3 point and remote weak

[Donnyncarol]

Ok, hopefully someone here will know what's up with this Montana/ LG/ agracat 4740lx. New hydraulic pump, new filters. I replaced the hydraulic pump because no was running a 3pt backhoe probably 10 years ago and well.... It was way to much for this little tractor. I bought bit new as a 50 horse, wasn't until the first oil change I did on it I found out it is a 40. Anyway, the hydraulic pump kept getting weaker and weaker So I finally broke down a replaced it. Everything seemed to be working fine. Fast forward a few months, it's hay season and I put on the cutter. I have to rev the engine to 2800 RPM or more for the 3 point to lift it. When I try to raise the cutter bar with the remote same result. The load works fine with plenty of power. Also I can hear fluid passing through the hoses on the loader valve. Any thoughts? Thanks in advance

 

[Donnyncarol]

Maybe to add this is an LG cable tractor, Montana says it was made before they purchased the company, but they sell parts as a 4340, and a 4940. But the parts come from LS as a LS Neo47. Confused. Me too..

 

[ptsg]

Did you clean the strainer/screen for the hydraulic pumps on the transmission?

 

[Donnyncarol]

New filter new oil. Not aware of a screen anywhere. Thank you for the reply

 

[ptsg]

Since you mention the loader works just fine, my guess is that the lines from the loader valve that will feed the 3 pt and remotes may be messed up.

What happens if you move the lever for the 3 pt to lift, then you move the joystick of the loader till the cylinders reach the end of the stroke? If the 3 pt will then lift, then the lines are not connected right.

 

[Donnyncarol]

Ugh I tried to change a typo and the whole new explanation of what I have done got deleted. Lesson learned. Typo or not leave it alone

 

[Donnyncarol]

I have not tried that. But the plumbing is factory. But I will go out and try it. But inside not sure if I can reach full lift on the loader. But I will attempt to.

 

[ptsg]

Use the curl/dump instead of the loader lift.

 

[Donnyncarol]

Ok by making the curl go-to end of stroke I can get a pressure reading to the rear remote of 700 PSI. But it took repeatedly hitting end of stroke and it would jump about 100 PSI each time to a Max of 700 psi. When the curl was traveling it would stop the lift of the 3 point. When I released the curl it would resume to move slowly.

 

[ptsg]

I'm very suspicious of the plumbing of the tractor hydraulic system but without a hydraulic diagram, it's very hard to give valid advice.