Great Plains V300 Assembly Instructions - Manual (Page 17)

Great Plains Mfg., Inc.
Installation Instructions 17
11/08/2006 148-771M
Purge and Re-phase System
!
WARNING
Escaping fluid under pressure can have sufficient pressure to
penetrate the skin causing serious injury. Avoid the hazard by
relieving pressure before disconnecting hydraulic lines. Use a
piece of paper or cardboard, NOT BODY PARTS, to check for
leaks. Wear protective gloves and safety glasses or goggles
when working with hydraulic systems. If an accident occurs,
see a doctor immediately. Any fluid injected into the skin must
be surgically removed within a few hours or gangrene will
result.
Refer to Figure 25
127. Close the Bypass valve (48) (turn fully clockwise).
128. Close the Adjustment valve (44) (turn fully clock-
wise), and open (clockwise) on full turn.
129. Purge the hydraulic system of air per the instruc-
tions in the Operator’s Manual.
130. Re-phase the lift cylinders per the instructions in
the Operator’s Manual.
131. Inspect the system for leaks. Raise and lower drill
once or twice, and note where the new hoses rub
other implement components, or need to be pro-
tected from other moving parts.
Post-Installation Lift Cycle
The gauge wheel lift cylinders are on the same circuit
as the new pressure compensating system (although
the lift cylinders do not rely on the compensated pres-
sure). Be aware of, and check, the new lift/lower
sequencing.
Raising:
a. Gauge wheels lift drill.
b. Opener sub-frame lifts openers.
Lowering:
a. Gauge wheels lower drill onto cylinder stops of
gauge wheel cylinders.
b. Opener sub-frame lowers opener to the ground
and pressure compensating valve pressurizes
openers to selected setting.
132. Select ties (26) 800-035C,
(CABLE TIE .31X28 8DIA 120LB).
Secure the new hoses as necessary to protect
them in field operations.
Figure 25
Closed Center Valves
25185
48
43
44
➀
➁