Prentice 120e help!! Driving me crazy!

[Fulp428]

I have a prentice 120e. A moron took two pto pumps and made one and the housings were different. Chewed up the inside of the housing and sent metal throughout my whole system. I yanked the hydraulic fluid box and hot water pressure washed it out. Gas bathed it then washed it again and took a magnet to get every shaving out. Installed brand new filters and put three big magnets in the bottom. It also chewed up my hydraulic motor which was causing my drifting issue. I bought a new swing section and new motor installed it all and ran great for a load. After that it wouldn't turn left very easy at all and when I grabbed a log wouldn't swing at all. Put pressure gauges in line and watched them. Finally I took the swing brake out of the loop and hooked it up direct and was ever so easy on it and it turns both directions easy. So I will rebuild the relief valves on it but when I tried it last night I noticed the stick boom wouldn't extend all the way and was wondering if that had something to do with the internal seals in the swivel. I have a prentice 120c manual and ran across the loss of power section and it was due to the seals being wore in the swivel. Iv been down close to three weeks working on this thing and could use some help. This is my first truck and it has been one thing after another and getting sick of driving to a landing and something going wrong. The pto was rebuilt but I'm sure those shavings going through it didn't help. Replaced all suction hoses and a bunch on the picker. It's still kinda jerky with all the new and I'd like to get it smooth. The only thing I havnt went through is the swivel which was "rebuilt" when I got it and the pto after the shavings went through. Any advice would help thanks guys.

[AlexHart]

My gosh that sounds like a disaster.   I've run this loader for more hours than I can remember and I don't know of anything to say to help.   We used to be able to call the Oliver Store in Maine and those guys were absolutely excellent about diagnosing troubles and now we can't even do that anymore since CAT or whatever bought 'em out. 

I had a situation some years back where all of a sudden the grapple rotate stopped rotating one way with a bang.   Some time later I had a valve off it and found a chunk of metal wedged in the port restricting flow.   Not apples to apples obviously but I wonder if something along those lines has happened to you given that you had metal all through the system.   

Good luck though you've got my sympathy.   Hopefully somebody more savy than me can point you in the right direction.   

[Fulp428]

Thanks man I appreciate it. I have a manual here for that 120c and reading through the loss of power and swing section is cause of wore seals in the swivel.  I'm just at a loss so gunna rebuild the swing brake and swivel and if that don't fix it not sure what I'll do. Can't find an online manual or hardly any parts for this thing on the internet seems prentice is selfish with their parts.

[mike_belben]

When you say swivel do you mean a rotary manifold underneath the swing table or you you mean the swing swivel the grapple hangs from?

[Fulp428]

The rotary manifold. Sorry man don't have a manual so kinda winging it. Well the right manual lol. I ordered a seal kit for the rotary manifold today took it all apart no scuffs or knicks in the spare I had so rebuilding it and going to install it along with a new seal kit on the swing brake I can't remember the correct term for it.

[mike_belben]

No worries.  "Live swivel" and "rotary manifold" are interchangeable terms for that. 

If you had leakage in there itd probably make other functions act up when not called on.   Does the manifold have a case drain back to tank?  I wouldnt expect it to.

[Fulp428]

Only thing is has is the big return to the filters on the bottom. Then what feeds it is the two high pressure lines comming from the pto pump.  Metal flakes arnt good for anything I just know that inside housing is scarred. My parts should be here anytime today my other rotary manifold was good inside but there was a broken seal in it and the guy I got the truck from I helped him swap it out he bought another. That crossover relief valve I do believe is the cause of the not swinging left just not exactly sure what's in there or how to do it. I have a old friend who was a cat hydraulics specialist who's helping me through all this it's hard for him to get around and climb all over it though so he walks me through things and teaches me. Iv pretty much went through it all except the left joystick valve lol. Been a royal pain in the ass and lost many nights of sleep over this deal and getting low on the cash fund to put any more money into it. Thanks for the feed back guys I havnt been into log hualing but a couple months and just been one thing after another. I know nothing about diesel and or hydraulics and why I thought this would be a good idea I'll never know haha. Anything else dirt bikes fourwheelers or gas motors I can tear down and fix in my sleep so this is all new to me.....just wish it was a learning experience on someone else's truck I was helping!

[Fulp428]

Took the crossover relief valve off today to rebuild it. Found a chuck of metal in the check valve and the seals were all chewed up and in backwards. Someone had put it back together wrong. Put all new seals in cleaned it out good and greased the seals before install. Tomarrow will be the rotary manifold. Rolled out a sleeve and torch welded the seam together instead of fighting all the seals down on there just slide them down the sleeve and wala.