Bobcat 643 no lift power when warm

[d_calabria]

Hey guys, Bobcat 643 works great when cold - lift rams do leak down slowly. Although when its warm or i have been operating for about an hr i loose all lift power? Any idea what could cause this/any solutions? Thanks in advance

 

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probably lift arm seals, when the hydraulic fluid warms up and gets thinner it escapes past the seals