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86
Great Plains Manufacturing, Inc.
NTA607/2007HD
166-283M
04/09/2019
Weight Transfer Bypass Valve
Adjustment
The weight transfer bypass valve must be adjusted before
adjusting the weight transfer circuit.
A bypass valve is plumbed into the weight transfer
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.
Tractors with Pressure Compensating Closed Center
Hydraulics (PC Closed)
Close bypass valve for no oil flow by turning knob on
valve clockwise completely. Always operate the drill with
the bypass valve closed.
Tractors with Load Sensing Closed Center
Hydraulics (LS Closed) or Pressure Flow
Compensating (PFC) Systems
The weight transfer bypass valve must be adjusted to
protect the tractor. Do the following procedure.
Equipment Damage Risk:
Failure to use the bypass valve on load-sensing tractors may
cause major tractor damage.
1. Release lock ring
on bypass valve
.
2. Turn the knob on the bypass valve
all the way
clockwise to the closed position.
3. Tighten the lock ring.
4. On the tractor, turn the flow on this circuit down to no
more than 45.5 L/min (12 gpm).
5. Engage tractor hydraulics to weight transfer circuit.
Lock hydraulic lever on tractor for continuous
operation.
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Figure 70
Bypass Valve
38340
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