2500# cyl in a 2700# system

gusbratz

Member
The E-stick cylinder on my backhoe is scored real bad inside. So I ordered a 3” bore 48” stroke prince cylinder. Figured I would just use the rod out of mine in the new cylinder since it has the right end on it and I assume my OEM cat cyl rod has better chrome and harder steel than the prince. The cyl came today and I realized it is a 2500# cyl. My machine runs 2700# hydraulics. Think it would hold up if I used it? It just slides the e stick in and out, but it will see full pressure every time I run it in and bump it till it stops moving. Any thoughts?
 
If I were in your position I'd check the system and see if there is a port relief on both sides of the extend cylinder circuit. If there is there would definately be no problem using the cylinder if you set the port relief to 2500. By doing that it would pop before main relief did so that one cylinder would never see the full 2700 psi of system pressure.

Beyond that my only suggestion would be to call the cylinder mfg and ask them. Most all hydraulic components are designed with a safety factor enginered in to insure they don't rupture due to a pressure spike, etc. That said, 200 psi difference isn't that much so it might very well work just fine but given the dangers involved with high pressure oil I still wouldn't feel comfortable saying it would definately work without consulting the mfg.
 
Mixing and matching cylinders components sounds like a recipe for problems. Is the Prince cylinder a threaded end, tie rod or cir-clip? That's the most likely place for a cylinder to let go if over pressured. A backhoe requires an industrial cylinder, not a utility cylinder and it is common to hit the relief valve. Are the inside dimensions(length and bore) identical? Is the rod the same diameter? Unless they're identical in every way, I don't see how you could interchange parts. Why not just get a new barrel made to match the scored one?
 
Don't know what the HDY # was on my old backhoe, but I did the same thing as the new JD cylinder was twice the price , maybe three. The only thing I did was bend the pin connecting the rod end as it was round and not square like the old one. If I had to do it over again, I would machine a block and have it welded to the round rod to center it and spread out the load on the pin to the sides and not in the center. It worked for 10 + years and was on it when I sold it. I'm not claiming it's the right thing to do.. just saying no guarantees ect. just my 2 cents.
Jo
 
Well the machine is sort of a fixer upper (the only reason it was priced low enough for me to buy it). 2 bad cyl’s on the hoe, multiple cracks in the backhoe and generally just behind on maintenance. Due for all new fluids and filters. Needless to say I’m on a budget and I’m just all around cheap to begin with. I called cat about the cyl’s and they are no longer available. Looked around a bit and a used one is around 1000$-14000$. I thought about just replacing the barrel on mine but the honed tubing is sold by the inch and a 48” piece was more expensive than just buying a total new cyl from prince. Plus I would have to cut threads into it to screw my packing into which would not be cheap. So that is why I bought a utility cyl for around 330$. If you know of a hydraulic shop that can re-barrel a cyl affordably I’m all ears because I still have the bucket cyl to do. The previous owner couldn’t get the packing gland to unscrew so he took a torch to it and cut the cyl apart around the rod.
 
Don't know where your located, but you might try giving SHP and HCR both a call. Both are somewhat local to me, with SHP being about an hour or so South into SCI, and HCR being about an hour North, and I've done business with both numerious times over the years (SHP the most). Both places do good work at reasonable prices. I say that dependent upon what you call reasonable, cause a custom cylinder can often be more expensive than a standard, off the shelf one, but still less than one from the OEM. Hope this helps, and good luck.
SHP

Hyd Cyl Repair
 
I'm not sure if this type of cylinder would be suitable, but surplus center shows a 3x48 Prince 3000 PSI tie rod cylinder for $363. I'm not sure if that would be a better price than what you were quoted or not.
Zach
cylinder
 

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