Great Plains 2SNT30 Assembly Instructions - Manual (Page 11)

4/8/04
1-10
MARKER HYDRAULIC SYSTEM INSTALLATION (CON’T.)
INSTALLING: 24 or 30' DUAL MARKER HYDRAULICS
GENERAL NOTE: JIC fittings do not require high torque. JIC and O-ring fittings do not require sealant. To avoid crack-
ing fittings or castings from overtightening, DO NOT use plastic sealant tape.
REFER TO THE PICTORIAL HYDRAULIC SCHEMATIC Fig. 9 WHEN INSTALLING: 24 or 30' DUAL MARKER HY-
DRAULICS
1. Attach the 90˚ swivel elbows (#4) to the base and rod end of both marker cylinders (#3).
2. Uncoil and attach hoses (#5 & 6) to the swivel elbows (#4) attached to the marker cylinder (#3). Note that the longer
of the two hoses goes to the rod end of the cylinder. Route these two hoses through the frame member cut-outs and
hose clamp. Parallel to the hoses feeding the outer gage wheel cylinder as shown in Fig. 10 on page
1-11. Place the
hoses in the clamps later, after the free ends of the hoses are plumbed.
3. Referring back to schematic Fig. 9, Bolt the selector/sequence valve (#7) to the tab welded on the carrier lug cross
member. (The carrier cross member can be identified as part #5, page 1-1 in the Main Frame Parts Drawing in the Parts
section of your 2snt Drill Owners Manual). The valve is held in place with bolts (#9), flat washers (#10), lock washers
(#11) and nuts (#12).
4. As noted in the schematic, Fig. 9, switch the elbow and straight fittings on ports A and G of the sequence/selector
valve (#7). Do the same for ports B and J. Next, install the two elbow fittings (#13) on ports E and F.
5. Locate the two long hoses (#1) coming from the tractor, going to the fold cylinders. Break the first hose at the "T"
between the rod end of the fold cylinders, the second at the flow divider. Take these same two hoses and install them
on the selector/sequence valve (#7) ports A and B.
6. The two hoses just removed from the fold cylinders are replaced by two shorter hoses (#2). Run one from the "T"
between the rod end of the fold cylinders to port G on the top of the selector/sequence valve (#7). Run the other from
the fold cylinder's base end flow divider to the adjacent port J.
7. The last hoses to connect should be the four coming from the marker cylinders. Connect the base end hoses (#5)
to ports E and F on the selector valve (#7), and the rod hoses (#6) to ports C and D as shown.
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Dual Marker Hydraulic Schematic
Fig. 9