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We O/H both the 2-rear & primary lift cylinders.
When we lift the mast up it stays in position but when we lower it down it will drift. This happens in any stage...
there are check valves in the bottom of the cylinders to verify remove cap and check for fluid in the top of the cylinder as this has lower packing as well as packing in the cap
assuming its not the primary cylinder if your mast is staging correctly it is ok
We normally instal a hyd switch/gate/ball valve lock off onto the hyd pressure feed line - with the valve open raise mast - then with hyd levers in neutral. close the valve - if it drifts down its the seals in the cylinder. if it stays up its normally a hyd control valve( Spool)
Safety tip -- relieve all hyd pressure before installing check valve - lower mast to ground - these machines will bite you....or kill you....
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