Great Plains 2020 Vintage Drills - Manual (Page 11)

03-01-92 1-11
DUAL FLAT FOLD MARKER HYDRAULIC ASSEMBLY INSTRUCTIONS
NOTE: JIC fittings DO NOT require high torque. JIC and O-ring fittings DO NOT require sealant. ALWAYS use
liquid pipe sealant when adding or replacing pipe thread fittings. To avoid possible danger of cracking hydraulic fit-
tings from over tightening, DO NOT use plastic sealant tape.
Refer to figure below and page 13 for the following instructions:
1. Attach the selector / sequence valve to the selector valve mount the T-Frame (#11) using 3/8”
bolts (#20) flat washers (#22) lock washers (#21) and hex nuts (#23).
2. Route hoses from the selector / sequence valve down the drill box frame tube. Check hose
routing for pinching and kinking of hoses and securely attach with plastic cable ties (#13).
3. Attach hoses to cylinder ports. Be certain to double check for correct port location back to the
sequence valve.
4. Detach existing tractor hoses (#18) & (#19) from fold cylinders. Attach 66” hose (#10) and 42”
hose (#7) and tractor hoses (#18) & (#19) to selector / sequence valve (#11) and wing cylinders.
Assemble remaining hoses as indicated.
IMPORTANT! BEFORE CONTINUING WITH THESE INSTRUCTIONS, READ
“BLEEDING THE HYDRAULICS” INSTRUCTIONS ON PAGE 4. BLEED ALL
THE AIR OUT OF THE HYDRAULIC SYSTEM BEFORE FOLDING THE
MARKER.
5. Cycle marker as instructed on page 4.
6. When ready to fold wing boxes for transporting, position the handle on the selector/sequence
valve towards the port marked "G". Hydraulic oil is now diverted to the fold cylinders
NOTE: Raising and lowering speed of the markers is due to the internal orifice in the sequence
valve necessary for proper operation of the valve spool.
EXCESSIVE SPEED CAN CAUSE MARKER DAMAGE.
DO NOT ALLOW ANYONE NEAR THE DRILL WHEN CYCLING THE MARKER!
NOTE: To avoid cracking the hydraulic pipe fittings, DO NOT use plastic sealant tape. Use liquid
sealant to seal hydraulic pipe fittings only.
!
!
DOUBLE SELECTOR VALVE
MOUNT ON T-FRAME