Great-plains YP825AR Operator Manual User Manual download pdf (Page 30)

26 YP825AR Table of Contents Index Great Plains Manufacturing, Inc.

401-923M Table of Contents Index 2014-06-17

About the Marker Shut-Off Valve

Refer to Figure 15

This valve is only present on planters equipped with

optional ﬁeld markers. It is located on the right side of the

lift structure.

The marker hydraulic circuit is shared with the lift circuit.

Unless disabled by the shut-off valve, a marker retracts

during lift, and the other side extends during lower.

Refer to Figure 16

This shut-off valve, when closed, prevents marker

extension or retraction. Markers must be disabled by this

valve during planter fold, and during ﬁeld operations not

requiring use of markers.

When the shut-off valve is open, any lift operation results

in folding of any extended marker. When the shut-off

valve is open, any lowering operation results in extension

of a marker on the alternate side, based on the internal

state of the marker sequence valve.

Frame and Overhead Crushing Hazards:

• Never open the shut-off valve with the frame raised.

• Never close the valve under a raised and unlocked frame.

• Never close the valve with a marker extended.

When the shut-off valve is open, the marker circuit is plumbed

in parallel with the lift circuit at all times. An equipment

malfunction could result in unexpected frame and/or marker

motion in some situations. You could be under the frame

operating the valve in some of those situations. Serious injury,

death, and/or substantial property damage can result.

Depending on the internal state of the sequence valve,

if the opener frame is raised and not locked up, and the

shut-off valve is opened, frame weight may force oil from

lift cylinders to marker cylinders, possibly resulting in:

▲ unexpected frame lowering, and

▲ simultaneous unexpected marker extension.

This could happen with hydraulics off (or disconnected)

and all frame control switches off.

If the opener frame is raised and is locked up, and the

valve is open, unexpected marker extension does occur

during lowering from transport lift. This a potentially

hazardous situation.

If the valve is closed with a marker partially or fully

extended, the marker cannot fold during lift, and if the lift

is prematurely stopped, the valve state is changed, and

the lift reversed, there is some chance of having two

markers extended. See “Dual Marker Operations” on

page 36.

Figure 15

Marker Shut-Off Location

34796

Figure 16

Marker Shut-Off Valve

34707

CLOSED OPEN

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