How do I replace the seal in one? It on a Donzi 38 ZX. The ram says "Donzi by vpm" I think.

Find a Parker store or a local hydraulic shop.

http://www.offshoreonly.com/forums/d...m-leaking.html

I think it might be WPM for Warlock Performance Marine, but I don't know if they still exist.

Not sure exactly what servo that you have. But it cant be that different from any other hydraulic servo. Wrench's, Rags and drip pan at a minimum.Take servo off the boat, remove the end cap, (on a very clean surface). Pull out the piston and remove the orings. Find replacement orings and put it back together in reverse order. Remember to lube the orings in Hyd. fluid before you install them. I had one leaking a while back so I fixed it. It was so simple that I did the other three just because.

Mcmaster carr should be a help . If the shafts are bad and the shop is out of business I can help you .I have done some for Marine Machine due to not making them anymore

Oops forgot about that. I was looking more for the procedure for taking it apart. I saw a few videos online and it doesn't look like it's to bad. Hardest part will probably be finding a shop with the seals.

And your right it's WPM
Thanks

it will be a standard o-ring. nobody builds a hyd cylinder of such a size that custom O-rings and seals have to be special made...

possibly even in an assortment from hardware store. but a tractor supply-service place will have them or know where to order them.

I'm having the hardest time getting the end off. I have the square end in a vice and my adjustable wrench on the end I want to remove but the wrong end is turning. When I try and clamp the the middle section to the vice it just slips out. I'm afraid to tighten it to hard as I might collapse the tube. Any suggestions?

Same thing happened when I took mine to a shop to get it rebuilt. I stuck around for the dissassembly and the wrong end came loose, of course.

Go ahead and let it come apart how ever you can, when the wrong end comes off, wrap electrical tape and a rag around the tube, clamp it in the vice close the the opposite end. Find/buy a plug or a bolt to thread into where the hydraulic line threads in and then with an old serpentine belt ot a strap wrench if you have one...use that and use the bolt sticking out as the leverage to help break the end cap loose.

This thread reminds me I need to go back to this shop and get the seals and o-rings to rebuild the other cylinder.

I went ahead and let the other end unscrew and then removed the the ram from that end and I was able to pull out the leaking o ring. Only issue now is where to get the new ones. I bought a standard o ring kit and it doesn't have everything. I'm not having very good luck finding anyone locally.