Bypass Valve - Kongskilde FCT 1260 Operator's Manual

BYPASS VALVE

Fig. 2-1 A distinction is made between two types of tractor hydraulic systems: "open centre
hydraulics" (also known as "fixed pump") and "closed centre hydraulics" (also known
as "variable pump").
If the tractor is of the "open centre" type, the bypass valve must be open to permit
the passage of oil back to the tractor, and will only be activated when a function on
the machine is activated. The valve may be altered using the thumbscrew if it is not
open.
If the tractor is of the "closed centre" type, the bypass valve must be closed to
permit the tractor to close the oil flow automatically when no functions are active. The
valve may be altered using the thumbscrew if it is not closed.
The bypass valve is located on the left hand side of the valve block.
None of the hydraulic functions use more than around 10 litres of oil per minute.
You should therefore set the oil flow from the tractor to 10 l/min. of oil if possible. The
bypass valve has been designed for a maximum of 40 l/min. Pressure loss will occur
if this limit is exceeded, which can cause the temperature of the oil and valves to
increase.
The bypass valve must be set to closed centre if the machine has been fitted with
LS.
PIGB-206B-02 FCT 1260-1460 0218
2. CONNECTING TO THE TRACTOR
Fig. 2-1
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Closed centre
Load Sensing
Open centre