L3350DT hydraulic problems

[TheOldHokie]

I will add to what @North Idaho Wolfman said. If the valve appears to be working the next step would be checking for flow and pressure at the valve. Thats where your problem is. Stsrt there and work back, not the other way around.

Dan

 

[whitetiger]

I apologize it is on the left of the steering wheel.

When the lever is to the left of the steering wheel, it is a hydraulic shuttle.
When the lever is on the left fender, it is a mechanical shuttle.

What happens if you turn the steering wheel or raise the loader when the tractor stops moving?

 

[TheOldHokie]

When the lever is to the left of the steering wheel, it is a hydraulic shuttle.
When the lever is on the left fender, it is a mechanical shuttle.

What happens if you turn the steering wheel or raise the loader when the tractor stops moving?

I am curious what you are looking for.

Just looking at the parts disgram it appears the shuttle valve is fed by a prority flow divider. The loader is on the excess circuit?

Dan

 

[North Idaho Wolfman]

I am curious what you are looking for.

Just looking at the parts disgram it appears the shuttle valve is fed by a prority flow divider. The loader is on the excess circuit?

Dan

On these tractors when something is wrong / off it will cause you to lose either the loader / three point function and or PS function.

On my GST when the GST system has an flow issue you will lose PS use.
On a DT with a shuttle issue it will do the same things.

When it's a pump drive or suction issue you can lose both.

It's a simple diagnosis point on these systems to give you some path of what to check.

 

[TheOldHokie]

On these tractors when something is wrong / off it will cause you to lose either the loader / three point function and or PS function.

On my GST when the GST system has an flow issue you will lose PS use.
On a DT with a shuttle issue it will do the same things.

When it's a pump drive or suction issue you can lose both.

It's a simple diagnosis point on these systems to give you some path of what to check.

I understand all that. I am trying to understand what cycling the PS or loader tells you.

That tractor has a tandem pump. One section for PS and a implement/shuttle section with flow divider. Checking flow at in and out of the flow divider is real easy.

Dan

 

[whitetiger]

It's a simple diagnosis point on these systems to give you some path of what to check.

Exactly, it pays off quite often, takes 20 seconds, and you do not have to pick up a wrench before you have a sign of what is causing the erratic operation.

 

[TheOldHokie]

Exactly, it pays off quite often, takes 20 seconds, and you do not have to pick up a wrench before you have a sign of what is causing the erratic operation.

Understood and I wholeheartedly agree.

I asked and he answered way back in posts #6 and #7. According to him the loader is behaving erratically.

I think its time to pick up a wrench. The question is how and where. I suggested the PB line on the loader valve. Hard to tell from browsing the parts listings but it looks like the loader valve contains the primary relief for that half of the system so its an easy and safe test point. Would you agree?

Dan

 

[whitetiger]

Understood and I wholeheartedly agree.

I asked and he answered way back in posts #6 and #7. According to him the loader is behaving erratically.

I think its time to pick up a wrench. The question is how and where. I suggested the PB line on the loader valve. Hard to tell from browsing the parts listings but it looks like the loader valve contains the primary relief for that half of the system so its an easy and safe test point. Would you agree?




I would agree.

Dan

 

[TheOldHokie]

Thanks to @whitetiger for the shop manual pages. That lays out the hydraulic flow and component locations quite clearly. It really would be helpful if the OP would answer whitetiger's PS question

Dan