nevsatII said:
It's the small cylinder on the port side. It looks like you have to unscrew the top of the cylinder off with a spanner wrench, change the seal and replace. What I'm worried about is all the fluid going to be lost.
A few things to keep in mind:
First of all, make sure the motor is locked on the stops to prevent it from falling down.
The seal covers on the cylinder may or may not come off easily or undamaged. Sometimes the spanner doesn't do it. (The Yami tool is expensive, cheaper ones ,Harbor Freight, will do but make sure you get the correct pin spacing) It is common to have to whack it with a punch or 'chisel' to free it up. I would plan on have a new cap on hand as well as the seals. Take a good look at the piston rod beforehand to make sure it is not corroded. If it is, you may need to replace the rod.
If you have the time, diassemble and inspect before buying parts so that you get only and all the parts needed.
Don't worry about he fluid. My advice is to drain out as much of the old as you can and fill up with fresh. This is done to eliminate any water that might have gotten into the fluid. Water will corrode the internals.
Of course, you will need to bleed the system but that is relatively easy. Cycle the rods a few times, check fluid and add as needed. Repeat that process several times. Do not stand under the motor and keep your fingers away from pinch points. The motor could drop unexpectedly as the air is flushed out.
Good luck