to Figure 22
87. Charge the lift system first. Extend the lift cylinders
(black handles) until the center section is fully raised.
Remove the cylinder transport locks
and store on
lift straps . Raise and lower the lift system several
times to purge air from system. Watch for leaks and
retighten fittings if necessary.
88. You may now charge the fold system. Before charg-
ing the inside wing, fold cylinders and outside wing
(Model 4000 only), fold cylinders make sure the
rod end of the cylinders are un-bolted or un-pinned
and block
is placed under cylinders as shown, so
that when the rod is extended, it will clear the wing
fold brackets. Extend the fold cylinders
and
(green ends) completely and then close them.
Extend and retract the cylinders several times to
purge air from the system.
89. Now the rod end of fold cylinders and may be
hooked up to wings with the 1 x 3 1/8 usable pin ,
1.5 x 1.0 x.075 machine washer and 3/16 x 2 cotter
pin. Bend cotter pin over to secure.
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