Great Plains 2S-2600 Assembly Instructions - Manual

Great Plains Mfg., Inc.
© Copyright 2003 Printed
Used with:
Update Instructions
195-298M
2S-2600 2 Section Folding Drill
Counterbalance Update
• 2S-2600
General Information
The 2S-2600 drill uses a P.O. check in the opener lift circuit
to lock the openers in the raised position. This P.O. check
remains locked until the operator wants to lower the open-
ers. When lowering, oil is supplied to the base end of the
opener cylinders. Oil pressure builds on the base end of
the lift cylinders until a pilot line signals the P.O. check to
open.
By design, the P.O. check will open fully when it receives a
pilot signal. When fully open, the openers, pulled by grav-
ity are free to fall. During this free fall, if the oil supply to the
base end of the opener cylinders is too slow to keep up,
the oil pressure drops and the pilot signal tells the P.O.
check to close. Once the P.O. check closes, oil from the
tractor can "catch up". Pressure builds and the P.O. check
opens again. This locking and unlocking can happen sev-
eral times as the openers are lowered.
A new counterbalance valve replaces the P.O. check. In-
stead of going to full open when the valve gets it’s pilot
signal, the counterbalance valve will only partially open.
The opening is proportional to the pilot signal. The coun-
terbalance valve allows the operator to push the openers
down in a smooth, controlled motion.
These instructions apply to:
195-297A 2600 Counterbalance Valve Update
Manual Update
A copy of the updated parts manual is available through
your Great Plains dealer.
Refer to the 2S-2600 operator’s manual for detailed in-
formation on safely operating, adjusting, troubleshooting
and maintaining the 2S-2600. Refer to the parts manual
for part identification.
195-200M-A Operator’s Manual
195-200P
Parts Manual
Before You Start
Page 7 is a detailed listing of parts included in the Couter-
balance Valve Update. Use this list to inventory parts
received.
Tools Required
• Basic hand tools
When you see this symbol, the subsequent instructions and
warnings are serious - follow without exception. Your life and
the lives of others depend on it!
!!
10/7/2003