340 Weak hydraulic flow

[Hilltop Evergreens]

Hello, I am working on a 340 Farmall and the hydraulics seem weak. I put a flow meter into the outlet on the right side and we have about 4 gpm flow with it full flow. When I crank my valve shut, I have about 2 gpm at 750 psi. This one has one pump on the side of the engine and its new. I pulled the whole valve assembly off today and took it apart and cleaned the flow divider spool and everything looks fine. Any more ideas what's going on. When I stand on the lift arms it will lift me but slow. It also has a real whine when the tractor is running. Not sure if that's normal??
The filter is new. Hyd oil is well over full..... I'm a bit frustrated at it because it's so simple yet I can't figure it out. Any help would be greatly appreciated!

 

[Fritz Maurer]

Sounds plugged up on the suction side

 

[dnd]

Hello, I am working on a 340 Farmall and the hydraulics seem weak. I put a flow meter into the outlet on the right side and we have about 4 gpm flow with it full flow. When I crank my valve shut, I have about 2 gpm at 750 psi. This one has one pump on the side of the engine and its new. I pulled the whole valve assembly off today and took it apart and cleaned the flow divider spool and everything looks fine. Any more ideas what's going on. When I stand on the lift arms it will lift me but slow. It also has a real whine when the tractor is running. Not sure if that's normal??
The filter is new. Hyd oil is well over full..... I'm a bit frustrated at it because it's so simple yet I can't figure it out. Any help would be greatly appreciated!

Hi, just wondered were you got the new pump. I need one for mine.

 

[SinkholeRoad]

Check the filter. I know you said you just put in a new filter but check it again. I changed the filter in mine and it acted like it was blocked on suction. Finally I checked the new filter and it was clogged up.
I agree with Fritz, really sounds like suction side.

 

[caterpillar guy]

Suction side or an air leak in there some how.

 

[BarnyardEngineering]

Overfilling the hydraulic oil on these doesn't do anything but waste oil.

 

[Pete7]

Hello, I am working on a 340 Farmall and the hydraulics seem weak. I put a flow meter into the outlet on the right side and we have about 4 gpm flow with it full flow. When I crank my valve shut, I have about 2 gpm at 750 psi. This one has one pump on the side of the engine and its new. I pulled the whole valve assembly off today and took it apart and cleaned the flow divider spool and everything looks fine. Any more ideas what's going on. When I stand on the lift arms it will lift me but slow. It also has a real whine when the tractor is running. Not sure if that's normal??
The filter is new. Hyd oil is well over full..... I'm a bit frustrated at it because it's so simple yet I can't figure it out. Any help would be greatly appreciated!

Hello, I am working on a 340 Farmall and the hydraulics seem weak. I put a flow meter into the outlet on the right side and we have about 4 gpm flow with it full flow. When I crank my valve shut, I have about 2 gpm at 750 psi. This one has one pump on the side of the engine and it’s new. I pulled the whole valve assembly off today and took it apart and cleaned the flow divider spool and everything looks fine. Any more ideas what's going on. When I stand on the lift arms it will lift me but slow. It also has a real whine when the tractor is running. Not sure if that's normal??
The filter is new. Hyd oil is well over full..... I'm a bit frustrated at it because it's so simple yet I can't figure it out. Any help would be greatly appreciated!

Hello, I am working on a 340 Farmall and the hydraulics seem weak. I put a flow meter into the outlet on the right side and we have about 4 gpm flow with it full flow. When I crank my valve shut, I have about 2 gpm at 750 psi. This one has one pump on the side of the engine and its new. I pulled the whole valve assembly off today and took it apart and cleaned the flow divider spool and everything looks fine. Any more ideas what's going on. When I stand on the lift arms it will lift me but slow. It also has a real whine when the tractor is running. Not sure if that's normal??
The filter is new. Hyd oil is well over full..... I'm a bit frustrated at it because it's so simple yet I can't figure it out. Any help would be greatly appreciated!

Hello, I am working on a 340 Farmall and the hydraulics seem weak. I put a flow meter into the outlet on the right side and we have about 4 gpm flow with it full flow. When I crank my valve shut, I have about 2 gpm at 750 psi. This one has one pump on the side of the engine and its new. I pulled the whole valve assembly off today and took it apart and cleaned the flow divider spool and everything looks fine. Any more ideas what's going on. When I stand on the lift arms it will lift me but slow. It also has a real whine when the tractor is running. Not sure if that's normal??
The filter is new. Hyd oil is well over full..... I'm a bit frustrated at it because it's so simple yet I can't figure it out. Any help would be greatly appreciated!

Take look at this info. Best I’ve found on how the 340 hyd system works. I have a 340 also

hydraulic system on 340

I just bought a Farmall 340 with the engine driven hydraulic pump at the timing gear. The hitch lifts strongly--it will lift the tractor off the ground. But when the control is in the neutral position, so the cylinder is not active, the pump is pumping full pressure against a closed system. There...

www.redpowermagazine.com

 

[Hilltop Evergreens]

Hi, just wondered were you got the new pump. I need one for mine.

A&I products

 

[Hilltop Evergreens]

Thank You all for the info .! Gives me a lot to go off

 

[Pete7]

Thank You all for the info .! Gives me a lot to go off

Hope you get it fixed and please let us know when you do. It will help future folks with the issue.

 

[Hilltop Evergreens]

What should the flow be at the outlet? I have not got a good answer from I&T manual and wondering if someone knows

 

[Pete7]

What should the flow be at the outlet? I have not got a good answer from I&T manual and wondering if someone knows

Pic is from a manual on 340 and 460 series tractors. If you can’t zoom on the pic to read it, it says 9 gallons per minute for external pump.

 

[caterpillar guy]

I would expect you would have with a good pump some where around the pump out put level of probably 8-12 GPM at some place in the 1500-2500 PSI when you crank the flow rater down to the specified pressure for the tractor. IF get less than those figures and ar not close to the proper volume and pressure you need a pump or the relief valve is not doing it's job or you have a restriction in the suction side of your line. Other option would be a blown o-ring in the system someplace.

 

[Hilltop Evergreens]

Thanks for all the help. I have a question about the return oil to the transmission. I have a flow meter plugged into the one outlet and pipe the big return line from valve stack and the outlet of the flow meter into a bucket and when I move a hyd lever i have my 4 Gal flow with no pressure like before but it comes out both the big return line and the flow meter outlet about the same speed. Am I thinking correct that the flow back to transmission should stop??? and mainly only come through my flow meter??

 

[Hilltop Evergreens]

Hello, so I got a regulator valve block from a salvage yard that did not have the flow divider and also did not have the outlet going out the end and looping to the top of the hitch valve. This one has a bored hole directly to the next valve on the face with the three O-rings. I capped the power steering off and we have flow now. Something with that thing was goofing me up. Thanks for all the replies and its out my shop door and he's going to try it without power steering.

 

[caterpillar guy]

You need a priority valve for the power steering to work and still use the remotes. Since the easiest route is what the oil will flow to. Another words if the steering takes less pressure to flow through/to then that is where the oil will flow to rather than the remote. The priority valve will force some oil by limited quantity to flow to the steering and the rest will be available to the remotes and will then also lift up to the limits of the relief valve pressure on them. And the steering will also then work as intended this way. We were using an auger on one circuit to filll the planter one year and another auger to put the fertilizer up to the cross auger on the planter. Well once the pile auger got a load on it the auger would stop and the cross auger got the oil flow even though they were on different circuits on the same tractor. So weo had to stop one auger to run the other then restart the first auger till we got it filled that time .Then we used 2 tractors and solved the problem for that year.