ASSEMBLY
FX-520 06/16 Assembly Section 3-4
© 2016 Alamo Group Inc.
ASSEMBLY
Rephasing Groove
Hydraulic oil moves from one cylinder to the next through and indentation in the cylinder wall known as a
‘rephasing groove’. When the cylinder is fully extended this groove creates a bypass over the piston main seal,
allowing oil to flow to the next cylinder in the set. Since these grooves are quite small it will often take a number
of minutes for oil to completely circulate through the set of cylinders.
On initial startup of a phasing cylinder system it may take a number of minutes to force oil through the system
and purge out any air in the hydraulic lines. During normal operation small amounts of oil may leak past piston
seals causing cylinders to fall out of synchronization. Synchronization can be restored by fully extending
cylinders and holding the circuit open for period of time.
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