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lift trouble


 
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chuck s..
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PostPosted: Sat Jul 07, 2007 5:13 am    Post subject: lift trouble Reply to specific post Reply with quote

ok,got tbl. with lift on 52 n......check fluid is ok and no leaks at the piston ram and nothing else i could tell.....only got about 475 psi with pressure gauge....what do i check next....lift will pick up my boom pole,but nothing heavier than that...thanks for help
 
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Dan
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Joined: 12 Jan 1998
Posts: 12109
Location: Garland, Texas

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PostPosted: Sat Jul 07, 2007 5:25 am    Post subject: Re: lift trouble Reply to specific post Reply with quote

Sounds like the safety valve is gone and popping when minimal weight is put on the system. When you are trying to lift a heavy object, do you see a lot of swiriling around the base of the pump towards the back of the tractor? If so, time to replace the safety valve.

Dan
 
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OH Boy
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Joined: 03 Sep 2002
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PostPosted: Sat Jul 07, 2007 5:26 am    Post subject: Re: lift trouble Reply to specific post Reply with quote

Have you changed the hydraulic fluid recently? It might just be gunk/debris stuck in the pump, control valve or pressure relief valve somewhere.

Pull the inspection covers off, start the tractor up, engage the PTO and look for any obvious leaks inside the pump housing. If you find fluid leaking somewhere or big swirls behind the pump, check back and describe it so the guys here can help you determine exactly what needs repaired.
 
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chuck s..
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PostPosted: Sat Jul 07, 2007 6:59 am    Post subject: Re: lift trouble Reply to specific post Reply with quote

yes dan that is exactly what i see with a heavy load on it,will u recommend what i should do next...thanks alot for your expertise
 
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Dan
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PostPosted: Sat Jul 07, 2007 9:59 am    Post subject: Re: lift trouble Reply to specific post Reply with quote

It has been said that you can cut a wrench in half so it is real stubby and remove this saftey valve from the inspection cover. Here is a quote from our resident hydraulics guru Zane Sherman:

"You can replace the relief valve by removing the inspection plate from the left side where the PTO shifte is and bending an 11/16" boxed end wrench in a 45% so it can reach under the PTO so you can turn the valve. I have replaced probably a hundred this way. I personally had rather take a beating than drop the pump. It is a messy and difficult job. Have to drain the oil, remove the PTO, remove the right hand inspection plate and have to have at least two people to re install it because one will have to do the fitting it up through the bottom and the other will have to guide the contro valve into the eyelet in the pump. All this with oil dripping in your eyes etc. "


I just replaced mine when I rebuilt my pump. Either way, this should fix your problem.

Good luck,
Dan
 
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chuck s..
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PostPosted: Sat Jul 07, 2007 11:30 am    Post subject: Re: lift trouble Reply to specific post Reply with quote

ok i guess i need to replace the relief value...im guessing it is on the backside of the pump.....is it easier just to take the top off and try to do it ?
 
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Dan
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Location: Garland, Texas

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PostPosted: Sat Jul 07, 2007 12:09 pm    Post subject: Re: lift trouble Reply to specific post Reply with quote

Not sure - like I said, the times I have replaced saftey relief valves was when I already pulled the pump. I guess in theory I would think that would make it a tad easier.

Dan
 
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dlplost
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Joined: 24 May 2006
Posts: 925
Location: Painted Post, NY

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PostPosted: Sat Jul 07, 2007 12:19 pm    Post subject: Re: lift trouble Reply to specific post Reply with quote

easyest way is to park with the front end down in a ditch. (makes the tranny fluid run up foreward, so it wont leak out the PTO.) Remove 4 bolts on PTO shaft and remove it. then go in thru one of the side plates to remove the valve. It's located on the center of the back of the pump directly below the PTO shaft.
 
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chuck s..
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PostPosted: Sat Jul 07, 2007 1:00 pm    Post subject: Re: lift trouble Reply to specific post Reply with quote

ok im going to order a value....im going to wait till it comes and and take the top off,,,gotta be easier....dropping that pump is the nastiest thing in the world......thanks for your help and i will post back when i put it in
 
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chuck s..
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PostPosted: Sun Jul 08, 2007 6:28 am    Post subject: Re: lift trouble Reply to specific post Reply with quote

thanks, i will do that....got part ordered ...thanks for suggestion
 
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