Engine hoist question

[Steven Trovato <strovato@optonline.net>]

I have a hydraulic engine hoist I purchased about a year ago.  I've only 
used it a few times.  If I leave an engine on it, it will eventually drift 
down to the ground.  My question is, what is considered normal?  How long 
should the hydraulics be able to hold a load?  Thanks.

-Steve Trovato
strovato@optonline.net