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ASSEMBLY
Phasing System
The hydraulic phasing cylinder kit requires one double acting hydraulic circuit it for operation. The system is
comprised of three hydraulic cylinders and a depth stop valve to allow s all wheels to be raised and lowered
simultaneously.
Before operation all air must be purged from the hydraulic lift circuit. Fully raise the cutter and hold the tractor's
hydraulic control lever forward for 5 minutes to allow oil to fully circulate through the phasing cylinder circuit.
During operation the phasing cylinders should periodically be phased. The hydraulic lever should only have to
be held for 10-15 seconds to ensure system is phased.
Hydraulic Phasing Cylinders
A hydraulic phasing cylinder system works by synchronizing the operation of a number of hydraulic cylinders
so that they extend and retract at exactly the same rate. This allows a multi-section machine such as a rotary
cutter to be raised and lowered evenly across its width. Because a hydraulic cylinder has a 'cylinder rod'
attached to the 'piston' the effective area on the rod side of the cylinder is less than the basic effective area of
the cylinder.
In order to achieve synchronization cylinder diameters are reduced as cylinders are connected to the 'main
cylinder' so that the effective area of the upstream cylinder on the rod side is the same effective area of the
downstream cylinder on the piston side. The result of this stepping down of cylinder diameters is that all
cylinders move at the same rate resulting in a 'level lift'.
The phasing system hoses are marked in yellow at the tractor connection.
FX-742 07/16
Assembly Section 3-4
© 2016 Alamo Group Inc.
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