2018-07-24
401-312M
3PYP
Appendix C: Initial Setup
158
LS Closed/PFC Down Pressure
Tractors with Load Sensing Closed Center Hydraulics
(LS Closed) or Pressure Flow Compensating (PFC)
Systems
1.
Release locking disk
.
2.
Close bypass valve
for no oil flow by turning
knob
on valve clockwise completely.
3.
Tighten locking disk
.
4.
With tractor at half throttle, adjust flow-control valve
on tractor so openers raise and lower at a
reasonable speed. Keep tractor at one-half throttle
for remaining steps.
Faster opener raise/lower increases potential for oil
over-heating, wear and tractor damage.
5.
Engage tractor hydraulics and lower openers. Lock
hydraulic lever on tractor for continuous operation.
6.
Release locking disks
and
. Adjust
pressure-control valve
knob
for opener down
pressure so gauge
is at 600 psi.
7.
While watching gauge
, slowly turn knob
on
bypass valve
counterclockwise. Adjust bypass
valve
just until needle on gauge
begins to move
down from 600 psi. Use locking disk
to lock
bypass valve at this setting. (See also note below.)
8.
Adjust pressure-control valve
knob
to desired
opener down pressure per “
” on page 54. Tighten locking disks
and
.
While 600 psi is a good starting point for setting the
bypass valve, if you consistently operate the planter with
low opener down pressure you can set the bypass valve
below 600 psi. If you consistently operate the planter
with very high opener down pressure, you may need a
bypass-valve setting above 600 psi.
Machine Damage Risk:
Failure to use the bypass valve on load-sensing tractors may
cause major tractor damage.
The higher the bypass pressure, the greater the
potential for oil over-heating and tractor damage.
However, for proper opener operation the bypass
valve must be set at least 300 psi above the opener
down-pressure setting when the tractor is at one-half
throttle. Therefore, you should set the bypass valve as
low as possible while staying at least 300 psi above
the opener down pressure setting.
Figure 157: s/n
Hydraulic Down Pressure Valves
29803
5
7
6
1
2
3
4
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