3S-3000/F/HD/HDF
Preparation and Setup
21
2018-06-18
195-441M
Setting the Bypass Valve
A bypass valve
is plumbed into the opener down
pressure circuit. Tractors with load-sensing,
closed-center hydraulics require this bypass valve to
protect the tractor hydraulic system.
If you are unsure what type of hydraulic system is on
your tractor, contact your tractor manufacturer.
Turn the locking disc
counter-clockwise to enable
adjustment.
Turn the adjustment knob
counter-clockwise to
increase flow.
Turn the adjustment knob
clockwise to decrease flow.
Turning it fully clockwise stops all bypass flow.
Tractors with Open Center Hydraulics
Release locking disc. Close bypass valve for no oil flow
by turning knob on valve clockwise completely. Tighten
locking disc. Always operate the drill with the bypass
valve locked closed.
Tractors with Pressure Compensating
Closed Center Hydraulics (PC Closed)
Release locking disc. Close bypass valve for no oil flow
by turning knob clockwise completely. Tighten locking
disc. Always operate the drill with the bypass valve
locked closed.
Tractors with Load Sensing Closed Center
Hydraulics (LS Closed) or Pressure Flow
Compensating (PFC) Systems
Machine Damage Risk
: Failure to use the bypass valve on
load-sensing tractors may cause major tractor damage.
1.
Release locking disc. Initially close bypass valve for
no oil flow by turning knob on valve clockwise
completely.
2.
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.
NOTE:
The faster openers raise and lower, the greater
potential for oil heating, premature wear or tractor
damage.
3.
Engage tractor hydraulics and lower openers. Lock
hydraulic lever on tractor for continuous operation.
See “
Figure 11
Bypass Valve
19045
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