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the crane manufacturer will use generic components where ever possible
as the crane is a specialist piece of equipment it will require approved parts to keep it certifiable
take it to a crane repair facility and have it done properly
Remove the bonnet, drain oil and water remove radiator and fan remove all hoses cables and wiring attached to the engine. take weight of engine with a floor crane support the transmission .uncouple transmission from engine remove engine mount bolts , take a little more weight with the crane and slide engine clear of transmission , lift clear of car and slide crane clear to engine stand.
ive heard of folks doing it without a crane but i would not try it , alignment is too critical with getting guides and stops back in and with nothing to move boom that would be too difficult
anyways: suspend boom end with double straps from crane , disconnect hydraulic/electric swivels/plugs at truck end lift end of boom slightly with boom all the way extended straight out , remove acess panel (both sides) at jct of upper/lower boom section . remove C clip one side drive out pin oppisite side (wiggle boom to clear pin) locate stops in lower section boom end unbolt , slowly pull upper boom with crane away take care of hydraulic lines and electric wires set on floor on wood cribbing , locate bottom of cylinder truck end find C clip and pin Might be behind a trim cover that might need to be remove drive out pin also remove bottom cylinder hyd hose connect crane to cylinder end move out a foot or so remove top cyliinder hydraulic hose then carefully slide out cylinider with crane , Note if your valves are not tight and new oil will leak back and cause boom base to sag when you unhook hydraulic hoses , your gonna need to block this up with wood cribbing just in case
reverse removal process to install new one , also i would not just install a new seal (you can) with out having cylinder recromed I'll bet it's rusty thats what tears the seals up
and allways replace entire oil volume in hydraulics your old seal is in old oil not good for the new one
You can get them from the Crane Website: http://shop.crane-usa.com/products/category/1722.214.171.124.563.796126.96.36.199?pp=8&pg=3
But the bottom unit of mine is no longer working and I could send the top part to you instead of throwing the whole thing out.