after checking the 'spools' on the control valve you may want to try servicing the transmission.
change the fluid and clean out the sump screen at the base of the housing where the return supply line hooks to.
if it has not been serviced in a while it could be clogged up not letting enough fluid through which would cause the delay in the clutch packs engaging.
this is a common occurance in all lifts that don't get the transmission serviced properly.
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