Great Plains 3PYP Operator Manual - Manual (Page 57)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 53
2014-09-09 Table of Contents Index 401-312M
Cart Weight Transfer
On s/n A1025S+ planters, some of the cart weight can
be transferred to the mainframe by retraction of the
lift-assist cylinders, with a weight-transfer pin in place.
This operating mode is compatible with wing-lock,
wing-flex and hydraulic down-pressure planters.
1. Disconnect the 3-point top link.
Refer to Figure 54
2. Install the lift-assist weight-transfer pins . The pins
are stored in a plate behind the cart parallel arm
pivot weldment. Install them in the large holes at the
bottom of the rod-end lug in the frame-to-cart parallel
arms.
3. Remove the lift-assist shear bolts from the small
holes
below the lift-assist rod-end lug upper pivot
pins. Store the bolts in the plates behind the cart
parallel arm pivot weldments.
4. Fully retract the lift-assist cylinders when lowering
the planter in the field.
Priority Flow Hydraulic Systems
On some tractors with load-sensing hydraulics, the
tractor remote circuit #1 is capable of taking nearly
100 percent of available hydraulic flow. Operating the
openers or markers on circuit #1 will starve the other
circuit, making one function inoperable.
To operate markers and constant opener down pressure
at the same time, connect the lift assist to circuit #2 and
the markers to circuit #3.
Figure 54
Weight Transfer Pin
29201
1
2
1
2
Note: On some tractors with very positive remote
hydraulic checks, a slight increase in the reading on
the pressure gauges may occur after the tractor
remote lever is returned to neutral. This is caused
by back pressure on the opener cylinders and may
be ignored. The NET OPERATING PRESSURE on
the opener cylinders is maintained at the pressure
you selected while the tractor remote lever was
held forward–not at the “apparently increased”
pressure. Reactivating the tractor lever forward
confirms this.