Great Plains 3PYP Operator Manual - Manual (Page 167)

Great Plains Manufacturing, Inc. Table of Contents Index Appendix D: Older Equipment 163
2014-09-09 Table of Contents Index 401-312M
A1006S- Hydraulic Bleeding
Re-phase Lift Cylinders
(Applies only to s/n A1006S- planters with rephasing
double-acting cylinders. Single-acting and
parallel-plumbed double-acting cylinders on later
planters never require rephasing.)
In typical use during a single planting operation, it is
normal for the lift cylinders to get out of phase, resulting
in uneven raising and lowering of the 3PYP.
Every 8- to 10 passes, re-phase the cylinders with this
procedure:
1. Raise the planter completely, and hold the hydraulic
lever or switch in Extend for several seconds after
the planter reaches full elevation, or until all cylinders
are fully extended.
2. When all cylinders are fully extended, momentarily
reverse (Retract) the control to lower the planter
1 ⁄
2
inch.
A1006S- Lift Bleed
If re-phasing does not restore proper operation, bleed
the system as follows:
3. Loosen the JIC fitting at the base end (top) of the
left lift cylinder.
4. Extend the lift circuit until fluid appears at the
loosened fitting. Set control lever to neutral and
secure the fitting.
5. Loosen the JIC fitting at the base end (top) of the
right lift cylinder.
6. Extend the lift circuit until fluid appears at the
loosened fitting. Set control lever to neutral and
secure the fitting.
7. Retract the circuit. Set control lever to neutral.
8. Disconnect both lift cylinder rod ends.
9. Extend the lift circuit until both cylinders are fully
extended.
10. Loosen the JIC fitting at the rod (bottom) end of
the right lift cylinder.
11. Retract the circuit until fluid appears at the loosened
fitting.
12. Set circuit control to neutral and secure fitting.
13. Re-pin rod ends.
14. Unless it is suspected that a large amount of air is in
the line between the cylinders, rely on the normal
re-phasing operation to purge it. Otherwise...
15. Loosen the JIC fitting at the base (top) end of the
right cylinder .
16. Extend lift circuit until fluid appears.
17. Set circuit to neutral and secure fitting.
18. Extend and retract circuit several times.
Figure 160
Re-phasing Lift Bleed
25385
L
R
1
3 2
4
1
2
3
2