B7500 Hydraulics Dead

[TFL]

Thought I’d change the plumbing on my B7500 with 800 hrs. This worked out well - all new fittings, hoses, and fluid. Since then over a period of a week I used it for about 2 hrs.

Today when I started the tractor the hydraulics did not respond. After about a minute of fiddling with the levers for front and back it suddenly kicked in. Worked it for ~ 1/2 hr. Got back to it an hour later and no response again - completely dead hydraulics.

Pump?

 

[freewheel3]

Sounds like you have either an air leak on the suction side of the pump or low oil level.

 

[Dave_eng]

Thought I’d change the plumbing on my B7500 with 800 hrs. This worked out well - all new fittings, hoses, and fluid. Since then over a period of a week I used it for about 2 hrs.

Today when I started the tractor the hydraulics did not respond. After about a minute of fiddling with the levers for front and back it suddenly kicked in. Worked it for ~ 1/2 hr. Got back to it an hour later and no response again - completely dead hydraulics.

Pump?

Your story is a regular one on the forum. Hoses being changed and the process not being done one at a time and then a hose, now two, in the wrong place and eractic operation begins

Need more details re your tractor.

Transmission type?

Do you have a loader?

I am guessing you have a hydraulic block outlet type that supplies power to your loader but you could have a selector valve setup..

If you have the outlet type block, usually owners get into trouble by putting a new hose into the wrong place.

You have to have posted 5 times to put up a photo.

Reply to my questions in two posts to build up your count and then try postiing a photo of your tractor and the critical valves and blocks..

Make up a sketch showing which hose goes where.

Dave

 

[TFL]

Your story is a regular one on the forum. Hoses being changed and the process not being done one at a time and then a hose, now two, in the wrong place and eractic operation begins

Need more details re your tractor.

Transmission type?

Do you have a loader?

I am guessing you have a hydraulic block outlet type that supplies power to your loader but you could have a selector valve setup..

If you have the outlet type block, usually owners get into trouble by putting a new hose into the wrong place.

You have to have posted 5 times to put up a photo.

Reply to my questions in two posts to build up your count and then try postiing a photo of your tractor and the critical valves and blocks..

Make up a sketch showing which hose goes where.

Dave

Thanks Dave! I’ll get to it!

 

[TFL]

Sounds like you have either an air leak on the suction side of the pump or low oil level.

There was a fitting that I did not properly tighten on the belly. It squirted out plenty of fluid when lifting the rear. Added an approximate amount of fluid to replace what was displaced after tightening.

 

[TFL]

Transmission type? Gear

Do you have a loader? Yes. Woods #1006.

I am guessing you have a hydraulic block outlet type that supplies power to your loader but you could have a selector valve setup. Hydraulic block.

If you have the outlet type block, usually owners get into trouble by putting a new hose into the wrong place. Yep. Did that. Half dozen combinations until I got it right.

 

[Dave_eng]

Transmission type? Gear

Do you have a loader? Yes. Woods #1006.

I am guessing you have a hydraulic block outlet type that supplies power to your loader but you could have a selector valve setup. Hydraulic block.

If you have the outlet type block, usually owners get into trouble by putting a new hose into the wrong place. Yep. Did that. Half dozen combinations until I got it right.

Are you saying the problem is solved?

Dave

 

[TFL]

Are you saying the problem is solved?

Dave

Dave - No. I’ll follow up with this thread tomorrow with pics.

 

[TFL]

Dave - No. I’ll follow up with this thread tomorrow with pics.

Can zoom in on the valve upper left

 

[Dave_eng]

Can zoom in on the valve upper left

How many lines connect to the loader valve. 6 or 7?

Does your tractor have power steering?

Does your tractor have a hydraulic block which looks like the one below?

Dave

 

[TFL]

7
Yes
B

 

[TFL]

7
Yes
B

To all who have helped me figure this out - Got it working. Thank you for your direction and time. Learned a lot and that’s a good thing. Much appreciated.

 

[torch]

What did it turn out to be?

 

[TFL]

What did it turn out to be?

Kinda embarrassed to say - The loose fitting lost much more fluid than I had thought. Initial dipstick read came out wet so I had checked that off the troubleshooting list. Today I decided to check it again. Didn’t even touch the fluid. Guess I got to stop rushing through troubleshooting.

Don’t do too much mechanical work but believe DIY. From beginning to end of hose replacement learned some stuff for sure

 

[torch]

Don't be embarrassed. Everybody makes mistakes. The man who doesn't make mistakes is either lying or dead. The trick is to make a new mistake next time. ;-)

My first rule of troubleshooting is to check the simplest and easiest possibilities first, because A) they don't take much time or expense and B) they are usually the problem.

(When establishing the list of possibilities, my first question is "What did I do or touch just before it quit working?" )