I’ve got a 45’ Eagle towable manlift and bottom boom is leaking down.

[Puppypunter]

Here’s the whole cylinder I’m guessing this extended with the boom cradled?

 

[oldnslo]

Which port on the block connects to the tube running up to the rod end? the nose on one of the valves must connect to this port? That would be the valve for controlling extend.
The hose that retracts the cylinder would connect to port 2 or lower side port of this valve. This would also connect to top port of other c’balance valve.

Same thing the other valve nose of that valve should connect blind or cap end of the cylinder.
The hose that extends the cylinder would connect to port 2 or lower side port of this valve. This would also connect to top port of other valve.

Difficult for me to determine connections even with the pictures provided.

If it would help I could draw you a schematic showing connections.

 

[Puppypunter]

What do you mean by “port 2?” The ports I have are stamped “R” “”E” and “BD” and then obviously what I’m calling red and blue valves.

 

[Puppypunter]

Or do you mean the holes that the the valves are threaded in are port 1 and port 2?

 

[Puppypunter]

Here’s another one, the one that has the plug in it is “BD.” The blue line is where the blue valves nose would be coming out compared to the red valve.

 

[oldnslo]

Puppy,
Sorry for the confusion on port identification.

On the valves there are three connections or as I have called them ports. These may or may not correspond to the stamped labels on the cylinder.

On the valves:
Nose of the valve is port 1 and must connect to the cylinder

Lower side or middle port 2 must connect to one of the hoses to the directional control valve. These could be the R & E ports.

I have no clue what BD is other than like you suspected bleed

 

[Puppypunter]

Hey I really appreciate everyone’s help and support through this matter, I believe that metal chip was what had it leaking down.

I just blew out valves real well and the holes they thread into along with the hose connections ports. I could never get either valve to come off it’s seat I don’t think but hopefully any piece of that metal that was stuck under the seat is now in the filter (fingers crossed). It’s not leaking down like it was, it’s got a very slow creep, nothing like it was before though. Hopefully that’s all it was because I briefly looked up the valves on the internet and couldn’t find anything (although I guess a phone call would be in order if they have phone service in Florida)

Thanks again guys.
Regards
James from new mexico

 

[oldnslo]

James
Thanks for reporting back on potential repair and fix. You should be able to contact the local Sun Hydraulics distributor and get replacement valves. They are still making that exact model.

 

[wdchyd]

I quick way to find out if it’s the counterbalance valve or the piston seals…..raise the unit up off the frame, get it into the creep down mode, turn off the engine, then immediately support the structure with another piece of equipment just off the truck frame, remove the two cylinder hoses, then lower the support equipment. If the valves are compromised oil will leak out from one or more fittings at the cylinder base at the rate of descent. If no oil leaks out of fittings and still creeping then the piston seals in the cyl are bypassing.

 

[wdchyd]

…….and I’m pretty sure I have those valves in stock.