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hydraulic lift problem Ford LGT 165 Close Sided


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#1 FilledTires OFFLINE  

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Posted January 10, 2015 - 11:22 AM

Hi Everyone,

 

So I have encountered an issue with the hydraulic lift on the Ford LGT 165 I am rebuilding.

 

The hydraulic lift works very slow and can't lift the lift carriage past a few inches. The transmission powers the trans axle with no problem. The problem is isolated to the lift circuits.

 

I replaced the lift valve entirely with one from a working tractor to eliminate that as a possibility.

 

I have also checked the cylinder for internal leaks by disconnecting one hose from the control valve, running the tractor and working the cylinder by the remaining connected hose and checking for oil leaking past internal seals. No internal cylinder leaks detected.

 

I have checked the input steel hydr. lines for heat to determine if there is a blockage somewhere. None detected.

 

I really don't want to dis-assemble the eaton hydraulic pump if I don't have to. 

 

I have not done an actual pressure test but I have a pressure gauge being shipped to me. The symptoms of the Lift Cylinder not lifting any weight and operating slowly indicates a low pressure situation, but I have not detected any leaks or blockages anywhere.

 

 

Is there any troubleshooting step I have missed?

 

If the hydro drives the transmission fine, does that mean it should in theory provide enough flow and pressure for the lift circuit?

 

Thanks for your thoughts,

 

- FT

 

 

 



#2 tater195 OFFLINE  

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Posted January 10, 2015 - 12:26 PM

It sounds like you have a high pressure relief stuck open
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#3 crittersf1 OFFLINE  

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Posted January 10, 2015 - 12:28 PM

What ^^^^ he ^^^^ said.



#4 boyscout862 ONLINE  

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Posted January 10, 2015 - 12:30 PM

Have you checked in our Manuals Section for the correct manual? It should have a troubleshooting guide. I would suspect a flexible hose is deterriorated inside, seen it before. Check all lines and the relief valve before even thinking about the pump. Good Luck, Rick


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#5 FilledTires OFFLINE  

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Posted January 10, 2015 - 02:55 PM

The only relief valve is in the control valve correct?

#6 Bmerf OFFLINE  

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Posted January 10, 2015 - 03:46 PM

This might sound like a stupid question, but how is the linkage? I've seen equipment where the linkage is worn so that it barely moves the control valve. Not familiar with this setup, but a little slop here, a little slop there, adds up to barely moving the valve in and out. Worth a check. If not worn, I'd look at all the hoses/lines next. 


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#7 FilledTires OFFLINE  

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Posted January 10, 2015 - 05:23 PM

Good Point. I am going back to the cold garage to check out all these ideas.



#8 skyrydr2 OFFLINE  

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Posted January 10, 2015 - 05:48 PM

There are 2 reliefs one for the hydro and one on the lift valve. It sounds to me like your charge pump may be messed up. The hydro will work with out the charge pump but not the greatest.

#9 FilledTires OFFLINE  

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Posted January 10, 2015 - 06:52 PM

Lol. Well I am an idiot and missed the most obvious reason for a un-responsive hydraulic system...You ready? 10 Degree Temperatures.

 

On my last post I mentioned going back to the cold garage. I have a heater in there but it only brings it up to 30 degrees.

 

I let the engine warm up the transmission and voila. Lift works great.

 

Feel free to ridicule me! =)


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#10 Bmerf OFFLINE  

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Posted January 10, 2015 - 06:59 PM

Been there, done that. Usually it's the simple things that get us. :rolling:



#11 FilledTires OFFLINE  

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Posted January 10, 2015 - 11:50 PM

It's alive!

 

2015-01-10 21.35.21.jpg


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#12 KennyP ONLINE  

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Posted January 11, 2015 - 05:39 AM

Glad it was a simple issue! And something not normally thought of!






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