Unverferth Rolling Harrow II, Operator'S Manual/Parts Catalog

Page: 19 / 66

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COMMENTS
Optional - available on wings 7' & larger
Located on L.H. side of hitch frame tube
DESCRIPTION
Base Wheel Cylinders
Wing Wheel Cylinders
Wing Fold Cylinders
Orifices
Stack-Fold Valve
QTY
2
2
2
3
1
ITEM
1
2
3
4
5
UNITS WITH STACK-FOLD WINGS
NOTE: For plumbing diagram, refer to "Hydrau-
lics Diagram 2". Refer to parts section (pages
60 to 63) for hydraulic component detail listing.
OPERATION (HOW IT WORKS)
All cylinders on the ROLLING HARROW II are
double acting cylinders. They are all teed
together into one circuit. Because of orifices
placed in the wing-fold segment of the circuit,
the wheel axle cylinders will extend first, fol-
lowed by retracting of the wing-fold cylinders.
IMPORTANT: Refer to page 28-29 for proper
wing and valve combination of your machine.
The stack fold valve is a pilot operated, double
bi-pass valve. This valve allows oil to flow to
one outlet port or the other in one direction,
and free-flow (from both ports) in the opposite
direction.
The stack fold valve allows the L.H. wing to
fold first, until the wing contacts the valve
(shifting the spool of the valve), followed by
the folding of the R.H. wing.
When hydraulic oil is directed in the opposite
direction, the wheel axle cylinders will retract
first, followed by (because of difference in the
wing position from right-to-left) extending the
R.H. wing fold cylinder.
SERVICE
HYDRAULIC DIAGRAM #2
OM-00815
R.H. L.H.